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

57 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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10.1364/AO.50.00E184

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title = "Optical fiber refractometry based on multimode interference",

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 - Frazão, Orlando

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AU - Viegas, Jaime

AU - Ferreira, Lús A.

AU - Araújo, Francisco M.

AU - Santos, José L.

PY - 2011/9/1

Y1 - 2011/9/1

N2 - 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.

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.

UR - https://www.scopus.com/pages/publications/80052372576

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DO - 10.1364/AO.50.00E184

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JO - Applied Optics

JF - Applied Optics

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Optical fiber refractometry based on multimode interference

Abstract

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