Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1987-02-02
1989-07-18
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
250227, 356345, 356351, G01B 902
Patent
active
048489069
ABSTRACT:
An all fiber optic hydrophone or sensor array has significant size, cost, reliability, and operational advantages over other hydrophone arrays. The array comprises a distributed network of appropriately coiled optical fiber encased in commercially available marine cable. The terminal end of the sensor array preferably contains a modulated miniature solid-state laser diode and photodetector matrix which mate to power and multiplexing electronics. The distributed sensor assembly itself is entirely passive. The hydrophone array comprises an optical signal source and at least one transmitting optical fiber for guiding signals output from the optical signal source. The array further includes a plurality of sensing interferometers coupled to the transmit optical fiber and means for measuring differential changes in the optical path of each sensing interfereometer. The hydrophone array comprises means for superimposing signals output from each sensing interferometer, and a detector for converting optical signals in the receive fiber into electrical signals. The signal processing system in the array includes a compensating interferometer having optical phase modulating means formed in one arm thereof.
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Koren Matthew W.
Litton Systems Inc.
Willis Davis L.
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