Towed array strain-sensing noise canceller

Details Towed array strain-sensing noise canceller Towed array strain-sensing noise canceller

1981-09-09

1996-07-02

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367130, G01S 380

Patent

active

055329799

ABSTRACT:
Method and apparatus are disclosed for reducing breathing-wave induced no in a liquid-filled elongate hose housing a hydrophone array. The arrangement involves sensing radial strain induced in the hose wall by the breathing waves (created as the hose is drawn longitudinally through water) and subtracting a multiple of the sensed value thereof from the array hydrophone output. Arrangements for measuring the breathing-wave-induced wall strains include (1) relative phase shifts in light passing through the sensing arm of an optical fiber interferometer, and (2) signal currents generated from piezolectric polymer both of which are disposed inside the hose wall surrounding a hydrophone.

REFERENCES:
patent: 3860899 (1975-01-01), Watlington et al.

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