Method and device for measuring transverse magnification of optical system by means of uniform-speed moving point targets
A technology of lateral magnification and optical system, which is applied in the field of lateral magnification measurement and device of optical system using a uniform moving point target, can solve the problems of low repeatability of lateral magnification measurement, achieve small errors, reduce errors, and improve repetitive effect
Active Publication Date: 2012-08-01
HARBIN INST OF TECH
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A method and a device for measuring transverse magnification of an optical system by means of uniform-speed moving point targets belong to the field of metering equipment characterized by an optical method. The method includes: imaging point targets moving at a uniform speed to obtain a linear image; finding the value range of pixel spacing in a frequency domain; and calculating the transverse magnification of the optical system by means of genetic algorithm according to the fact that a practical modulation transfer function curve and a theoretic modulation transfer function curve related to the pixel spacing have the highest overlap ratio under the least square condition. In the device, sliders for bearing the point targets are mounted on a first guide rail and a second guide rail, a controller controls the sliders to move on the first guide rail at a uniform speed while controlling the sliders to move on the second guide rail, and movements in two directions are matched with each other, so that the point targets are constantly focused and imaged on the surface of an image sensor during movement. By the aid of the method and the device for measuring the transverse magnification of the optical system, errors of single measuring results can be decreased, and further repeatability of measuring results is improved.
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