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Fabry–Pérot Cavity Based on a High-Birefringent Fiber Bragg Grating for Refractive Index and Temperature Measurement

Fabry–Pérot Cavity Based on a High-Birefringent Fiber Bragg Grating for Refractive Index and Temperature Measurement,10.1109/JSEN.2011.2107898,IEEE Se

Fabry–Pérot Cavity Based on a High-Birefringent Fiber Bragg Grating for Refractive Index and Temperature Measurement  
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A fiber-optic sensor for simultaneous measurement of refractiveindexandtemperatureisdescribed.Therefractiveindex measurement is based on the visibility variations of a Fabry-Pérot interferometer. It is formed with the interfering waves generated from a low reflectivity Bragg grating inscribed on a Panda fiber and from the fiber end tip (Fresnel reflection) in contact with the liquid. The sensor is characterized by immersing the fiber tip in distilled water with different concentrations of ethylene glycol. A linear relation of the interferometer fringe visibility with refrac- tive index variation is observed. The temperature is determined by the wavelength shift of the FBG peaks. Results show the feasibility of simultaneous measurement of refractive index and temperature and also the possibility of adjusting fringe visibility via polariza- tion control.
Journal: IEEE Sensors Journal - IEEE SENS J , vol. 12, no. 1, pp. 17-21, 2012
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