HIGH-SPEED TIME AVERAGE DIGITAL HOLOGRAPHY FOR NDT OF CURVED SANDWICH STRUCTURES
HIGH-SPEED TIME AVERAGE DIGITAL HOLOGRAPHY FOR NDT OF CURVED SANDWICH STRUCTURES
复制标题
弯曲夹层结构无损检测的高速时均数字全息技术
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Binu P. Thomas
中科院分区：
文献类型：
--
作者：
Binu P. Thomas
在夹层结构的急剧弯曲的边缘脱粘检测发现很难使用传统的无损检测（NDT）技术。本文利用数字全息术和时间平均全息干涉术的优点，提出了一种检测弯曲夹层结构脱粘的新方法。为高速记录、生成和存储时间平均数字全息图而开发的软件在每帧几分之一秒内就可以捕获频率扫描期间每1 Hz频率增量的模式形状。因此，脱粘区域的局部共振容易且快速地可视化，并且没有机会错过任何这样的签名和因此的缺陷。本文介绍了该方法的基本原理、步骤、软件细节和结果。
Detection of debonds at sharply curved edges on sandwich structures is found difficult using conventional nondestructive testing (NDT) techniques. The advantages of digital holography and time average holographic interferometry were utilized to evolve a new approach to detect debonds on curved sandwich structures which is reported in this paper. Software developed for the high-speed recording, generation and storage of time average digital holograms within a fraction of a second per frame, made possible the capture of mode shape for every 1 Hz frequency increment during the frequency sweep. Thus the local resonance of debond region is easily and quickly visualized with zero chance of missing any such signatures and thus defects. The basic theory, procedure, software details and results are reported in this paper.