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Proceedings Paper

Evanescent field refractive index sensor utilizing a narrow fiber Bragg grating and a tunable DBR laser
Author(s): Adel Asseh; Simon Sandgren; Henrik Ahlfeldt; Bengt Sahlgren; Raoul Stubbe; Gunnar N.E. Edwall
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Paper Abstract

We have demonstrated an evanescent field refractive index fiber sensor comprising a 42 mm Bragg grating in an etched fiber together with a tunable DBR laser. Characterization of different aqueous sucrose solutions resulted in a resolution of roughly 10 mM sucrose. The sensor in the presented form has a theoretical sensitivity of higher than 10-5 refractive index units (riu) in a refractive index region close to the cladding index of the fiber. However, the technique allows for an even higher sensitivity than 10-6 riu with a proper signal processing scheme.

Paper Details

Date Published: 10 December 1996
PDF: 12 pages
Proc. SPIE 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII, (10 December 1996); doi: 10.1117/12.260578
Show Author Affiliations
Adel Asseh, Royal Institute of Technology (Sweden)
Simon Sandgren, Institute of Optical Research (Sweden)
Henrik Ahlfeldt, Industrial Microelectronics Ctr. (Sweden)
Bengt Sahlgren, Institute of Optical Research (Sweden)
Raoul Stubbe, Institute of Optical Research (Sweden)
Gunnar N.E. Edwall, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 2836:
Chemical, Biochemical, and Environmental Fiber Sensors VIII
Robert A. Lieberman, Editor(s)

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