超声无损检测为航空航天、石油化工、轨道交通等领域的设备正常运行提供保障，具有十分重要的意义。横波超声检测因其振动模态衰减小、传播速度低、空间分辨率高等优势成为固体内部缺陷检测的重要手段。然而，常规的超声换能器因压电晶片的振动特性，无法直接发射和接收横波，需要借助斜入射折射出横波。由于斜入射的特殊性，需要同时考虑折射效应和斜面检测的问题，这给超声成像重建计算增加了负担。为此，提出一种超声扫查横波成像的波数域快速重建技术。该方法在传统波数域超声图像重建技术的基础上，结合波数域坐标变换以及横波波场外推实现斜入射横波成像的快速重建。仿真和实验结果表明，利用本文方法，在以20°~60°左右的折射角检测横通孔、裂纹和半球面平底孔时，均能展现优良的检测效果。并且相较于时域合成孔径聚焦技术，在不损失重建精度的条件下，该方法的计算效率至少提高100倍。

Ultrasonic nondestructive testing is of great significance to ensure the working of equipment in aerospace, petrochemical, railway, and other fields. Transverse wave ultrasonic testing is an important method for the detection of internal defects in solids due to its advantages of weak attenuation of vibration mode, low sound speed, and high spatial resolution. However, due to the vibration characteristics of piezoelectric wafers, conventional ultrasonic transducers cannot directly transmit and receive transverse waves and need to refract the transverse waves with the help of oblique incidence, and due to the particularity of oblique incidence, it is necessary to consider the refraction effect and slope detection simultaneously, which increases the burden of ultrasonic imaging reconstruction calculation. Therefore, a wavenumber-domain fast reconstruction technique using ultrasonic scanning for transverse waves is proposed. The method is built based on classical synthetic aperture focusing technology (SAFT) by integrating the coordinate transformation in wavenumber domain and transverse wave wavefield extrapolation for the application of oblique incidence transverse wave imaging. The simulation and experimental results show that the proposed method can build excellent detection results when detecting transverse holes, cracks, and hemispherical flat-bottom holes with refraction angles from 20° to 60°. Compared with the time-domain synthetic aperture focusing technique, the computational efficiency of this method is improved by at least 100 times without losing the reconstruction accuracy.