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Regular | Open Access

Polyimide-Coated Fiber Bragg Grating for Relative Humidity Sensing

Yao LIN, Yuan GONG( ), Yu WU, Huijuan WU
Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education of China), University of Electronic Science and Technology of China, Chengdu, 611731, China
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Abstract

A fiber-optic humidity sensor has been fabricated by coating a moisture sensitive polymer film to the fiber Bragg grating (FBG). The Bragg wavelength of the polyimide-coated FBG changes while it is exposed to different humidity conditions due to the volume expansion of the polyimide coating. The characteristics of sensors, including sensitivity, temporal response, and hysteresis, were improved by controlling the coating thickness and the degree of imidization during the thermal curing process of the polyimide. In the relative humidity (RH) condition ranging from 11.3% RH to 97.3% RH, the sensitivity of the sensor was about 13.5 pm/% RH with measurement uncertainty of ±1.5% RH.

Keywords

Fiber Bragg gratinghumidity sensingmoisture sensitive

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Photonic Sensors
Volume 5 Issue 1,
March 2015
Pages 60-66
DOI: 10.1007/s13320-014-0218-8

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Cite this article:
LIN Y, GONG Y, WU Y, et al. Polyimide-Coated Fiber Bragg Grating for Relative Humidity Sensing. Photonic Sensors, 2015, 5(1): 60-66. https://doi.org/10.1007/s13320-014-0218-8

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Received: 05 August 2014
Revised: 09 September 2014
Published: 17 October 2014
© The Author(s) 2014.

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