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Open AccessArticle

All-Fiber Measurement of Surface Tension Using a Two-Hole Fiber

1
Center for Research and Advanced Studies of the National Polytechnic Institute (CINVESTAV Unidad Monterrey), Apodaca, Nuevo Leon 66600, Mexico
2
Fiber and Integrated Optics Laboratory, Centro de Investigaciones en Óptica A.C., Aguascalientes, AGS 20200, Mexico
3
CONACyT, Applied Physics Group, DICIS, University of Guanajuato, Salamanca, GTO 368850, Mexico
4
Applied Physics Group, DICIS, University of Guanajuato, Salamanca, GTO 368850, Mexico
5
Motorola Solutions de México, Cuajimalpa, CDMX 05120, Mexico
6
CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, FL 32816, USA
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(15), 4219; https://doi.org/10.3390/s20154219
Received: 26 June 2020 / Revised: 19 July 2020 / Accepted: 22 July 2020 / Published: 29 July 2020
(This article belongs to the Special Issue Specialty Optical Fiber Sensors)
An all-fiber approach is presented to measure surface tension. The experimental realization relies on the use of a specialty fiber, a so-called two-hole fiber (THF), which serves a two-fold purpose: providing a capillary channel to produce bubbles while having the means to measure the power reflected at the end facet of the fiber core. We demonstrate that provided a controlled injection of gas into the hollow channels of the THF, surface tension measurements are possible by simply tracking the Fresnel reflection at the distal end of the THF. Our results show that the characteristic times involved in the bubble formation process, from where the surface tension of the liquids under test is retrieved, can be measured from the train of pulses generated by the continuous formation and detachment of bubbles. View Full-Text
Keywords: surface tension; specialty fiber; fiber optic sensor; optofluidic sensor; remote sensing; optical sensing and sensors surface tension; specialty fiber; fiber optic sensor; optofluidic sensor; remote sensing; optical sensing and sensors
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MDPI and ACS Style

Guzman-Sepulveda, J.R.; May-Arrioja, D.A.; Fuentes-Fuentes, M.A.; Cuando-Espitia, N.; Torres-Cisneros, M.; Gonzalez-Gutierrez, K.; LiKamWa, P. All-Fiber Measurement of Surface Tension Using a Two-Hole Fiber. Sensors 2020, 20, 4219.

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