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针对超声衍射时差(TOFD)方法中由于存在甩弧现象导致缺陷长度测量误差大的问题,借助CIVA仿真软件及合成孔径聚焦技术(SAFT),对长度范围5.0~45.0mm的9个矩形槽的D扫图像进行处理与重建。结果表明,D-SAFT处理技术能够有效降低干扰衍射信号的影响,使缺陷甩弧现象减弱甚至消失,缺陷最大测量误差由处理前的最大5.0mm降低至0.6mm。此外,对Farhang等人提出的变角度解卷积(ADD)结合SAFT方法(SAFTADD)在提高TOFD缺陷定量精度上的应用前景进行了展望。
Aiming at the problem of large measurement error of the defect length caused by the phenomenon of rejection due to the phenomenon of rejection in the ultrasonic diffraction time difference (TOFD) method, the D Scan images for processing and reconstruction. The results show that the D-SAFT processing technique can effectively reduce the influence of interference diffraction signals and weaken or even eliminate the phenomenon of defect rejection. The maximum measurement error of the defect is reduced from the maximum of 5.0 mm to 0.6 mm. In addition, the prospects of improving the quantitative accuracy of TOFD defects by Farhang et al. Proposed by combining variable angle deconvolution (ADD) with SAFT method (SAFTADD) are also discussed.