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A multiplexed fiber Bragg grating sensor for simultaneous salinity and temperature measurement

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3 Author(s)
Men, Liqiu ; Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John’s, Newfoundland A1B 3X7, Canada ; Lu, Ping ; Chen, Qiying

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An in-line one-fiber approach to realize simultaneous measurement of salinity and temperature is proposed. The sensor system, which consists of multiplexed polymer-coated fiber Bragg gratings, showed that the polyimide-coated grating responds to variations of both temperature and salinity, while the acrylate-coated grating is only sensitive to the environmental temperature. The experimental results indicated that the temperature sensitivity of the acrylate-coated grating in water was 0.0102 nmC for redshifted Bragg wavelength with increasing temperature, and the temperature and the salinity sensitivities of the polyimide-coated grating were 0.0094 nmC (redshifted) and 0.0165 nm/M (blueshifted), respectively, which are in excellent agreement with the theoretical analysis.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 5 )