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

Authors
Journal
Sensors and Actuators A Physical
0924-4247
Publisher
Elsevier
Publication Date
Volume
203
Identifiers
DOI: 10.1016/j.sna.2013.08.036
Keywords
  • Polymer Fbg Sensor
  • Humidity Sensor
  • Etched Gratings

Abstract

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 4.5s is observed for a polymer FBG with a cladding diameter of 25μm. The overall sensor system sensitivity was 0.23mV/%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.

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