A robust integration algorithm for out-of-plane displacement field measurements applied to multiple images of shearography

Estiven S. Barrera; Analucia V. Fantin; Daniel P. Willemann; Mauro E. Benedet; Armando Albertazzi Jr.

doi:10.1117/12.2526103

21 June 2019 A robust integration algorithm for out-of-plane displacement field measurements applied to multiple images of shearography

Estiven S. Barrera, Analucia V. Fantin, Daniel P. Willemann, Mauro E. Benedet, Armando Albertazzi Jr.

Author Affiliations +

Proceedings Volume 11056, Optical Measurement Systems for Industrial Inspection XI; 110560H (2019) https://doi.org/10.1117/12.2526103
Event: SPIE Optical Metrology, 2019, Munich, Germany

Abstract

Speckle shear interferometry, or shearography, has been more and more frequently used in the aerospace and oil and gas industry for in-field nondestructive inspections of flaws in composite materials. Nowadays new applications have emerged demanding the ability to operate in harsher environments, requiring more robust systems to meet this type of application. A recent modified shearography device allows multiple and simultaneous measurements with different shearing directions on a single grabbed image. This work proposes a robust integration algorithm by error minimization to obtain full-field displacement measurement. Simulated images are used to validate the effectiveness of the integration algorithm. Further, experiments are performed on a clamped circular plate with uniform loading. The proposed algorithm leads to a more accurate estimate of defect size measurement in composite materials.

Citation Download Citation

Estiven S. Barrera, Analucia V. Fantin, Daniel P. Willemann, Mauro E. Benedet, and Armando Albertazzi Jr. "A robust integration algorithm for out-of-plane displacement field measurements applied to multiple images of shearography", Proc. SPIE 11056, Optical Measurement Systems for Industrial Inspection XI, 110560H (21 June 2019); https://doi.org/10.1117/12.2526103

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