红外热波检测复合材料的缺陷深度计算中, 由于其热扩散系数随材料铺层方式及材料温度的不同而不同, 致使缺陷深度不易实现自动测量。为此, 依据一维热传导理论模型, 用非线性拟合方法, 从红外热图序列获取了被测材料的热扩散系数, 结合缺陷深度计算公式, 最终实现对复合材料缺陷深度的自动测量。

To the composite material, its thermal diffusivity is always changed with layer orientations and material temperatures, which makes it difficult to realize the automatic measurement of defect depth of composite material. To solve this problem, a method was provided, the thermal diffusivity of the detected material could be obtained from infrared thermal imaging series with non-linear fitting based on one-dimensional thermal conduction theoretical model, then combining the formula of depth calculatian, automotic measurement of defect depth of composite material was easy to be achieved.