【作者】 吕清华；

【Author】 LV Qing hua (Department of Information Engineering, Nanjing Institute of Meteorology, Jiangsu Nanjing 210044, China)

【机构】 南京气象学院；

【摘要】 在时差式超声波流量计中,超声波到达传感器的时间点即超声波信号到达时间点在时间轴上的位置的检测对流体流速、流量的计算非常重要。本文运用了小波的奇异点定位功能,将希尔伯特变换和小波分析结合起来,并通过对仿真数据进行处理来说明这种方法的有效性。更多还原

【Abstract】 The first zero-crossing point detection of received ultrasonic signal through ultrasonic transducers attached importance to the calculation of flow velocity and flux during time-difference-type ultrasonic flowmeter designing. Due to the properties of received signal, a combination of singular point detection based on wavelet analysis and Hilbert transform is shown in this paper. The validity is shown by processing the real acquired ullrasonic data using this method.更多还原