Development of Phased Array Ultrasonic Inspection Flow RateMeasurement System

研制了一种相控阵超声波探伤流量测量系统。该测量系统采用相控阵技术，以减少噪声的多次反射发生在一个楔。然而，相控阵技术有几个难点，其中之一是栅瓣。因此，阵列传感器的设计，以减少栅瓣使用数值分析。通过实验测量阵列传感器发出的声压分布来评估所制造的阵列传感器的性能，并获得控制阵列传感器的最佳参数。研制了以8通道脉冲发生器/接收器和带A/D转换器的PC机为核心的相控阵超声波速度剖面测量系统的硬件和软件。该软件是基于超声多普勒方法与自相关法。

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.