Journal
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
Volume 55, Issue 10, Pages 2305-2307Publisher
WILEY
DOI: 10.1002/mop.27847
Keywords
optical fiber sensor; polyvinyl alcohol; relative humidity measurement; Sagnac interferometer
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Funding
- National Basic Research Program of China (973 Program) [2010CB327804, 2011baf06b02]
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A relative humidity sensor based on two polarization maintaining fibers (PMFs) Sagnac interferometer with temperature compensation is presented by utilizing polyvinyl alcohol (PVA) as the sensitive cladding film. The proposed sensor is created through coating a thin layer of PVA onto a PMF from which a portion of the cladding is etched. PVA-coated PMF is for air relative humidity measurement and the other section PMF is for temperature compensation. The results show that the dip wavelength of the transmission spectrum shifts with the relative humidity with a high sensitivity of 111.5 pm/%RH. Meanwhile the sensor is insensitive to environmental temperature change with thermal-dependent coefficient of 7.2 pm/degrees C. (C) 2013 Wiley Periodicals, Inc.
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