脉冲红外热波检测是一种新兴的无损检测技术，通常采用反射型激励方式。针对反射法缺陷深度检测误差大的不足，系统分析了透射法的红外脉冲热波定量检测缺陷深度。通过分析材料在脉冲热激励下的一维热传导模型，探讨了缺陷深度的红外测量原理。利用表面温度一阶微分峰值时间法建立特征时间与缺陷深度的关系，实现对缺陷深度的定量检测。以PVC板人工楔形槽缺陷为例，采用透射法与反射法对比实验分析缺陷深度的测量误差。结果表明，反射法在对缺陷进行定量计算时需要选取参考区域，而透射法对数据的处理不依赖参考区域，避免参考区域所带来的误差。透射法直接加热缺陷面，响应时间短，通过求解缺陷处的特征时间计算缺陷深度，检测精度得到大幅度提高。

Pulsed infrared thermal wave testing, which typically uses reflective-type incentives, is a new non-destructive testing technology. In view of the reflection method with big defect depth quantitative detection error, transmission infrared thermal wave method was systematically analyzed in order to improve the detection precision. The principle of infrared measurement of defect depth was discussed by analyzing the material in pulsed thermal excitations of one-dimensional heat transfer model. The relationship between the characteristics of time and defect depth was established by the peak time method of the first order differential of surface temperature, so the quantitative detection on the depth of defect was realized. The sample of PVC flat with artificial slot wedge defects was used. The depth of defects were detected by comparative experiments between transmission and reflection methods, and the measurement errors were analyzed. The results show that reflection method in quantitative calculation for defects requires selecting reference region, while transmission method does not rely on the reference avoiding the error resulted from it. Moreover, transmission method directly heats surface defects, so short response time can be obtained and the defect depth precision are improved greatly by solving the characteristic time of the defect.