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Article

Optical Fiber Sensor for Monitoring the Evaporation of Ethanol–Water Mixtures

1
i3N & Department of Physics, University of Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal
2
Leibniz Institute of Photonic Technology IPHT, Albert-Einstein-Str. 9, 07745 Jena, Germany
3
ISOPlexis—Sustainable Agriculture and Food Technology Center, University of Madeira, Campus da Penteada, 9020-105 Funchal, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Ping Lu
Sensors 2022, 22(15), 5498; https://doi.org/10.3390/s22155498
Received: 30 June 2022 / Revised: 16 July 2022 / Accepted: 21 July 2022 / Published: 23 July 2022
(This article belongs to the Special Issue Volatile Organic Compounds Detection with Optical Fiber Sensors)
An inline optical fiber sensor is proposed to monitor in real time the evaporation process of ethanol–water binary mixtures. The sensor presents two interferometers, a cladding modal interferometer (CMI) and a Mach–Zehnder interferometer (MZI). The CMI is used to acquire the variations in the external medium refractive index, presenting a maximum sensitivity of 387 nm/RIU, and to attain the variation in the sample concentration profile, while the MZI monitors temperature fluctuations. For comparison purposes, an image analysis is also conducted to obtain the droplet profile. The sensor proposed in this work is a promising alternative in applications where a rigorous measurement of volatile organic compound concentrations is required, and in the study of chemical and physical properties related to the evaporation process. View Full-Text
Keywords: hollow square-core fiber; cladding modal interference; Mach–Zehnder interference; binary mixture; ethanol concentration; evaporation hollow square-core fiber; cladding modal interference; Mach–Zehnder interference; binary mixture; ethanol concentration; evaporation
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MDPI and ACS Style

Pereira, D.; Bierlich, J.; Kobelke, J.; Pereira, V.; Ferreira, M.S. Optical Fiber Sensor for Monitoring the Evaporation of Ethanol–Water Mixtures. Sensors 2022, 22, 5498. https://doi.org/10.3390/s22155498

AMA Style

Pereira D, Bierlich J, Kobelke J, Pereira V, Ferreira MS. Optical Fiber Sensor for Monitoring the Evaporation of Ethanol–Water Mixtures. Sensors. 2022; 22(15):5498. https://doi.org/10.3390/s22155498

Chicago/Turabian Style

Pereira, Diana, Jörg Bierlich, Jens Kobelke, Vanda Pereira, and Marta S. Ferreira. 2022. "Optical Fiber Sensor for Monitoring the Evaporation of Ethanol–Water Mixtures" Sensors 22, no. 15: 5498. https://doi.org/10.3390/s22155498

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