Damage identification using real time rotating field analysis

• Author(s): Lopes, H. ; Ribeiro, J.E. ; Santos, J.V.A. dos ; Vaz, M.A.P. ; Gomes, J.F.S.
• Date: 2013
• Persistent ID: http://hdl.handle.net/10198/9833
• Origin: Biblioteca Digital do IPB
• Subject(s): Multi-damage localisation; Laminated plate; Rotation field; Multi-damage localisspeckle shearography
• Document Type: Conference Object
• Language: English

Description

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.