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Optical Engineering

Holographic Interferometry Applied To A Model Study Of Ground Vibrations Produced From Blasting
Author(s): Torgny E. Carlsson; Gert Bjarnholt; Nils Abramson; D. C. Holloway
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Paper Abstract

Dynamic double-exposure holographic interferometry and sandwich holography were applied to the measurement of surface displacements resulting from the detonation of an explosive charge on the surface of rock models. A 10 J state-of-the-art ruby laser was used to illuminate three different rock models that were 0.75 m on a side and 0.4 m deep. In one model, a simulated tunnel was made by coring the rock specimen in a subsurface plane that was parallel to the face of the block. Another model involved the transmission and alteration of surface waves as they encountered a step change in the surface elevation. The remaining specimen consisted of an epoxy wedge overlying the rock base. As the wave system passed into the epoxy layer of this last specimen, new waves were generated that produced dramatically increased displacements and particle velocities on the surface of the epoxy layer. These interferometric patterns were so complex that it was necessary to utilize sandwich holography to determine the wave types and the signs of the displacements.

Paper Details

Date Published: 1 November 1988
PDF: 5 pages
Opt. Eng. 27(11) 271123 doi: 10.1117/12.7976788
Published in: Optical Engineering Volume 27, Issue 11
Show Author Affiliations
Torgny E. Carlsson, Royal Institute of Technology (Sweden)
Gert Bjarnholt, Swedish Detonic Research Foundation (Sweden)
Nils Abramson, Royal Institute of Technology (Sweden)
D. C. Holloway, University of Maryland (United States)

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