Wide range refractive index sensor using a twin-grating interferometer for intensity reference

M. G. Shlyagin; Rodolfo Martínez Manuel; O. Esteban

doi:10.1117/12.835521

5 October 2009 Wide range refractive index sensor using a twin-grating interferometer for intensity reference

M. G. Shlyagin, Rodolfo Martínez Manuel, O. Esteban

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75031J (2009) https://doi.org/10.1117/12.835521
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

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.

Citation Download Citation

M. G. Shlyagin, Rodolfo Martínez Manuel, and 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

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