Paper I–1: A Modern Reflection Shadowgraph System for Use in High-Velocity Aeroballistic Ranges

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPTE
Volume: 71, No. 1A, pp. 369–371
Abstract: A new-type precision shadowgraph system has been developed for use in the 1000-ft Hyperballistics Range of the Naval Ordnance Laboratory. The most important feature of the new system is its unusually high efficiency in the use of the light emitted by a spark source in making a photographic exposure. This is an important advantage in illuminating systems for use in photographing high-speed phenomena mainly because it permits the making of satisfactory latent images on the photographic material with the use of light sources which are relatively much weaker than would otherwise be required. This advantage is especially valuable in the present system, since the timing of the shadowgraph depends entirely upon the time duration of the spark light source, and since the desired exposure time, of the order of 10-7 sec, is more easily obtained the lower the light output requirement. The component of the system responsible for its high efficiency is a 48-in. diameter polished aluminum spherical reflector of 94-in. spherical radius, mounted in relation to the spark and the camera lens in such a way as to form an image of the spark within the aperture of the lens. The camera is focused on the reflector surface, and thus forms a sharp image of the shadow cast by any ballistic phenomenon which is located between the spark and the reflector at the time the spark is fired. The present paper describes the complete system as it has developed to meet certain design requirements, as well as some of the other possible choices of component parts which were investigated during the development.
Publication Date: 1962-01-01
DOI: 10.5594/J18146XY
ISSN: Print: 0361-4573
Link: https://doi.org/10.5594/J18146XY
Author(s): Paul H. Cords
Paul A. Thurston
William R. Noyes
Copyright: © 1962 Society of Motion Picture and Television Engineers, Inc.

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Paul H. Cords, Paul A. Thurston, and William R. Noyes; Paper I–1: A Modern Reflection Shadowgraph System for Use in High-Velocity Aeroballistic Ranges, Journal of the SMPTE ( Volume: 71, Issue: 1A, 1962); SMPTE, 1962. Available at https://doi.org/10.5594/J18146XY

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Paul H. Cords, Paul A. Thurston, and William R. Noyes; Paper I–1: A Modern Reflection Shadowgraph System for Use in High-Velocity Aeroballistic Ranges, Journal of the SMPTE ( Volume: 71, Issue: 1A, 1962); SMPTE, 1962. Available at https://doi.org/10.5594/J18146XY

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<span class="citation">Paul H. Cords, Paul A. Thurston, and William R. Noyes; <cite>Paper I–1: A Modern Reflection Shadowgraph System for Use in High-Velocity Aeroballistic Ranges</cite>, Journal of the SMPTE ( Volume: 71, Issue: 1A, 1962); SMPTE, 1962. Available at <a href="https://doi.org/10.5594/J18146XY" target="_blank" rel="noopener">https://doi.org/10.5594/J18146XY</a></span>

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<li>
Paul H. Cords, Paul A. Thurston, and William R. Noyes; <cite id="bib-10-5594-j18146xy">Paper I–1: A Modern Reflection Shadowgraph System for Use in High-Velocity Aeroballistic Ranges</cite>, Journal of the SMPTE ( Volume: 71, Issue: 1A, 1962); SMPTE, 1962
<span class="doi">10.5594/J18146XY</span>
</li>