Dynamic holographic modal analysis for inspecting large civil engineering structures

David M. Rosenthal; James D. Trolinger

doi:10.1117/12.212657

23 June 1995 Dynamic holographic modal analysis for inspecting large civil engineering structures

David M. Rosenthal, James D. Trolinger

Proceedings Volume 2545, Interferometry VII: Applications; (1995) https://doi.org/10.1117/12.212657
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Cracks and defects in structures can be detected by observing the changes of the vibrational modal patterns and surface responses to stress. Features are made visible with dynamic holographic interferometry combined with parameter estimation. The procedure involves an unconventional, optimized, laser-illumination method. The methods are especially applicable to large structures and could prove pivotal to improved designs, monitoring, and maintenance. Components and structures could be designed to better withstand operating stresses, and existing structures could be analyzed to predict their response to stress. Since the modal characterization of a structure can act as a type of fingerprint, holographic interferometry can also be used to monitor structural degradation due to operating and aging. Modal characterization includes indentification of resonant frequencies and also the corresponding mode shapes. Holographic interferometry provides for direct modal characterization of a structure as well as measuring its small loading dynamic response. This research demonstrated that a wide variety of defects can be located in structural components, vessels, and pipes. An analytical exercise also demonstrates the ability to use global modal characteristics to determine the presence of local corrosion and erosion.

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David M. Rosenthal and James D. Trolinger "Dynamic holographic modal analysis for inspecting large civil engineering structures", Proc. SPIE 2545, Interferometry VII: Applications, (23 June 1995); https://doi.org/10.1117/12.212657

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KEYWORDS

Corrosion

Modal analysis

Holography

Civil engineering

Holograms

Holographic interferometry

Beam splitters

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