针对热障涂层结构材料红外定量检测存在的不足，提出基于脉冲相位的 LM（Levenberg-Marquardt）识别算法。针对研究问题，建立了轴对称圆柱坐标下热障涂层结构材料的瞬态导热模型，利用有限体积法计算出检测表面的温度场，经快速傅里叶变换得到检测表面的相位分布，分析待检测参数对检测表面相位差的影响。以相位为识别条件，采用 LM反演算法对热障涂层厚度及其涂敷下材料内部缺陷位置大小进行定量识别，并采用数值实验方法验证了基于相位的 LM识别方法的有效性。%Aiming at the problems of infrared quantitative detection of thermal barrier coating structures,the LMrecognition algorithm based on pulse phase was put forward.The transient thermal model of thermal barrier coating structures was established in an axisymmetric cylindrical coordinate in view of the research problem.The surface temperature field of the research model was calculated by the finite volume method.Then the phase distribution of the inspection surface was obtained through a fast Fourier transform.The impacts of parameters to be detected on the phase difference of the inspection surface were analyzed.Taking the phase as identification condition,the quantitative identification of coating thickness and material inner defects was conducted by using LM inversion algorithm.The effectiveness of LM identification method on the basis of phase detection was evidenced by the numerical experiment results.
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