【摘要】 复合材料及粗晶材料等各向异性材料的超声无损检测存在信噪比较低的问题,通过自适应滤波技术可提高缺陷回波信噪比.在此,利用了自适应噪声抵消过程中广泛应用的带延迟的有限冲击响应滤波器(FIR)和最小均方误差(LMS)算法.更多还原

【Abstract】 There exists a problem of lower signal-to-noise ratios (SNR) for the process of ultrasonic nondestructive evaluation of large grained or composite materials. It’s possible to enhance SNR by means of the principle of adaptive filtering. The adaptive filter presented here based on FIR with delay structures and LMS algorithm is developed from the widely used technique of adaptive noise cancellation.更多还原