期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 174, 期 -, 页码 563-569出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.07.032
关键词
Humidity; Optical fiber sensor; Interferometer; Photonic crystal fiber; Polyvinyl alcohol; Cladding mode excitation; Optical device; Polymer swelling
A polyvinyl alcohol (PVA) coated photonic crystal optical fiber (PCF) sensor has been proposed as a relative humidity (RH) sensor. It was fabricated by collapsing the holes of PCF at both ends to form a Michelson interferometer with cladding mode excitation. PVA was dip coated onto the sensor and the interference shift was measured when the sensor was exposed to varying RH. The sensor with 9% (w/w) coating showed a high sensitivity of 0.60 nm/%RH, displayed little hysteresis, high repeatability, low cross-sensitivity to temperature and ammonia gas and stability over 7 days of testing. A rise/fall time of 300/500 ms was achieved respectively. (c) 2012 Elsevier B.V. All rights reserved.
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