Line-imaging Fabry-Perot interferometer

Allen R. Mathews; Richard H. Warnes; Willard F. Hemsing; Gerald R. Whittemore

doi:10.1117/12.23341

1 January 1991 Line-imaging Fabry-Perot interferometer

Allen R. Mathews, Richard H. Warnes, Willard F. Hemsing, Gerald R. Whittemore

Proceedings Volume 1346, Ultrahigh- and High-Speed Photography, Videography, Photonics, and Velocimetry '90; (1991) https://doi.org/10.1117/12.23341
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

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.

Citation Download Citation

Allen R. Mathews, Richard H. Warnes, Willard F. Hemsing, and Gerald R. Whittemore "Line-imaging Fabry-Perot interferometer", Proc. SPIE 1346, Ultrahigh- and High-Speed Photography, Videography, Photonics, and Velocimetry '90, (1 January 1991); https://doi.org/10.1117/12.23341

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