Sensing instrument helps with underwater surveys
A
Tinsley product story
Edited by the Engineeringtalk editorial team
Sep 6, 2001
Precision instrument specialist H.Tinsley has introduced a submarine cable survey system for use by divers working in areas where it may not be practical to use a remotely operated vehicle
Precision instrument specialist H.Tinsley has introduced a submarine cable survey system for use by divers working in areas where it may not be practical to use a remotely operated vehicle (ROV).
Rated to work in depths up to 50m, the unit uses an applied low frequency tone to locate cables buried beneath the seabed and also establishes their actual burial depth.
The hand held sensing unit has been designed for maneuverability under water.
An audio output helps the diver to position the sensing unit in an area where the highest signal level is received, corresponding to a point directly over the cable being surveyed.
Once the cable is precisely located the sensing unit is placed on the seabed at that point and a measurement of burial depth can then be made.
An umbilical cable connects the sensing unit to a microprocessor-based shipboard display unit that displays the data received from the sensor.
Some special functions are incorporated in the display unit.
A spectrum analyser identifies any areas of the usable frequency range of the survey system that exhibit a particularly high level of electromagnetic interference, this frequency can then be avoided while cable surveying in that particular geographical location.
Digital filtering of the input signal ensures the instrument displays clear and unambiguous results.
Electronic tuning enables the system to precisely detect the frequency of the tone applied to the cable.
Any standard electroding generator operating within the frequency range 16 to 100Hz can be used with the system but, if required, Tinsley can supply suitable equipment such as its model 5915.
Alternatively, the electroding function of the Tinsley 5910 submarine cable test set could be used to energise the cable.
Other features include an RS232 computer interface, integral test facility, GPS data input, and an oscilloscope function for analysis of received signals.
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