超声导波焊缝检测中阵列式传感器的信号融合方式研究

针对超声导波焊缝检测中阵列式传感器信号融合的问题,文中根据特征导波在焊缝结构中的传播原理,提出了分时激励的方法对阵列中不同激励单元激励出的信号进行叠加。通过ABAQUS有限元分析软件仿真了不同数量激励晶片组成的传感器阵列直接激励出的检测信号和使用分时激励后激励出的检测信号,并发现多个激励晶片会导致检测信号产生波形杂乱和不规则等现象;而分时激励的方法则减少了信号混杂的情况,且检测信号的能量可以随着激励晶片数量的增加而稳定增加,信号叠加效果更加理想。

The Research of Ultrasonic Wave Signal Fusion on Array Sensors in Weld Detection

Aiming at the problem of signal fusion of array sensor used in ultrasonic guided wave weld detection, the asynchronous excitation was proposed to superimpose the signals from different excitation elements in array sensor through the propagation of characteristic guided wave in weld structure. The ABAQUS finite element analysis software was used to simulate the detection signal directly excited by the sensor array composed of different numbers of excitation chips and the detection signal excited by using time-division excitation. It was found that multiple excitation elements could lead to the disorder and irregularity of the signals, while the asynchronous excitation reduced the mixing of signals, and the energy of the detection signal can be steadily increased as the number of excitation wafers increases, and the signal superposition effect is more ideal. The time-division excitation method reduced the signal mixing, and the energy of the detection signal could be steadily increased as the number of excitation wafers increased, and the signal superposition effect was more ideal.