Hydrogel Coated Long Period Grating Sensor for High Relative Humidity Measurement

Xiu Juan Yu; Jin Tao Zhang; Xue Feng Chen; Sheng Chun Liu

doi:10.4028/www.scientific.net/AMR.981.616

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 981Hydrogel Coated Long Period Grating Sensor for...

Hydrogel Coated Long Period Grating Sensor for High Relative Humidity Measurement

Abstract:

A very sensitive hydrogel coated long period grating (LPG) humidity sensor is developed and experimentally investigated for high relative humidity monitoring. A thin-film of PINPAM hydrogel is deposited onto the cladding of LPG by using dip-coating technique. The transmission spectrum of the coated LPG is studied at different humidity levels. For humidity levels greater than 95%, the resonant dip depth suffers a sharp linear increase with a span of 10.26 dB and the resonant wavelength suffers a redshift of 8.6nm.The proposed hydrogel coated LPG humidity sensor shows a high sensitivity of 2.86dB/%RH at high relative humidity region.

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Periodical:

Advanced Materials Research (Volume 981)

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616-619

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.981.616

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Online since:

July 2014

Authors:

Xiu Juan Yu*, Jin Tao Zhang, Xue Feng Chen, Sheng Chun Liu

Keywords:

High Relative Humidity, Humidity Sensor, Hydrogel, Long Period Grating

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