Electronic shearography for inspecting steel bridges: a feasibility study

Arup K. Maji; Debashis Satpathi; S. Zawaydeh

doi:10.1117/12.172596

1 March 1994 Electronic shearography for inspecting steel bridges: a feasibility study

Arup K. Maji, Debashis Satpathi, S. Zawaydeh

Proceedings Volume 2004, Interferometry VI: Applications; (1994) https://doi.org/10.1117/12.172596
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

Although a large number of nondestructive techniques based on laser interferometry have been developed over the last few decades, most of them are incapable of handling large structures. Shearography has shown potential as a full field nondestructive technique, capable of being used on large structures like bridges. The method however has been beset with the problem of poor fringe quality, and as any other interferometric technique, suffers from the problem of speckle de-correlation due to rigid body motions. This paper investigates the effect of rigid body motion on fringe visibility with an emphasis on applications in nondestructive testing of bridges. To this effect, a finite element and fracture mechanics analysis is carried out on a real bridge to identify the constraints on shearography in full scale structural testing.

Citation Download Citation

Arup K. Maji, Debashis Satpathi, and S. Zawaydeh "Electronic shearography for inspecting steel bridges: a feasibility study", Proc. SPIE 2004, Interferometry VI: Applications, (1 March 1994); https://doi.org/10.1117/12.172596

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