基于 Lamb 波的数据传输与缺陷检测同步实现方法

在结构健康监测领域，超声导波相对于体波具有传输距离远、覆盖范围大、检测成本低的优点。提出了一种基于Lamb波的数据传输与缺陷检测同步实现方法，实现了超声系统的多功能复用。通过理论仿真与扫频实验验证了Lamb波模态调制理论，使用压电晶片主动传感器在铝板上以500 kHz的中心频率激发出S₀模态Lamb波进行数据传输和缺陷检测。针对Lamb波边界反射引起的码间串扰问题，采用移不变稀疏编码方法进行信息恢复，在具有反射边界的铝板上成功实现100 kbps的信息传输速率，并且误码率为0。同时，利用移不变稀疏编码中的原子信号进行结构缺陷检测，根据合成孔径聚焦技术实现了缺陷的准确定位，定位误差小于0.2%。

A synchronous implementation method of data transmission and defect detection based on Lamb waves

In the field of structure health monitoring, compared to body waves, ultrasonic guided waves have advantages of long transmission distance, large coverage, and low inspection cost. This article proposes a synchronous implementation method of data transmission and defect detection based on Lamb waves, which realizes the multi-functional multiplexing of the ultrasound system. The Lamb wave mode tuning theory is evaluated by the theoretical simulation and frequency sweeping experiments. A piezoelectric wafer active sensor is used to excite S0 mode Lamb waves on the aluminum plate at a center frequency of 500 kHz for data transmission and defect detection. To solve the cross-talk problem caused by Lamb wave boundary reflection, a shift-invariant sparse coding method is used to recover the information. The information transmission rate of 100 kbps is successfully achieved on the aluminum plate with reflected boundary, and the bit error rate is 0. Meanwhile, atomic signals in shift-invariant sparse coding are used to detect structural defects. The precise location of defects is realized according to synthetic aperture focusing technology, and the positioning error is less than 0. 2% .