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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Fernando Santos (Autor) Outra; Mário Vaz (Autor) FEUP; Jaime Monteiro (Autor) Outra

Revista

Título: Optics and Lasers in Engineering

Vol. 42 Nº 2

Páginas: 131-140

ISSN: 0143-8166

Editora: Elsevier

Indexação

ISI Web of Knowledge - 44 Citações

Scopus - 56 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10