Intermediate image plane detection device and method for large-aperture reflection optical system

Abstract

The invention relates to an intermediate image plane detection device and method for a large-aperture reflection optical system. With the device and method adopted, technical problems such as imperfect imaging of the intermediate image plane of an existing large-aperture reflection optical system, a special combination state of the translation and tilt of the secondary mirror of the large-aperturereflection optical system and the monotonicity of detection field of views of the large-aperture reflection optical system during the installation and debugging process of the large-aperture reflection optical system can be solved. The device includes an interference auto-collimation plane mirror, an interferometer and a diffraction flat plate, wherein the interference auto-collimation plane mirror is arranged directly in front of the secondary mirror of a large-aperture reflection optical system to be measured, and the interferometer is arranged directly behind the primary mirror of the large-aperture reflection optical system to be measured, and the diffraction flat plate is arranged between an intermediate image plane and the secondary mirror, wherein the intermediate image plane is formed by the primary mirror and the secondary mirror of the large-aperture reflection optical system to be measured. The detection method includes the following steps that: 1) the diffraction flat plate is arranged in front of the intermediate image plane of the large-aperture reflection optical system to be measured; 2) the aberration coefficient of a mid-point field of view is measured; 3) the aberration coefficients of the remaining N-1 fields of view are measured; and 4) whether the location of the secondary mirror is assembled correctly is judged through the aberration coefficients of N fields of view.

Description

Technical field [0001] The invention relates to the technical field of optical system detection, in particular to an intermediate image plane detection device and method for a large-aperture reflective optical system. Background technique [0002] Multi-reflective camera systems with long focal length, large field of view, large aperture, and wide band are more and more widely used in civil aviation and aerospace fields. The large-aperture multi-reflection optical system is generally composed of a primary reflector, a secondary reflector and a third reflector. In order to achieve excellent imaging quality for large-aperture reflective optics, it is not only necessary to design the reflective optical system to eliminate aberrations in the full field of view, but also to adjust each mirror with high precision during the development process to ensure that the position errors of each mirror cause The aberration is within the tolerance requirement. [0003] In the assembly and adjustm...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problems such as the imperfect imaging of the middle image plane of the optical system, the special combination state of the translation and tilt of the secondary mirror, and the detection field of view being too single during the assembly and adjustment process of the existing large-aperture reflective optical system, the present invention provides a compensation system using diffractive optical elements. Intermediate image plane detection device and method of large-aperture reflective optical system

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