시분할 방식을 이용한 3차원 초음파 풍향풍속계 측정기술 개발
Development of 3 - Dimensional Ultrasonic Wind Direction Anemometer Measurement Technique Using Time Division Method
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초록
The three dimensional ultrasonic anemometer was constructed to reduce the disadvantages of the two-dimensional anemometer and to be free from the use environment. Three pairs of transmitting and receiving ultrasonic sensors were designed to face each other atan angle of 45° to the upper and lower surfaces at intervals of 120°. 200 kHz ultrasonic sensor Oscillation, transmission and reception,level detection, power supply circuit were designed and U, V, W wind speed vector components were obtained by measuring the time of first received ultrasonic pulse by transmitting pulse ultrasound. It is implemented as firmware in ARM Coretex-M3 processor so that horizontal and vertical wind direction and wind speed can be converted into digital signal by vector calculation. In this study, The three-dimensional ultrasonic anemometer can complement the disadvantages of the two-dimensional anemometer (mechanical and ultra-sonic), and it is expected to gradually replace the two-dimensional anemometer due to its high utilization rate by collecting additional information such as vertical wind.
Abstract
The three dimensional ultrasonic anemometer was constructed to reduce the disadvantages of the two-dimensional anemometer and to be free from the use environment. Three pairs of transmitting and receiving ultrasonic sensors were designed to face each other atan angle of 45° to the upper and lower surfaces at intervals of 120°. 200 kHz ultrasonic sensor Oscillation, transmission and reception,level detection, power supply circuit were designed and U, V, W wind speed vector components were obtained by measuring the time of first received ultrasonic pulse by transmitting pulse ultrasound. It is implemented as firmware in ARM Coretex-M3 processor so that horizontal and vertical wind direction and wind speed can be converted into digital signal by vector calculation. In this study, The three-dimensional ultrasonic anemometer can complement the disadvantages of the two-dimensional anemometer (mechanical and ultra-sonic), and it is expected to gradually replace the two-dimensional anemometer due to its high utilization rate by collecting additional information such as vertical wind.
참고문헌 (7)
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- 박도현, "위상측정방식을 이용한 3차원 초음파 풍향풍속계의 특성분석", 센서학회지, 15(6), pp.442~448 (2006), 한국센서학회
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- A. Grelle, "Flow distortion by asolent sonic anemometer : wind tunnel calibration and its assessment for flux measurements over forest and field", J. Atmos. Ocean. Technology, 11, pp.1529~1542 (1994)
- L. Svilainis, "Measurement of complex impedance of ultrasonic transducers", Ultragarsas, 1(62), pp.26~29 (2007)