Acousto-optical device for removing bubble pulse from reflected

Details Acousto-optical device for removing bubble pulse from reflected Acousto-optical device for removing bubble pulse from reflected

1978-01-26

1979-07-31

Moskowitz, Nelson

Communications: electrical

Selective

Having indication or alarm

340 155VD, 343100CL, 324 77K, G01V 138, G01V 128

Patent

active

041632052

ABSTRACT:
Processing of electrical signals representative of incident and reflected acoustic signals generated by underwater explosion and comprising primary and secondary impulse, or bubble pulse, peaks. Acousto-optic diffraction and optical Fourier transform of the primary or explosive incident signal is performed and photographically recorded to provide a bubble pulse spatial filter. The filter is used in performing subsequent acousto-optic diffraction and optical Fourier transforms to derive impulse response, bottom loss, and an output electrical signal representative of the reflected signal, without the bubble pulse.

REFERENCES:
patent: 3737573 (1973-06-01), Kessler
patent: 3872293 (1975-03-01), Green
patent: 3984802 (1976-10-01), Lippel et al.
patent: 4054878 (1977-10-01), Diehl
Jackson, "Diffractive Processing of Geophysical Data", pp. 419-427, Applied Optics, vol. 4, #4, 4/65.
Maker et al., "Large Time Bandwidth . . .Matched Filter", 6/74, pp. 1342-1344, Applied Optics, vol. 13, #6.

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