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Optical Engineering

Three-color common-axis light source suitable for shock wave studies
Author(s): Michael W. Seitz; Peter A. Seitz; Beric W. Skews
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Paper Abstract

A single-axis, three-color light source system with independent triggers, suitable for multiflash schlieren and other photography is developed. The system enables three primary color exposures to be taken on a common film plane, with each exposure, when separated into the primary color components, representing a monochromatic photograph that can be converted to a gray-scale image. The three primary color light sources on a common optical axis are achieved using a specially designed beamsplitter consisting of dichroic filters mounted against a penta-prism shaped holder. Using this penta arrangement and three independent white light flash sources (e.g., xenon lamps), three images can be recorded at independent times on a single image plane. For schlieren applications, this arrangement ensures that all three images have equal sensitivity because they pass through a common schlieren cutoff, and also have the same axis angle (or perspective) relative to the test section. The system has proven to be both low cost and versatile.

Paper Details

Date Published: 1 September 1994
PDF: 4 pages
Opt. Eng. 33(9) doi: 10.1117/12.175673
Published in: Optical Engineering Volume 33, Issue 9
Show Author Affiliations
Michael W. Seitz, Univ. of the Witwatersrand (South Africa)
Peter A. Seitz, Univ. of the Witwaterstrand (South Africa)
Beric W. Skews, Univ. Witwatersrand (South Africa)


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