Abstract
We demonstrate the application of polymer-coated fiber Bragg gratings (FBGs) as a substance sensor, in which different polymers are used to achieve simultaneous measurement of the substance and temperature. As an example of polyimide-coated grating for detecting soluble substances, the sensitivities of the grating on the sugar and potassium chloride concentrations are 0.0012 nm/oBx and 0.0126 nm/M, respectively. The temperature sensitivities of the acrylate and polyimide-coated FBGs are 0.0102 and 0.0094 nm/oC, respectively. The technique provides an approach to detect different water-soluble substances without prior knowledge once a calibration curve is developed.
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