期刊
SENSORS
卷 19, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/s19102263
关键词
long-period fiber grating (LPFG); polymer coating; humidity sensor; PEG; PVA
资金
- National Natural Science Foundation of China [61875117]
- Natural Science Foundation of Hebei Province [F2018403050]
We demonstrate a simple and highly sensitive optical fiber relative humidity (RH) sensor based on a long-period fiber grating (LPFG) coated with polyethylene glycol (PEG)/polyvinyl alcohol (PVA) composite films. The resonance wavelength of the LPFG is sensitive to environmental humidity due to the change in effective refractive index caused by the strong surface absorption and desorption of the porous PEG/PVA coatings. The sensor is sensitive in a wide range from 50% to 95% RH, with a highest sensitivity of 2.485 nm/%RH in the range 50-75% RH. The proposed RH sensor has the advantages of compact size, good reversibility, and stability, which makes it attractive for high-humidity environments.
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