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Open AccessArticle

Demonstration of a Low-Cost and Portable Optical Cavity-Based Sensor through Refractive Index Measurements

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Electrical Engineering Department, Baylor University, One Bear Place #97356, Waco, TX 76798, USA
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Biomedical Engineering Program, Baylor University, One Bear Place #97356, Waco, TX 76798, USA
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Author to whom correspondence should be addressed.
Sensors 2019, 19(9), 2193; https://doi.org/10.3390/s19092193
Received: 25 April 2019 / Revised: 9 May 2019 / Accepted: 10 May 2019 / Published: 12 May 2019
(This article belongs to the Section Optical Sensors)
An optical cavity-based sensor using a differential detection method has been proposed for point-of-care diagnostics. We developed a low-cost and portable optical cavity-based sensor system using a 3D printer and off-the-shelf optical components. In this paper, we demonstrate the sensing capability of the portable system through refractive index measurements. Fabricated optical cavity samples were tested using the portable system and compared to simulation results. A referencing technique and digital low pass filtering were applied to reduce the noise of the portable system. The measurement results match the simulation results well and show the improved linearity and sensitivity by employing the differential detection method. The limit of detection achieved was 1.73 × 10−5 Refractive Index Unit (RIU), which is comparable to other methods for refractive index sensing. View Full-Text
Keywords: optical cavity sensor; refractive index measurements; biosensors; portable system optical cavity sensor; refractive index measurements; biosensors; portable system
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MDPI and ACS Style

Rho, D.; Breaux, C.; Kim, S. Demonstration of a Low-Cost and Portable Optical Cavity-Based Sensor through Refractive Index Measurements. Sensors 2019, 19, 2193.

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