A Rotating-Mirror Framing Camera with Multiple Focal-Plane Shutters
In the preceding paper by Jacobs, a new family of rotating-mirror framing cameras has been discussed. This paper describes a camera in this family in which a number of concave mirrors are used with a single rotating mirror to create a connected sequence of images which pass several slits that act as focal-plane shutters. The images seen through the slits are relayed to form separate rows of frames by means of a smear-camera arrangement. By combining 36 concave mirrors with six properly phased slits, a total of 216 frames can be recorded in approximately 1/8 revolution of a rotating mirror. The camera now being constructed at the Naval Ordnance Laboratory will use two mirrored faces, 6 by 2 in., of a rectangular rotating mirror. At the anticipated rotor speed of 600 rps approximately 106 frames/sec will be attained. Each frame will be about 0.75 in. high and 1.0 in. wide. It will be possible to vary the shutter-to-framing-time ratio from about 0.5 to about 0.02 by varying the width of the slits used in the camera. The effective aperture will remain fixed at about f/22.
- Print ISSN
- 0361-4573
- Published
- 1960-11
- Content type
- Original Research
- DOI
- 10.5594/J15551