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基于频率波数域过滤的波场分离方法场常被用来从波场数据中提取反射波的波场,但由于检测误差的存在,该方法获得的反射波波场中噪声较多。利用高分辨率的激光超声检测,实现了铝板中超声导波波场的可视化,并将波场中相邻信号时间匹配后做差以弱化入射波,而后使用频率波数域过滤的方法对入射波进行深度过滤,对反射波波场进行有效提取。实验结果表明,利用该手段进行二次过滤提取的反射波波场轮廓清晰,所含噪声少。
The method of wave field separation based on frequency wave number domain filtering is often used to extract the wave field of the reflected wave from the wave field data. However, due to the detection error, the reflected wavefield obtained by this method has more noise. By using high-resolution laser ultrasonic testing, the visualization of the ultrasonic guided wavefield in the aluminum plate is realized, and the adjacent signals in the wavefield are time-matched to weaken the incident wave. Then, the method of filtering the frequency wave-number domain is used to measure the incident wave Depth filtering, the reflected wavefield effective extraction. The experimental results show that the wavefield of the reflected wavefield extracted by this method is clear and contains little noise.