Interferometric sonar in non-linear acoustics

Details Interferometric sonar in non-linear acoustics Interferometric sonar in non-linear acoustics

1983-10-12

1986-06-17

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Parametric sonar

367105, G01S 1587

Patent

active

045960070

ABSTRACT:
An interferometric sonar in non-linear acoustics for high-resolution observations of objects located in the vicinity of the sea floor includes two end transducers for simultaneous transmission at two high frequencies F.sub.1 and F.sub.2 of the order of 200 kHz. Reception is performed by hydrophones placed between the sending transducers at the low frequency F.sub.2 -F.sub.1 of the order of 20 kHz. Angular channels are formed during two transmission sequences. Transmission takes place in phase at the frequency F.sub.2 -F.sub.1 in one sequence and in phase opposition in the other sequence in the case of the two sources generated by non-linear effects.

REFERENCES:
patent: 3613069 (1971-10-01), Cary, Jr.
patent: 3716824 (1973-02-01), Dorr et al.
patent: 3786405 (1974-01-01), Chramiec et al.
patent: 3824531 (1974-07-01), Walsh
patent: 4081783 (1978-03-01), Honda
patent: 4234939 (1980-11-01), Grall

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