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	A relative humidity sensor using a hydrogel-coated long period grating
	Liwei Wang ; Yang Liu ; Min Zhang ; Dongsheng Tu ; Xianhui Mao ; Yanbiao Liao
	2010-05-06 ; 2010-05-06
关键词	Practical Experimental/ diffraction gratings fibre optic sensors humidity sensors/ relative humidity sensor long period grating step index waveguide model hydrogel thin-film fiber sensor/ A4281P Fibre optic sensors fibre gyros A0670D Sensing and detecting devices A0725 Hygrometry A4280F Gratings, echelles B7230E Fibre optic sensors B7320X Humidity measurement
中文摘要	A long period grating (LPG) coated with hydrogel has been developed for monitoring the relative humidity (RH) levels. The response wavelength of the LPG varies with the changes of the relative humidity. The four-layered step index waveguide model is presented to explain this observation, which is based on the effect of the hydrogel thin film, the index of which increases with the increasing RH. Experiment shows that the hydrogel-coated LPG sensor is highly sensitive between 38.9% and 100% RH, and behaves linearly with humidity with an accuracy of +/-2.3% RH. The small-size and low-cost LPG fibre sensor will have extensive applications in various areas, such as remotely measuring RH, building health monitoring, medical facilities and goods' preservation.
语种	英语 ; 英语
出版者	IOP Publishing ; UK
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/10977]
专题	清华大学
推荐引用方式 GB/T 7714	Liwei Wang,Yang Liu,Min Zhang,et al. A relative humidity sensor using a hydrogel-coated long period grating[J],2010, 2010.
APA	Liwei Wang,Yang Liu,Min Zhang,Dongsheng Tu,Xianhui Mao,&Yanbiao Liao.(2010).A relative humidity sensor using a hydrogel-coated long period grating..
MLA	Liwei Wang,et al."A relative humidity sensor using a hydrogel-coated long period grating".(2010).

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