C213 フェイズドアレイ超音波流速分布計測法を用いた流量計測に関する研究(OS9 熱・流動(4))

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  • C213 A Study of Phased Array Ultrasonic Velocity Profile Method for Flow Rate Measurement

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A measurement system with phased array ultrasonic velocity profile method was developed to improve accuracy of flow rate measurements. This measurement system employs phased array technique to reduce noise from multiple reflections which occurs in a wedge. However, phased array technique has several difficulties - one of them is about grating lobes. Thus, the array sensor was designed to reduce the grating lobes using simple calculations Performance of the manufactured array sensor was evaluated by experimental measurements of sound pressure distribution emitted from the array sensor, and optimal parameters to control the array sensor were obtained. Hardware and software of the ultrasonic velocity profile measurement system with a phased array sensor were also developed. The software is based on ultrasonic Doppler method with autocorrelation method Velocity profiles of horizontal pipe flow were measured using the developed system, and the availability of the system applying a phased array sensor was confirmed.

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