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Journal of Biomedical Optics

Polyvinyl alcohol-coated hybrid fiber grating for relative humidity sensing
Author(s): Xinyong Dong; Tao Li; Yang Liu; Yi Li; Chun-Liu Zhao; Chi Chiu Chan
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Paper Abstract

A relative humidity (RH) sensor based on a hybrid fiber grating coated with polyvinyl alcohol is proposed and demonstrated experimentally. The hybrid fiber grating is formed by superimposing a normal fiber Bragg grating (FBG) and a tilted-FBG around the same position of a single-mode fiber so that it can work in the reflection mode. Optical power of the reflected signal changes with the refractive index of the moisture sensitive polyvinyl alcohol, and humidity measurement can be realized. Experimental results show that the measurement range is 30 to 95% with the maximum sensitivity of 0.737 nW/% RH. The average response time is ∼2 s and the measurement is nearly insensitive to temperature. Compared with the wavelength detection method used in normal FBG-based relative humidity sensors, the intensity demodulation method in this report is simpler and more cost-efficient.

Paper Details

Date Published: 1 July 2011
PDF: 5 pages
J. Biomed. Opt. 16(7) 077001 doi: 10.1117/1.3595845
Published in: Journal of Biomedical Optics Volume 16, Issue 7
Show Author Affiliations
Xinyong Dong, China Jiliang Univ. (China)
Tao Li, China Jiliang Univ. (China)
Yang Liu, China Jiliang Univ. (China)
Yi Li, China Jiliang Univ. (China)
Chun-Liu Zhao, China Jiliang Univ. (China)
Chi Chiu Chan, Nanyang Technological Univ. (Singapore)

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