Research Papers: Sensing

Polyvinyl alcohol–coated hybrid fiber grating for relative humidity sensing

[+] Author Affiliations
Xinyong Dong

China Jiliang University, Institute of Optoelectronic Technology, Hangzhou, China, 310018

Nanyang Technological University, School of Chemical and Biomedical Engineering, Singapore, 637457, Singapore

Tao Li, Yang Liu, Yi Li, Chun-Liu Zhao

China Jiliang University, Institute of Optoelectronic Technology, Hangzhou, China, 310018

Chi Chiu Chan

Nanyang Technological University, School of Chemical and Biomedical Engineering, Singapore, 637457, Singapore

J. Biomed. Opt. 16(7), 077001 (July 01, 2011). doi:10.1117/1.3595845
History: Received March 07, 2011; Revised April 23, 2011; Accepted May 10, 2011; Published July 01, 2011; Online July 01, 2011
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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.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Xinyong Dong ; Tao Li ; Yang Liu ; Yi Li ; Chun-Liu Zhao, et al.
"Polyvinyl alcohol–coated hybrid fiber grating for relative humidity sensing", J. Biomed. Opt. 16(7), 077001 (July 01, 2011). ; http://dx.doi.org/10.1117/1.3595845


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