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Long-focus optical system for star tracker

An optical system and star tracker technology, applied in optics, optical components, instruments, etc., can solve the problems of central occlusion, severe secondary spectrum, long system tube, etc., achieve simple and compact structure, improve detection accuracy, and apply The effect of wideband

Inactive Publication Date: 2014-07-02
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, the system is required to have wide operating band and long focal length performance at the same time, which will lead to serious chromatic aberration and secondary spectrum respectively.
If a pure reflective system is used, although it has the advantage of no chromatic aberration, there is a central occlusion, which will lose luminous flux, and, in the case of a long focal length, it is difficult to miniaturize
The refractive optical system is relatively easy to meet the requirements of high imaging quality, but there are still long focal lengths, the length of the system tube is long, and the secondary spectrum is serious

Method used

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  • Long-focus optical system for star tracker
  • Long-focus optical system for star tracker
  • Long-focus optical system for star tracker

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Embodiment 1

[0024] The technical solution of this embodiment is to provide a long focal length miniature star tracker optical system for star trackers, its working band is 0.6m ~ 1.1m, the system F number is F / #=12.0, and the full field of view 0.5 degrees.

[0025] See attached figure 2 , which is the imaging optical path diagram of the long-focus miniature star tracker optical system used in daytime star measurement provided by this embodiment; It is a meniscus spherical negative lens 1, an aspheric primary reflector 2, an aspheric secondary reflector 3, an all-lens compensation group 4, and the image plane 5 of the star tracker optical system is located on the photosensitive surface of the focal plane detector.

[0026] Depend on figure 2 It can be seen that the system diaphragm is located on the secondary reflector, and the optical power of the system is basically borne by two reflectors. The meniscus spherical negative lens 1 can be used to compensate the spherical aberration and...

Embodiment 2

[0035] In this embodiment, the F number is F / No.=12, and the working band is short-wave infrared (0.6m~1.1m) with a full field of view of 0.5 degrees. For the optical system structure and imaging optical path, please refer to the attached figure 2 , its all-lens compensation group as attached image 3 .

[0036] The remaining parameters of the optical system are as follows: the focal length is 1001 mm, along the incident direction of the light, the radii of curvature of the front and rear surfaces of the meniscus spherical negative lens 1 are 122.15 mm and 118.01 mm respectively, the thickness is 5.80 mm mm, and the refractive index is 1.42; the aspheric main reflection The radius of curvature of the mirror 2 is -173.54mm, and the aspheric coefficients of the fourth power e and the sixth power e are 2.45E-8 and 4.12E-13 respectively; the curvature radius of the aspheric secondary reflector 3 is -35.75mm , the aspherical coefficient fourth power e and sixth power e are 7.46E-...

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Abstract

The invention relates to a long-focus optical system for a star tracker. The long-focus optical system is composed of a Maksutov-Cassegrain system and an all-lens compensation set and comprises a meniscus lens, a primary reflection mirror, a secondary reflection mirror and three small lenses. In order to reduce the chromatic aberration and the secondary spectrum of a long-focus system, the focal power of the system is mainly borne by the reflection mirrors, and the compensation set formed by the three small lenses bears small focal power, and reasonable glass materials are selected to compensate the chromatic aberration of the meniscus lens. By means of a coaxial structure, the long-focus optical system is simple in structure, easy to install and debug and good in stability; by means of a refraction-reflection type optical structure, the long-focus optical system is simple and compact in structure, wide in application wave band, small in the chromatic aberration, the secondary spectrum and distortion, high in telecentric degrees and good in imaging quality; compared with pure reflection type systems, the long-focus optical system for the star tracker is simple in structure, short in system length, good in stability and convenient to carry; and compared with pure refraction type systems, the long-focus optical system is compact in structure, small in the chromatic aberration and the secondary spectrum and good in imaging performance.

Description

technical field [0001] The present invention relates to a long-focus star tracker optical system for daytime star measurement, in particular to a long-focus, small-field-of-view, and large-aperture star tracker optical system that adopts a coaxial catadioptric structure and works in the visible and near-infrared bands. system. Background technique [0002] Star tracker is a kind of star camera, which is a kind of astronomical navigation equipment that can provide position information and attitude information for aviation control system, and is an important part to ensure the normal flight of aircraft and spacecraft. With the development of aviation technology, the requirements for aircraft navigation accuracy are getting higher and higher, and the star tracker is developing towards the direction of long focal length and miniaturization requirements. [0003] See attached figure 1 , The star tracker generally includes an optical imaging system, a detector, a mechanical move...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/22G02B13/06G02B17/08G01C1/00
Inventor 季轶群贺虎成石荣宝徐莉
Owner SUZHOU UNIV