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Proceedings Paper

Wide range refractive index sensor using a twin-grating interferometer for intensity reference
Author(s): M. G. Shlyagin; Rodolfo Martínez Manuel; O. Esteban
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Paper 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.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75031J (5 October 2009); doi: 10.1117/12.835521
Show Author Affiliations
M. G. Shlyagin, Ctr. de Investigación Científica y de Educación Superior de Ensenada (Mexico)
Rodolfo Martínez Manuel, Ctr. de Investigación Científica y de Educación Superior de Ensenada (Mexico)
O. Esteban, Univ. de Alcalá de Henares (Spain)


Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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