A PORTABLE, GENERAL-PURPOSE UNDERWATER SOUND MEASURING SYSTEM.
Research and development rept. Jan 65-Jul 66,
NAVAL UNDERSEA WARFARE CENTER SAN DIEGO CALIF
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A portable underwater sound-pressure measuring system was developed and tested. The system was shown to be capable of measuring very low ambient-noise levels. High self-noise levels at frequencies less than 50 to 63 Hz are likely to be present if measurements are made from a drifting ship, and the cable is towed at drift velocity, probably because of a combination of flow noise and noise arising from cable vibrations. These high self-noise levels can be satisfactorily eliminated by using a slack cable system as described in the report. Author
- Electrical and Electronic Equipment