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A high sensitivity humidity sensor based on an Agarose coated photonic crystal fiber interferometer

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Abstract

We report a novel high sensitivity relative humidity (RH) sensor based on Agarose coated photonic crystal fiber interferometer. We also demonstrate the experimental method to precisely apply a suitable coating thickness to achieve high RH sensitivity. The sensor shows a linear response for an RH change in the range of 40-70 %RH with a humidity resolution of 0.03 %RH and a higher humidity resolution of 0.01 %RH in the range 70-95 %RH. The sensor response is found to be reversible and repeatable with good long term stability.

Original languageEnglish
Title of host publication22nd International Conference on Optical Fiber Sensors
DOIs
Publication statusPublished - 2012
Event22nd International Conference on Optical Fiber Sensors - Beijing, China
Duration: 15 Oct 201219 Oct 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8421
ISSN (Print)0277-786X

Conference

Conference22nd International Conference on Optical Fiber Sensors
Country/TerritoryChina
CityBeijing
Period15/10/1219/10/12

Keywords

  • Agarose
  • Humidity sensor
  • Photonic crystal fiber interferometer
  • Refractive index
  • Thin-film coating

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