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为获得涂层材料特性,使用光热辐射(PTR)技术进行无损检测,并提出一种基于一维三层PTR理论模型的标定方法,完成了对Al基体钴涂层热学参数、厚度及分布的检测。三层PTR理论模型,由涂层、空气缺陷层和基体组成。搭建了实验平台,对两种不同厚度的钴(Co)涂层Al基体样品、无涂层Al基体参考样品进行了多点PTR测量。利用参考样品对带涂层样品PTR相位信号进行规格化,以消除检测系统的影响。通过多参数优化算法,对规格化后相位信号进行拟合,完成三层理论模型公式热参数的标定,求出了涂层材料的热传导率和热扩散系数,进而计算得到各检测点涂层厚度及分布。实验结果验证了理论模型的正确性,以及材料作为基体和涂层时其热学性能的值会发生改变。
In order to obtain the characteristics of coating materials, non-destructive testing using photothermal radiation (PTR) was proposed. A calibration method based on one-dimensional three-layer PTR model was proposed. The thermal parameters, thickness and distribution of the Al matrix cobalt coating Detection. The three-layer PTR theoretical model consists of a coating, an air-impermeable layer and a matrix. An experimental platform was set up and multi-point PTR measurements were performed on two different cobalt (Co) coated Al matrix samples and uncoated Al matrix reference samples. The reference sample was used to normalize the coated PTR phase signal to eliminate the effects of the detection system. Through the multi-parameter optimization algorithm, the normalized phase signal is fitted to calibrate the thermal parameters of the three-layer theoretical model formula, and the thermal conductivity and thermal diffusivity of the coating material are calculated. Then the coating thickness And distribution. The experimental results verify the correctness of the theoretical model and the change of the thermal properties of the material as a matrix and coating.