Large-visual-field off-axis prime focus type collimator optical system

Abstract

A large-visual-field off-axis prime focus type collimator optical system (a collimator with a dark focal power rectifying mirror group arranged in front of an off-axis paraboloid focus in an offset mode) is characterized in that the dark focal power rectifying mirror group is arranged in front of the off-axis paraboloid focus, the dark focal power rectifying mirror group has eccentricity and tilt relative to a main paraboloid of an off-axis paraboloid, the eccentricity amount is less than + / - 30mm, the gradient is less than + / - 1 degree, a system focal plane is perpendicular to an optical axis of the dark focal power rectifying mirror group, and the dark focal power rectifying mirror group is composed of three single lenses made of the same materials. The invention further provides a method for calculating an initial structure of the dark focal power rectifying mirror group, wherein the method comprises a key method for solving relationships of parameters between an auxiliary axis and a main axis and conversion of the relationships. The advantage of a single off-axis paraboloid mirror, namely non central shielding, is retained, aberration of an out-axis visual field is rectified within broadband under the premise that the structure is simple, and the cost of the collimator is reduced by utilizing the characteristic that the small-caliber transmission optical element processing is relatively easy.

Description

technical field [0001] The invention belongs to the field of optical-mechanical-electrical integration equipment, and in particular relates to a collimator optical system with a large field of view off-axis main focus )the design of. Background technique [0002] Collimator is an optical measuring instrument, mainly used for photoelectric detection, optical system calibration, etc. It can provide a beam of parallel light, simulating an infinite target. On the focal plane of the collimator objective lens, reticle, star point plate, Poirot plate, identification plate and other focal plane optical elements can be placed to detect and calibrate various parameters and performances of the measured optical system. Equipped with a micrometer eyepiece or microscope system, it can measure the focal length, discrimination rate, and imaging quality of the lens and lens group, and can also perform various optical measurements such as interference detection. Place the plane reflector o...

AI Technical Summary

Problems solved by technology

[0011] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a large field of view off-axis main focus type collimator optical system (a collimator with an agnostic correction lens group offset in front of the focal point of the off-axis parabola ), which is a new type of collimator structure and its design method. The present invention can overcome the disadvantages of the prior art, such as small effective field of view, difficult installation and adjustment, unstable structure or high cost in a vacuum environment, and so on. The afocal correction lens group can correct other aberrations without introducing chromatic aberration, and correct other aberrations in the off-axis parabola off-axis field of view to expand the effective field of view of a single off-axis parabola structure

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