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A High-Speed Rotating-Mirror Frame Camera
By BERLYN BRIXNER
A high-speed framing camera of some general utility has been developed at the Los Alamos Scientific laboratory and operated up to 3,500,000 frames/sec. Use is made of a rotating mirror and 170 framing lenses working at f/26 to produce frame pictures 1.2 X 1.4 cm in size. Another model operating at 100,000 frames/sec has been made with 90 circular frames 2 cm in size.
JL HE CONTINUOUS-WRITING high-speed frame camera herein described was made for the detailed study of explosive phenomena and is primarily useful for the photography of high-speed events that are self-luminous or illuminated by very intense explosive light sources using an argon atmosphere.1 Frame cameras operating up to 500,000 frames/ sec have been made,2*3 but the systems used probably cannot he increased in speed to any great extent because of the limitations of the strength of the rotating mirrors used. The camera to be described was designed for operation up to 3,400,000 frames/sec and makes use of a small mirror so that much higher rotational speeds can be obtained.
Optical System
The principle of operation of the camera is the same as has been used in
Presented on October 9, 1952, at the Society's Convention at Washington, D.C., by W. E. Buck for the author, Berlyn Brixner, University of California Los Alamos Scientific Laboratory, P.O. Box 1663, Los Alamos, N.M.
highest-speed cameras previously made in that an object to be photographed is imaged on the surface of a rotating mirror and then relayed to successive positions on the film by a series of relay lenses. The novel feature of this camera is the use of a small, thin, two-faced rotating mirror and the division of the optical system into two sections so that appreciable blind time is avoided.
Figure 1 shows a schematic isometric view of the optical system. The objective lens LI forms an image Ii in the field lens L2. The beam-splitting mirror MI divides the light from Ii into two paths A and B. Consider path A first. The combined relay and field lens L3A relays the first image Ii to the position I2A near the surface of the rotating mirror RM, using the mirrors MZA and M3A to properly direct the light path. The mirror M3A is so placed that the rays forming the image I2A are reflected from the surface of the rotating mirror RM into the final relay lens L4A to form the image ISA in the film plane FA. A series of lenses identical to L4A are placed in the 1 80° arc shown to form
December 1952 Journal of the SMPTE Vol. 59
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