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为了确定各红外热成像定量测量方法在深度定量测量方面的检测能力,对深度定量测量方法原理进行了分析,并进行了实验研究。通过在碳纤维层压板反面制作平底孔的方法制造已知深度分层缺陷,采用红外热成像方法对已知缺陷进行检测,从理论上分析温差峰值时间、对数温度偏离时间以及对数温度二阶微分峰值时间与缺陷深度的关系,通过分析确定温差峰值时间法、对数温度偏离时间法、对数温度二阶微分峰值时间法对深度进行定量测量方法的适用性,并利用上述方法对已知缺陷进行深度定量测量分析,确定不同方法对深度定量测量的检测适用性及检测能力。实验结果表明,温差峰值时间法测量深度达到2mm,对数温度偏离时间法测量深度达到4mm,对数温度二阶微分峰值时间法测量深度达到5mm,同时对数温度二阶微分峰值时间法受三维热扩散影响小,检测无需选择参考区域。因此,对数温差二阶微分法所能测量的缺陷深度最大,准确性更高。通过对不同方法进行应用分析,能够明确不同深度定量测量方法的适用范围与检测准确性,为主动式红外热成像方法的定量检测提供依据。
In order to determine the capability of quantitative measurement of infrared thermography in depth quantitative measurement, the principle of depth quantitative measurement method is analyzed and the experimental research is carried out. The known deep delamination defects were fabricated by making flat-bottomed holes on the reverse side of carbon fiber laminates. The known defects were detected by infrared thermal imaging method. The temperature difference peak time, logarithmic temperature deviation time and logarithmic temperature second order The relationship between differential peak time and defect depth is analyzed by analyzing the applicability of temperature differential peak time method, logarithmic temperature deviation time method and logarithmic temperature second-order differential peak-time method for quantitative determination of depth. By using the above method, Defect depth quantitative measurement analysis to determine the different methods of depth quantitative measurement of the test of applicability and detection capabilities. The experimental results show that the depth of measurement by the temperature difference peak time method reaches 2mm, the logarithmic temperature deviation time method measures the depth of 4mm, the logarithmic temperature second-order differential peak time method measures the depth of 5mm, and the logarithmic temperature second- Small thermal diffusivity, no need to select the reference area for testing. Therefore, the logarithmic temperature differential second-order differential method can measure the depth of the largest defect, the accuracy is higher. Through the application analysis of different methods, it is possible to clarify the applicable range and accuracy of different depth quantitative measurement methods and provide the basis for the quantitative detection of active infrared thermal imaging method.