可产生“任意”超声检测信号的方法
Method to produce ‘arbitrary’ ultrasonic test signals
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摘要: 提出了一种实现超声检测中期望检测信号的方法。该方法采用自适应滤波解卷积计算获得期望检测信号所需的激励信号,通过将该激励信号施加在检测系统上获得期望的检测信号,达到检测信号的可控可调。实验获得了时宽带宽积达33的线性调频检测信号和信噪比达18.1 dB的单周期检测信号,达到期望要求。仿真分析表明,所实现的检测信号信噪比将随检测系统带宽的增加而增加。该方法可用于产生与检测目标相匹配的检测信号,提高超声检测性能。Abstract: A method to produce an appointed test signal in ultrasonic testing is proposed.Based on a given system, the exciting signal used to produce the desired test signal is obtained by adaptive filtering deconvolution.By inputting the exciting signal,the output of the system is the desired test signal.So this method can make test signals controllable and adjustable.Experiment results show that the linear frequency modulation test signal with a time bandwidth product nearly 33 and the one-period test signal with the signal noise ratio up to 18.1 dB are realized successfully.The influence of the system bandwidth on these test signals is also discussed.The simulation results indicate that the signal noise ratio of the test signals is higher as the system bandwidth is wider.The method is useful to produce test signals matched to test targets,thus the performance of ultrasonic test can be improved.