Polyvinyl alcohol-coated hybrid fiber grating for relative humidity sensing

被引：74

作者：

Dong, Xinyong ^{[1
]}

Li, Tao ^{[1
]}

Liu, Yang ^{[1
]}

Li, Yi ^{[1
]}

Zhao, Chun-Liu ^{[1
]}

Chan, Chi Chiu ^{[2
]}

机构：

[1] China Jiliang Univ, Inst Optoelect Technol, Hangzhou 310018, Zhejiang, Peoples R China

[2] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637457, Singapore

来源：

JOURNAL OF BIOMEDICAL OPTICS | 2011年 / 16卷 / 07期

基金：

中国国家自然科学基金;

关键词：

fiber Bragg grating; tilted-fiber Bragg grating; humidity sensing; polyvinyl alcohol; CLADDING-MODES; SENSOR;

D O I：

10.1117/1.3595845

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

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 similar to 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. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3595845]

引用

页数：4

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