WIX Archives
Excellent tip! Thank you...(ntx)
Posted by bdk on Sun Dec 29, 2002 08:20:59 PM
In reply top Re: Could you recognize the lump? posted by Ross McNeill on Sat Dec 28, 2002 06:43:50 PM
: Sub-bottom sonar is possible but you need a narrow beam, l
: ow frequency device.
:
: The bulk of the signal is reflected from the water/mud int
: erface 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 diff
: erent speed of sound (Water/Mud/Water) is factored and a d
: isplay of sub-bottom produced.
:
: Normal "fish finder" units work on too high a frequency an
: d 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