Fiber Optical Bragg Grating Refractometer |
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Authors: | A. Asseh S. Sandgren H. Ahlfeldt B. Sahlgren R. Stubbe G. Edwall |
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Abstract: | We have demonstrated an evanescent field refractive indexfiber sensor comprising a 42-mm Bragg grating in an etched fiber together with a tunable Distributed Bragg Reflector (DBR) laser. Characterization of different aqueous sucrose solutions resulted in a resolution of roughly 10 mM sucrose. The sensor in the presented form has a theoretical sensitivity of higher than 10 5 refractive index unit (riu) in a refractive index region close to the cladding index of the fiber. However, the technique allows for an even higher sensitivity than 10 6 riu with a proper signal processing scheme. |
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Keywords: | Bragg Gratings Evanescent Field Sensing Fiber Optical Sensors Refractive Index Tunable Lasers |
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