UMS Control Software: User Guide
Contents
1. c gt B gt fo 0 ovo ce m E o gt 552 SEEMS 2D Profle 11 000 FRI TDC AGC d axis ony Gil pauenbs abeyon Y mm n Ultrasound Measurement System Control Centre PRECISION ACOUSTICS LTD FIGURE 11 PROGRESS OF A PLANAR 2D SCAN SCRIPTING The ACTIONS Scripting feature of the UMS system allows the user to perform a predetermined sequence of automated measurement tasks i e alignment scanning moving and configuration without any intermediate user input Scripts are created through the scripting Ul accessed on the Scripting page which also displays a list of previously written scripted measurement tasks The scripting UI is shown in Figure 12 The left hand side of the display shows the list of operations making up the measurement task The tab control to the right allows the user to customise each of the tasks New operations are added to the list by choosing from the Operation drop down list and then clicking Add Operations are customised by selecting them in the main list setting the values in the tab control to the right and pressing Update Tree The Move Up and Move Down buttons move the selected operation up or down the tree The script can be given a description which is displayed in the scripts list within the main UMS GUI Once complete the script is saved to file by clicking Save and the user can return to the main UMS software2. m C gt UMS Control Software PRECISION ACOUSTICS CONTENTS ugeet de DEE 1 Setning Up DEE E 1 Inistallation of the UMS SOftWALre cite mco d e tee i peret t ee Eee Lee tay tine eer Rete Een g s 1 Connecting external devices eret te eese oen bora eR een ode ye nea i RR uh area ko ea nada e nde vae enean euo 1 Emergency stop switch E Stop srties niena eis aetna eaaa eaea oaea aaea ara aA eea a Eaa da a DE da EREKE ia EN ay 1 Axis MIMI SWITCHES series ERE TEE ETT EL LLL LL 2 The UMS User interface ee ee t iae eee des ests rated e ade eka 2 Urteel le de C H Measurement Configuration iie RE e CERERI EENS 6 Time Delay Compensation TD 6 Automatic Gain Control AGC ice tire ettet leere ated Dee deser deed Sege e 6 Axial SQUUp E 7 Measurement up ARSA 7 TE ERTEILEN 7 Setting measurement information 5 5 I HE gg ed dede iR eter eese entr eere 7 Configuring a function generator ener s innen ir rns ensis sn tense n nennen innen nnns 8 Moving ET EE 9 BI3ibeEcleme 10 Autoalignment Find beam max eiie iine aite ENEE dete ha Eph deter do ee Ie aa Ede Ie Ra TE ee aL Eee aa Eae ee aa Ede na aide 10 Calculate angular misalignment reiner nere nice eic nts denote ntis oaa ente ena ine nana Ee eaa ree 11 Align Axis W Teal R
3. Screen Dump Simple move rotate Se Planar Scan Linear Scan The on screen waveform Hydrophone moves Hydrophone undertakes User supplies Axes User supplies Axis is transferred from to requested horizontal line scan and number of points number of points LeCroy to PC and saved location when complete moves to increment and increment and to file if requested the required position filename information filename information Each row of scan Hydrophone moves kvaron tone An conducted as a line P to measurement when complete moves to Vh position the required position Data acquired from Line Scan complete LeCroy ana saved to Planar Scan Advance to next row complete Y y OPERATION COMPLETE YES Process acquired data Continue data acquisition Go to data processing Exit UMS FIGURE 1 FLOW CHART OVERVIEW OF UMS SOFTWARE Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk CH i gt UMS Control Software PRECISION ACOUSTICS UMS Library lvlib UMS_Main vi rev 357 Fie L tze Temperature ACTION li User Temperature Select 5 Action list Paul 1 Status indicators 6 Main display area Welcome to the Precision Acoustics Ultrasound Measurement System control centre Please select an action from the list above
4. i y p 00027 d axis only lt gt Averages Window FFT only Channel 1 Single Waveform Single Waveform HN fRecanguar Simple acquisition directory File name 4 C SVN Temp Ur Ultrasound Measurement System Control Centre RECISION ACOUSTICS LTD FIGURE 9 SIMPLE ACQUISITION PAGE All waveforms acquired using the UMS software either individually or through scanning are saved as ASCII text files Each waveform file comprises a header section containing information from the measurement information data and a data section which identifies the type of data contained within the file and then lists the data A more detailed description of the waveform file structure is available on request However it is typically assumed that all data viewing and post processing will be done through the supplied post processing software Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 15 CH s gt UMS Control Software PRECISION ACOUSTICS SCANNING The UMS system can perform 3 types of scan Linear i e 1D planar i e 2D or arbitrary following a user generated array of co ordinates Scan configuration is accessed via ACTION Scan the configuration page is shown in Figure 10 UMS Library lvlib UMS Main vi rev 357 File Utilities ACTION User Temperature Select Paul 22
5. oscilloscope The purpose of TDC is to automatically adjust the time delay setting on the oscilloscope such that the signal of interest is maintained within the acquisition window even if the time of flight changes due to a movement Two modes of TDC are available Z axis only and XYZ The former offers the simplest implementation of TDC In this mode only moves parallel to the acoustic axis cause a change in the time delay For each move in Z the distance moved is converted to a change in time delay using the water temperature dependent speed of sound which is then sent to the oscilloscope In XYZ TDC mode the distance between the source and detector is calculated and used to update the oscilloscopes time delay When XYZ TDC is selected the user is prompted to perform a Find beam max operation in order that the system can determine the co ordinates of the front face of the source This is necessary for the proper operation of XYZ TDC Once complete the system uses simple trigonometry to determine the source detector separation after each move and update the time delay accordingly For most applications it is likely that Z axis TDC will be sufficient For proper operation of both TDC modes it is necessary that Axial setup and Measurement mode controls are appropriately set Additionally an accurate water temperature is required for optimum TDC operation The automatic gain control AGC is designed to set the oscilloscope gain and o
6. Centre PRECISION ACOUSTICS LTD FIGURE 4 CONFIGURE SOURCE DISPLAY MOVING THE SYSTEM The UMS software allows the user to position the hydrophone transducer manually within the test tank as well as to perform automated alignment procedures The Move page is shown in Figure 5 The display is split into 3 main sections Single axis incremental movement multi axis positional movement and automated tasks Incremental moves are achieved by selecting the desired lt Linear increment gt or lt Angular increment gt and then clicking the lt Axis gt or lt Axis gt button for the axis to be moved The system can also be moved to a specific co ordinate in the current system by entering the value into the appropriate go to box and clicking lt Go to Axis gt It is possible to set reference positions to return to at a later time during the active session 3 linear reference positions are available they are set by positioning the system in the desired location either manually or by means of an auto alignment and then pressing lt Set gt in the position box To return to this position later simply press lt Go to gt in the lt Position n gt box Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk m C gt UMS Control Software PRECISION ACOUSTICS UMS Library lvlib UMS Main vi rev 357 User Tempe
7. Configure Scan Linear Scan Planar Scan Arbitrary scan Acquisition settings Scan details Reference Position Corner Channel 1 End position Scan origin Blackman Harris i Filename stub 7 Sg Previous Scan Specification EB Ultrasound Measurement System Control Centre PRECISION ACOUSTICS LTD FIGURE 10 SCAN CONFIGURATION PAGE Linear 1D scans can be performed along any individual axis of the UMS system The user selects the axis to scan the spatial increment of the scan mm for linear axis scans degrees for angular scans and the number of points within the scan The starting point of the scan is determined through the lt Reference Position gt control within the Scan details section The options are either Corner or Centre If corner is selected the scan will start with the current position as the first acquisition point If centre is selected the start point will be calculated such that the current position is at the centre of the scan Note that if an acquisition point is required at the current position then an odd number of points should be entered when configuring a centred scan The position to which the system moves once the scan has complete is set using the lt End position gt control Options include the scan origin the centre of the scan the maximum of VSI or the final point of the scan The directory used to store the scan data is selectable the defaul
8. between the scope triggering pulse and the generation of the acoustic signal note this is NOT the same as the time delay seen on the oscilloscope this is the delay between generation of the trigger pulse and the acoustic signal If Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 12 m C gt UMS Control Software PRECISION ACOUSTICS these values cannot be specified the translation compensation will not work and the user should take care when setting up an alignment to ensure the scans are wide enough that the signal is not lost The settings used for an alignment can be saved to and loaded from disk using the Save and Load buttons in the dialogue When using the Align axis with tank procedure with the PA gimbal several things must be taken into account The positional resolution and precision of the gimbal mount at 1 and 0 05 respectively Therefore the minimum sensible angular tolerance should be 0 05 However the resolution with which the angular misalignment can be measured and hence the resolution of the applied correction is determined not by the gimbal mount but the measurement conditions themselves including the acoustic field For example the angular misalignment in the Abt Y rotational axis is determined from the equation E AQ y tan Ich 7 Zo 7 Assuming the Find beam max sc
9. text file with the following structure N no of points in file X Y Z 0 point number Xi Yi Zi 1 L Y Z2 N Xn YN Zn Prior to commencing a scan the user can enter details of the device under test and the test equipment being used by pressing Set device ID During a scan UMS displays the current progress including the number of points remaining and an estimate of the time remaining Depending on the type of scan running UMS will also display the last acquired waveform and a 1D or 2D profile of the voltage squared integrals of the already acquired waveforms as shown in Figure 11 In the case of an arbitrary scan the system will display the progress as a 1D profile At any point during the scan the lt Abort Scan gt button can be pressed to halt the scan In this case a dialogue is shown allowing the scan to be resumed or terminated If the scan is resumed it will continue without missing any data points If it is terminated the system will return to the scan origin position Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 17 L2 C gt UMS Control Software PRECISION ACOUSTICS UMS Library lvlib UMS Main vi rev 357 Fie Utilities ACTION Temperature se lll Scan results Scan Status Last acquired waveform Positions remaining 0 6 375 Time remaining 0 03 46
10. to set the order and number of times the autoalignment algorithm is run Setting Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 10 m C gt UMS Control Software PRECISION ACOUSTICS lt Iterations gt to 1 will run each selected axis once setting it to 1 5 will run the algorithm on axis 1 axis 2 and then axis 1 again The process always begins from the current position of the hydrophone transducer Auto alignment algorithm settings Auto alignment settings Increment Axes soi n 0 1 E Iterations 1 5 FIGURE 6 AUTO ALIGNMENT SETTINGS DIALOGUE FOR FIND BEAM MAX In this mode the system will return the hydrophone transducer to the position of maximum VSI after each line scan Centre of 3 6dB drop In this mode the system will find the positions of the 3 or 6 dB drops from the maximum and then move to the centre of these Centre of mass 3 6dB In this mode the system will compute the position of the centre of mass of the VSI profile between the positions of the 3 or 6dB drops and move to that position The centre of mass is defined as the position corresponding to the average value of the integral of the VSI over the range selected and is calculated as EA VS cut ere The Calc Misalign gt allows the user to measure the misalignment between the acoustic axis of a t
11. with the generation of the acoustic pulse The acoustic tone burst should be clearly visible preferably expanded on the oscilloscope TDC must be enabled to at least Z axis only Bg mE When performing this operation the system first finds the current time delay to the first peak trough of the acoustic pulse whose amplitude is gt 15 of the peak amplitude the difference between the target time delay and the current time delay is then calculated and converted to a distance to move in the Z direction The system then moves the appropriate amount and checks the position of the peak The process is repeated until the time delay is within the tolerance set when initiating the alignment The Home all command is only available on systems using linear magnetic encoders and where an index reference sticker has been applied to the axes In this case pressing the Home all button allows the user to move the system to the fixed reference position and reset the co ordinate system to Absolute relative to the fixed reference A dialogue is displayed which allows the user to select which axes to home Only if all linear axes are homed is the system considered to be in Absolute position mode When homing all axes the system will home each axis in turn The Reset Zero button allows the user to make the current position the zero of the co ordinate system for the current session Pressing this button will return the system to Relative pos
12. 669 e pa acoustics co uk www acoustics co uk m C gt UMS Control Software PRECISION ACOUSTICS 2 All power is cut to the optional Gimbal mount assuming the gimbal mount wiring is integral to the system where a gimbal mount has been supplied as an add on this may not apply a Note Since the motors used in the current gimbal mount are servos they can be backdriven when power is removed Therefore great care should be taken to avoid mounting heavy items on the gimbal above its pivot point as this arrangement is inherently unstable and removing power could cause the load to flip and potentially cause damage to the system 3 The software process which was running will detect the ESTOP activation and pause its execution A dialogue is displayed on the screen indicating that the ESTOP has been activated The user can then clear this dialogue by selecting the appropriate option once the ESTOP has been released The software warning dialogue is displayed on the software when the E Stop has been activated The dialogue gives the user 3 options for resuming operation after the E stop has been activated 1 Skip Discard the operation move which was interrupted by the E Stop and move to the next move operation 2 Retry Attempt to complete the requested move which was interrupted by the E Stop 3 lt Abort gt Discard the interrupted movement and abort any running scans scripts Note 1 and 3 are equivalent if only a s
13. Axis configuration Default User foi ene ME Prefs default TDC Mode AGC d axis only GG Axial setup F Fixed transducer Measurement mode Display advanced Scan settings controls indicators Dx Recall position on power up Di Ultrasound Measurement System Control Centre RECISION ACOUSTICS LTD FIGURE 13 BASIC CONFIGURATION PAGE IN PREFERENCE SETTING TROUBLESHOOTING Whilst every effort has been made to test and debug UMS software it is designed to present an error dialogue to the user in case of internal errors In certain cases the error may be considered Fatal and the software will shut down If an error is displayed that does not resolve itself please make a note of the full text a screen shot may be useful and contact us for help COMMON SOLUTIONS This section provides a list of things to check in case of problems with the system If the system presents an error on initialisation read carefully the error message as it will identify which piece of equipment failed to initialise correctly Things to check 1 VISA Resource name Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 21 m C gt UMS Control Software PRECISION ACOUSTICS This the reference name for the communications interface for the device in question If the device is connected v
14. MS software will timeout Failure to trigger can result if the oscilloscope is configured to trigger from the acoustic signal being measured during a scan the signal amplitude can fall below the trigger threshold causing an error To minimise the risk of scope triggering errors it is advisable to use an external trigger from the function generator or equivalent Additionally ensure the correct Source channel is set when acquiring waveforms The function generator control given by UMS is designed to include the functions typically required for acoustic measurements However not all function generators support all of the commands provided by UMS If a non supported command is sent a notification is displayed to the user Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 22
15. PZT Unfocussed Transducer Diameter Through transmit Settle time ms Ur Ultrasound Measurement System Control Centre RECISION ACOUSTICS LTD FIGURE 3 SET MEASUREMENT INFORMATION PAGE CONFIGURING A FUNCTION GENERATOR To configure a function generator select ACTION Configure source This action allows the user to configure a supported function generator connected to the UMS host PC e g via GPIB The configure source page is shown in Figure 4 Any change to Function generator settings results in the immediate update of the generator output In addition to changing the current settings of the function generator UMS allows the user to create store and recall function generator configurations The available presets are listed in the table on the lower half of the display The buttons to the right allow the user to create load or delete configurations Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk m C gt UMS Control Software PRECISION ACOUSTICS UMS Library lvlib UMS Main vi rev 357 File Utilities ACTION User Temperature Ke ai J e Configure Source Generator type Function generator Function generator settings Function generator ID Waveform Type Model HP3314A bi Ultrasound Measurement System Control
16. am max sess 11 Figure 7 Auto alignment algorithm settings for calculation of misalignment eese 12 Figure 8 Auto alignment algorithm settings for align beam witank esses nnns 13 Figure 9 Simple acquisition page teer netos eben tea edet vadevess dde aree the eR edo e EEE pede d edes 15 Figure 10 Scan configuration page eee enhn inner intense n nnne nsi arse tn serre s tennis nsns 16 Figure 11 Progress of a planar 2d scan enne nnne nennen enses inner inns essen 18 Figure 12 UMS scriptinginterfaCe cete teet cerae eege 19 Figure 13 Basic configuration page in preference setting eene nnne nennen 21 Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk m C gt UMS Control Software PRECISION ACOUSTICS INTRODUCTION UMS is a custom built test tank system for making a variety of ultrasound measurements This manual describes the use of the system and supplied software for making measurements and post processing acquired data to obtain relevant acoustic parameters Throughout this manual whenever a front panel control is referred to it will be identified thus Finish a control or indicator labeled Finish on the front panel File2 Open the Open item from within the File menu on the front panel SETTING UP THE SYSTEM INSTALLATION OF THE UMS SOFTWARE The UMS con
17. an increment was set to 0 1mm and the align to max option was selected the minimum non zero value for the numerator is clearly 0 1mm To obtain a measurement resolution equal to the minimum possible tolerance of the gimbal i e 0 05 the inter planar separation must be E c E 114 6mm tan 0 05 Such a large inter planar spacing may not be possible depending on the configuration of the system and the properties of the acoustic field used It should be noted that the algorithm assumes that the Find beam max process is finding the acoustic beam axis i e that there is a maximum in acoustic intensity on the acoustic axis this cannot be assumed in the near field of the transducer or at all distances from a focussed transducer Auto alignment algorithm settings Auto alignment settings Acquisition settings Increment Axes FIGURE 8 AUTO ALIGNMENT ALGORITHM SETTINGS FOR ALIGN BEAM W TANK Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 13 L2 gt UMS Control Software PRECISION ACOUSTICS The Move to dt button allows the user to position the hydrophone transducer at a given time of flight for the acoustic signal To achieve this several conditions must be met The acoustic signal must be a pulse or tone burst not CW The trigger signal supplied to the oscilloscope must correspond
18. axial position At the end of the measurement the acquired profiles are displayed along with the calculated angular misalignment of the system The lt Align axis w tank gt option is only available if the system was supplied with a 2 axis gimbal mount allowing rotation in the Abt_X and Abt_Y senses This function aligns the acoustic axis of a transducer held in the gimbal mount with the Z axis of the scanning system by adjusting the Abt_X and Abt_Y axes The automated sequence performs a Calculate misalignment procedure as detailed above the misalignment is then corrected by adjusting the gimbal mount the measurement is then repeated to verify the movement The user can select the lt Find beam max gt options to use as well as specify an angular lt Tolerance gt for misalignment when the calculated misalignment is less than the tolerance the system is considered to be aligned and the process ends In addition to the settings for the measurement of the angular misalignment the user can enable Translation compensation Trans Comp to compensate for any translational motion of the transducer caused by movement of the gimbal during the alignment This is designed to reduce the possibility of the system losing the acoustic signal following the corrective gimbal movements When this is enabled the user must specify both the vertical distance between the rotational axes of the gimbal and the front surface of the transducer and any time delay
19. by clicking Finish The created script can then be run by selecting it from the list A script progress dialogue shows a list of the tasks in the script and highlights the current operation The UMS display will also update as individual tasks are performed i e the scan display page will be shown when a scan is running Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 18 L2 C gt UMS Control Software PRECISION ACOUSTICS PA UMS Scripting library Ivlib SCRIPTING User interface vi rev 153 Operation Script description E mm Last saved on Created edited by Paul Setup signal generator Function generator settings Load from list Created by Eee The att Ll bs 1MHz 25 0 5V Paul 06 08 2010 me n UPDATE TREE LOAD SAVE FINISH Di MEM s UMS Scripting interface ISION ACOUSTICS LTD FIGURE 12 UMS SCRIPTING INTERFACE CONFIGURING THE UMS SYSTEM SETTING PREFERENCES The ACTIONS Set preferences action takes the user to the preferences screen Preference setting is split between five sub screens BASIC CONFIGURATION Here the user configures basic interface options options including the Default User Measurement config gt The visibility of the automatic function buttons on the move page can also be set to prevent users from using t
20. e user to update the displayed position if the axes have been moved manually 4 System configuration The lt Measurement config gt control indicator shows the current settings of the system From this control the user can select Time Delay Compensation TDC mode enable Automatic Gain Control AGC set the axial setup Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk L2 C gt UMS Control Software PRECISION ACOUSTICS fixed transducer or scanning transducer and measurement modes pulse echo or through transmit and set the settle time used after each move to minimize the effect of vibration on measurements 5 Action list The ACTION list is used to select the task to perform 6 Main display area The main display area is dynamically updated to show the relevant controls indicators for the selected action 7 Exit The EXIT control closes down communication with the UMS system and other peripherals oscilloscope function generator etc and exits the program MEASUREMENT CONFIGURATION The time delay compensation TDC function within UMS is designed to allow users to perform automated measurements which change the time of flight of the acoustic wave between the source and detector and which would otherwise require user intervention to maintain the acoustic signal within the acquisition window of the
21. ffset to optimise signal acquisition When enabled prior to any data acquisition a single snapshot waveform is acquired from the oscilloscope and the maximum and minimum voltage values are compared to the current range and offset of the scope display A simple algorithm then adjusts the gain and offset settings to centre the signal in the display and fill approximately 8096 of the vertical space Once complete the requested acquisition task is completed Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk L2 C gt UMS Control Software PRECISION ACOUSTICS AGC is most useful when performing scans on focussed fields where the variation in signal amplitude over the scan range is large When performing scans on fields where it is known that the signal variation is minimal it may be more time efficient to disable AGC as it will have a detrimental effect on scan times AXIAL SETUP The Axial setup control within Measurement config must be set to reflect whether the acoustic source Transducer is fixed in position or mounted on the moving XYZ axes The Measurement mode control must be set to reflect whether the system is being used for pulse echo i e transducer reflector measurements or through transmit i e transducer hydrophone measurements The Settle time control allows the user to set a ti
22. he advanced functions if desired From here the system can also be configured to recall the co ordinate of the current position on power up With this option checked the last known position indicator will be updated to the last known co ordinate of the system on power up DATA DIRECTORIES Here the user can set default data directories for simple acquisition data script files reference hydrophone data and auto alignment settings AUTO ALIGNMENT SETTINGS Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 19 L2 C gt UMS Control Software PRECISION ACOUSTICS Here the user can set the default parameters for auto alignment procedures including data acquisition settings PERIPHERAL CONFIGURATION This page is used to configure peripheral devices oscilloscope function generator thermocouple The user can use this page to connect and disconnect devices once the software is running and also set the default device configuration All devices can be set to simulate if absent to preview the software functionality or test scripts without the system being connected The system can maintain a list of different hardware devices used by the system For example if more than one function generator is used with the system the details for each can be saved by the system and recalled when needed To add a device to the li
23. ia GPIB the name should be of the format GPIB n m INSTR where n is the GPIB controller within the host PC typically n O and m is the GPIB address of the instrument this can typically be checked set on the device itself For a Lecroy Oscilloscope using Ethernet communication it should be of the form vicp xxx xxx xxx xxx where the xxx s correspond to the device IP address on the network Devices connected over a serial interface e g the main linear axes should be of the form COMX where X is the COM port number of the interface on the PC this may be checked using the Device Manager within windows 2 Device driver Each connected device requires a driver Check that the correct device driver is selected for each device type The Device driver control automatically lists all drivers for each device type that are installed on the system If the driver for your device is not listed please contact us The driver for the Stepper system and Gimbal mount is not user selectable 3 Power and connectivity Check all devices are powered on and connected to the host PC For Ethernet devices such as some Lecroy oscilloscopes ensure both the host PC and the device are connected to the network and that the network is properly configured The most common error to occur on acquisition of a waveform is a timeout This can occur if the scope triggering is not well configured If the scope is not triggering it is not acquiring data and the U
24. ingle move was commanded and interrupted The system will not move and may not properly initialise if the E Stop switch is latched ensure the switch is released once the situation leading to its use has passed and when starting the UMS software AXIS LIMIT SWITCHES As with the E Stop switch if any of the limit switches is activated during movement that movement will halt immediately and a dialogue message will be displayed in the user interface indicating which limit switch was activated and offering the user the same three options as for the E Stop control For more information on the operation of the limit switches see the UMS system manual THE UMS USER INTERFACE INTRODUCTION The UMS user interface software provides complete control of the UMS scanning test tank system The software permits a wide range of data acquisition tasks for ultrasonic measurement Data acquired by the UMS software Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk L2 C gt UMS Control Software PRECISION ACOUSTICS can be subsequently loaded into the post processing application for analysis A flow chart overview of the UMS software can be seen in Figure 1 In addition to the individual measurement tasks highlighted in the figure UMS also allows users to define and execute a series of automated tasks to perform through scri
25. ition mode The Do AGC command will cause the scope to set its vertical settings on the Measurement Channel such that the acoustic signal fills 6 5 major divisions in the vertical sense and is centred on the display Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 14 L2 gt UMS Control Software PRECISION ACOUSTICS REDEFINE POSITION The Redefine position command enables the user to redefine the co ordinate values in the position display Any or all axis position can be modified at any time Doing this will cause the system to enter relative position mode ACQUIRING WAVEFORMS Acquisition of single waveforms is carried out via the XACTION Simple acquisition action The Simple acquisition page shown in Figure 9 allows the user to acquire a single waveform an N averaged waveform or a Power Spec FFT of the selected source channel Once acquired the waveforms can be stored to disc in the Simple acquisition directory by clicking Save to file UMS Library lvlib UMS Main vi rev 357 File Utilities ACTION Temperature ga Simple acquisition Acquired waveform 0 035 0 03 0 025 0 02 0 015 0 01 0 005 Voltage Waveform V 0 0 005 Measurement config xum 0 000264 0 000266 j 0 000272 0 00027 us SI i
26. m 12 Move to Re EE 14 Home REP R P 14 Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk gt UMS Control Software PRECISION ACOUSTICS Data file TEE 15 ken c 16 lena ERR 18 Configuring the UMS system Setting Dreierences ener enne nnn nn nnne n nennen 19 Nei Ee EN COMMON SOIUTIONS lt 2 edie aie dee eee ce ei ee e Ee 21 InitialisatiOn ET Te EN Waveform acquisition errors eene enne nnns nennen nne kAnin SSKA SASAKA ANNEE nn EEaren EEaren 22 Function generator configuration errors eee enne enne innen rennes enses nnne nnns 22 Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk m C gt UMS Control Software PRECISION ACOUSTICS TABLE OF FIGURES Figure 1 Flow chart overview of UMS software cscccssscssssecssecesecesseecseeeeceuecsesaesseceeeceaeessaaessessecsseeseaeeseaeeseaaessentess 4 Figure 2 Opening page of UMS software Interface 5 Figure 3 Set measurement information page 8 Figure 4 Configure source display sessi eene enne pietansa oaaae iaiaeiaeiaa aaike taia 9 Figure Ss Move display s emere erit etel Ee 10 Figure 6 Auto alignment settings dialogue for find be
27. me delay to be observed after each move command This allows any vibration or oscillation in the scanning axes to stabilise prior to data acquisition The amount of settle time required depends on many factors including the mass and size of devices mounted on the axes the stability of the floor on which the system is mounted etc It is thus up to the user to set an appropriate delay time for their system SETTING MEASUREMENT INFORMATION ACTION Set measurement info allows the user to input system setup and measurement information relevant to the measurement task being undertaken The measurement information page Figure 3 contains a tab control allowing the user to enter information relating to the Device under test the Measurement conditions and the Test equipment used for the set of measurements The information entered is stored in the header of any data acquired and saved by the UMS software Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk L2 C gt UMS Control Software PRECISION ACOUSTICS UMS Library lvlib UMS Main vi rev 357 File Utilities ACTION User Temperature a Ez Measurement information Device under test Measurement conditions Test equipment Hydrophone Transducer Transducer pulse echo Device identification Reference hydrophone 8 Select device
28. pting offering significant time saving When UMS is loaded the software checks for and initialises the various hardware elements of the test tank system as configured through a preferences file Once initialisation is complete the front welcome page is displayed as shown in Figure 2 The user interface is divided into 4 active regions The top row and right hand side remain static during operation providing access to the various possible actions and status position and configuration information The central main display area is dynamically updated with controls and indicators specific to the selected measurement task action The numbered items from Figure 2 are described below Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk c gt UMS Control Software PRECISION ACOUSTICS Start UMS software y Automatically load preferences from file Many issues are controlled within the preference file including instrument selection scope signal generator address of instrument GPIB Edit preferences and 9thernet COM port save file to location of data directories YES y System ready for use and awaiting user input Y
29. ransducer and the Z axis of UMS When selected the Auto alignment algorithm settings dialogue Figure 7 is launched to configure the measurement To calculate the angular misalignment UMS performs the Find beam max procedure at two distances from the transducer The find beam max settings are configured as above the user then specifies the Axial separation the distance in mm between the two Find beam max procedures The angular misalignment in the Abt Y rotational axis is determined from the equation Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 11 m C gt UMS Control Software PRECISION ACOUSTICS Hence it can be seen that for a fixed increment in the find beam max procedure the larger the axial separation the better the resolution of the measurement However the system must find a maximum at each of the axial positions so care must be taken to set up the measurement appropriately for any given transducer Auto alignment algorithm settings Auto alignment settings Increment Axes 3 Alignment method Iterations Source Channel MPek B Channel 1 FIGURE 7 AUTO ALIGNMENT ALGORITHM SETTINGS FOR CALCULATION OF MISALIGNMENT The user may run the calculation in lt Manual gt mode In this instance the system will pause after the first find beam maximum before proceeding to the 2
30. rature pau d Rp Linear increment Angular Increment Position 1 UMS offers two possible tank configurations horizontal acoustic beam along the tank or vertical acoustic beam The linear axis corresponding to the acoustic beam is always the Z axis Additionally the X axis is always the axis which crosses the test tank When configured as a vertical system then the Y axis is that which runs along the length of the test tank Z being vertical When configured as a horizontal system the Z and Y axes are swapped giving Z as the axis running along the length of the tank and Y as the vertical axis Axis configuration can be set in the ACTION gt Set Preferences Hardware configuration gt Stepper system control Find beam max initiates an auto alignment algorithm designed to place the hydrophone transducer at the position of maximum acoustic signal max voltage squared integral VSI at the current distance from the transducer The alignment is configured via the Auto alignment algorithm settings pop up dialogue box Figure 6 When started the system will either perform a number of linear scans in the selected pair of orthogonal axes The user selects the lt points gt and lt Increment gt for the 1D scans and can then select from 3 alignment methods Peak Centre of 3 6 dB drop and Centre of mass 3 6 dB For improved accuracy the user can also use the Iterations control
31. st of available devices click Edit list for the appropriate device type An instrument driver file is required for each device used the list of currently available device drivers can be obtained by contacting technical support If it is necessary to control a device not currently supported additional drivers can be written but a fee is usually charged to cover development Please contact technical support for more details if required AXIS CONFIGURATION This page allows the user to configure the moving axes of the system The user can set which axes are present in the system and which axes to simulate If the configuration file indicates that a specific device should be present but communication or initialisation fails an error message indicating which device has failed to initialise will be displayed on start up and the software will display the hardware configuration page Should this occur depending on which device fails to initialise you may need to manually connect the peripheral devices once the appropriate corrective action has been taken Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 20 L2 C gt UMS Control Software PRECISION ACOUSTICS UMS Library lvlib UMS Main vi rev 357 User Temperature Pat fa Interface Data directories Auto alignment settings Peripheral configuration
32. t value can be set in the preferences section as is the filename stub applied to each of the scan files A scan specification file ssf is created when the scan commences and saved in the same directory as the scan data This file contains the settings used for the scan and is used by the post processing suite Previous scan settings can be loaded in from the ssf file by entering the file path in the lt Previous Scan Specification gt control and pressing lt Load gt Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264669 e pa acoustics co uk www acoustics co uk 16 CH i gt UMS Control Software PRECISION ACOUSTICS As with the automated alignment procedures the data acquisition settings to be used for the scan are set in the lt Acquisition settings gt control Planar 2D scans are configured in the same way as linear scans on the Planar scan tab of the configure scan page In this case the user configures both the lt Row gt and lt Column gt of the scan The Row is the axis which is incremented for each measurement whereas the Column axis incremented after each row is complete Arbitrary scans require the user to upload a spreadsheet file of co ordinates to the software or manually enter a set of co ordinates via the control on the Arbitrary scan tab Only X Y Z co ordinates are supported The co ordinates file should be a tab delimited
33. to continue 3 Position information Measurement config 4 System configuration i Pi Bum Ur Ultrasound Measurement System Control Centre 7 Exit RECISION ACOUSTICS LTD FIGURE 2 OPENING PAGE OF UMS SOFTWARE INTERFACE 1 Status indicators The status LEDs indicate when the system is either moving or processing a command The third smaller LED indicates whether the z axis of the system is vertical When neither LED is lit the system is idle 2 Temperature The lt Temperature gt control indicator is used to display the current water temperature If UMS has been configured to work with a temperature measurement device e g thermocouple then the current measured temperature is displayed If no thermocouple is available the control defaults to 22 C If the water temperature is known to the user i e through some external thermometer it can be manually entered into the control Subsequent temperature dependant calculations will then use the entered value 3 Position information The lt Position gt control displays the current position of the moving axes along with an indicator showing whether the system is operating in relative co ordinate mode i e positions given relative to startup position or absolute mode i e positions given relative to an absolute reference within the tank More about the available co ordinate systems is given in the section Definition of Axes lt Update position gt allows th
34. trol centre software is pre installed on the host PC supplied with the test tank system Should you need to reinstall the software at any point in the future an installation disk is supplied with the system For installation instructions please see the readme file on the installation disk CONNECTING EXTERNAL DEVICES The UMS control centre software is designed to operate the UMS test tank system incorporating a digital storage oscilloscope DSO The system can also be used to control several models of HP Agilent function generators a thermocouple and an optional 2 rotational axis transducer mount Prior to running the software ensure that the UMS system and any peripherals are connected to the host PC and powered up as described in the UMS system manual EMERGENCY STOP SWITCH E STOP The UMS comes complete with a hardware emergency stop switch This latching push button switch when activated cuts power to all of the system stepper motors and causes the system to halt motion immediately The consequences of pressing the ESTOP are as follows 1 Power is immediately cut to the stepper motors on the linear axes and if applicable the stepper motor controlled rotary table a Logic power supply to the stepper controllers and encoders is maintained allowing the system to maintain a record of its position Precision Acoustics Ltd Hampton Farm Business Park Higher Bockhampton Dorchester Dorset DT2 80H UK t 44 0 1305 264
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