期刊
APPLIED OPTICS
卷 52, 期 1, 页码 90-95出版社
OPTICAL SOC AMER
DOI: 10.1364/AO.52.000090
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资金
- National Key Basic Research and Development Program of China [2010CB327801]
- National Natural Science Foundation of China [11204212, 61274113, 11004110]
- Program for New Century Excellent Talents in University [NCET-11-1064]
- Tianjin Natural Science Foundation [10SYSYJC27700, 10ZCKFGX01200, 20100703]
- China Postdoctoral Science Foundation Funded Project [2012M520024]
A relative humidity (RH) sensor based on long-period grating (LPG) with different responses is proposed by utilizing agarose gel as the sensitive cladding film. The spectral characteristic is discussed as the ambient humidity level ranges from 25% to 95% RH. Since increment of RH will result in volume expansion and refractive index increment of the agarose gel, the LPG is sensitive to applied strain and ambient refractive index; both the resonance wavelength and coupling intensity present particular responses to RH within two different RH ranges (25%-65% RH and 65%-96% RH). The coupling intensity decreases within a lower RH range while it increases throughout a higher RH range. The resonance wavelength is sensitive to the higher RH levels, and the highest sensitivity reaches 114.7 pm/% RH, and shares the same RH turning point with coupling intensity response. From a practical perspective, the proposed RH sensor would find its potential applications in high humidity level, temperature-independent RH sensing and multiparameter sensing based on wavelength/power hybrid demodulation and even static RH alarm for automatic monitoring of a particular RH value owing to the nonmonotonic RH dependence of the transmission power within the whole tested RH range. (c) 2012 Optical Society of America
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