Method and system for optical fiber sensing
First Claim
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1. A method of optical sensing, comprising:
- coupling an excitation optical signal into a first optical fiber to induce Rayleigh backscattering, thereby providing a backscattered signal;
coupling said backscattered signal into a second optical fiber, spatially separated from said first optical fiber; and
optically amplifying said backscattered signal in said second optical fiber, thereby generating a sensing signal;
wherein said optically amplifying comprises introducing a pump light beam into said second fiber, wherein said pump light beam and said backscattered signal enter said second fiber from the same end thereof.
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Abstract
A method of optical sensing is disclosed. The method comprises coupling an excitation optical signal into a first optical fiber to induce Rayleigh backscattering, thereby providing a backscattered signal; coupling the backscattered signal into a second optical fiber, spatially separated from the first optical fiber; and optically amplifying the backscattered signal in the second optical fiber, thereby generating a sensing signal.
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Citations
26 Claims
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1. A method of optical sensing, comprising:
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coupling an excitation optical signal into a first optical fiber to induce Rayleigh backscattering, thereby providing a backscattered signal; coupling said backscattered signal into a second optical fiber, spatially separated from said first optical fiber; and optically amplifying said backscattered signal in said second optical fiber, thereby generating a sensing signal; wherein said optically amplifying comprises introducing a pump light beam into said second fiber, wherein said pump light beam and said backscattered signal enter said second fiber from the same end thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of optical sensing, comprising:
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coupling an excitation optical signal into an optical fiber to induce Rayleigh backscattering, thereby providing a backscattered signal; optically amplifying said backscattered signal in said optical fiber, thereby generating a sensing signal; wherein said optically amplifying is by pump light beam at intensity I satisfying gI≥
K+2α
, said α
being a Rayleigh scattering coefficient characteristic to said fiber, said g being a gain coefficient characteristic to said fiber, and said K being a predetermined variation rate which larger than −
0.01 m−
1. - View Dependent Claims (12, 13)
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14. A system for optical sensing, comprising:
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a light source system configured for generating an excitation optical signal selected to induce Rayleigh backscattering, and a pump light beam selected to amplify said Rayleigh backscattering; an arrangement of optical couplers arranged for coupling said excitation optical signal into a first optical fiber thereby providing a backscattered signal, and for coupling said backscattered signal and said pump light beam into a second optical fiber, spatially separated from said first optical fiber, to thereby generate an optically amplified sensing signal, wherein said pump light beam and said backscattered signal enter said second fiber from the same end thereof; and a signal analyzer, for analyzing said sensing signal so as to identify a change in at least one property along said first fiber. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system of optical sensing, comprising:
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a light source system configured for generating an excitation optical signal selected to induce Rayleigh backscattering, and a pump light beam selected to amplify said Rayleigh backscattering; an optical coupler arranged for coupling said excitation optical signal and said pump light beam into an optical fiber to thereby generate an optically amplified sensing signal; and a signal analyzer, for analyzing said sensing signal so as to identify a change in at least one property along said fiber; wherein said pump light beam has intensity I satisfying gl≥
K+2α
, said α
being a Rayleigh scattering coefficient characteristic to said fiber, said g being a gain coefficient characteristic to said fiber, and said K being a predetermined variation rate which larger than −
0.01 m−
1. - View Dependent Claims (25, 26)
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Specification