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为了探索适合复合材料蜂窝板缺陷检测的红外热像检测法及热像信号处理方法,对蜂窝板的脉冲热像检测(PT)、调制热像检测(MT)及几种热像信号处理方法的缺陷检测能力进行了比较。在脉冲热像检测中,用脉冲相位法进行热像序列处理,并与最佳原始热像进行比较。在调制热像检测中,提出用离散傅里叶级数法和相关系数法进行热像序列处理,并与经典的四点法进行比较。研究结果表明,在蜂窝板脱粘缺陷的检测中,调制热像法的检测效果好于脉冲热像法。在调制热像法的信号处理中,离散傅里叶级数法和相关系数法的应用效果均好于四点法。在最佳调制频率下,以“调制热像-离散傅里叶级数”法进行蜂窝板脱粘缺陷的检测具有最大的缺陷探测能力。
In order to explore the infrared thermal image detection method and the thermal image signal processing method suitable for the honeycomb panel defect detection of composite materials, the pulse thermal image detection (PT), the modulated thermal image detection (MT) and several thermal image signal processing methods Defect detection capabilities were compared. In the pulse thermal imaging detection, the thermal imaging sequence is processed by pulse phase method and compared with the best original thermal image. In the modulation thermal image detection, the thermal image sequence processing is proposed by the discrete Fourier series method and the correlation coefficient method, and compared with the classical four-point method. The results show that the detective effect of modulated thermography is better than that of pulsed thermography in the detection of debonding defects of honeycomb panels. In the modulation thermography method signal processing, the discrete Fourier series method and the correlation coefficient method application effect is better than the four point method. Under the optimal modulation frequency, the detection of debonding defects of honeycomb board with the “Modulation Thermal Image - Discrete Fourier Series” method has the largest defect detection capability.