A new set-up for pulsed digital shearography applied to defect detection in composite structures

被引：44
|
作者：
Santos, F
Vaz, M
Monteiro, J
机构：
[1] Univ Porto, Fac Engn, DEMEGI, SMAP, P-4200465 Oporto, Portugal
[2] NDT Expert, Toulouse, France
[3] DEMEGI SMAP, Inst Engn Mecan & Gestao Ind, P-4200465 Oporto, Portugal
来源：
OPTICS AND LASERS IN ENGINEERING | 2004年 / 42卷 / 02期
关键词：
ruby laser; Mach-Zehnder; interferometry; pulsed digital shearography; FFT;
D O I：
10.1016/j.optlaseng.2003.07.002
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
An optical set-Lip based on the combination of new CCD technology, a ruby laser and a Mach-Zehnder shear interferometer is presented for defect detection in composites. Transient loads are used to excite defects in a sandwich structure and image-processing routines allow improving the detection resolution. Phase calculation is obtained by FFT algorithms applied to interference patterns with a spatial carrier in the primary fringes. Independent control of the shear and the frequency of the spatial carrier can be obtained with this set-up. The experimental implementation of the set-tip and the results obtained with it are presented and discussed. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：131 / 140
页数：10
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