一种新型脉冲涡流提离交汇点的实验研究  

Experimental Investigation on A New Lift-off Intersection Point of Pulsed Eddy Current testing

作　　者：齐勇[1,2] 李勇[1] 陈振茂[1] 肖美华[1] 

机构地区：[1]西安交通大学机械结构强度与振动国家重点实验室 [2]94354部队

出　　处：《空军工程大学学报（自然科学版）》2012年第6期80-84,共5页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51007069);中央高校基本科研业务费专项资金资助项目(08142005)

摘　　要：由于多层金属结构由于服役环境较为恶劣,其结构的亚表面层材质电气性能会出现劣化,直接威胁到大型、复杂装备的安全运转。本文提出一种新型提离交汇点,即脉冲涡流差分信号提离交汇点,并基于该交汇点,提出一种对多层结构亚表面层材质劣化进行检测和评估的新方法。通过理论及实验研究,对本文所提出的新型提离交汇点特性及其对多层结构亚表面层材质劣化评估的灵敏度进行了集中探究。研究发现,与传统磁场信号提离交汇点相比,差分信号提离交汇点对金属部件亚表面层材质劣化灵敏度较大,体现了脉冲涡流差分信号提离交汇点在金属部件亚表面层材质劣化定量评估中的优势。Because of the rigorous working environment, Subsurface Material Degradation （SMD） occurs in the stratified metallic structures which are extensively employed in industries such as aerospace and energy fields. This directly influences the angle operation of crucial components in the large-scale complex appara- tus. This paper investigates a new Lift-off Intersection Point （LOI） via theoretical study of Pulsed Eddy Current Testing （PECT）. Following the analysis of the forward problem of the new LOI, a method for e- valuation of SMD in stratified metallic structures is proposed. Through experiments the proposed method displays some advantages. By using it the sensitivity of PECT based on the new LOI to subsurface material degradation is higher than that of the traditional-LOI based PECT, which benefits the quantitative evalua- tion of subsurface material degradation occurred within the practical stratified metallic structures.

关 键 词：亚表面材质劣化 电磁无损检测 脉冲涡流检测 新型提离交汇点 磁场测量 

分 类 号：TG115[金属学及工艺—物理冶金]