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© GeoAcoustics
2008
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GeoChirp II Specifications
Transmitter
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Frequency Range: |
0.5kHz to >13kHz programmable |
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Power Output: |
10W to >4kW user programmable |
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Source Level: |
up to 205dB
±3dB
re 1uPa@1m |
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Pulse Length: |
Typically 32ms, programmable sweeps (or user defined pings) |
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Pulse Shading: |
Full amplitude control |
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Pulse Repetition Rate: |
4
pulses per second maximum for 32ms chirp sweep
10 pulses per second for pinger waveforms |
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Protection: |
Open and short circuit protected |
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Efficiency: |
Greater than 90% |
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Beam Width: |
55°
at 3.5kHz. 40°
at 5.0kHz. 30°
at 7.0kHz (4 Transducers) |
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Trigger: |
Isolated TTL |
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Control Interface: |
Isolated RS232 bi-directional (3 wire) |
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DC Power Supply: |
200VDC to 400VDC |
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Transmit Transducers: |
4
x T135 Wideband |
Receive Hydrophone Sections
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Frequency Range: |
200Hz to 25kHz Wideband |
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Sensitivity: |
-205dB
±3dB
re 1V/uPa |
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Pre-amp Filter Type: |
High/Low pass 4th order linear phase |
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Output: |
Differential signal 50 Ohm |
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Noise: |
<3nV/√Hz |
Signal Conditioning
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Gain: |
Full TVG control up to +80dB |
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Cable Driver interface: |
Up to 10km of 11mm single armoured coaxial cable Rochester A302799 or
equivalent |
System Performance
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Resolution: |
6cm using 0.5 to 13.5kHz chirp |
Mechanical
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Dimensions: |
Subsea unit, 403mm L x 103mm D
Transmit transducers, 184mm x 184m x 267mm H |
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Weight: |
Subsea unit, 11kg in air, 6kg in
water
Transducers (each), 11kg in air, 6kg in water |
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Depth rating: |
Subsea unit, 3000m standard
Transmit transducers, 1000 m standard |
Specifications subject to change
without notice.
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