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Proceedings Paper

Fiber optic anemometer based on silicon Fabry-Pérot interferometer
Author(s): Guigen Liu; Weilin Hou; Wei Qiao; Ming Han
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Paper Abstract

Flowmeters have been finding vast applications in all kinds of industrial processes, such as process control, food quality surveillance, wind turbines, environment monitoring, etc. In this paper, we propose a new anemometer which consists of a Fabry-Pérot interferometer (FPI) implemented using a thin silicon mounted on the tip of an optical fiber. The anemometer takes advantage of the superior thermal and optical properties of silicon. Silicon is transparent to infrared wavelength, while it absorbs visible light. Thus, the silicon FPI can be heated by a beam injected from a red diode laser while the infrared signals go through it without any interference from the heating light. The heat loss from the silicon film will increase when the sensor is placed in stronger flow (wind), which induces a decrease in the optical path of the silicon FPI, which lead to blueshifts the output spectrum. A higher wind speed corresponds to a larger wavelength shift. By tuning the heating power, the response range and sensitivity of the anemometer is changed. Experimental results demonstrate that a wavelength shift -0.574 nm was observed for a wind speed of 4 m/s. Better sensitivity is to be expected when stronger heating applied. The proposed sensor also features simple structure, low cost and fast response.

Paper Details

Date Published: 13 May 2015
PDF: 5 pages
Proc. SPIE 9480, Fiber Optic Sensors and Applications XII, 94800A (13 May 2015); doi: 10.1117/12.2180258
Show Author Affiliations
Guigen Liu, Univ. of Nebraska-Lincoln (United States)
Weilin Hou, U.S. Naval Research Lab. (United States)
Wei Qiao, Univ. of Nebraska-Lincoln (United States)
Ming Han, Univ. of Nebraska-Lincoln (United States)

Published in SPIE Proceedings Vol. 9480:
Fiber Optic Sensors and Applications XII
Gary Pickrell; Eric Udd; Henry H. Du, Editor(s)

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