基于温度自适应的超声波渡越时间测量方法研究

摘要

该文对超声波换能器模型法、噪声抑制法和渡越时间法的优缺点进行分析,针对其不足提出一种基于温度自适应的超声波渡越时间测量方法,采用两对换能器分别与中轴线垂直、成锐角安装,对换能器模型分析、滤波算法、自适应跟踪算法研究,得到压电-电压等效数学模型完成辨识;通过等效模型完成自适应滤波算法、基于阈值法及互相关理论完成渡越时间自动跟踪算法设计.通过实验数据验证本方法对解决超声波传播衰减大、声学噪声干扰严重等问题是可行的.%The advantages and disadvantages of model method, noise suppression method and time-of-flight method of ultrasonic transducer are analyzed, and a temperature-adaptive method for measuring time-of-flight is proposed.Two pairs of transducers are installed vertically and acutely with the central axis respectively.The transducer model analysis, filtering algorithm and adaptive tracking algorithm are studied, and the piezoelectric-voltage equivalent mathematics is obtained.The identification of the model is completed, and the adaptive filtering algorithm, the automatic tracking algorithm of the transit time based on threshold method and cross-correlation theory are designed by the equivalent model.The experimental data prove that this method is feasible to solve the problems of large attenuation of ultrasonic propagation and serious acoustic noise interference.