A New Development Of The Method Of Calculating The Approximating Circle In Rotating Mirror Framing Camera

Abstract

This paper deduces a formula which calculates two approximating circles simultaneously. With the help of computer and optimum technology, we calculate two approximating circles parameters under the condition of restricting the angle between optical axle of relay lens and reflecting optical axle of rotating mirror, the evenness of photographic frequency and the evenness of magnifying power of relay lens to certain limits. Rotating mirror high-speed cameras have many advantages such as high efficiency, high resolution and convenient for using. Thus the cameras are used in most of high speed process laboratories. In designing this camera, some calculation methods need to be improved. According to the effect of factors on image quality, this paper obsorbs the advantages of a few methods of selecting approximating circle parameters of framing camera and seeks more reasonable ways to determine approximating circle parameters of framing camera. It makes optical axle of relay lens consistant with reflecting optical axle of rotating mirror in working angle, and also makes the out-of-focus between approximating circle and practical image plane as small as possible. Thinking above two aspects and considering the evenness of photographic frequency and the evenness of magnification of relay lens, this paper deduces the relations between relay lens approximating circle and focal plane approximating circle by using relay lens imagery. By using the method of determining two approximating circles simultaneously, it increases image quality of image point in axle and off axle.