Differential FBG sensor for temperature-compensated high-pressure (or displacement) measurement
✍ Scribed by Yong Zhao; Chengbo Yu; Yanbiao Liao
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 332 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0030-3992
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✦ Synopsis
A di erential ÿber Bragg grating (FBG) sensor with a free active element bulk-modulus for high-pressure (or displacement) measurement is presented. Based on the di erential 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= m, and the estimated pressure measurement resolution can reach 0:27 MPa in case the wavelength shift measurement resolution is 0:01 nm.