介绍了一种焊缝内部特定缺陷自身高度的测量方法，可用于平板对接焊缝的检测。该方法采用A型便携式超声检测仪的射频功能，以双晶收-发模式进行检测，通过识别缺陷上、下端点衍射信号，计算缺陷自身高度。采用所提方法对平板对接焊缝验证试块进行检测和解剖验证，结果表明，该方法能够有效检测焊缝内部特定缺陷自身高度，检测误差在±1 mm以内。

A method for measuring the height of specific defects inside the weld was discussed, which can be used for plate butt welding seam detection. This method adopted the radio frequency function of A-type portable ultrasonic detector and detected it in a dual-crystalline pitch-catch mode. By recognizing the upper and lower endpoint diffraction signals of the defect, the height of the defect itself was calculated. The proposed method was used to detect the plate butt weld verification test block and compared with anatomically verification. The test results show that the proposed method can effectively detect the height of specific defects inside the weld, with a detection accuracy of ±1 mm.