Accession Number:

AD0725159

Title:

Holographic Study of Wave Propagation in Granite

Descriptive Note:

Final rept. 4 Jun 1969-31 Dec 1970

Corporate Author:

TRW SYSTEMS GROUP REDONDO BEACH CA APPLIED MECHANICS LAB

Report Date:

1971-05-21

Pagination or Media Count:

133.0

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.

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Holography
  • Seismic Detection and Detectors
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE