A fast response intrinsic humidity sensor based on an etched singlemode polymer fiber Bragg grating

Authors

Ginu Rajan, University of New South WalesFollow
Yusof Mohd Noor, University of New South WalesFollow
Bing Liu, Qingdao University
Eliathamby Ambikairajah, University of New South Wales
David J. Webb, Aston University
Gang-Ding Peng, University of New South Wales

RIS ID

102615

Publication Details

G. Rajan, M. Yusof Mohd. Noor, B. Liu, E. Ambikairajah, D. J. Webb & G. Peng, "A fast response intrinsic humidity sensor based on an etched singlemode polymer fiber Bragg grating," Sensors and Actuators A: Physical, vol. 203, pp. 107-111, 2013.

Abstract

A simple, low cost and fast response time intrinsic relative humidity sensor system based on an etched singlemode polymer fiber Bragg (POFBG)is presented in this paper. A macro-bend linear edge filter which converts the humidity induced wavelength shift into an intensity change is used as the interrogation technique. The singlemode POFBG is etched to micro-meters in diameter to improve the response time of the humidity sensor. A response time of 4.5 s is observed for a polymer FBG with a cladding diameter of 25 m. The overall sensor system sensitivity was 0.23 mV/%RH. The etched POFBG humidity sensor shows anexponential decrease in response time with a decrease in fiber diameter. The developed sensor might have potential applications in a wide range of applications where fast and accurate real time humidity control is required.