DCPIV User manual
Contents
1. Figure 4 13 Frame grabber information tabs e Use analog input When the analog input is not needed disable the input by removing the check mark from the box Use analog input e Max number of analog samples Below the check box Use analog input the maximum number of analogue samples appears This number which depends on the onboard memory size and the Sample delay range setting shows how many waveforms the board can hold Installation and User s guide for DC Image Acquisition System 4 9 Trigger settings Channel 1 settings Channel 2 settings When the user specifies a number of records that exceeds the max number of analog samples only the first max number of analog samples will contain analog data e Sample delay range in the bottom of the dialog This input has two functions 1 The user specifies the delay from the trigger to the analog values that are saved with image data 2 This setting specifies the length of the waveform in time The range is from 0 1 us up to 1 ms e Trigger select The trigger input of the CompuScope board is edge sensitive It is possible to specify if it is a positive edge or a negative edge that triggers the acquisition e Level Together with specifying the trigger polarity a voltage must be specified The range is from 5 0V to 5 0V e Range Specify here the input voltage range for channel A e Coupling This input is used to specify if the input coupling i2. FIY 1100 Options Window Help FlowMap 1500 FIY 2100 PIY 200 No Hardware Connection FlowMap 2500 Verify Setup Parameters ir P FlowMap System Hub system Unit IP Address Time Resolved Imaging System Unit reel Le Direct Computing Imaging Mane Figure 4 4 Selecting the DC System among the many acquisition systems available from Dantec Dynamics A S e Press then the green Run online icon on the tool bar to enter the online acquisition part FlowManager C Program Files Dantec Dynamics FlowManager Libs DC PIV fdb File Edit View Setup Run Analysis Options Window Help P OskhG aeaxxr DEDICAS P MP i 8 liga gg T H amp Besa o amp Database DC PIV 5 pc PIv E Direct Current PIY Figure 4 5 FlowManager main window with iconised shortcuts to direct set up and image acquisition start Installation and User s guide for DC Image Acquisition System 4 2 Online acquisition window Note 4 3 Project 1 E BA ot A DCImg 1 Flow hat o T1 View control 2 ii a uer TTL Lose it udis tor PO e o gt gt yx lt gt Edi i al 10 I I Image size 1344x1024 0 0 12 bits image B Burst rec 1 1 1 Date 24 02 2003 Time 15 24 41 000 300 400 5 n 600 Too 500 300 woo 1100 Tz tpix 130 When the Run online icon 9 is pressed a new DC Image Acquisition dialog box is displayed containing the follo
3. and Interfaces Among many PCI devices the PCI 6601 device and 1 or 2 IMAQ PCI 1428 devices should be present Click on PCI 6601 Device number should have the value 1 Click on Tools gt IMAQ gt Max number of buffer and set the value to 1000 Press the Ok button Exit MAX utility software 3 2 3 Analog Input software and hardware installation For installing an analog to digital board in you PC please refer to the manual and Driver Installation Guide enclosed with the board 3 2 4 DC Image Acquisition Software installation Software installation comprises installation of the DC software and device drivers for controls over the hardware used 1 Install FlowManager software package Switch on the computer and insert the FlowMap CD ROM delivered by Dantec Dynamics in the CD drive Select Install FlowManager from the menu displayed and follow the instructions given during installation 2 Install the DC Imaging System software and device drivers for the frame grabbers From the FlowMap CD select Install DC Imaging add on and click on Install DC Imaging add on This will install the device driver patch for the NI IMAQ driver and additional files needed for the DC Image Acquisition software e Reboot the PC Note It is important that the version number of the FlowManager software matches the version number of the DC Imaging System software If not the installation will not succeed Note Not
4. software and install the DC Image Acquisition software and the NI DAQ driver again Problem You cannot change settings in the timing setup even 1f no data belong to the current setup Solution Exit the online acquisition part and enter again It can be because you have deleted images which belong to the currrent setup while you were in the online acquisition part Problem No image on either frame A or frame B Solution Check the cable connecting the Timer Box and the synchronisation board in the PC Installation and User s guide for DC Image Acquisition System 5 6 Technical specifications Number of cameras Image acquisition rate Camera supported Trigger mode Laser shutter trigger Records to acquire System memory Operating system 1 or 2 Camera dependent HiSense MkII HiSense 4M FlowSense 2M Internal timer or external trigger TTL level Depending on number of cameras and available system memory Up to 2 GBytes limited by the Windows operating system Windows 2000 XP Installation and User s guide for DC Image Acquisition System
5. 3 Z2 Pal Acquisition COn mbH MA MEM M 4 3 Image ae QUISO SAA 4 4 VEO e ala pets eto LU lo 4 6 A 4 7 Installation and User s guide for DC Image Acquisition System 1 11 4222 NOB WT IRIS 10 E NR PCE E REO A N 4 7 Trigserconttol related Paramete ES oe EIN NU NEN VIENNE EM ee 4 7 4 2 3 Frame grabber settings Tabs FG1 Info and FG2 Info occcccccncncnnnnnnnnnnnnnnnnnnononnnnnonnnnnnnnos 4 8 AZA o os e HH 4 9 AD SEtUp COMO a 4 9 AEE A e AE OA PO A o ELA D TM EM ID M UU ECL E 4 10 Channel ME Sila M TTE 4 10 Channel 2S CLG Sessa metus n E tm mates utem M DEM DEI E D E M I mU EE I MUEE 4 10 425 AMES ae TUHG OD un tieu tud Grata at oaa tet is A 4 10 TEOUDICSNOOUING aii leia rece UI OU reve QEV VIDE CR LY DO EIOS TEN be DE a ERAN V IU VE e I DEL SNP RR ODUE 5 1 RS A O 6 1 Installation and User s guide for DC Image Acquisition System 1 Warranties amp disclaims 1 1 Dantec Dynamics License Agreement This License Agreement is concluded between you either an individual or a corporate entity and Dantec Dynamics A S Dantec Please read all terms and conditions of this License Agreement before opening the disk package When you break the seal of the software package and or use the software enclosed you agree to be bound by the terms of this License Agreement 1 1 1 Grant of License This License Agreement permits you to use one copy of the Dantec software product supplied to you the Software includin
6. DG Image Acquisition System Installation amp User s guide This user s guide may not be copied photocopied translated modified or reduced to any electronic medium or machine readable form in whole or in part without the prior written consent of Dantec Dynamics A S Publication no 9040U4164 Date July 1 2004 3 edition printed in 2004 O 2004 by Dantec Dynamics A S Tonsbakken 16 18 DK 2740 Skovlunde Denmark All rights reserved All trademarks referred to in this document are registered by their owners Table of contents La oasis 1 is Warranties GIS Clan ai CER Doe EE DR REUS 1 1 LI Dantec Dynamics License Agreement ais Stu A tui dc Uds 1 1 HEL Eramos e e a a e e aS oe 1 1 e NE A A MERC TEE EEA E 1 1 LLS QOCODVPIS E 5 ioi iie Da aes pem ica eu iit e Ducem ua nien eden ae parc M eI 1 1 la Cimeo V GEEOU Ao 1 1 LES EAN IA MI MEM DAE D eM seen 1 2 alz Product abla ee e dts medius e MEM ee MEE MELLE 1 2 Ihe Govemine Law and Proper AAA t e rte aee nenne ere ena attt 1 2 ESE A A ete tes atta Detur fq amd redde 1 3 po SPI Ci Aa 1 3 TS OS CAS DE WATER PH 1 3 2 DGC Image Acquisition SC a a SVO Eaa 2 1 AS SDV CPV I CW E A E A RERO cc cece ch Tis ecko ete ee ee ze 2 2 Cameras supported by the DC Imaging System sse AEE nes nsns nnn nnn 2 1 2 2 AS nto corteo Oba eee ERR a e oe cete eto t eros 2 1 2 2 2 PDlowsense 2M Can e A IR rete EN eene cedit e eto e den dE REA RM UR 2 2 2 2298 A O o diets ot
7. a shutter device may be used This shutter can be used together with a continuous wave laser and the trigger signals from the synchronisation part of the DC Imaging System can be employed to open the shutter and keep it open for a specified period of time Installation and User s guide for DC Image Acquisition System 3 Installation 3 1 Unpacking the system The DC Image Acquisition System comprises e frame grabber for each camera package delivered with the DC System also includes a CD ROM with drivers installation software from National Instruments e lor2 two cameras with power supply e synchronisation board e timer box including a 1 m long connection cable for connecting to the synchronisation board and 5 10 m cables for connecting to a laser e data interface cable 10 m for each camera e 1 trigger cable 10 m for each camera e FlowMap CD ROM with the installation software for FlowMap DC and FlowManager data analysis software Note The frame grabber s and the synchronisation board must be installed in the same computer as the FlowManager software If the computer is part of the delivery the installation has already been done and do not require any further software installation In this case you may go directly to section 4 4 otherwise please read carefully all Section 3 of this document Note To use Dantec Dynamics DC Imaging System you need an illumination system like a double cavity laser with light
8. by the available memory in the PC Below the Initialize Acquire button a status line shows the storage capacity in terms of maximum records and MBytes space If the user enter say 250 records when the system only can store 150 images the software automatically correct the value typed in the Records to acquired dialog and replaces it by the maximum available Additionally the total time the acquisition will take in seconds is given The latter depends on the trigger frequency when the Internal master clock triggering mode is used and it is set to zero when the External sync mode is used since the trigger frequency is not known e Start laser button Pressing the Start laser button immediately starts the laser which flashes at the Trigger frequency specified in the Tab Timing setup Note that this is also a way to get the laser stabilised before record acquisition which is a critical issue when e g running LIF experiments When the trigger mode is set to External sync the laser flashes each time the external trigger signal is received by the timer box Installation and User s guide for DC Image Acquisition System Note In any synchronisation case no images are recorded until the Show preview or the Initialize Acquire buttons are pressed e Show preview button The Show preview button offers the possobility to acquire images without saving the data in
9. e that when installing new software on your PC you need to have administrative rights 3 2 5 Uninstall the DC Image Acquisition software If you need to run FlowManager software without support for the DC Image Acquisition software please follow the next procedure Select Start gt Settings gt Control panel and select Add Remove programs Select DC Image Acquisition and click on the Remove button Select then FlowManager and click on Change gt Next Repair Next gt Install to repair FlowManager software Installation and User s guide for DC Image Acquisition System Now the DC part has been removed and FlowManager will operate as in the original installation 3 3 Connections 3 3 1 Steps by steps procedure Before utilisation of the DC system all parts must be properly connected Always turn off the power of the PC while hardware connections are made On all cameras there is a DIP switch For the HiSense MKII AM camera verify that all four pins are in the lower position i e off position For the FlowSense camera all pins must be in the left position Connect the camera Digital I O connector to the frame grabber Camera link connector using the 10 meter data cable The other connector on the frame grabber is not used Connect the synchronisation board to the Timer Box using the Im interface cable Timer laser box camera s connections Connect the connector marked Ou
10. each other Dantec shall be entitled to remedy any defect by indicating procedures methods or uses work arounds which result in the defect not having a significant effect on the use of the Software The Software was tested prior to delivery to you However software 1s inherently complex and the possibility remains that the Software contains bugs defects and inexpediences which are not covered by the warranty set out immediately above Such bugs etc shall not constitute due ground for termination and shall not entitle you to any remedial action Dantec will endeavour to correct all bugs etc in subsequent releases of the Software The Software is licensed as is and without any warranty obligation to take remedial action or the like thereof in the event of breach other than as stipulated above It 1s therefore not warranted that the operation of the Software will be without interruptions free of defects or that defects can or will be remedied 1 1 5 Limitation of Liability Neither Dantec nor its distributors shall be liable for any indirect damages including without limitation loss of profits or any incidental special or other consequential damages even if Dantec is informed of their possibility In no event shall Dantec s total liability here under exceed the License fee paid by you for the Software 1 1 6 Product Liability Dantec shall be liable for injury to persons or damage to objects caused by the Software in accordance wit
11. g documentation in written or electronic form The Software is licensed for use on a single computer and or electronic signal processor and use on any additional computer and or electronic signal processor requires the purchase of one or more additional License s The Software s component parts may not be separated for use on more than one computer or more than one electronic signal processor at any time The primary user of the computer on which the Software is installed may also use the Software on a portable or home computer This License is your proof of License to exercise the rights herein and must be retained by you You may not rent or lease the Software 1 1 2 Upgrades This License Agreement shall apply to any and all upgrades new releases bug fixes etc of the Software which are supplied to you Any such upgrade etc may be used only in conjunction with the version of the Software you have already installed unless such upgrade etc replaces that former version in its entirety and such former version 1s destroyed 1 1 3 Copyright The Software including text illustrations and images incorporated into the Software and all proprietary rights therein are owned by Dantec or Dantec s suppliers and are protected by the Danish Copyright Act and applicable international law You may not reverse assemble decompile or otherwise modify the Software except to the extent specifically permitted by applicable law without the possibility of c
12. h those rules of the Danish Product Liability Act which cannot be contractually waived Dantec disclaims any liability in excess thereof 1 1 7 Governing Law and Proper Forum This License Agreement shall be governed by and construed in accordance with Danish law The sole and proper forum for the settlement of disputes here under shall be The Maritime and Commercial Court of Copenhagen So og Handelsretten 1 K benhavn Installation and User s guide for DC Image Acquisition System 1 1 8 Questions Should you have any questions concerning this License Agreement or should you have any questions relating to the installation or operation of the Software please contact the authorised Dantec distributor serving your country You can find a list of current Dantec distributors on our web site www dantecdynamics com Dantec Dynamics A S Tonsbakken 16 18 DK 2740 Skovlunde Denmark Tel 45 44 57 80 00 Fax 45 44 57 80 01 Web site http www dantecdynamics com 1 2 Laser safety To make for example PIV measurements often requires argon ion or Nd YAG lasers which are classified as Class 4 radiation hazards This document is concerned with the DCPIV solution and there are NO direct instructions in this document regarding laser use and or laser safety Therefore before connecting any laser system you must consult the laser safety section of the laser and other illumination system components Furthermore you must investigate approp
13. mic range is a valuable flexibility in the practical performance of the PIV and LIF experiments although most PIV experiments do not require 12 bit resolution LIF does in terms of scalar resolution precision and accuracy in some cases Also there is less need to adjust the laser power and the seeding simply Installation and User s guide for DC Image Acquisition System 2 1 because a wider range of input intensity levels provide successful results Likewise if problematic windows dirt or other produces uneven illumination over the area there is less loss of local information because the signal is still received at the CCD due to the higher dynamic range 2 2 2 FlowSense 2M camera The FlowSense 2M camera uses a high performance progressive scan interline CCD chip but with lower performance than the HiSense MkII camera approx 75 at 532nm and approx 60 in the yellow orange region of the light spectrum Though the chip includes a much larger number of storage cells with 1600 by 1186 light sensitive cells which greatly limits the performance of LIF results in terms of precision of the scalar property measured In relation to PIV experiments the FlowSense 2M camera has the benefits to record in 8 or 10 bit data resolution high light sensitivity at 532nm about 75 of the HiSense MkII and low background noise The 8 or 10 bit dynamic range is a valuable flexibility in the practical performance of the experiment 2 2 3 HiSense 4M came
14. n and all subsequent records are shown at a rate of approx 1 Hz e Scrolling Records can also be viewed by clicking with the mouse cursor on the scrolling bar and moving the mouse cursor towards the right next record or the left previous record Installation and User s guide for DC Image Acquisition System Storage control To save the images stored in the PC memory to FlowManager database environment specify which images to save using the From and To input fields or check the Save all Press then the Save in database button which will start the transfer of the records selected from the system memory to the database and the harddisk A status line will appear and show the progress and time left to finish the transfer process If needed the user may stop this transfer by pressing the Stop transfer button Transfer images to database From 1 EX ta 1 E Iw Save all Records 1 Save in database Figure 4 10 Storage control window 4 2 2 Tab Timing Setup Select the Timing Setup to specify the timing parameters to run during image acquisition Figure 4 11 Note that it is important that the correct timing parameters are specified to achieve proper results Acquisition Control Timing Setup FG 1 Info FG 2 Info Trigger Trigger mode Internal master clock wi Trigaer Frequency 5 00 Hz Trigger Delay 94 usec 7 dt 80 00 usec 5 Figure 4 11 Timing con
15. n see Figure a below Start Acquisition Start Acquisition E 2 The laser is not started Do you want to start the laser now and continue with the acquisition aa Begin Acqusitian iL MET a Warning message when the laser is not started b Start acquisition window Figure 4 8 Dialog boxes when starting measurements Important tip It can take 30 seconds and more to initialise the memory depending on the number of images to be recorded During that period of time 1f the Start laser has been pressed the laser flashes For the safety of the operator 1t may be adequate not to press the Start laser button When the Initialize Acquire button 1s pressed without the laser flashing a dialog box pups up to inform the user to start the laser That way the laser flashes only during acquisition and not during the initialisation period Installation and User s guide for DC Image Acquisition System 4 5 View control The Acquire images button now changes text and functionality to a Stop Acquisition button Acquisition will run until the specified number of images to acquire is reached or when the user presses the Stop Acquisition button Note that during the acquisition a status line shows the progress and time left to finish acquistion process When the acquisition has ended the records are stored temporarily in to the PC memory until the Clear memory button is pressed or on retu
16. nd User s guide for DC Image Acquisition System 1 3 Precautions 1 Cap the lens whenever the camera is not in use 2 Cap the lens during set up and alignment of the light sheet Before removing the cap make sure that reflections off the surface of any objects inside the light sheet do not hit the lens by observing where reflections go 3 As general precautions to avoid eye damage carefully shield any reflections so that they do not exit from the measurement area You must wear appropriate laser safety goggles during laser alignment and operation Installation and User s guide for DC Image Acquisition System 2 DC Image Acquisition System 2 1 Overview The DC Image Acquisition System comprises the FlowManager software with a special on line image acquisition section In the section the acquisition system can be configured with the desired parameter settings and data can be acquired pre viewed and saved to disk at the operator needs A comprehensive number of data processing methods are available for analysing the data after the acquisition has been made and the data are saved to disk Note that the acquisition hardware used to control the camera and illumination system typically a laser hardware synchronisation and data acquisition transfer must be installed in the same PC as the FlowManager software The system can be configured for either one channel i e using one camera or two channels using two cameras of the same t
17. nnection will not open until the end of the dump Note The cable from the Laser connector on the Timer box fits into the Interlock connector of e g the New Wave Solo PIV laser provided with the DC Image Acquisition System You can check that by entering the online acquisition part The interlock then opens and it stays open until you return to the FlowManager main part again If this 1s not the case check that the connection between the Timer box and the laser interlock control is established Installation and User s guide for DC Image Acquisition System 4 11 9 Troubleshooting Problem The very first time images are acquired after the camera is powered on the frames A and B may be switched Solution Stop the acquisition preview and the image sequence will be correct in the following acquisitions Problem A timeout error is received Solution Turn off the power for the camera and on again Problem When using trigger mode External sync the first image received may be exposed at a wrong moment before or after the laser pulse Solution If possible begin the acquisition before the external trigger source is activated Problem If you cannot select the DC System in the the emnu Options System Unit Type it may be due to conflicts between the installed drivers and old drivers of the NI IMAQ or NI DAQ type Solution Uninstall the DC software the NI DAQ driver and the NI IMAQ driver Repair the FlowManager
18. oblems during the detection of the system Rebooting the PC very often fix this problem The camera s is are always set to double frame mode full pixel resolution and 12 or 10 bit for the HiSense MkII 4M and FlowSense 2M respectively Note that no camera settings can be changed from the software Direct Computing Image Acquisition Acquisition Control Timing Setup FG 1 Info FG 2 Info Frame Grabber information Interface Type Mational Instruments PCI 1428 Serial no D89D61 Onboard Memory 16 MB Figure 4 12 Frame grabber information tabs Installation and User s guide for DC Image Acquisition System 4 2 4 A D Setup A D Setup control If an analog to digital board is installed in the system analog data can be acquired and saved as analog waveforms together with the images Note there is is not much difference from setting up an ordinary digital oscilloscope and to setup the DC Imaging Analog input as shown in the following The property page for the A D Setup Tab can be seen in figure 4 13 Direct Computing Image Acquisition amp cquisition Control Timing Setup Fa 1 Info AlO Setup A D board Information Interface Type A D board MiA MiA Driver Version MIA Memory depth in samples MA Max number of analogue samples O Trigger select Level Range y Channel 1 Coupling Attenuatian Channel Enable nue Y Channel 2 Range Coupling Attenuation Sample delay frange
19. ontractual waiver You are not entitled to copy the Software or any part thereof However you may either a make a copy of the Software solely for backup or archival purposes or b transfer the Software to a single hard disk provided you keep the original solely for backup purposes You may not copy the Users Guide accompanying the Software nor print copies of any user documentation provided in on line or electronic form without Dantec s prior written permission 1 1 4 Limited Warranty You are obliged to examine and test the Software immediately upon your receipt thereof Until 30 days after delivery of the Software Dantec will deliver a new copy of the Software if the medium on which the Software was supplied e g a diskette or a CD ROM is not legible Installation and User s guide for DC Image Acquisition System 1 1 A defect in the Software shall be regarded as material only if it has an effect on the proper functioning of the Software as a whole or 1f 1t prevents operation of the Software If until 90 days after the delivery of the Software 1t 1s established that there 1s a material defect in the Software Dantec shall at Dantec s discretion either deliver a new version of the Software without the material defect or remedy the defect free of charge or terminate this License Agreement and repay the License fee received against the return of the Software In any of these events the parties shall have no further claims against
20. ra The HiSense 4M camera uses a high performance progressive scan interline CCD with a higher resolution than the HiSense MkII and FlowSense 2M cameras but lower sensitivity to green lights when operating in full resolution mode approx 55 50 at 532nm and approx 45 30 in the yellow orange region of the light spectrum Pixel binning 2x2 possibility is available as well to gain in sensitivity The camera resolution is 2048 by 2048 light sensitive cells and an equal number of storage cells It runs with 12 bit resolution and re sampled upper 8 bit resolution to gain space on the harddisk Note the latter settings do not enhance the framing rate 2 3 Illumination systems Note Many methods of producing stroboscopic light sheets are supported by the DC Imaging System pulsed lasers continuous wave lasers and electro optical shutters are some typical examples The DC Imaging System has the capability of supporting pulsed laser or a shutter device combined with a continuous laser system 2 3 1 New wave solo pulsed lasers The synchronisation part of the DC Imaging System controls the generation of trigger pulses Two trigger pulses are generated for each laser cavity to fire a light pulse see Sections 3 amp 4 of this document A fail safe system is further built in to the software to secure the interlock will close in case of a system failure see Section 4 of this manual 2 3 2 Shutter device Instead of a pulsed laser
21. ra acento teeta es i Ea ER 2 2 20 MUNI SySIOMIS e ais 2 27 Do New wave solo pulsed lasers 5 eor rr eda vm Uie i ee ei dea uvem Du dis a UM 2 2 2 29 25 BUCO IC VIC 6 beu teu ten itus otbedess e Mun Cer TL OA M ee EE ED E EA n CES 2 2 Be nS Ca AO LORS 3 1 Del COPA CANE te SV SUI ssi cea acc I eh e ela a an etc 3 1 322 99 VS Ten ins tO AAA Ru LUE Mu I MUI Salo seen ei e ciao ea 3 1 3 2 1 Frame grabber s and synchronisation board Driver installati0N occcccnnncnnnncncnncnnnnininenines 3 3 2 2 Frame grabber s and synchronisation board installation 000ccccccceeeeeeeseeeeessseseeseeeeeees 3 1 3 2 3 Analog Input software and hardware installation occnnnnnnnnnnnncnononononinoninnninnninnninininininininines 3 2 3 24 DC Image Acquisition Software installation ooocccccnncnccnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnaninaninines 3 2 3 2 5 Uninstall the DC Image Acquisition software ccccccccccccnccnnnnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnanes 3 2 DNE OVI COIL PRENNENT 3 3 3b MAA A e detenta A am a 3 3 3 9 2 EOS ATA AA o aderant auam RIP IE 3 4 a AMO O eet Hr a ee ae ee eee Neer 3 4 4 Using the DC Image Acquisition software eee eere eee e e e eere eene nnne n tette teen eee s aset tette esee sesso eoa ae 4 1 Jl Me VISE UO AA E des Rassen us ema eMe E ec de Repas cq M amandi M Re spep ME se E e naar 4 1 da Onine GEGUIS TOR WIBOON enituit e ID Lc a deded 4
22. riate laser safety measures and follow local laser safety legislation Appropriate laser safety measures must be implemented when aligning and using lasers and illumination systems You are therefore urged to follow the precautions below which are general safety precautions to be observed by anyone working with illumination systems to be used with a laser Again before starting it is recommended that you read the laser safety notices in all documents provided by the laser manufacturer and illumination system supplier and follow these as well as your local safety procedures It is also recommended that you use the following accessories when working with the Nd Y AG lasers e Laser goggles e Laser power meter 1 3 CCD sensor warranty Direct or reflected radiation from Argon or Nd Y AG lasers can damage the CCD sensor of the camera This may happen with or without power to the camera and with or without the lens mounted Therefore when setting up and aligning for measurements take extreme care to prevent this from happening Laser damage may turn up as white pixels in the vertical direction or as isolated white pixels anywhere in the image This shows up clearly when acquiring an image with the lens cap on The CCD manufacturer has identified all sensor defects into classes Often the character and location of all defects are on record Additional defects arising from laser induced damage may void the sensor warranty Installation a
23. rn to the main FlowManager software for the processing of the images e Clear memory button This button is only enabled when at least 1 record is stored in the memory of the PC When pressing this Clear memory button all the data are removed from the temporary storage which frees the memory to another complete range of records acquisition This button must therefore be pressed when acquiring a new set of images 1 e after a set of records is saved to the FlowManager database or when the user is not content of the quality of the images recorded and thereby wishes to run a new acquisition keeping the settings as defined Once a number of records are acquired and stored in the memory of the PC they can be browsed one by one using the view control buttons Note that if only the Show Preview button is pressed there is no record in the system memory and therefore nothing to view View control gp EET Figure 4 9 Records in PC memory can be browsed via the View control feature of the DC Image Acquisition Software e Play buttons Use the play buttons to view the next image in memory gt or the previous image in memory This option can use to check the quality of some of the records before they are transferred to the database e Fast play button The Fast play button gt gt has a similar functionality as the Play buttons Position the slider at the first image you want to see press the Fast play butto
24. s DC or AC Like on an ordinary oscilloscope the user has the possibility to select or to remove any DC level offset by choosing AC e Attenuation Attenuation is related to the probe that is used If the operator uses a x10 probe then attenuation x10 must be used likewise for a x100 probe the attenuation is set to x100 When no probe are used just connect the BNC cable from the signal source set the Attenuation to x1 e Channel Enable For some boards it 1s possible to disable channel B e Range See Channel 1 settings e Coupling See Channel I settings e Attenuation See Channel 1 settings 4 2 5 Fail safe function For the safety of the user a fail safe function is included in the DC Image Acquisition software Installation and User s guide for DC Image Acquisition System To enable this safety system the Timer box which contains a watchdog circuit must be connected to the laser interlock The watchdog functions as a relay that establishes a connection between the two pins in the cable labelled Interlock when it is active This circuit is always held active by the DC Image Acquisition Software and if when the software crashes or when leaving the online acquisition section of the software it breaks the connection Important note Ifthe software crash ends by sending an error report the safety connection will not open until the user sends the report Also if a blue screen crash ends with memory dump the co
25. sheet and optics 3 2 System installation Important note Drivers for Frame Grabbers and Timer board must be installed before installing DC Image Acquisition Software Please follow the instructions provided below in the order of appearance 3 2 1 Frame grabber s and synchronisation board Driver installation Drivers for the frame grabbers can be found on the National Instruments CD ROM included in the DC Imaging System Package These drivers are e NI IMAQ v2 6 Driver for Frame grabber PCI 1428 e NI DAQ v6 9 3 Driver for PCI 660x Timer board Note These drivers must be installed before installing any hardware e Insert the NI IMAQ CD and follow the instructions given by the installation software e Insert the NI DAQ CD and follow the instructions given 3 2 2 Frame grabber s and synchronisation board installation Switch off the PC and install the PCI 1428 frame grabbers as described in the IMAQ User s Manual Install then the PCI 660x Timer board and refer to the DAQ User s Manual if needed Installation and User s guide for DC Image Acquisition System 3 To make sure the boards are properly installed start the MAX utility Select Start gt Programs gt National Instruments gt Measurement amp Automation from Windows environment If you are prompted about User preferences just click OK to proceed In the Configuration part of this software View gt Configuration select Devices
26. shutters Polygon scanners HiSense MkII Dantec TR PIV camera Time Resolved FlowSense M2 10 bit FlowSense M2 8 bit HiSense 12 bit HiSense 12 bit Strobe double frame Cylindrical lenses 05 09 1994 29 10 2003 Device Library file created modified C Program Files D antec Dynamics Flow anagersLibs sD evLib430 fdl Figure 4 2 Selecting the device library e Create a new database File Database New and a project with a new setup and add a HiSense MkII HiSense 4M or FlowSense 2M camera and the laser source from the library If the setup contains two cameras add a second camera of the same type The DC Image Acquisition System does not support mix of camera types e g FlowSense 1 HiSense MkII For multiple camera settings the user shall select and use 2 identical cameras i e either 2 FlowSense 2M 2 HiSense MkII or 2 HiSense 4M 4 2 Devices FlowSense M2 10 bit New ave Gemini with F Add Image Map est EI mm Edit Project 1 Data acquisition setup and flow Field description a Acquisition control Remove O Dais A imac map 16001193 Seeding Aca Control Delete Del Field of View Cam 1 Delete Underlyimg Alt Del Rename F2 Properties Figure 4 3 Selecting the appropriate camera settings using FlowManager set up functionalities e Select Options gt System Unit Type and Direct Computing Imaging FlowMap 500
27. ssary for the external trigger pulse to arrive so the laser fires or the shutter is opened Delays for the camera and laser shutter are also taken into consideration Due to these delays in camera and laser the trigger delay must be above a minimum value In case the specified value is below the minimum value the software will automatically update this value and display the adequate message With the present DC Image Acquisition System the maximum trigger delay is 4 seconds e dt The dt 1s the time between the first and the second laser pulse The first laser pulse is exposed in the first image frame A while the second laser pulse is exposed in the second image frame B The value of dt can vary in the range S5usec to 80 msec Naturally the adequate value of dt depends on the flow measured and camera set up Prior knowledge of expected velocities 1s typically very helpful 4 2 3 Frame grabber settings Tabs FG1 Info and FG2 Info Note Note There are no settings to be applied for the frame grabber and the camera that are part of the system The only information displayed is the grabber type the serial number and the memory on the board Figure 4 7 with as many dialog windows as there are frame grabbers installed in the PC The frame grabber is automatically detected when installed and its parameters are matched with the settings of the camera If the onboard memory is displayed as N A there may have been pr
28. t1 on the Timer Box to the Camera Timing I O connector HiSense MKII or 4M or DC In Trig FlowSense using the 10 m trigger cable If two cameras should be connected use a BNC T piece to connect both cameras to the Timer Box Outl connector Using the 10 m long BNC cables link the laser Flashlamp and Q switch connectors to the timer box as follows Connection on Timer box Laser cables Out2 Fire flashlamp 1 Out 3 Fire flashlamp 2 Out 4 For shutter option Out 5 Fire Q switch 1 Out 6 Fire Q switch 2 Out 7 Not used Out 8 Not used In 1 Trigger input In 2 Not used Figure 3 1 Connecting the interface cables to the Timer box Connect the camera power supply ies to the camera power connector s and to the 220 110V supply Turn on the power for the camera s and the PC Installation and User s guide for DC Image Acquisition System 3 3 3 3 2 Connections diagram Digital I O Timing 1 0 Camera 1 Power Camera Link Frame A 2 Camera 2 Frame _ 1 Gr abber 9 M r PCI 6601 6602 v Timer Box Laser dual cavity Inl Ext Trigger Input Figure 3 2 Overview on the DC Imaging System connections 3 3 3 Analog Input The operator always needs to select a Trigger signal to initialise the A D board and start data acquisition Typically the trigger signal that goes to the camera is used but any signal from the Timer box can be used as well When a signal is selected connect a BNC
29. the memory This is useful to ensure the system is set up properly for the wanted acquisition or for the focusing of camera s prior to image acquisition Press the Stop Acquisition button to stop the continuous preview Note When the Show preview button is pressed the system memory is initialised and the synchronisation board runs on triggering the camera at the rate specified in the timing setup i e fixed rate or externally triggered The software transfers each double image from the camera s and display it in the image map window At high trigger frequencies 1 e approx 2 3Hz for 1 camera system and approx 1 2Hz for 2 cameras systems overlap of images during updating the window may occur This cosmetic display problem depends on the processing power of the PC and does not indicate at all technical problems with the image acquisition itself e Initialize amp Acquire button Once the number of images and timing setup see next section are specified acquisition can be done Press the Start laser button and then the Initialize Acquire button the PC memory is initialised and when the system is ready the Begin message is displayed Figure 4 8b Click on OK to start the acquisition process or on Cancel to stop the acquisition process Note If the Start laser button has not been pressed before the acquisition a warning message is displayed asking to start the laser or cancel the operatio
30. trol window Trigger control related parameters e Trigger mode The DC Image Acquisition System allows both internal run 1 e user defined acquisition frequency and external triggering In the latter case an external trigger source must be connected to the Timer Box In1 connector see Figure 3 3 When selecting the trigger mode Internal master clock the trigger pulses are generated by the synchronisation board at a rate specified in the Trigger frequency field between 0 25Hz and a camera dependent maximum rate When setting the trigger mode to External sync the trigger pulse generated by the external trigger source control the acquisition system Note that the software makes sure that the camera is not triggered at a rate faster than maximum rate If the trigger pulses arrive faster than this frequency only every N th pulse triggers the measurement with N chosen so that the frame rate comes just below the maximum rate e Trigger frequency The trigger frequency determines the rate in Hertz Hz at which the camera is triggered to deliver double images In External sync trigger mode this field is disabled as the trigger frequency source determines this acquisition rate Installation and User s guide for DC Image Acquisition System 4 7 Note e Trigger delay Note that this option is only available when the External sync trigger mode is selected The Trigger delay specifies the time nece
31. used as temporary storage for the images acquired Therefore to make the acquisition process more efficient in terms of maximum number of images the system memory must be prepared for the data before the acquisition actually takes place Also depending on the amount of images to acquire this initialisation process will take some time When the acquisition is started by pressing the Preview or Initialise Acquire button a message is displayed informing about memory initialisation Once done the button Begin is enabled and when pressed the acquisition begins with the settings described in the sections below At the time of preparation max 9096 of the available memory can be reserved for Image acquisition temporary storage while the remaining 10 are reserved for the operating system NE o EIE IEEE T Acquisition Control Timing Setup FG 1 Info FG 2 Info E Acquisition Records to acquire 50 L useful range Show Preview Start laser Initialize Acquire Max Rec 55 MBytes 57 time 11 00 Figure 4 7 Acquisition control tab Acquisition parameters e Records to acquire amp Use full range To acquire a serie of images specify the number of records to acquire or check the option Use full range to record the maximum of records possible with the system used Note that 1 record refers to a double image from each camera Also this maximum number of images is limited
32. wing sections e Acquisition Control e Timing Setup e Frame grabber information FGI Info and FG2 Info when two cameras are installed see Figure 4 6 Next to this dialog box a window displays images acquired during preview or while viewing images from temporary storage If two cameras are installed and set in the acquisition settings images from each camera are displayed in separate windows If only one camera is included in the setup but two frame grabbers cameras are installed in the system the software always use the camera connected to the first frame grabber detected and this even if it has been specified as camera number 2 in the setup 1 Use full range Show Previa Start laser amp cquire images Clear memory Max Rec 0 MBytes O time 0 00 Lr Lm Records to acquire Transfer images to database From 1 Eo 1 gt e Save all Records 1 Save in database Figure 4 6 The online acquisition window with Acquisition control tab Timing setup tab and camera Information tab s 4 2 1 Tab Acquisition Control The acquisition control tab includes all the functionality needed to control the acquisition process either as preview or storage the display of images from the intermediate storage as well as the process of saving the images to the FlowManager database environment Installation and User s guide for DC Image Acquisition System 4 3 Note that the system memory in the PC is
33. wire from the BNC T splitter to the external trigger input of the A D board Details on the use of the A D software are reported in the sections below Channel A Channel B EXT CLK EXT TRIG Figure 3 3 Analogue Digital board 3 4 Installation and User s guide for DC Image Acquisition System 4 Using the DC Image Acquisition software 4 1 First time use File Edit View Setup Run Database Mew BG Open Export Target Manager Note Installation and User s guide for DC Image Acquisition System Every time the computer is booted a utility software will initialise each frame grabber board installed During this initialisation the following message 1s displayed The message will remain for some seconds and longer time if 2 frame grabbers are installed Ww Initializing your IMAC hardware Figure 4 1 Utility software for initialisation of each frame grabber board installed in the computer e Start FlowManager software and select the correct device library This is found by selecting File Libraries Device Library Press File Open and select DevLib440 fdl which contains the available devices When the default installation path for FlowManager is used this file is found in the path C Program Files Dantec Dynam ics FlowManager Libs Analysis Options Ctrl HN Ctrl Device Library Select device type Cameras Camera shutters Camera lenses Lasers Laser
34. ype Currently Dantec Dynamics HiSense MkII HiSense 4M and FlowSense 2M cameras are supported running in double frame mode only Trigger pulses are generated by the system to be used to trigger a pulsed laser or a shutter device 2 2 Cameras supported by the DC Imaging System 2 2 1 HiSense Mkll camera The HiSense MkII camera uses a highly performant progressive scan interline CCD chip with typically 72 quantum efficiency at 532nm This chip includes 1344 by 1024 light sensitive cells and an equal number of storage cells In cross correlation mode the only available mode with the DC Imaging System the first laser pulse exposes the CCD and the resulting charge is transferred as the first frame to the storage cells immediately after the laser pulse The second laser pulse is then fired to expose the second frame The storage cells now contain the first frame and the light sensitive cells the second These two frames are then transferred sequentially to the digital outputs for acquisition and processing The charges in the vertical storage cells are transferred up into a horizontal shift register which is clocked out sequentially line by line through the CCD output port In relation to PIV and planar LIF experiments the Dantec HiSense MKII camera has a number of benefits compared to other cameras with Very high light sensitivity typically 72 quantum efficiency at 532nm Extremely low background noise The high dyna
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