Zhang Hui, Liang Dongmei, Rui Xiaobo, Wang Zhuochen
State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin 300072, China.
Sensors (Basel). 2021 Jan 17;21(2):609. doi: 10.3390/s21020609.
Noncontact ultrasonic detection technology is an effective method to detect damage in time. This paper proposes a noncontact damage detection system based on air-coupled ultrasound and full-field laser vibrometer, which realizes the excitation of relatively single-mode guided waves and the wavefield automatic detection. The system performance is verified through experiments, and the experimental wavenumber is consistent with the theoretical dispersion characteristics of the Lamb wave in the A0 mode. Based on this system, the topography reconstruction algorithms, including the Wavenumber Filtering Algorithm and Spatial Wavenumber Algorithm, were tested and compared with the aluminum alloy plate and the carbon fiber reinforced polymer plate. The results show that, based on the air-coupled ultrasound and full-field laser vibrometer detection system, the Spatial Wavenumber Algorithm has better imaging error and contrast, and the damage edge detection is smoother.
非接触式超声检测技术是一种及时检测损伤的有效方法。本文提出了一种基于空气耦合超声和全场激光测振仪的非接触式损伤检测系统，该系统实现了相对单一模式导波的激励和波场自动检测。通过实验验证了系统性能，实验波数与兰姆波A0模式的理论频散特性一致。基于该系统，对包括波数滤波算法和空间波数算法在内的形貌重建算法进行了测试，并与铝合金板和碳纤维增强聚合物板进行了比较。结果表明，基于空气耦合超声和全场激光测振仪检测系统，空间波数算法具有更好的成像误差和对比度，损伤边缘检测更平滑。
