We have demonstrated an evanescent field refractive index fiber sensor comprising a 42 mm Bragg grating in an etched fiber together with a tunable 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 units (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.
Evanescent field refractive index sensor utilizing a narrow fiber Bragg grating and a tunable DBR laser
Chemical, Biochemical, and Environmental Fiber Sensors VIII ; 1996 ; Denver,CO,United States
Proc. SPIE ; 2836
1996-12-10
Conference paper
Electronic Resource
English
High Sensitivity Evanescent Field Fiber Bragg Grating Sensor
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