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5 October 2009Wide range refractive index sensor using a twin-grating interferometer for intensity reference
An optical fiber refractometer based on the Fresnel reflection in the fiber tip and twin FBG interferometer located near
the fiber tip for light intensity referencing is reported. A wavelength scanning DFB diode laser was used for RI sensor
interrogation. Signal processing in the Fourier domain allows intensity-independent accurate measurements for liquids
and gases with practically any RI. A resolution of 5 - 10 5-5 was demonstrated experimentally using different liquids
including an anti-reflection index-matching liquid. Simple construction and the use of low-cost components make it
interesting for many applications.
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M. G. Shlyagin, Rodolfo Martínez Manuel, O. Esteban, "Wide range refractive index sensor using a twin-grating interferometer for intensity reference," Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75031J (5 October 2009); https://doi.org/10.1117/12.835521