Seismic sensor with interferometric sensing apparatus
First Claim
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1. Apparatus for interferometric sensing comprisinga. a broadband optical source;
- b. a detector; and
c. an optical path between the source and the detector, the optical path including;
i. a depolarizer in the path for depolarizing optical radiation emitted by the broadband optical source, ii. a matched interferometer in the path to receive optical radiation from the source, and iii. a sensing interferometer to receive optical radiation from the matched interferometer, the matched interferometer including a phase modulator, and wherein a first optical path length difference in the sensing interferometer is approximately equal to a second optical path length difference in the matched interferometer.
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Abstract
An interferometric sensor includes a broadband optical source, a depolarizer for depolarizing optical radiation emitted by the broadband optical source, a matched interferometer, a sensing interferometer, and a detector. The matched interferometer contains a phase modulator. The sensor is configured so that the optical path length difference in the sensing interferometer is approximately equal to the optical path length difference in the matched interferometer.
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Citations
36 Claims
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1. Apparatus for interferometric sensing comprising
a. a broadband optical source; -
b. a detector; and
c. an optical path between the source and the detector, the optical path including;
i. a depolarizer in the path for depolarizing optical radiation emitted by the broadband optical source, ii. a matched interferometer in the path to receive optical radiation from the source, and iii. a sensing interferometer to receive optical radiation from the matched interferometer, the matched interferometer including a phase modulator, and wherein a first optical path length difference in the sensing interferometer is approximately equal to a second optical path length difference in the matched interferometer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. Apparatus for a seismic streamer comprising
a. a broadband optical source; -
b. a detector;
c. an optical path between the source and the detector, the optical path including;
i. a matched interferometer in the path to receive optical radiation from the source, the matched interferometer including a phase modulator, and ii. a plurality of sensing interferometers each comprising a plurality of optical fiber hydrophones positioned along an optical fiber having Bragg gratings positioned at either end of the optical fiber, the sensing interferometers arranged to receive optical radiation from the matched interferometer, and wherein a first optical path length difference in the sensing interferometer is approximately equal to a second optical path length difference in the matched interferometer. - View Dependent Claims (33, 34, 35, 36)
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Specification