Optical fiber refractometer based on a Fabry-Perot interferometer

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Susana F O Silva (Author) Other; Frazao, O (Author) Other; Paul Caldas (Author) Other; Jose L Santos (Author) FCUP; Araujo, FM (Author) Other; Luis A Ferreira (Author) Other

Journal

Title: Optical Engineering

Vol. 47

Final page: 054403

ISSN: 0091-3286

Publisher: SPIE

Indexing

ISI Web of Knowledge - 38 Citations

Scopus - 42 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-003-ZWM

DOI: 10.1117/1.2931527

Abstract (EN): A fiber optic sensor for liquid refractive index measurement based on a Fabry-Perot interferometer is described. The interferometer is achieved between the reflection of a short fiber Bragg grating and the Fresnel reflection from the cleaved fiber end. This fiber end is then in contact with the liquid sample to provide refractive index measurements. The sensor is characterized by immersing the fiber tip in distilled water with different concentrations of ethylene glycol. A linear relation of the interferometer fringe visibility with refractive index variation is observed, and a resolution of similar to 10(-3) is obtained. It is also shown that the sensor operation is independent of temperature effects, other than the one related to temperature-induced change of the liquid refractive index. (c) 2008 Society of Photo-Optical Instrumentation Engineers.

Language: English

Type (Professor's evaluation): Scientific