Two Capacitive Micro-Machined Ultrasonic Transducers for Wind Speed Measurement.
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.
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Jiangong Road, Sanmin District, Kaohsiung 807, Taiwan. 1100403116@gm.kuas.edu.tw.
Gia Thinh
GT
Bui
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Jiangong Road, Sanmin District, Kaohsiung 807, Taiwan. x59262002@gmail.com.
Yu-Tsung
YT
Jiang
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Jiangong Road, Sanmin District, Kaohsiung 807, Taiwan. pang@kuas.edu.tw.
Da-Chen
DC
Pang
amplitude; capacitive micro-machined ultrasonic transducer (CMUT); time-of-flight; wind speed measurement