WIDE ANGLE PERISCOPE SYSTEM DESIGN AND PROTOTYPE EVALUATION
OXFORD CORP BUFFALO NY
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A new concept for a wide angle periscope suitable for installation in the cockpit of an aircraft was investigated. The periscope was to have a horizontal view of 180 degrees with a or - 15 degrees vertical view and be capable of rapid closure. The system comprises a series of reflecting elliptical surfaces of revolution arranged about a vertical axis. The observer is located at the center of the lowest surface, and is essentially surrounded by a view of the outside scene having normal intensity. Design studies of the system were made with regard to scaling, surface precision, eye position sensitivity, distortion and focus. Fabrication techniques and materials were examined and two sets of surfaces manufactured to obtain further answers to questions raised or left unanswered by the analytical approach. The result of the design studies and prototype evaluations was to point out the extreme sensitivity to eye position for a system of this size and the need for optically precise surfaces which were unobtainable by the approach used.
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