Pulsed Laser Stereophotography Of Miniature Exploding Foils

Dennis L. Paisley

doi:10.1117/12.955214

14 September 1977 Pulsed Laser Stereophotography Of Miniature Exploding Foils

Dennis L. Paisley

Proceedings Volume 0097, 12th Intl Congress on High Speed Photography; (1977) https://doi.org/10.1117/12.955214
Event: 12th International Congress on High Speed Photography, 1976, Toronto, Canada

Abstract

A pulsed-laser stereophotography system is used to evaluate the physical changes taking place in close (1 pm) proximity to the actinic plasma of miniature exploding foils. The system records stereopairs of photographs at 3 nsec exposures and 20X magnification. The image size is 50 mm square with resolution 40 lines/mm. The purpose of the laser is to supply a short (3 nsec) pulse of monochromatic light. This laser light reflected off the test specimen is then collected by the stereocamera. The 3-nsec pulse minimizes motion blur and the monochromaticity permits filtering out all wavelengths except that of the laser (694.3 nm) wavelength. This permits the self-light of the exploding foils to be, for all practical purposes, eliminated from the stereophotographs. The metal foils provide satisfactory reflection and the plasma acts as an optical absorber and provides for the necessary contrast. The camera includes 1.0-nm narrow band pass filters to prevent recording the exploding foil self-light. The stereopairs are read on a stereo-comparagraph normally used for aerial photographs that has been calibrated for reading these stereophotographs. Since these exploding foils have typical function times of 500 nsec, the stereophotographs are synchronized in time with the event under test. Stereophotographs can be recorded at any preselected time to within ± 20 nsec. This technique provides a means to closely evaluate events near optically intense plasma.

Citation Download Citation

Dennis L. Paisley "Pulsed Laser Stereophotography Of Miniature Exploding Foils", Proc. SPIE 0097, 12th Intl Congress on High Speed Photography, (14 September 1977); https://doi.org/10.1117/12.955214

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