Novel fiber Bragg grating sensor for temperature-insensitive displacement measurement

Xinyong Dong; Ping Shum; Nam Quoc Ngo; Chi Chiu Chan; Khay Ming Tan

doi:10.1117/12.571176

8 December 2004 Novel fiber Bragg grating sensor for temperature-insensitive displacement measurement

Xinyong Dong, Ping Shum, Nam Quoc Ngo, Chi Chiu Chan, Khay Ming Tan

Proceedings Volume 5590, Sensors for Harsh Environments; (2004) https://doi.org/10.1117/12.571176
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

Abstract

We report the design and development of a novel optical fiber Bragg grating based displacement sensor. A fiber Bragg grating is glued at a slant orientation onto the lateral side of a specially designed cantilever beam. It is found that the bandwidth of the FBG-based sensor changes linearly with the variation of displacement at the free end of the beam due to the displacement-induced strain gradient. Displacement sensing is realized by measuring the reflected optical power of the signal from the grating with a photodetector. A linear response of 37.9 mV/mm was obtained within a displacement range of 9.0 mm. This sensor is also cost effective due to the use of a simple demodulation method and is inherently temperature-insensitive; eliminating the need for temperature compensation.

Citation Download Citation

Xinyong Dong, Ping Shum, Nam Quoc Ngo, Chi Chiu Chan, and Khay Ming Tan "Novel fiber Bragg grating sensor for temperature-insensitive displacement measurement", Proc. SPIE 5590, Sensors for Harsh Environments, (8 December 2004); https://doi.org/10.1117/12.571176

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