基于横向热传导的下表面缺陷检测  

Detection of subsurface defects based on lateral heat conduction

作　　者：邢晓军[1,2] 左宪章[1] 沈思 XING Xiao-jun ZUO Xian-zhang SHENSi(Department of UAV Engineering, Ordnance Engineering College, Shijiazhuang 050003, China The Chinese People＇ s Liberation Army 63810, Wenchang 571300, China Department of Training Course,Armed Police Shijiazhuang Petty Officer School,Shijiazhuang 050061, China)

机构地区：[1]军械工程学院无人机工程系 [2]中国人民解放军63810部队 [3]武警石家庄士官学校训练部

出　　处：《激光与红外》2017年第6期710-716,共7页Laser & Infrared

基　　金：河北省自然科学基金项目(No.E2014506011)资助

摘　　要：脉冲涡流热成像缺陷检测技术可以对铁磁性材料试件进行快速准确地检测。针对下表面裂纹检测比较困难的问题,本文利用横向热传导的方法检测缺陷。结果表明,下表面裂纹能阻碍热量的横向传递,深度越大阻碍作用越强。通过对采样温度进行标准化处理,试件内部初始温度不同对检测结果带来的影响得到抑制,提高了缺陷检测效率。横向热传导是检测下表面缺陷的一种有效方法。Pulsed eddy current thermography technology for defect detection can detect ferromagnetic specimen quickly and accurately, but it is difficult to detect cracks under surface. Aiming at this problem, a method of lateral heat con- duction is used to detect these defects. The results show that the inner cracks can hinder the lateral transfer of heat, and the deeper crack has the stronger hamper effect. The sample temperature is normalized, which can suppress the influence of specimen with different initial temperatures and improve detection efficiency. Lateral heat conduction is an effiective method to detect defect ont the under surface.

关 键 词：脉冲涡流热成像 横向热传导 数据标准化 下表面缺陷 

分 类 号：TG115.28[金属学及工艺—物理冶金]