General Info - GSE Rentals
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1. Accuracy Absolute accuracy is invariably limited by the accuracy with which the speed of sound in the water column and sub bottom is specified For more detailed information on this refer to document D101 02251 Rev4 1 Cable Length The standard cable length as quoted is 10m Longer cables are available as options Heave Compensation Pinger has the ability to correct for heave but not pitch and roll All three can be recorded but compensation is only done for the heave Remote Operation The Pinger SBP is controlled by Knudsen EchoControl software which is set up as a Client Server architecture The server side application EchoControlServer exe runs on the host PC the one physically connected to the sounder and communicates with the Pinger Dry End using the USB interface The client side application EchoControlClient exe can run on either the same host PC as the server side stand alone option or on another PC on the same network multiple PC option The client side application allows the user to control the echosounder display full echogram data on the PC monitor capture signal data perform standard depth logging and record in real time to a thermal printer Data Output and Format There are four possible output file formats KEB Binary Knudsen Proprietary SEG Y KEA ASCII configurable and XTF Any combination of available formats can be recorded simultaneously Additional information on data output as well as file2. is further recommended that the transducers be mounted 1m or more below the water surface but this is not always feasible given certain installations and survey areas When operating the transducer extremely close to the water surface wet end only partially immersed for example there is a possibility that the low hydrostatic head at the radiating face may result in cavitation at high transmit power levels This would degrade both transmit power and receive sensitivity and can even damage the transducers Connector Grease The connectors should be lubricated with Molykote 44 Medium before every mating Refer to SubConn Handling Instructions for additional information link provided below http macartney com sites default files SubConn 20handling 20instructions pdf Dry End Power Supply An AC DC 24V converter is supplied with the system For battery hook ups we recommend that they be connected to output 24V This not only keeps the current lower but results in increased efficiency of the dry end Power Requirements Start up impulse 72W 3A at 24Vdc Quiescent standby 18W 0 75A at 24Vdc Operating nominal 36 W 1 5A at 24Vdc Operating max 66W 2 75A at 24Vdc Control Computer Requirements Any new commercial laptop over 500 should work just fine We recommend a minimum of 2GB SDRAM however With all of our new systems peripherals such as GPS and Heave connect through the host computer Toughbooks are attracti
3. peripherals such as GPS and Heave connect through the host computer If the laptop does not have a serial port an RS 232 to USB adapter will likely be required A 4 to 1 Serial to USB converter that we have tested and are familiar with is Model US9ML2 4 from B amp B Electronics Wet End Mounting Options Pinger is typically mounted in one of two ways described below Photos are available upon request Option 1 Seamless pipe fitted to mounting post The stem coming out of the top of Pinger is sized to fit inside NPS 1 25 SCH 40 pipe Drawing D101 05189 Rev2 available upon request illustrates the required pipe dimensions and hole cutout specification Option 2 Flange on pole Put a flange on the top of a short stub that fits over the center post and then D101 05550 Rev1 6 Pinger Technical Information ae weld or bolt a matching flange on the end of your over the side pole Drawings D101 05446 Rev1 and D203 05400 Rev1 available upon request provide details on the flange Transducer and Pipe Support from force of water while boat is underway One approach is to attach a line rope cable chain etc to the mounting pole itself as far down as possible close to the top of the fairing Drilling a hole through the pipe and installing an eye bolt is a simple and secure way to connect the line Transducer Installation Depth At minimum the Pinger wet end must be fully submerged and clear of turbulent water and air bubbles It
4. the 3 5kHz configuration Secondary Channel 200kHz The default bandwidth is10 kHz linear FM sweep of 195kHz to 205kHz Bandwidths up to 20kHz can be set in software Pulse Width ms Primary Channel 15kHz 0 0625ms 0 125ms 0 25ms 0 5ms 1 0ms 2 0ms 4 0ms 8 0ms 16 0ms 32 0ms 64 0ms Primary Channel 3 5kHz 0 0625ms 0 125ms 0 25ms 0 5ms 1 0ms 2 0ms 4 0ms 8 0ms 16 0ms 32 0ms 64 0ms Secondary Channel 200kHz 0 0625ms 0 125ms 0 25ms 0 5ms 1 0ms 2 0ms 4 0ms Pulse Rate pulses per second The maximum pulse repetition rate is 20 Hz This ping rate can be set in software but is also dependent on the size of the acquisition window pulse length and default duty cycle up to 10 Three things affect the final ping rate of the Echosounder the Range or more precisely maximum acquisition window depth the transmit Pulse Length and the Ping Rate Control set via the EchoControl application The system will only ping as quickly as is feasible based on the limitations imposed by these various conditions Range Once a ping is transmitted the system listens for a received pulse for a time equivalent to the two way travel time of the maximum acquisition window depth For a 100m end depth and assuming speed of sound to be 1500m s this works out to 0 13 seconds Pulse Length The version of software being used on the Pinger Shallow Water SBP has a built in 10 Duty Cycle limit imposed So for a 64ms pulse the time b
5. D101 05550 Rev1 6 Pinger Technical Information Primary Frequency kHz The Pinger Wet End includes two separate interchangeable projectors a low frequency 3 5 kHz projector ideally suited for hard sand bottom and a 15 kHz projector for soft mud sediments Primary Frequency Electrical Pulse Power kW Up to 2kW 1 kW typical Primary Frequency Source Level dB 15kHz configuration Peak transmit voltage response of 157 5dB 3 5kHz configuration Peak transmit voltage response of 149 0dB Beam width 3 dB deg Directivity is provided by the combined effects of transmit and receive aperture In most cases these are the same since the same transducer is used for both transmit and receive The innovative Pinger SBP still uses conventional ceramic transducers as projectors but it incorporates a separate large aperture receive transducer providing directivity at a fraction of the weight 15kHz configuration Beam width ranges from 18 deg to 9 deg over the typical frequency sweep 3 5kHz configuration Beam width ranges from 94 deg to 23 deg over the typical frequency sweep Secondary Frequencies kHz The 200kHz high frequency channel provides a top of bottom reference Bandwidth Chirp Sweep kHz Primary Channel 15kHz The default bandwidth is10 kHz linear FM sweep of 10kHz to 20kHz Primary Channel 3 5kHz The default bandwidth is 6 kHz linear FM sweep of 2kHz to 8kHz An 8kHz chirp sweep of 2kHz to 10kHz is also common for
6. etween pings is limited to 0 64 seconds regardless of the maximum window depth D101 05550 Rev1 6 Pinger Technical Information a E Ping Rate Control This is a control within the user interface allowing the transmit interval to be set The user can adjust this ping rate to the optimal value for the application The echosounder will then ping at this rate if possible built in ping rate limitations as detailed above may override the basic value selected Depth Rating m Pinger is designed specifically for shallow water sub bottom profiling 4m up to 300m and is intended for a simple over the side pole mount installation and not to be deployed as a towed fish Range m High resolution echogram data for the entire water column set by user up to 300m is recorded at all times The control software allows for dynamic window positioning and sizing as set by the operator Sediment Penetration m Penetration is dependent not only on signal properties such as frequency but many external factors primarily local sediment properties and to a lesser extent the depth of water Because of this it is extremely difficult to predict and specify the amount of usable penetration achievable for each specific survey area Sample data for both 3 5kHz in hard packed sand and 15kHz muddy bottom are shown in Figures 1 through 5 of this document Additional data is available upon request Range Vertical Resolution cm assuming speed of so
7. format specifications can be found in the User Manual D101 05517 available upon request Real Time Data Export There are various data logging output formats available ranging from a configurable user defined format to industry standard protocols The data can be output over serial ports RS 232 RS 422 or over Ethernet 10 100 LAN UDP Broadcast Refer to 101 05372 available upon request for additional details All data can be stored with position and time PC s time at time of recording Supporting External Data Input Pinger interfaces to peripheral devices such as GPS receivers and heave sensors through the host PC s serial typically RS 232 ports The SounderSuite software which runs on the host PC is set up to support a number of peripheral devices These include GPS Receivers NMEA GGA GLL and GMP Heave Sensors TSS1 and TSS3 formats POSMV EM1000 and EM3000 formats and Seatex MRU D101 05550 Rev1 6 Pinger Technical Information zA SVP and Temperature Profiles A fixed speed of sound can be manually entered through the EchoControl graphical user interface Event Marks Compliant Event marks can be initiated from a number of sources Event Annotation application parameters can be defined through software Data Logging When recording is enabled the selected data output formats are recorded to a user specified location on the control PC Dimensions Dry End Length 488 mm Width 386 mm Height 185 mm Wei
8. ght 10 5kg Dimensions Wet End Length 864 mm Width 514 mm Height 381 mm Weight 21kg 15kHz option 29kg 3 5kHz option D101 05550 Rev1 6 Pinger Technical Information Data acquired with Knudsen PINGER _ Chirp Sub bottom Profiler inva slant sone i Data acquired with Knudsen PINGER _ Chirp Sub bottom Profiler St Petersburg Pier Penetration of 35 ft in sand St Petersburg Florida USA Figure 2 3 5kHz 6 9m water depth 11m penetration in hard packed sand Goon ae iy Figure 3 15kHz 20 ate 30m water depth 25m penetra W i tion in glacial lake soft sediment D101 05550 Rev1 6 Pinger Technical Information 6 a a K k ae ia a i thie oy ty Figure 4 15kHz 20 30m water depth 25m penetration in glacial lake soft sediment D101 05550 Rev1 6 Pinger Technical Information os
9. und to be 1500m s Primary Channel 15kHz Theoretical range resolution of 7 5cm for typical frequency sweep Primary Channel 3 5kHz Theoretical range resolution of 12 5cm for typical frequency sweep Theoretical vertical resolutions less than 10cm are achievable Secondary Channel 200kHz Bandwidths up to 20kHz giving theoretical vertical resolutions of 3 75cm are achievable Sync Control The SYNC IN signal is a 5V tolerant input that is internally pulled up to 3 3V The signal is edge triggered high to low and should be more the 1ms but less than 50ms in duration The Pinger will initiate a transmit and acquisition cycle within Ims of receipt of the sync signal assuming it is ready to ping at the time of receipt The SYNC OUT signal is 3 3V and Ims in duration commencing at the start of each ping cycle Knudsen systems have been synced to multibeams in the past Interference Pinger has a 200kHz high frequency element that is used as a top of bottom reference This channel can be configured such that the Pinger system does not pick up any interference from other sonar equipment such as multibeam systems Concerning whether or not the Pinger 200kHz signal will show up in multibeam records that question is better suited for the multibeam manufacturer To eliminate any potential for crosstalk there is an option to turn the high frequency channel off and acquire only low frequency data Peripherals With all of our new systems Pinger included
10. uty cycle D101 05550 Rev1 6 Pinger Technical Information JAS Hull Mounting Pinger was designed for over the side pole mounting applications but hull mounting is a possibility The simplest way to hull mount Pinger would be to put a flange on the top of the shortest possible stub attached to the centre post angle the flange to match the angle of the hull at that point and weld or bolt it on Also a through hull penetrator would be required for the cable The assembly could be installed by a diver without too much difficulty In this configuration the system would not require any regular servicing There are of course other ways to hull mount Pinger that are more involved We can forward on alternative thoughts and comments but a naval architect or someone more familiar with the vessel may be better suited to provide suggestions for a permanent mounting solution Digitized Depth Recording The 200kHz data channel on the Pinger SBP can record digitized depths to an ASCII data file format KEA along with other user selected data fields if desired The enabling of the available data fields is user selectable but the ordering of the data fields is not user selectable The 200kHz data channel s digitized depth data can also be sent to an external data logger system via the serial or UDP interfaces Refer to document D101 05372 Rev1 1 for information about the message formats supported The same feature is available for the low frequency channel
11. ve because they typically have built in serial ports whereas most other modern laptops do not If the laptop does not have a serial port then a USB to COM adapter or network to COM adapter is required SBP BATHY Switch The Pinger system is equipped with an SBP BATHY switch that can be toggled at the dry end inside panel The standard operational mode for the Pinger with the PVDF array is with the switch set to SBP mode When the switch is set to BATHY mode the PVDF receiver is bypassed and the received signal comes via the transducer as is standard in normal survey systems The advantage of the separate receive array in SBP mode is most apparent in shallow water conditions where the ringing of the transducer in normal BATHY operations would overpower and mask the desired sub bottom details The SBP mode through the PVDF has also been equipped with additional signal amplification to provide stronger signal levels to pull out weak layers in the sub bottom details Boat Speed Range The hydrodynamic design of the Pinger Wet End allows for data acquisiton at boat speeds as high as 10 kts installation dependent That said the recommended survey speed is in the 6 kt and less range With sub bottom profilers it is advantageous to acquire a high density of data points along the survey line Increasing the number of along track data points can be accomplished by both travelling at slower boat speeds and taking advantage of the Pinger systems high 10 d
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