锁相红外检测中相位检测方法  

Study of Phase Detection in Lock-in Thermography Nondestructive Testing

作　　者：汪子君[1] 刘俊岩[2] 戴景民[1] 王扬[2] 

机构地区：[1]哈尔滨工业大学自动检测与过程控制系统研究所,哈尔滨150001 [2]哈尔滨工业大学机械制造及自动化系,哈尔滨150001

出　　处：《无损检测》2008年第7期418-421,共4页Nondestructive Testing

基　　金：黑龙江省重点攻关资助项目(GB06A512)

摘　　要：介绍了调制加热阶段的一维热波导热方程。为了减少图像序列采集数量,针对相位法红外热成像检测提出了获取热波信号相位信息的方法,即相关检测算法。利用噪声信号与参考信号不相关的原理,有效地提取微弱被测信号。通过对同一组图像序列的处理,将其与4点平均算法比较,证实该算法采集信息少,具有较高检测精度。同时也验证了相位信息对样品表面非均匀性不敏感,使得相位法红外热像技术在无损检测中有广泛应用。One-dimensional heat conduction equation of thermal wave during modulated heating was described.A method,correlation algorithm,was promoted to detect phase information in lock-in thermography nondestructive testing in order to reduce sample images.Using the principle of the reference signal being uncorrelated to the measured signal,the latter could be extracted easily.Compared with averaging four-point algorithm,correlation algorithm was shown to have better precision and need less information.The experimen...

关 键 词：红外热成像检测 锁相 相关算法 相位检测 

分 类 号：TG115.28[金属学及工艺—物理冶金]