Differential FBG sensor for temperature-compensated high-pressure (or displacement) measurement

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• 作者：Zhao ; Yong ; Yu ; Chengbo ; Liao ; Yanbiao
• 关键词：Fiber Bragg grating ; Temperature-compensated measurement ; Pressure measurement ; Isosceles triangle cantilever ; Differential measurement ; Displacement
• 刊名：Optics and Laser Technology
• 出版年：2004
• 出版时间：February, 2004
• 年：2004
• 卷：36
• 期：1
• 页码：39-42
• 全文大小：332 K

文摘

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 1.75pm/μm, and the estimated pressure measurement resolution can reach 0.27MPa in case the wavelength shift measurement resolution is 0.01nm.