Title :
Fiber Optic Hydrogen Sensor Based on Fabry–Perot Interferometer Coated With Sol-Gel Pt/WO 3 Coating
Author :
Yao Wang ; Minghong Yang ; Guilin Zhang ; Jixiang Dai ; Yi Zhang ; Zhi Zhuang ; Wenbin Hu
Author_Institution :
Nat. Eng. Lab. for Fiber Opt. Sensing Technol., Wuhan Univ. of Technol., Wuhan, China
Abstract :
A miniaturized fiber tip Fabry-Perot interferometer (FPI) with Pt/WO3 coating was demonstrated as a hydrogen sensor. The air-cavity of FPI was formed by inserting a single mode fiber into a partially polymer-filled glass capillary, which was highly sensitive to temperature. A layer of Pt/WO3 was coated on the glass capillary of the FPI serving as a reaction heater upon hydrogen exposure. The heat locally raised the FPI temperature, which led to the wavelength shift of interference spectrum. The average wavelength shift of sensor´s two interference dips was -20.3 nm upon exposure to ~20000-ppm hydrogen concentration. The hydrogen sensitivity of the sensor was estimated to be better than 1 pm/ppm.
Keywords :
Fabry-Perot interferometers; antireflection coatings; chemical sensors; fibre optic sensors; heating; hydrogen; light interference; optical fibre fabrication; optical fibre testing; optical glass; optical polymers; platinum; sol-gel processing; tungsten compounds; H2; Pt-WO3; air-cavity formation; fiber optic hydrogen sensor; interference spectrum; miniaturized fiber tip Fabry-Perot interferometer; partially polymer-filled glass capillary; reaction heater; single mode fiber; sol-gel platinum-tungsten trioxide coating; wavelength shift; Coatings; Hydrogen; Optical fiber sensors; Optical fibers; Polymers; Temperature measurement; Temperature sensors; Fabry-Perot interferometer; Fabry???Perot interferometer; Polymer; Pt/WO3 coating; hydrogen; optical fiber sensor; polymer;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2365183
