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

Ginu Rajan, Yusof Mohd Noor, Bing Liu, Eliathamby Ambikairaja, David J. Webb, Gang-Ding Peng

Research output: Contribution to journalArticle

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 μm. 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.
Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalSensors and Actuators A : physical
Volume203
Early online date3 Sep 2013
DOIs
Publication statusPublished - Dec 2013

Keywords

  • polymer FBG sensor
  • humidity sensors
  • etched gratings

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