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Optical Engineering

Shadow Moire Contouring Of Impact Craters
Author(s): D. R. Andrews
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Paper Abstract

The method of shadow moire topography has been used to characterize smooth craters formed on the surface of ductile metals. The craters were made by the impingement of hard spheres (diameter 5 X 10-3m) traveling at speeds of approximately 130 m s-1. A comparison of shadow moire with other methods, in particular the techniques based on holography, shows that the former is simpler to use, less costly, and relatively insensitive to vibrations. A mathematical description of a crater has been developed which describes the surface to a good approximation. It has only two independent parameters: the crater depth and the half-length, and can be integrated to give the volume of the crater. The parameters, which can be found directly from moire topographs, give a measure of the crater volume (10 to 0.1 X10-9 m3) accurate to within 8 to 15%. A more elaborate method for determining the volume, which is also described, optimizes the values of the parameters and has a final accuracy better than 3%.

Paper Details

Date Published: 1 August 1982
PDF: 5 pages
Opt. Eng. 21(4) doi: 10.1117/12.7972960
Published in: Optical Engineering Volume 21, Issue 4
Show Author Affiliations
D. R. Andrews, Cavendish Laboratory (United Kingdom)

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