A star sensor optical imaging system

Abstract

The invention relates to a spatial optical imaging system, and discloses a star sensor optical imaging system. The imaging system comprises a diaphragm and five lenses, wherein the five lenses are respectively a first lens, a second lens, a third lens, a fourth lens and a fifth lens; the diaphragm, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in sequence, and central axes of the diaphragm, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are coaxial; and the first lens and the third lens are aspherical positive lenses, the second lens and the fifth lens are spherical negative lenses, and the fourth lens is a spherical positive lens. According to the spatial optical imaging system, positive and negative lenses alternate with one another, the aspherical lenses and high-refractivity materials are adopted, so that curvature of refracting surfaces is reduced, off axis aberration is reduced, image plane distortion field curvature in the entire field-of-view range is small, and diameters of defocused spots of fields of view are evenly distributed.

Description

technical field [0001] The invention relates to a space optical imaging system, in particular to an engineered, light and miniaturized star sensor optical imaging system suitable for long-term application in high and low orbits in the space environment. Background technique [0002] The optical sensor technology uses starry sky imaging, and uses the star distance and azimuth information without deformation as a reference system for inertial attitude sensors for aircraft attitude navigation and positioning. Due to the advantages of high measurement accuracy and long-term use without drift, it has achieved great development since it was successfully developed in the 1950s. The optical technology of the optical sensor is especially guided by the technological development of the optical system of the star sensor. [0003] The "light and small star sensor optical system design" published in "Acta Photonica Sinica" in 2004 in China proposed an optical system with a focal length o...

AI Technical Summary

Problems solved by technology

The rear working distance of the system is very short, less than 2mm

The domestic star sensor optical system eliminates the use of glued mirrors to prevent the optical glue from deteriorating and falling off in the space environment, and the rear working distance of less than 2mm also brings greater difficulty to the assembly of detector components

Images