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Sensors 2013, 13(11), 15261-15273; doi:10.3390/s131115261

Monitoring the Evaporation of Fluids from Fiber-Optic Micro-Cell Cavities

1
Faculty of Engineering, Bar-Ilan University, Ramat-Gan 52900, Israel
2
Faculty of Electrical Engineering and Computer Science, University of Maribor, 2000 Maribor, Slovenia
3
Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
*
Author to whom correspondence should be addressed.
Received: 25 September 2013 / Revised: 25 October 2013 / Accepted: 1 November 2013 / Published: 7 November 2013
(This article belongs to the Special Issue Photonic Sensors for Industrial, Environmental and Health Monitoring)
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Abstract

Fiber-optic sensors provide remote access, are readily embedded within structures, and can operate in harsh environments. Nevertheless, fiber-optic sensing of liquids has been largely restricted to measurements of refractive index and absorption spectroscopy. The temporal dynamics of fluid evaporation have potential applications in monitoring the quality of water, identification of fuel dilutions, mobile point-of-care diagnostics, climatography and more. In this work, the fiber-optic monitoring of fluids evaporation is proposed and demonstrated. Sub-nano-liter volumes of a liquid are applied to inline fiber-optic micro-cavities. As the liquid evaporates, light is refracted out of the cavity at the receding index boundary between the fluid and the ambient surroundings. A sharp transient attenuation in the transmission of light through the cavity, by as much as 50 dB and on a sub-second time scale, is observed. Numerical models for the transmission dynamics in terms of ray-tracing and wavefront propagation are provided. Experiments show that the temporal transmission profile can distinguish between different liquids.
Keywords: fiber-optic sensors; opto-fluidics; evaporation monitoring; optical micro-cells; fiber cavities; droplet analysis fiber-optic sensors; opto-fluidics; evaporation monitoring; optical micro-cells; fiber cavities; droplet analysis
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Preter, E.; Preloznik, B.; Artel, V.; Sukenik, C.N.; Donlagic, D.; Zadok, A. Monitoring the Evaporation of Fluids from Fiber-Optic Micro-Cell Cavities. Sensors 2013, 13, 15261-15273.

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