INTERFEROMETRIC MEASUREMENT OF THE PARTICLE VELOCITY DISTRIBUTION IN THE MATERIAL UNDER SHOCK LOADING

N. Reinhand

Abstract

Laser differential interferometry is now widely used for the study of fast dynamic phenomena. The obtained interferograms provide the important data for the calculation of threshold strength in the materials under shock loading and allows to determine the beginning of their destruction. In the paper we analyse the procedure of the interferogram formation in such interferometer. The distribution of the particle velocities of the material under shock loading causes the quasi-monochromatic character of the interfering waves. In general case it occurred the result of interference of two quasi-monochromatic waves with different wavelengths and different bandwidths of spectral lines. We discuss the problems associated with the interference pattern contrast reduction that leads to the error in determination of the average velocity evolution. The results are illustrated by experimental data.

Keywords

velocity measurement, velocity dispersion, interferometry, interferogram contrast

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IMEKO-WC-2000-TC2-P051.pdf

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IMEKO TC

TC2 - Photonics

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