© GeoAcoustics 2008

GeoPulse Pipeliner

The GeoPulse Pipeliner is a specialised variant of the GeoPulse Profiler designed to provide a solution to the problem of detecting buried pipelines.  It includes added flexibility to allow users to select from a wider choice of frequencies.  The towfish transducer layout is configured to give the perfect acoustic “footprint” for pipe detection.

Basic System

The basic system includes the following:-

• GeoPulse Transmitter (Model 5430P)
• GeoPulse Receiver (Model 5210A)
• Towfish (Model 136P) containing
• Profiling Transducers (2 x Model T135, 1 x T14)

The Model 136P Towfish houses the 3 transducers and provides a stable sub-tow survey platform, which may be towed down to 600 metres using a standard 2000 metre armoured tow cable.  An alternative deployment option for the profiling transducers is our Over-the-side Transducer Mount (Model 132P), which makes it possible to use the system in very small boats for river, harbour or shallow lake surveys.

Transmitter Model 5430P

• Output power continuously adjustable to 5kW.
• 2-12 and 14kHz frequency range, operator selectable with front panel dial/switch.
• 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 136P

The Model 136P 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 three profiling transducers and will stand up to the punishment encountered at sea. The two low frequency and one 14kHz transducers are configured to give a wide beam pattern in the fore/aft direction to aid pipeline detection.

Over-the Side Transducer Mount Model 132P

The 132P 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

Data Sheets & Downloads