Sub-bottom Profilers

GeoPulse Compact Sub-Bottom Profiler

Compact sub-bottom profiler

The GeoPulse Compact is a high performance digital sub-bottom profiler. Depending upon the survey task the user can choose waveforms in the frequency band of 2-18kHz, thus optimising resolution and sub-seafloor penetration.

GeoAcoustics Ltd

Great Yarmouth, GB

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Description

Technology

GeoPulse Compact is a technically advanced sub-bottom profiling system. Its digital processing and waveform selection technology enables the appropriate pulse-shape, power signature and configuration to be selected for the job in hand, whether it’s mapping the geology in deep oceans or determining mud thickness in a silted harbour. The new GeoPulse Compact system combines the best features of continuous wave (Pinger) type systems and frequency modulated pulses in a unit which requires only 11% of the power requirements of previous systems. The system utilities very low noise, state of the art, ADC and amplifier technology. Massive oversampling of the raw signals (800kHz), combined with advanced FPGA based decimation and processing allows the receivers to achieve over 100dB of noise free dynamic range.

System Components

The system is operated directly from a computer using the supplied GP1000 software, which interfaces to the deck unit via Ethernet. The sonar electronics are mounted close to the transducers in all deployment options and the signal is transmitted to the deck unit via a lossless digital connection. Data is acquired with the transmit transducer and with a fixed hydrophone, allowing the operator to use the best signal for the job at hand.

Deck Unit

The Deck Unit receives serial inputs from GNSS as well as a PPS input. The deck unit interfaces to the towfish through a soft tow cable. Power is supplied by a 10-30V dc connection allowing the system to be operated from battery power on small vessels.

Sub-Sea Electronics

The waterproof electronics module is manufactured in aluminium and is rated to 1000 metres water depth. Its internal electronics generate and transmit the waveforms selected by the user. The return signals are received either from the integrated hydrophone or from the transducer and are instantly digitised prior to being routed to the Deck Unit via an ADSL link.

Transducers and Hydrophone

The transducer is a double resonant stack design which operates efficiently over a wide frequency band of 2 - 18 kHz and has a flat response over the range 5-18 kHz.

The integrated single channel hydrophone utilises 7 high-spec elements to capture the return signal and route it via an inline preamp to the subsea electronics where it is digitised.

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Specifications

Towfish: Weight in air [kg]

32

Dimensions

1000 mm (L) x 404 mm (W) x 322 mm (H)

Mode of operation: Platform type

Hull Mounted, Side Mounted, Pole Mounted, Surface Towed

Signal composition

Broadband, Chirp, Single Frequency

Min. frequency [Hz]

2000

Max. frequency [Hz]

18000

Power output [W]

1000

Frequency

Wide band

Max. penetration [m]

30m (Sand), 80m (soft clay)

Connectors

3 x Serial, Power in, Deck cable to system / cable winch, PPS, External trigger

IP rating

IP66

Programmable source signatures

Pinger: Any frequency can be selected between 2KHz – 18KHz in 0.1Khz. Any number of cycles between 1 – 32 can be selected for any of the frequencies above. Ricker: Any frequency can be selected between 2KHz – 18KHz in 0.1Khz steps. Any number of cycles between 1 – 32 can be selected for any of the frequencies above. Chirp: There at over 10 Chirp waveforms available at sweeps of 5Hz, 10kHz and 15kHz. So a chirp sweeps of 2kHz – 7kHz, 2kHz – 12kHz and 2kHz – 17kHz can be selected for example.

Source Level

up to 196dB ±3dB re 1uPa@1m

Min. depth of operation [m]

1

Max. depth of operation [m]

100

Max. resolution [m]

0.05

Cable length

Up to 500m

Hardware/software requirements: Operating System

64-bit Windows 7 or 10

RAM memory [GB]

8 GB

Graphics

DirectX 9 Compatible Graphics card supporting Shader Model 2.0

General: Application

High Resolution

Power type

DC

Portability of logger

Portable

Operating temperature: max. [°C]

50

Operating temperature: min. [°C]

-5

Humidity

10% to 95% RH, non-condensing.

Transducer weight [kg]

24

Transducer length [m]

0.9

Transducer width [m]

0.2

Transducer height [m]

0.3

Power requirements

10-30V DC 30W

Size (Deck unit)

350mm(L) x 268mm(D(Excluding connectors)) x 103mm(H)

Weight (Deck Unit)

7 kg

Product type

Sub-Bottom Profiler

Year of initial development

2018

Max power consumption [W]

30

Height of logging unit [m]

0.103