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本文的目的在于探索一种新的适用于红外热波检测技术的热激励方式一太赫兹(THz)热激励.文中介绍了THz波周期性热激励的热传导理论模型;尝试利用返波振荡器(返波管backward wave oscillator,BWO)太赫兹源对一块碳纤维基底吸波涂层板进行周期性THz热激励,红外热像仪连续观测和记录试件表面温场变化,Canny边缘算法处理热图像显示缺陷;检测结果与闪光灯脉冲激励的结果进行比较,讨论了太赫兹波激励红外热波检测技术可能的优势.实现了THz技术与红外热波无损检测技术的结合.
The purpose of this paper is to explore a new thermo-stimulus THz thermal excitation technique suitable for the infrared thermal wave detection technology.The theoretical model of thermal conduction of the THz periodic thermal stimulus is presented in this paper. The THz thermal excitation was performed on a piece of carbon fiber substrate with wave absorbing coating. The thermal imager continuously observed and recorded the temperature field of the specimen. The Canny edge algorithm processed the thermal image The results are compared with the result of flash pulse excitation, and the possible advantages of THz wave excitation infrared thermal wave detection technology are discussed. The combination of THz technology and infrared thermal wave nondestructive detection technology is realized.