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为探索脉冲红外热成像技术用于检测耐热合金涂层结构内部缺陷的方法,采用有限元仿真和实验研究相结合的方法,对含有盲孔缺陷的耐热合金涂层结构试件进行检测研究。通过有限元仿真分析脉冲热流在被测构件中的传递过程,为检测实验中采样频率和采样时间的确定提供理论依据。利用高能脉冲闪光灯作为激励源对试件进行加热,通过FLIR SC7000系列红外热像仪采集图像序列,采用FCA法、PPT法和PCA法对原始图像序列进行处理。实验结果表明,在给定检测参数下,PPT法和PCA处理后的图像信噪比显著增强,可实现耐热合金涂层结构内部缺陷的可靠检测。
In order to explore the method of pulsed infrared thermography for the detection of internal defects in the heat-resistant alloy coating structure, the finite element simulation and experimental study are combined to test the heat-resistant alloy coated structural specimens with blind hole defects . Through the finite element simulation of pulse heat flow in the measured components of the transfer process for the detection of sampling frequency and sampling time to provide a theoretical basis. The high-energy pulse flash lamp was used as the excitation source to heat the specimen. The image sequence was acquired by FLIR SC7000 series thermal imager. The original image sequences were processed by FCA, PPT and PCA methods. The experimental results show that the signal-to-noise ratio of PPT and PCA is significantly enhanced under the given detection parameters, which can reliably detect the internal defects of the heat-resistant alloy coating structure.