Damage identification using real time rotating field analysis

• Autor(a) principal: Lopes, Hernani
• Data de Publicação: 2013
• Outros Autores: Ribeiro, J.E., Santos, J.V. Araújo, Vaz, M.A.P., Gomes, J.F. Silva
• Idioma: eng
• Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Texto Completo: http://hdl.handle.net/10198/9833
• topic: Multi-damage localisation; Laminated plate; Rotation field; Multi-damage localisspeckle shearography

This paper proposes a real time damage identification method based on the perturbation analysis of the rotation field, which are measured using shearography technique. A particular case of phase modulation method is applied to the interference pattern in order to improve the spatial resolution of the rotation field. A program was developed in Matlab® platform for digital recording the information capture by CCD camera and post-processing the data using dedicated image techniques. The phase filter and unwrapping algorithms were optimized to allow the visualization at video rate the full-field rotations fields. For small internal damages in laminated composite plates, the results show a superior performance of the proposed technique in relation to the classical raw fringe analysis.