METHOD AND SYSTEM FOR OPTICAL FIBER SENSING
First Claim
Patent Images
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.
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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.
10 Citations
67 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. - View Dependent Claims (2, 3, 9, 10, 11, 21, 25, 27, 29, 31, 33)
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4. 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 (5, 7)
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35. 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; 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 (36, 37, 43, 44, 54, 56, 58, 60, 62, 64, 66)
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38. 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 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 (39, 41)
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Specification