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Off-axis three-mirror prepositive optic system

A pre-optical system and three-mirror technology, applied in the optical field, can solve the problems of difficult installation and adjustment, difficult processing and high cost, and achieve the effects of easy installation and adjustment, low manufacturing cost and simple structure

Active Publication Date: 2016-04-06
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, three aspheric mirrors are generally used in this type of system, which is difficult and costly to process, and is not easy to install and adjust.

Method used

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  • Off-axis three-mirror prepositive optic system
  • Off-axis three-mirror prepositive optic system
  • Off-axis three-mirror prepositive optic system

Examples

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Embodiment 1

[0019] For the structure of the reflective front optical system provided in this embodiment, please refer to the attached figure 1 , from the object side to the image side, the main mirror 1, the secondary mirror 2 and the third mirror 3, 4 are the image planes. Among them: primary mirror 1 is an aspheric concave mirror with a radius of curvature of 148.59 mm, a conic coefficient of -1.528, and a diameter of 35.9 mm; secondary mirror 2 is a convex spherical mirror with a radius of curvature of 41.69 mm and a diameter of 4.3mm; the third mirror 3 is a concave spherical mirror with a radius of curvature of 56.49mm and a diameter of 16.6mm.

[0020] The working band of the optical system is 0.4-1.05um, the F / # is 3.36, the focal length is 83.6mm, and the field of view is ±5.5°. The specific design parameters are shown in Table 1.

[0021] Table 1 Optical system design parameter table

[0022] Component name radius of curvature interval Y axis eccentric X-axis ...

Embodiment 2

[0029] See attached Figure 4 , which is a structural schematic diagram of a reflective front-end optical system for a spectral imager provided in this embodiment. From the object side to the image side, the main mirror 1, the secondary mirror 2 and the third mirror 3, 4 are the image planes, and a turning plane mirror 5 is set between the third mirror 3 and the image plane 4 to turn the imaging optical path, which can facilitate the mechanical structure design and installation of detectors. In this embodiment, the primary mirror 1 is an aspheric concave mirror with a radius of curvature of 147.91 mm, a conic coefficient of -1.525, and a diameter of 36.1 mm; the secondary mirror 2 is a convex spherical mirror with a radius of curvature of 42.39 mm. mm, with a caliber of 4.5mm; the third mirror 3 is a concave spherical mirror with a radius of curvature of 56.61mm and a caliber of 16.7mm.

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Abstract

The invention discloses an off-axis three-mirror prepositive optic system, which is a reflective prepositive optic system applied to a spectral imager. The structure of the system is as follows: in an incident light direction, light is reflected via a main mirror and then forms a convergent beam, the convergent beam is incident to a secondary mirror, the convergent beam is then reflected via the secondary mirror and is then incident to a three-mirror, and the three-mirror converges the beam for imaging; the main mirror is an aspheric concave mirror with a curvature radius of 147.59 to 149.59 mm and a secondary curve coefficient of -1.52 to -1.53; the secondary mirror is a convex spherical mirror with a curvature radius of 41.6 to 42.6 mm; and the three-mirror is a concave spherical mirror with a curvature radius of 56.4 to 56.7 mm. The system of the invention has the advantages that the structure is simple, the making difficulty and the making cost are low, assembling and adjustment are easy and the like.

Description

technical field [0001] The invention relates to a reflective front optical system for a spectral imager, in particular to an off-axis three-mirror front optical system in which only the main mirror is aspherical, and belongs to the field of optical technology. Background technique [0002] The spectral imager can acquire the spatial and spectral information of the target at the same time. It is an optical imaging instrument that "integrates the image and spectrum" and has a wide range of applications in aerospace remote sensing, military reconnaissance, agriculture, and environmental monitoring. A typical spectral imager consists of three parts: a pre-optical system, a spectroscopic imaging system, and a detector. The front optical system is used to image the target scene to the incident slit of the spectroscopic imaging system, and its performance directly affects the main technical indicators of the spectroscopic imager. [0003] With the further development of imaging te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B17/06
CPCG02B17/0642
Inventor 陈新华韩琳沈为民
Owner SUZHOU UNIV
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