In order to avoid the deficiencies indefect-depth identification with traditional pulse phase thermography, an inverse method based on the phases of the inspection surface was presented. The effects of the initial guess, modulation time, and error in temperature measurement on the identification were analyzed. The study shows that the identification of defect depth has high accuracy, and the effects of the initial guess and the modulation time on the identification of defect depth can be ignored without measurement error. The accuracy of the identification result would decrease with an increase in the random error, but the uniform error would not change the accuracy of the result. A result with high accuracy was obtained even with a greater random error. The study shows that the identification of defect depth by phase differences is feasible.%为了改进传统脉冲相位检测法在缺陷深度检测中存在的不足,提出了利用检测表面相位信息来进行缺陷深度反演识别的方法,研究了初始假设、窗口时间以及测温误差对缺陷深度识别的影响.研究结果表明在无测温误差时,在不同初始假设、缺陷深度和窗口时间下,缺陷深度都准确的识别;识别精度会随随机误差的增大而减小而均匀误差不改变识别精度,并且在较大的随机误差下仍有较好的识别精度,表明了利用检测表面相位进行缺陷深度反演辨识的可行性.
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