Method for improving transfer function of large-visual-field reflective imaging optical system
A technology of imaging optics and large field of view, applied in the field of optics, can solve the problems of not fully utilizing the photoelectric conversion performance of imaging CCD devices, and achieve the effects of reducing size, support and cost
Inactive Publication Date: 2013-06-12
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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For a circular aperture stop, the diffraction spot on the image plane is circular, which cannot make full use of the photoelectric conversion performance of the imaging CCD device such as image 3 shown
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[0025] The inventive idea of the present invention is: the method for improving the communication of the large-field reflective imaging optical system of the present invention is applicable to the Cook TMA optical system, and can also be applied to other large-field reflective imaging, such as Rug TMA and coaxial TMA. In the conventional Cook TMA optical system design of the present invention, the circular aperture stop arranged on the secondary mirror is designed to be rectangular, then the aperture stop forms a rectangular entrance pupil through primary mirror imaging, and forms a rectangular exit pupil through three-mirror imaging. The rectangular entrance pupil area is larger than the entrance pupil area of a normal inscribed circle. The system transmission is proportional to the area of the entrance pupil, increasing the area increases the transmission. Moreover, the photosensitive surface structure of the detector CCD is a square or rectangular structure, which can...
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The invention relates to a method for improving a transfer function of a large-visual-field reflective imaging optical system. The method comprises the following steps of: setting an aperture diaphragm of the large-visual-field reflective imaging optical system into a matched shape according to a rectangular structure of a detector CCD (Charge Coupled Device), and enabling the diffraction spot of the aperture diaphragm to be matched with the image element size of an imaging receiving device CCD, therefore the transfer function of the large-visual-field reflective imaging optical system is improved. According to the method for improving the transfer function of the large-visual-field reflective imaging optical system, the transfer function can be improved by about 27 percent at the Nyquist frequency under the condition that main structures of Cook TMA (three-mirror anastigmatic) optical systems, such as the large-visual-field reflective imaging optical system, are the same.
Description
technical field [0001] The invention belongs to the field of optical technology, and in particular relates to a method for improving the communication of a reflection imaging optical system with a large field of view. Background technique [0002] The aperture diaphragm is set in the optical system to limit the size of the entrance pupil diameter. In the current conventional optical design, whether it is a coaxial optical system or an off-axis optical system, a circular aperture stop is used in the optical design. The entrance pupil is the image of the mirror group in front of the aperture stop system in the object space, that is to say, if the aperture stop is round, then the entrance pupil is round; if the aperture stop is square, then the entrance pupil is square , the shape of the aperture stop determines the shape of the entrance pupil of the entire optical system. The size of the entrance pupil determines the transmission and energy of the optical system. [0003] W...
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Inventor 张星祥任建岳
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI