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Proceedings Paper

Application Of Fabry-Perot Velocimeter To High-Speed Experiments
Author(s): H. H. Chau; C. F. McMillan; J. E. Osher
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Paper Abstract

The Fabry-Perot (F-P) velocimeter is a useful instrument for measuring the velocity of objects at speeds ranging from fractions of a kilometer per second to a few tens of kilometers per second and up. Because of its immunity to electromagnetic interference and its velocity resolution, it has become the prime diagnostic tool in our electric-gun facility. Examples of its application to high-speed experiments include the following areas: Electric-gun flyer studies; Spallation of materials under high-speed impact; Momentum-transfer studies; Pressure pulse created by high-velocity impact; Detonation-wave studies in high-explosive experiments. The F-P velocimeter at Lawrence Livermore National Laboratory (LLNL) includes a long-pulse laser amplifier, two-channel recording capability, air or fiber-optic transport of laser light, light enhancement through the F-P proper, and an electronic streaking camera with a microchannel-plate intensifier. Data reduction includes a digitizing system that employs a video camera and a personal computer for manipulating fringe curves and calculating velocities. Software corrects distortions from the streak camera used to generate the record. Our system yields a velocity measurement with an accuracy of 1 to 2%.

Paper Details

Date Published: 7 June 1989
PDF: 7 pages
Proc. SPIE 1032, 18th Intl Congress on High Speed Photography and Photonics, (7 June 1989); doi: 10.1117/12.969160
Show Author Affiliations
H. H. Chau, Lawrence Livermore National Laboratory (United States)
C. F. McMillan, Lawrence Livermore National Laboratory (United States)
J. E. Osher, Lawrence Livermore National Laboratory (United States)


Published in SPIE Proceedings Vol. 1032:
18th Intl Congress on High Speed Photography and Photonics
DaHeng Wang, Editor(s)

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