A Focal Length Stabilized Athermalized Star Sensor Optical System

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, and meet the requirements of light weight, large relative aperture, and reduced temperature control Effect

Active Publication Date: 2021-07-27
CHANGGUANG SATELLITE TECH CO LTD
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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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  • A Focal Length Stabilized Athermalized Star Sensor Optical System
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  • A Focal Length Stabilized Athermalized Star Sensor Optical System

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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

An athermalized star sensor optical system with stable focal length belongs to the technical field of optical systems. The invention solves the problem that the existing star sensor optical system does not take into account the sensitivity influence of the temperature on the focal length while realizing the athermalization design. The refractive powers of the first lens, the second lens, the fourth lens and the fifth lens are all positive, the refractive powers of the third lens and the sixth lens are negative, and the aperture stop is located between the third lens and the fourth lens. In between, the first to sixth lenses and the image plane are arranged in sequence along the incident direction of light and the optical axis. The material of the first lens is SILICA, the material of the second lens is D-LAF50, and the material of the third lens is H-ZF7LA. The material of the fourth lens is D‑ZPK1A, the material of the fifth lens is H‑ZLAF69, the material of the sixth lens is H‑ZF7LA, and the mechanical structure material is titanium alloy. The positive and negative lenses of different materials are matched with the mechanical structure materials, which reduces the sensitivity of the focal length to temperature changes while realizing the optical passive athermalization design of the optical system.

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...

Claims

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Application Information

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Patent Type & Authority Patents(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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