Optical fiber refractometry based on multimode interference

Orlando Frazão; Susana O. Silva; Jaime Viegas; Lús A. Ferreira; Francisco M. Araújo; José L. Santos

doi:10.1364/AO.50.00E184

Optical fiber refractometry based on multimode interference

Orlando Frazão, Susana O. Silva, Jaime Viegas, Lús A. Ferreira, Francisco M. Araújo, José L. Santos

Electrical Engineering

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

This paper presents an overview of optical fiber sensors based on multimode interference with a focus on refractometric applications. A specific configuration is presented to measure the refractive index of the surrounding liquid based on the Fresnel reflection in the fiber tip, combined with a simple interrogation technique that uses two fiber Bragg gratings as discrete optical sources, with the measurand information encoded in the relative intensity variation of the reflected signals. A resolution of 1:75 × 10-3 RIU is achieved.

Original language	British English
Pages (from-to)	E184-E188
Journal	Applied Optics
Volume	50
Issue number	25
DOIs	https://doi.org/10.1364/AO.50.00E184
State	Published - 1 Sep 2011

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abstract = "This paper presents an overview of optical fiber sensors based on multimode interference with a focus on refractometric applications. A specific configuration is presented to measure the refractive index of the surrounding liquid based on the Fresnel reflection in the fiber tip, combined with a simple interrogation technique that uses two fiber Bragg gratings as discrete optical sources, with the measurand information encoded in the relative intensity variation of the reflected signals. A resolution of 1:75 × 10-3 RIU is achieved.",

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AU - Araújo, Francisco M.

AU - Santos, José L.

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AB - This paper presents an overview of optical fiber sensors based on multimode interference with a focus on refractometric applications. A specific configuration is presented to measure the refractive index of the surrounding liquid based on the Fresnel reflection in the fiber tip, combined with a simple interrogation technique that uses two fiber Bragg gratings as discrete optical sources, with the measurand information encoded in the relative intensity variation of the reflected signals. A resolution of 1:75 × 10-3 RIU is achieved.

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Optical fiber refractometry based on multimode interference

Abstract

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