Optical system for detecting acoustic wave energy in a fluid med

Details Optical system for detecting acoustic wave energy in a fluid med Optical system for detecting acoustic wave energy in a fluid med

1985-09-18

1987-08-18

Kyle, Deborah L.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367140, 250231P, 350 963, 356345, H04R 102, G01B 902

Patent

active

046882006

ABSTRACT:
An optical sound source signature transducer system for use in marine seismic exploration in which coherent radiation from a laser is coupled to unequal length optical paths exposed to modulation by the acoustic energy wave generated by the sound source. The reflected beams from the paths are crosscoupled to generate interference fringes in two output beams out of phase with each other. The fringes in one output beam are counted in an up/down counter to determine the magnitude of the pressure as a function of time. The direction of the pressure change is determined by examination of the phase relationship between the fringes in the output beams. Peaks and valleys in the pressure are detected as phase reversals between the fringes in the output beams be detecting the beginning and end of a fringe in one beam without detecting the beginning or end of a fringe in the other beam therebetween. The direction of counting of the counter is reversed upon detection of a peak or valley in the modulating pressure to maintain the count as an accurate representation of the magnitude of the pressure.

REFERENCES:
patent: 4162397 (1979-07-01), Bucaro et al.
patent: 4422167 (1983-12-01), Shajenko
patent: 4556319 (1985-12-01), Gauert et al.
Moore et al., Fiber Optic and Laser Sensors II, SPIE, 5/84, pp. 12-14 and 17.

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