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在传热学的基础上建立涂层试样的一维热传导模型,确立了涂层厚度与表面温度差值-帧数直线的斜率、截距以及涂层热扩散率之间的定量关系。以不同厚度的热障涂层试样为例,采用新型脉冲激光透射法激励,对热像仪采集到的不同激励功率下涂层表面温度差值-帧数曲线线性拟合,求得拟合直线的斜率和截距值,最后计算得到热障涂层厚度值,结果表明:激光透射法红外热波检测技术能很好地应用于热障涂层厚度的快速、精确、非接触检测。
Based on the heat transfer theory, a one-dimensional heat conduction model of the coating sample was established. The relationship between the thickness of the coating and the surface temperature-the slope of the line of the frame number, the intercept and the thermal diffusivity of the coating was established. Taking the samples of different thickness of thermal barrier coatings as an example, a new pulse laser transmission method was used to simulate the temperature difference of coating surface under the different excitation power collected by the thermal imager. The slope and the intercept of the straight line were calculated and the thickness of the thermal barrier coating was calculated. The results show that the laser transmission infrared thermal wave detection technology can be applied to the rapid, accurate and non-contact detection of the thermal barrier coating thickness.