Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 87, Issue 3, Pages 487-490Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-4005(02)00289-7
Keywords
optical sensor; fiber Bragg grating; hydrogel; sanility
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We report a new type of optical salinity sensor with a fiber Bragg grating (FBG) coated with hydrogels. The sensing mechanism in this device is based on mechanical stress that is induced in the chemically sensitive water swellable polymers (hydrogels) coating when the water escapes from it. The stress in the hydrogels coating stretches and shifts the Bragg wavelength of the FBG. Varying the composition of the gel, the sensor can be used to response to different trigger stimulus. Here the sensors for measuring salinity are demonstrated. (C) 2002 Elsevier Science B.V. All rights reserved.
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