Title :
Humidity Sensor With a PVA-Coated Photonic Crystal Fiber Interferometer
Author :
Tao Li ; Xinyong Dong ; Chi Chiu Chan ; Kai Ni ; Shuqin Zhang ; Shum, Perry Ping
Author_Institution :
Inst. of Optoelectron. Technol., China Jiliang Univ., Hangzhou, China
Abstract :
A photonic crystal fiber (PCF)-model interferometer (MI)-based relative humidity (RH) sensor is proposed and experimentally demonstrated. The PCF-MI is formed by fusion splicing a short length of PCF between two single-mode fibers with the air holes of the PCF in the splicing regions being fully collapsed. It was then coated with a layer of polyvinyl alcohol by using a dip-coating process. Experimental results show that a high humidity sensitivity of 40.9 pm/%RH is achieved within a measurement range of 20-95%RH. The sensor also shows good repeatability and low temperature independence.
Keywords :
chemical sensors; fibre optic sensors; humidity sensors; light interferometers; organic compounds; photonic crystals; PCF-MI-based RH sensor; PVA-coated photonic crystal fiber interferometer; dip-coating process; humidity sensitivity; humidity sensor; photonic crystal fiber-model interferometer-based relative humidity sensor; polyvinyl alcohol; single-mode fibers; Bragg gratings; Humidity; Optical fiber sensors; Optical fibers; Sensitivity; Temperature measurement; Wavelength measurement; Humidity sensors; interferometers; photonic crystal fibers; polyvinyl alcohol;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2012.2234100
