Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 194, Issue -, Pages 180-184Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.12.081
Keywords
Fiber-optic sensors; Michelson interferometer; Fiber-optic humidity sensor; Waist-enlarged bitaper
Funding
- National Basic Research Program of China (973 Program) [2010CB327804]
- National Natural Science Foundation of China [61007050, 61007051]
- National Natural Science Foundation of Zhejiang Province, China [Z13F050003]
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A fiber-optic humidity sensor composed of a chitosan-coated, waist-enlarged bitaper-based Michelson interferometer (WEBMI) is proposed and experimentally demonstrated. Humidity changes interference pattern of the sensor head through refractive index of the chitosan coating thus relative humidity level can be determined from corresponding wavelength shift. The achieved sensitivity is further enhanced by more than 5 times, from 26 pm/%RH to 135 pm/%RH, by reducing the fiber cladding thickness and oxidizing the chitosan film. Experimentations show that the measurement is fully reversible and repeatable with fast response and recovery time of similar to 5 s and 3 s, respectively. (C) 2014 Elsevier B. V. All rights reserved.
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