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Re: Could you recognize the lump?

Posted by Ross McNeill on Sat Dec 28, 2002 06:43:50 PM

In reply top Could you recognize the lump? posted by bdk on Sat Dec 28, 2002 06:15:28 PM

Sub-bottom sonar is possible but you need a narrow beam, low frequency device.

The bulk of the signal is reflected from the water/mud interface but a small proportion passes through the mud to be reflected at the mud/rock interface.

The electronic gubbins is where the clever bit of the different speed of sound (Water/Mud/Water) is factored and a display of sub-bottom produced.

Normal "fish finder" units work on too high a frequency and too wide a band for this task.

An internet search on "Sub-bottom profilers" will bring up a few hits with expanded technical information.

Regards
Ross

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