Holographic Study of Wave Propagation in Granite
Abstract
Three techniques of holographic interferometry were developed to study the response of geological materials to propagating stress waves. Two of these techniques, stored-beam interferometry and double-exposure interferometry, were found effective when applied to studying small-amplitude wave propagation. The third technique, a form of time-average holographic interferometry, which produced fringes relating to velocities, was employed when studying higher stress levels (up to 30 kb). Low amplitude stress waves were generated by pendulum impacts; a gas gun was used to obtain higher stress levels. A complete description of each technique is given herein, together with a comparison of experimental results (using Westerly granite) and theoretical predictions.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 21, 1971
- Accession Number
- AD0725159
Entities
People
- Jerold J. Jacoby
- John D. O'keefe
- Robert Aprahamian
- Thomas J. Ahrens