Polyimide-coated fiber Bragg grating for relative humidity sensing

被引：0
|
作者：
Yao Lin
Yuan Gong
Yu Wu
Huijuan Wu
机构：
[1] University of Electronic Science and Technology of China,Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education of China)
来源：
Photonic Sensors | 2015年 / 5卷
关键词：
Fiber Bragg grating; humidity sensing; moisture sensitive;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
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页码：60 / 66
页数：6
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