Measurements of Surface Displacements During Stress Wave Propagation in Opaque Solids Using Pulsed Laser Speckle Photography
Tafralian, Michael Arthur
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https://hdl.handle.net/2142/68511
Description
Title
Measurements of Surface Displacements During Stress Wave Propagation in Opaque Solids Using Pulsed Laser Speckle Photography
Author(s)
Tafralian, Michael Arthur
Issue Date
1980
Department of Study
Theoretical and Applied Mechanics
Discipline
Theoretical and Applied Mechanics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Applied Mechanics
Language
eng
Abstract
An experimental method to measure in-plane surface displacements in opaque solids has been developed. The system consists of combining a pulsed ruby laser source and an optical speckle photography recording scheme. The set-up is capable of measuring surface displacements due to stress waves and propagating cracks in solids. A double exposure recording allows the comparison of object points to be made between two states of displacement. The final specklegram is processed and treated as a diffraction grating to yield both full-field or point-by-point data concerning object displacements. The advantages of such a system include variable sensitivity recordings, non-contacting, ultra fast and it fills the gap between other experimental methods such as moire and holography. Results using Homalite 100 and Lexan are presented.
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