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Sensors 2017, 17(9), 2015; https://doi.org/10.3390/s17092015

A Hot-Polymer Fiber Fabry–Perot Interferometer Anemometer for Sensing Airflow

1
Department of Electro-Optical Engineering, National United University, Miaoli 360, Taiwan
2
Department of Electrical Engineering, National United University, Miaoli 360, Taiwan
*
Author to whom correspondence should be addressed.
Received: 9 August 2017 / Revised: 30 August 2017 / Accepted: 1 September 2017 / Published: 2 September 2017
(This article belongs to the Special Issue Optical Fiber Sensors 2017)
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Abstract

This work proposes the first hot-polymer fiber Fabry–Perot interferometer (HPFFPI) anemometer for sensing airflow. The proposed HPFFPI is based on a single-mode fiber (SMF) endface that is attached to a UV-cured polymer to form an ultracompact fiber Fabry–Perot microcavity. The proposed polymer microcavity was heated using a low-cost chip resistor with a controllable dc driving power to achieve a desired polymer’s steady-state temperature (T) that exceeds the T of the surrounding environment. The polymer is highly sensitive to variations of T with high repeatability. When the hot polymer was cooled by the measured flowing air, the wavelength fringes of its optical spectra shifted. The HPFFPI anemometers have been experimentally evaluated for different cavity lengths and heating power values. Experimental results demonstrate that the proposed HPFFPI responses well in terms of airflow measurement. A high sensitivity of 1.139 nm/(m/s) and a good resolution of 0.0088 m/s over the 0~2.54 m/s range of airflow were achieved with a cavity length of 10 μm and a heating power of 0.402 W. View Full-Text
Keywords: fiber-optic sensors; fiber-optic components; Fabry–Perot; polymers; optical sensing and sensors; interferometry fiber-optic sensors; fiber-optic components; Fabry–Perot; polymers; optical sensing and sensors; interferometry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lee, C.-L.; Liu, K.-W.; Luo, S.-H.; Wu, M.-S.; Ma, C.-T. A Hot-Polymer Fiber Fabry–Perot Interferometer Anemometer for Sensing Airflow. Sensors 2017, 17, 2015.

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