Differential FBG sensor for temperature-compensated high-pressure (or displacement) measurement |
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| Authors: | Yong Zhao Chengbo Yu Yanbiao Liao |
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| Affiliation: | a Department of Automation, Tsinghua University, Beijing 100084, China;b ChongQing Institute of Technology, Chongqing 400050, China;c Department of Electronic Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | A differential fiber Bragg grating (FBG) sensor with a free active element bulk-modulus for high-pressure (or displacement) measurement is presented. Based on the differential measurement method and an isosceles triangle cantilever structure, problems of cross-sensitivity and chirped signal in FBG sensor are improved both theoretically and experimentally. Preliminary experiments indicate that temperature-compensated measurement results agree well with the theoretical analysis. Displacement measurement sensitivity is 1.75 pm/μm, and the estimated pressure measurement resolution can reach 0.27 MPa in case the wavelength shift measurement resolution is 0.01 nm. |
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| Keywords: | Fiber Bragg grating Temperature-compensated measurement Pressure measurement Isosceles triangle cantilever Differential measurement Displacement |
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