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2. ENGINEERING AND TECHNOLOGY
An all-fiber displacement sensor with a simple configuration is proposed and investigated theoretically and experimentally. The proposed fiber displacement sensor consists of a half-loop structure of high-bend loss singlemode fiber-1060XP. A ratiometric power measurement system for interrogating the proposed sensor is also presented. By measuring the change in ratio of bend loss in the ratiometric measurement system, a change in displacement can be measured assuming the ratiometric system is calibrated. The proposed macrobending fiber based displacement sensor achieves a competitive resolution of circa 0.33 μm and also benefits from simplicity compared with the conventional fiber Bragg grating based displacement sensor. The bend loss fiber based displacement sensing system is sensitive to temperature, but the ratio response has a linear variation with temperature, which can be corrected by a suitable displacement correction process. Corresponding investigation on the temperature dependence of the macrobending fiber based displacement sensing system is presented in this paper.
Wang, P., Semenova, Y., Wu, Q. and Farrell, G.: “A bend loss based singlemode fiber micro-displacement sensor”, Microwave and Optical Technology Letters, Vol. 52, No. 10, pp. 2231-2235. October 2010.