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

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Fernando Santos (Author) Other; Mário Vaz (Author) FEUP; Jaime Monteiro (Author) Other

Journal

Title: Optics and Lasers in Engineering

Vol. 42 No. 2

Pages: 131-140

ISSN: 0143-8166

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 44 Citations

Scopus - 56 Citations

Other information

Authenticus ID: P-000-9A0

DOI: 10.1016/j.optlaseng.2003.07.002

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10