Athermalization star sensor optical system with stable focal length

A technology of optical system and star sensor, which is applied in optics, optical components, instruments, etc., can solve the problem of not considering the sensitivity of temperature and focal length, etc., and achieve the effect of light weight, reduced sensitivity, and low distortion

Active Publication Date: 2020-01-17
CHANGGUANG SATELLITE TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing star sensor optical system does not consider the sensitivity of the temperature to the focal length while realizing the athermalization design, and then provides an athermalized star sensor optical system with a stable focal length. system

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  • Athermalization star sensor optical system with stable focal length
  • Athermalization star sensor optical system with stable focal length
  • Athermalization star sensor optical system with stable focal length

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specific Embodiment approach 1

[0033] Specific implementation mode one: combine Figure 1~5 Describe this embodiment mode, an athermalized star sensor optical system with stable focal length, which includes a mechanical structure, a lens group, an aperture stop 1 and an image plane 2, and the lens group includes first to sixth lenses, wherein the The refractive powers of the first lens 3, the second lens 4, the fourth lens 6 and the fifth lens 7 are all positive, the refractive powers of the third lens 5 and the sixth lens 8 are negative, and the aperture stop 1. It is located between the third lens 5 and the fourth lens 6. The first to sixth lenses 8 and the image plane 2 are arranged in sequence along the light incident direction and the optical axis. The material of the first lens 3 is SILICA, and the first lens 3 is made of SILICA. The material of the second lens 4 is D-LAF50, the material of the third lens 5 is H-ZF7LA, the material of the fourth lens 6 is D-ZPK1A, and the material of the fifth lens 7 ...

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Abstract

The invention discloses an athermalization star sensor optical system with stable focal length, and belongs to the technical field of optical systems. The invention solves a problem that an existing star sensor optical system does not consider the influence of the temperature on the sensitivity of the focal length while the athermalization design is realized. The focal power of each of a first lens, a second lens, a fourth lens and a fifth lens is positive; the focal power of each of a third lens and a sixth lens is negative; an aperture diaphragm is located between the third lens and the fourth lens; the first to sixth lenses and an image plane are sequentially arranged along an optical axis in a light incident direction; the first lens is made of SILICA; the second lens is made of D-LAF50; the third lens is made of H-ZF7LA; the fourth lens is made of D-ZPK1A; the fifth lens is made of H-ZLAF69; the sixth lens is made of H-ZF7LA; and a mechanical structure is made of titanium alloy. The positive and negative lenses of different materials and the material of the mechanical structure are matched with each other, so that the sensitivity of the focal length changing with temperature is reduced while the optical passive athermalization design of the optical system is realized.

Description

technical field [0001] The invention relates to an athermalized star sensor optical system with stable focal length, belonging to the technical field of space optical systems. Background technique [0002] The star sensor takes the starry sky as the working object, images the stars in the celestial sphere on the focal plane of the star sensor optical system, and after the steps of star point centroid extraction, star map matching and attitude calculation, the space vehicle can be directly obtained The three-axis attitude information of . In the known inertial navigation equipment, the star sensor is one of the attitude measurement instruments with the highest measurement accuracy, and its measurement accuracy can reach the sub-arc second level. According to the requirements of the star sensor, the optical system of the star sensor should have the characteristics of large relative aperture, large field of view, low distortion and small size. [0003] The star sensor is inst...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B1/00
CPCG02B1/00G02B13/00
Inventor 钟兴张坤刘江
Owner CHANGGUANG SATELLITE TECH CO LTD
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