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Proceedings Paper

Novel fiber Bragg grating sensor for temperature-insensitive displacement measurement
Author(s): Xinyong Dong; Ping Shum; Nam Quoc Ngo; Chi Chiu Chan; Khay Ming Tan
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Paper 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.

Paper Details

Date Published: 8 December 2004
PDF: 5 pages
Proc. SPIE 5590, Sensors for Harsh Environments, (8 December 2004); doi: 10.1117/12.571176
Show Author Affiliations
Xinyong Dong, Nanyang Technological Univ. (Singapore)
Ping Shum, Nanyang Technological Univ. (Singapore)
Nam Quoc Ngo, Nanyang Technological Univ. (Singapore)
Chi Chiu Chan, Nanyang Technological Univ. (Singapore)
Khay Ming Tan, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 5590:
Sensors for Harsh Environments
Anbo Wang, Editor(s)

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