Polyvinyl alcohol-coated hybrid fiber grating for relative humidity sensing

Xinyong Dong; Tao Li; Yang Liu; Yi Li; Chun-Liu Zhao; Chi Chiu Chan

doi:10.1117/1.3595845

1 July 2011 Polyvinyl alcohol-coated hybrid fiber grating for relative humidity sensing

Xinyong Dong, Tao Li, Yang Liu, Yi Li, Chun-Liu Zhao, Chi Chiu Chan

Author Affiliations +

Journal of Biomedical Optics, Vol. 16, Issue 7, 077001 (July 2011). https://doi.org/10.1117/1.3595845

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.

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

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Xinyong Dong, Tao Li, Yang Liu, Yi Li, Chun-Liu Zhao, and Chi Chiu Chan "Polyvinyl alcohol-coated hybrid fiber grating for relative humidity sensing," Journal of Biomedical Optics 16(7), 077001 (1 July 2011). https://doi.org/10.1117/1.3595845

Published: 1 July 2011

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KEYWORDS

Humidity

Sensors

Fiber Bragg gratings

Temperature metrology

Cladding

Fiber coatings

Reflection

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