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    Polyvinyl alcohol coated photonic crystal optical fiber sensor for humidity measurement

    Year: 2012

    Journal: Sensors and Actuators B, 2012, 174, 563-569, 20131009

    Authors: Wei Chang Wong, Chi Chiu Chan, Li Han Chen, Tao Li, Kok Xian Lee, Kam Chew Leong

    Organizations: Division of Bioengineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457, Singapore; Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China; Globalfoundries Singapore Pte Ltd, 60 Woodlands Industrial Park D Street 2 Singapore 738406, Singapore

    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.