Response of hydrogel coated cascaded long period gratings to relative humidity

Xiujuan Yu; Min Zhang; Shengchun Liu; Yanbiao Liao; Wei Jin

doi:10.1117/12.883614

18 May 2011 Response of hydrogel coated cascaded long period gratings to relative humidity

Xiujuan Yu, Min Zhang, Shengchun Liu, Yanbiao Liao, Wei Jin

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 775390 (2011) https://doi.org/10.1117/12.883614
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

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.

Citation Download Citation

Xiujuan Yu, Min Zhang, Shengchun Liu, Yanbiao Liao, and Wei Jin "Response of hydrogel coated cascaded long period gratings to relative humidity", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775390 (18 May 2011); https://doi.org/10.1117/12.883614

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