Title :
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
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;
Conference_Titel :
Communications and Photonics Conference and Exhibition, 2011. ACP. Asia
Conference_Location :
Shanghai
Print_ISBN :
978-0-8194-8961-6
