Development of Phased Array Ultrasonic Inspection Flow RateMeasurement System

研制了一种相控阵超声波流量检测系统。该测量系统采用相控阵技术来降低楔形体中多次反射产生的噪声。然而，相控阵技术有几个难点，其中之一就是关于栅瓣。因此，通过数值分析，设计了阵列传感器来减小栅瓣。通过对阵列传感器发出的声压分布的实验测量，对所制作的阵列传感器的性能进行了评估，得到了控制阵列传感器的最佳参数。开发了以8通道脉冲发生器/接收器和带A/D转换器的PC机为核心的硬件系统和基于相控阵传感器的超声波速度剖面测量系统的软件。软件基于超声多普勒法和自相关法。

A phased array Ultrasonic inspection flow rate measurement system was developed. 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 numerical analysis. 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 with a 8-channel pulser/receiver and a PC with A/D converter, 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.