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本文以激光扫描技术、红外技术及电子技术为基础， 研究并设计了一套激光扫描自动热激励红外无损检测系统。利用该装置， 可以无损检测金属材料零部件的内部缺陷， 如微裂纹、疏松、气孔等。文中还介绍了检测系统的工作原理， 利用ＣＯ２ 激光器扫描对被检工件进行自动加热预处理， 再通过红外技术接收工件热传导的温度场分布变化等信息， 经过电子滤波及Ａ／ Ｄ 转换， 送入单片微机进行数据分析、处理、存储、显示， 达到探测工件内部缺陷的性质和特征的目的。
Based on laser scanning technology, infrared technology and electronic technology, this paper studies and designs a laser scanning automatic thermal excitation infrared nondestructive testing system. With this device, it is possible to non-destructively detect internal defects of metal material parts such as microcracks, looseness, porosity and the like. The paper also introduces the working principle of the detection system, the use of CO2 laser scanning of the workpiece to be tested for automatic heating pretreatment, and then through the infrared technology to receive the workpiece thermal conductivity of the temperature field distribution changes and other information through electronic filtering and A / D conversion, into Single-chip microcomputer for data analysis, processing, storage, display, to detect the nature and characteristics of the internal defects of the workpiece purpose.