Sagnac optical-fiber deformation sensor of low-coherent twisted torqued

Abstract

A Sagnac-like optical fiber sending device of low coherent twisted type is prepared as connecting optical source and photoelectric detector at a side of a coupler and connecting another side of said coupler to a closed loop formed by series-connecting various single-mode optical sending arms with 2x2 couplers. The closed loop is featured as out-setting single-mode optical fiber of high reflection surface and single-mode out-set optical fiber, using self-focusing lens and scan-reflector to form demodulation end of optical fiber and returning partial light back to light detector through said single-mode optical fiber.

Description

(1) Technical field

[0001] The invention relates to an optical fiber deformation sensing device, which belongs to the technical field of optical fiber sensing, in particular to a sensing device for distributed measurement of deformation based on an optical low-coherence interference measurement technology. (2) Background technology

[0002] Compared with traditional sensors, optical fiber sensors have the advantages of strong anti-electromagnetic interference ability, high temperature resistance, high pressure resistance, strong chemical corrosion resistance, light weight, high sensitivity, low loss and easy realization of distributed sensing. Since the mid-1970s, Research has grown into an emerging industry with an annual turnover of more than US$1 billion and is expected to have a market of more than US$5 billion in 2010. According to the statistics of the 15th annual International Optical Fiber Sensing Conference (OFS) sponsored by the Society of Optical Engineers (OSA), ...

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