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8 September 2010Optical refractometer based on high birefringence Bragg grating Fabry-Perot cavity
An optical fibre sensor for simultaneous measurement of refractive index and temperature is presented. The refractive
index measurement is based on the visibility variations of a Fabry- Perot interferometer with interfering waves generated
in a low reflectivity Bragg grating inscribed on a Panda fibre and in the fibre tip (Fresnel reflection) in contact with the
liquid. The temperature measurement is based on the wavelength shift of the FBG peaks. Results obtained show the
feasibility of simultaneous measurement of refractive index and temperature and also the possibility of adjusting fringe
visibility via polarization control.
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C. Jesus, O. Frazão, P. A. S. Jorge, J. M. Baptista, "Optical refractometer based on high birefringence Bragg grating Fabry-Perot cavity," Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76530O (8 September 2010); https://doi.org/10.1117/12.866613