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Functional refractive-index sensor by internal reflection of diffuse light

Functional refractive-index sensor by internal reflection of diffuse light This study aims to propose and study a refractive index sensor based on measuring variations of the internal diffuse reflectance from a glass interface in a functional design. The device is uncomplicated to assemble with simple optical elements and it can be built as a robust and stable sensor.Design/methodology/approachThis study presents a simplified theoretical model of the signal obtained with the proposed device and perform a detailed analysis of its potential resolution and merits.FindingsThe authors report proof-of-principle experiments with a home-made device to evaluate its performance as a refractometer and index of refraction sensor.Originality/valueThe main novelty of the device is the use of a diffusing surface to couple light into a glass plate with a wide range of angles of refraction, including angles larger than the critical angle with the external medium, and using the same diffusing surface to couple reflected light out of the glass plate, including light that suffered total internal reflection. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Sensor Review Emerald Publishing

Functional refractive-index sensor by internal reflection of diffuse light

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References (35)

Publisher
Emerald Publishing
Copyright
© Emerald Publishing Limited
ISSN
0260-2288
eISSN
0260-2288
DOI
10.1108/sr-08-2022-0301
Publisher site
See Article on Publisher Site

Abstract

This study aims to propose and study a refractive index sensor based on measuring variations of the internal diffuse reflectance from a glass interface in a functional design. The device is uncomplicated to assemble with simple optical elements and it can be built as a robust and stable sensor.Design/methodology/approachThis study presents a simplified theoretical model of the signal obtained with the proposed device and perform a detailed analysis of its potential resolution and merits.FindingsThe authors report proof-of-principle experiments with a home-made device to evaluate its performance as a refractometer and index of refraction sensor.Originality/valueThe main novelty of the device is the use of a diffusing surface to couple light into a glass plate with a wide range of angles of refraction, including angles larger than the critical angle with the external medium, and using the same diffusing surface to couple reflected light out of the glass plate, including light that suffered total internal reflection.

Journal

Sensor ReviewEmerald Publishing

Published: Jan 2, 2023

Keywords: Refractive index sensor; Internal reflectance; Diffuse light; Optical sensor

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