Color Schlieren and triple-flash photography with a three-color source using dichroic filters

Michael W. Seitz; Beric W. Skews

doi:10.1117/12.209576

30 May 1995 Color Schlieren and triple-flash photography with a three-color source using dichroic filters

Michael W. Seitz, Beric W. Skews

Proceedings Volume 2513, 21st International Congress on: High-Speed Photography and Photonics; (1995) https://doi.org/10.1117/12.209576
Event: High-Speed Photography and Photonics: 21st International Congress, 1994, Taejon, Korea, Republic of

Abstract

A versatile light source producing three independent flashes in each of the three primary colors has been developed. The system uses an arrangement of Xenon flash tubes and dichroic filters, with the optical axis of the three emerging beams being coincident. This feature enables the three independently triggered beams to be used in a monochromatic schlieren system with a single common knife-edge and film plane. The usefulness of measurements taken from the composite image in the study of shock wave dynamics is illustrated. The three separate monochromatic images may be recovered by digital color separation, so that the evolution of the wave system may be studied.With minor adjustment of the alignment,the three effective sources can be arranged at 120 degrees to each other, so that when flashed simultaneously, and used with a suitable cut-off, the system may be converted for full 2D color schlieren photography. In this application the colors on the image give information on the density gradient directions in the flow field. This system is very much more light efficient than color schlieren methods using a diffusing screen as none of the source light is scattered.

Citation Download Citation

Michael W. Seitz and Beric W. Skews "Color Schlieren and triple-flash photography with a three-color source using dichroic filters", Proc. SPIE 2513, 21st International Congress on: High-Speed Photography and Photonics, (30 May 1995); https://doi.org/10.1117/12.209576

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