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GeoPulse Profiler
The GeoPulse Sub-bottom Profiler is a tried and
tested, industry standard sub-bottom profiling system for shallow geophysics. It
is highly flexible allowing operation as either a hull mounted deep water system,
an "over-the side mount" system for small boat operations or as a towed system.
The Transmitter (Model 5430A) allows control of the output power,
frequency and the number of full cycles included in the outgoing pulse.
Seabed returns can be conditioned by analogue means using the GeoPulse
Receiver (Model 5210A) or digitally using a wide range of third party
processing systems.
 Data from the GeoPulse Receiver (Model 5210A) can
be displayed directly onto a wide range of industry standard
graphic recorders. The GeoPulse Profiler is often used
in combination with our Dual Frequency Side Scan sonar.
Basic System
The basic system includes the following:-
The four transducer Model 136 Towfish provides a stable sub-tow survey
platform, which may be towed down to 600 metres using a standard 2000 metre
armoured tow cable. Alternative deployment options for the profiling
transducers are:
- Hull Mount - Can be configured with up to 16
transducers providing a narrow bean pattern for deep water operation,
whilst still achieving a good penetration.
- Over-the-side Transducer Mount
(Model 132) - It is possible to use the system in very small boats for
river, harbour or shallow lake surveys and also bridge scour
investigations.
Transmitter Model 5430A
- Output power continuously adjustable to 10kW.
- 2-12 kHz frequency range, operator selectable
with front panel dial.
- Pulse length selected by number of cycles to
improve efficiency of transducers and reduce “ringing”.
- Transmit repetition rate controlled externally
or internally, operator selectable.
- Internal switch 115/230 VAC operation. Unit is
protected against damage caused by improper line voltage.
- Impedance matching switch allows operation with
single or multiple transducer arrays.
- Separate/Combined Switch to transmit on portion
of transducer array and receive on remaining portion or to modify beam pattern
of transducer array.
- Indicators to easily monitor all system parameters.
Receiver Model 5210A
- Combined TVG and operator controllable gain provides
up to 100dB of active gain for low amplitude signal processing.
- Automatic bottom tracking provides constant TVG adjustment
regardless of bottom variation or degree of slope (manual TVG is also
a standard feature).
- AGC provides operator with the ability to manipulate
receiver sensitivity for a given reflector intensity.
- Key program: Multiply and divide-by functions
for source triggering flexibility in deep water or extremely shallow water.
- The tape interface allows for recording of either
raw or processed data. Eliminates costly interface devices and provides calibration
signal for proper recorder adjustment.
- Optic isolation between receiver and source power
supply prevents ground loop interference on acoustic record.
- TVG record annotation: Upon switch closure by
operator or by Nav interface, places a mark at every 6dB point throughout TVG
ramp on record.
- Compensates for spreading and attenuation losses
through the water column in deep water.
- All gain controls, manual or TVG, are in fixed
increments enabling relative reflectivity of different areas to be compared.
- Signal output to tape recorder is displayed by
LED’s signifying maximum possible dynamic range or presence of "clipping".
- Data can be displayed directly onto a wide range of industry standard
graphic recorders.
Towed Transducer Vehicle Model 136A
The Model 136A Fish is the workhorse of the GeoAcoustics
profiling systems. It has logged more survey kilometres and more pipeline crossings
than any other profiling vehicle in the world. Its design allows for stable, noise-free
towing in high seas and at speeds up to 12 knots. The rugged galvanised body and
fibreglass cowling, provides protection for four profiling transducers and will
stand up to the punishment encountered at sea. Standard options available for the
136A Fish include side scan sonar transducers to allow simultaneous profiling and
side scanning from one vehicle.
Hull Mounted Transducer Array Model
134
A hull-mounted array is ideal for a dedicated survey
ship and deep water, yet is often used for short jobs in all water depths. A few
of the advantages are:
- Construction of a sea chest and installation
of transducers is simple and rapid, eliminating the need for dry-docking or building
a window in the hull.
- Collect data at sea with the flick of a switch.
No winches or towcables.
- Large number of available transducers (up to
16) and a switching connector allow for very high source levels and varying beam
patterns to optimise operation for water depth and ship motion.
The GeoAcoustics Model 134 has been installed by
survey companies, government agencies, research institutes, and many others. It
has been proven through years of operation to be the most versatile, simple to operate,
and cost effective profiler available.
Over-the Side Transducer Mount Model 132B
The 132B transducer array is specifically designed
for small boat operation at lower speeds. The transducers are mounted on a plate
at the end of a vertical, gimballed staff. The staff, in turn, is supported by a
mounting pad, which can be fastened to either the deck of the boat, or to an athwart-ships
timber. The gimballed unit relieves excess strain on the mounting pad and provides
freedom of motion fore, aft, and athwart-ships to ensure the transducer beam remains
directed at the sea floor despite motion of the vessel.
Features
- Suitable for a wide range of survey vessels.
- Hydrodynamically faired cowling allows surveying
at up to 5 knots.
- Hard coat anodised components allow for years
of maintenance-free operation.
Detailed
Specification
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