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Sensors 2016, 16(6), 814; doi:10.3390/s16060814

Two Capacitive Micro-Machined Ultrasonic Transducers for Wind Speed Measurement

Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Jiangong Road, Sanmin District, Kaohsiung 807, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Xiaoning Jiang
Received: 7 April 2016 / Revised: 27 May 2016 / Accepted: 30 May 2016 / Published: 2 June 2016
(This article belongs to the Section Physical Sensors)
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This paper presents a new wind speed measurement method using a single capacitive micro-machined ultrasonic transducer (CMUT). The CMUT was arranged perpendicular to the direction of the wind flow, and a reflector was set up a short distance away, facing the CMUT. To reduce the size, weight, cost, and power consumption of conventional ultrasonic anemometers this study proposes two CMUT designs for the measurement of wind speed using either the amplitude of the signal or the time of flight (TOF). Each CMUT with a double array element design can transmit and receive signals in five different operation modes. Experiments showed that the two CMUT designs utilizing the TOF were better than those utilizing the amplitude of the signal for wind speed measurements ranging from 1 m/s to 10 m/s, providing a measurement error of less than 0.2 m/s. These results indicate that the sensitivity of the TOF is independent of the five operation modes. View Full-Text
Keywords: capacitive micro-machined ultrasonic transducer (CMUT); wind speed measurement; amplitude; time-of-flight capacitive micro-machined ultrasonic transducer (CMUT); wind speed measurement; amplitude; time-of-flight

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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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Bui, G.T.; Jiang, Y.-T.; Pang, D.-C. Two Capacitive Micro-Machined Ultrasonic Transducers for Wind Speed Measurement. Sensors 2016, 16, 814.

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