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Proceedings Paper

Response of hydrogel coated cascaded long period gratings to relative humidity
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Paper Abstract

The response of transmission spectrum of cascaded long period gratings with hydrogel coating to relative humidity is investigated experimentally. Two configurations in terms of coated/not coated areas of the cascaded LPGs are explored to gain a significant enhancement of RH sensitivity. For humidity level greater than 50%RH, the visibility of the interference fringes is highly sensitive to relative humidity, showing a good linearity. The sensitivities of the two proposed hydrogel coated cascaded LPGs devices are 7.71 × 10-3/%RH and 7.08 × 10-3/%RH, respectively. RH accuracies of ± 0.45% and ± 0.32% are achieved, respectively.

Paper Details

Date Published: 18 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775390 (18 May 2011); doi: 10.1117/12.883614
Show Author Affiliations
Xiujuan Yu, Heilongjiang Univ. (China)
The Hong Kong Polytechnic Univ. (China)
Min Zhang, Tsinghua Univ. (China)
Shengchun Liu, Heilongjiang Univ. (China)
Yanbiao Liao, Tsinghua Univ. (China)
Wei Jin, The Hong Kong Polytechnic Univ. (China)


Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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