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Optical Engineering

Simple thin-film fiber optic temperature sensor based on Fabry-Perot interference
Author(s): Ji-Huan Chen; Xu Guang Huang; Zhen-Jian Huang
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Paper Abstract

A simple fiber optic temperature sensor with a micro Fabry-Perot cavity constructed with a thin film coated on a fiber end is presented. Its operation principle is based on the temperature-dependent wavelength shift of the interference fringes formed by Fresnel reflections from both interfaces of the thin film. An analytical formula is derived from the theory of two-beam interference. Experimental temperature data agree with the theoretical result. A temperature resolution of 0.1 K within the range from 20 to 100 °C with good stability can be achieved. The proposed temperature sensor has a simple, solid, and compact structure.

Paper Details

Date Published: 1 April 2010
PDF: 4 pages
Opt. Eng. 49(4) 044402 doi: 10.1117/1.3407460
Published in: Optical Engineering Volume 49, Issue 4
Show Author Affiliations
Ji-Huan Chen, South China Normal Univ. (China)
Xu Guang Huang, South China Normal Univ. (China)
Zhen-Jian Huang, South China Normal Univ. (China)

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