摘要
针对激光扫描红外热波成像无损检测技术,重点介绍了其理论基础、检测原理、温度-时间曲线;建立了激光扫描热传导模型,运用傅里叶变换法求出了激光扫描无限厚样品表面温度场分布,并采用镜像热源法得到了激光扫描有限厚样品表面的温度场分布。在此基础上得出,根据材料热导率的不同,当激光的扫描速度达到合适的范围时,样品表面温度-时间曲线基本服从脉冲热激励的一维热传导模型,为激光扫描热波成像技术的发展提供了理论基础。
For the nondestructive testing of the laser scanning infrared thermography,description is focused on its theory,detection principle,and the temperature-time dependence.A 2-D heat transfer model was established.The surface temperature distribution for infinite thick sample was calculated by using Fourier transform,and temperature field distribution for finite thick sample was obtained by using the method of mirror imaging.Based on this theory,it is concluded that depending on the thermal conductivity of the sample,for certain range of the laser scanning speed,the surface temperature variation is the same as the 1-D heat transfer model.This establishes the theoretical foundation for the laser scanning infrared thermography.
出处
《无损检测》
2014年第11期24-27,共4页
Nondestructive Testing
关键词
激光扫描红外热波成像
温度场
无损检测
Laser scanning infrared thermography
Temperature field
Nondestructire testing
