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Improved Offner optical system for detecting ultra-large-aperture concave aspheric mirror

An Ofner, ultra-large aperture technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of large compensator aperture and difficult to obtain materials, and achieve excellent image quality, easy parts processing, and high inspection accuracy. Effect

Pending Publication Date: 2020-02-11
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The aperture ratio of the compensator to the mirror to be inspected is 0.042 during the inspection of the main mirror of the MMT telescope. When inspecting a 14m-aperture aspheric mirror, a 588mm-aperture compensating mirror is required, and the compensator has a large aperture and it is difficult to obtain materials.

Method used

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  • Improved Offner optical system for detecting ultra-large-aperture concave aspheric mirror
  • Improved Offner optical system for detecting ultra-large-aperture concave aspheric mirror

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Embodiment Construction

[0019] The present invention proposes an improved Offner inspection optical system for super-large-diameter concave aspheric mirrors, and the main technical indicators are as follows:

[0020] 1. Aperture ratio of the first compensator to the concave aspheric mirror to be inspected: 0.025;

[0021] 2. The ratio of the total incident ray aperture angle to the exit ray aperture angle of the compensation lens β=-1.71, and the ratio β of the incident ray aperture angle to the exit ray aperture angle of the first compensation lens 1 =-2.16, the ratio β of the incident ray aperture angle to the exit ray aperture angle of the second compensation lens 2 =0.79;

[0022] 3. The test aspheric surface diameter is 13.98m, the radius of curvature is 40m, and the relative aperture is 1 / 1.43;

[0023] 4. Check that the optical wave aberration PV value is better than 0.1λ (λ=633nm), and the RMS wave aberration is better than 0.025λ (λ=633nm).

[0024] The design parameters of the optical sy...

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Abstract

The invention discloses an improved Offner optical system for detecting an ultra-large-aperture concave aspheric mirror. Light emitted by a detection device is transmitted through a first compensationlens and a second compensation lens to a to-be-detected concave aspheric mirror, self alignment is performed, and then the processed light returns. The optical system selects a large incident light aperture angle and a first compensation lens bears a large aspheric normal aberration, thereby greatly improving the compensation capability; and the aspheric spherical aberration balance is realized under the condition of a small aperture ratio. The ratio of the caliber of the compensator to the caliber of the detected aspheric surface is very small and is only 0.025. With a two-piece compensatorstructure, the number of compensating lenses is small; on the basis of a full spherical design, the design limitation that a compensating system is aspheric for checking a large-caliber aspheric surface is broken through; the scheme is simple and the machining period is shorter; the image quality of an inspection light path is excellent; the wave aberration reaches a PV value superior to 0.1 lambda; and the improved Offner optical system is suitable for high-precision aspheric surface shape machining. Because of the improved Offner testing, the aspheric mirror testing of 14-m ultra-large aperture and ultra-large relative aperture of 1 to 1.43 can be realized.

Description

technical field [0001] The invention relates to the inspection of a concave aspheric mirror with a super large diameter and a super large relative aperture, in particular to an improved Offner optical system for inspecting an aspheric mirror based on zero compensation. The optical system is suitable for testing concave aspheric mirrors with a radius of curvature of at least 40m and a diameter of 13.98m, and the relative aperture reaches 1 / 1.43; the light passes through the concave aspheric mirror to be inspected once. Background technique [0002] Large-aperture optical systems have been more and more widely used in the fields of astronomical optics, space optics, and ground-based space target detection and recognition. Aspheric surface is a key technology in large-aperture optical system. The reason is that large-aperture aspheric surface has excellent characteristics such as expanding field of view, reducing system complexity, improving spatial resolution and increasing si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01B11/255
CPCG01B11/24G01B11/255
Inventor 王欣刘强周浩何志平舒嵘贾建军
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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