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Proceedings Paper

Line-imaging Fabry-Perot interferometer
Author(s): Allen R. Mathews; Richard H. Warnes; Willard F. Hemsing; Gerald R. Whittemore
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Paper Abstract

A method for measuring the velocity history of a line element on a shock-loaded solid has been demonstrated. Light from a single-frequency laser is focused through a cylindrical lens to a line on a moving target. The return Doppler-shifted image is passed through a Fabry-Perot interferometer. Because only specific combinations of incident light angle and frequency can pass through the interferometer the output is an incomplete image of the moving target appearing as a set of fringes. This image is focused onto an electronic streak camera and swept in time. The fringe pattern changes with time as the target surface moves allowing determination of velocity for each point on the target that forms a fringe. Because the velocity can only be measured at the fringe positions it is necessary to use an interpolating polynomial to obtain a continuous function of time and velocity along the sampled line. 1.

Paper Details

Date Published: 1 January 1991
PDF: 11 pages
Proc. SPIE 1346, Ultrahigh- and High-Speed Photography, Videography, Photonics, and Velocimetry '90, (1 January 1991); doi: 10.1117/12.23341
Show Author Affiliations
Allen R. Mathews, Los Alamos National Lab. (United States)
Richard H. Warnes, Los Alamos National Lab. (United States)
Willard F. Hemsing, Los Alamos National Lab. (United States)
Gerald R. Whittemore, Los Alamos National Lab. (United States)


Published in SPIE Proceedings Vol. 1346:
Ultrahigh- and High-Speed Photography, Videography, Photonics, and Velocimetry '90
Paul A. Jaanimagi; Barry T. Neyer; Larry L. Shaw, Editor(s)

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