An optical fiber humidity sensor based on optical absorption

Author

Wang, Biao ; Zhang, Fujun ; Pang, Fufei ; Wang, Tingyun

Author_Institution

Key Lab. of Specialty Fiber Opt. & Opt. Access Networks, Shanghai Univ., Shanghai, China

fYear

2011

fDate

13-16 Nov. 2011

Firstpage

1

Lastpage

6

Abstract

A simple optical fiber relative humidity (RH) sensor was proposed and demonstrated. The humidity sensor was fabricated by coating moisture-sensitive film on the end face of a multi-mode optical fiber. The film was synthesized by doping CoCl₂ into a PVA/SiO₂ composite solution. Based on an optical absorption technique, the sensor head was characterized. From the optical absorption, a relative humidity range of 25%~65% was detected. Furthermore, the sensor has good repetitive response, and the response time was less than 2 min.

Keywords

antireflection coatings; cobalt compounds; doping; fibre optic sensors; humidity sensors; light absorption; optical films; silicon compounds; PVA; SiO₂:CoCl₂; coating moisture-sensitive film; composite solution; doping; multimode optical fiber; optical absorption; optical fiber humidity sensor; relative humidity sensor; Abstracts; Integrated optics; Optical sensors; cobalt chloride; humidity sensor; sol-gel; spin coating;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Photonics Conference and Exhibition, 2011. ACP. Asia

Conference_Location

Shanghai

ISSN

2162-108X

Print_ISBN

978-0-8194-8961-6

Type

conf

DOI

10.1117/12.904443

Filename

6210909