Holographic Study of Wave Propagation in Granite
Final rept. 4 Jun 1969-31 Dec 1970
TRW SYSTEMS GROUP REDONDO BEACH CA APPLIED MECHANICS LAB
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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.
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