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14 September 1977 A High-Intensity Point Light Source With Adjustable Light Duration
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Proceedings Volume 0097, 12th Intl Congress on High Speed Photography; (1977)
Event: 12th International Congress on High Speed Photography, 1976, Toronto, Canada
A high-intensity self-shuttered point light source of coaxial configuration with restrained capillary is described. The principle involved is the use of an artifical transmission line with ignitron crowbar. The current and with it the light pulse can be clipped within the range 10-150 μsec to prevent double exposure in rotating mirror cameras. The onset of the light pulse is less than 2.5 μsec. The effective undesired afterglow amounts to about 3 iusec. The photoemission is fairly constant to provide uniform exposure density on film. The light output amounts to 3.5 x 106 candelas for a source diameter of 1.5 mm. The size of the point light source is stable both in axial and radial direction and prevented from flickering by a plexiglas disc which terminates the plasma and the conical aperture. The light source has been applied successfully for taking pictures of a 18 cm dia field of view in shadow-graph and interferometer arrangements using a Cordin high-speed framing camera model 330 at a speed of 2.5 p.seciframe.
© (1977) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter Krehl "A High-Intensity Point Light Source With Adjustable Light Duration", Proc. SPIE 0097, 12th Intl Congress on High Speed Photography, (14 September 1977);


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