中文摘要：

调制红外热波无损检测是一种可以检测材料内部缺陷的先进技术,在固体火箭发动机包覆层脱粘的诊断中有一定的应用前景。以有限元法对固体火箭发动机包覆层脱粘的调制红外热波检测法进行数值模拟,研究加热条件和结构对可检测性的影响。得出可检信息参数（表面过余温度幅值、相位和相位差）随热波激励条件（调制频率、热流强度）和结构参数（材料、缺陷大小、深度、厚度等）变化的规律。针对典型材料和结构尺寸,给出最佳调制频率、盲频以及相位差的预测值。调制红外热波检测法可用于固体火箭发动机包覆层脱粘的无损检测,检测条件可通过计算机仿真来优化。

英文摘要：

Modulated infrared thermal wave nondestructive testing（IR NDT） is an advanced technique of internal flaw inspection,and has certain application prospect in detecting cladding debond in solid rocket motors（SRM）.The numerical simulation of modulated IR NDT for cladding debond in SRM is carried out by using finite element method,and the influences of heating condition and structure on the detectability are studied.The evolutions of informative parameters（i.e.the amplitude,phase and phase difference of surface excessive temperature） versus heating condition（i.e.the modulation frequency and heat flow intensity） and structural parameters（i.e.materials,defect size,depth and thickness） are obtained.The optimal modulation frequency,blind frequency and phase difference for typical material and structural size are predicted.Modulated thermography can be used in detecting cladding debond in SRM,and the test condition can be optimized through computer simulation.