Large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager

Abstract

The invention relates to a large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager and belongs to the technical field of imaging. The large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager is sequentially provided with a first crescent lens, a second crescent lens, a first biconcave lens, an aperture diaphragm, a first biconvex lens, a second biconvex lens, a biconcave lens, a third biconvex lens and a third crescent lens, wherein all lenses are disposed on the same optical axis; the first crescent lens, the second crescent lens and the first biconcave lens form a front lens group to realize primary imaging, and a convergence surface is located on the aperture diaphragm; the first biconvex lens, the second biconvex lens, the second biconcave lens, the third biconvex lens and the third crescent lens form a rear lens group to perform secondary imaging to a converged ray surface of the aperture diaphragm, and an image is located on an image surface. The large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager has the advantages that the components are simple and easy to manufacture, the system is small in size, the tolerance is good, the assembling is facilitated, the imaging quality is excellent, the all-field-of-view full-waveband modulation transfer function value at Nyquist frequency of 1001p / mm is superior to 0.48, and the imaging distortion is lower than 0.5 percent.

Description

technical field [0001] The invention belongs to the technical field of ultraviolet spectral imaging, and is a spectral imager optical system with a large field of view and a small F number with ultra-high spatial resolution under a certain ultraviolet bandwidth. Background technique [0002] High spatial resolution ultraviolet spectral imaging instruments play an important role in many research fields such as ultraviolet warning technology and ultraviolet atmospheric observation. Small high-resolution ultraviolet spectral imaging instruments can quickly and accurately locate missile threats with the advantages of low false alarm rate and high space coverage, which can help improve the early warning ability of short-range and short-range precision missiles; ozone and other gases in the atmosphere It will strongly absorb ultraviolet light between 200nm and 300nm. By carrying it on the space load, this type of instrument can well analyze and remote sensing the atmospheric compo...

AI Technical Summary

Problems solved by technology

[0003] 1. The transmission optical material has large dispersion in the ultraviolet band, the optional range is small, the Abbe number is similar, and the chromatic aberration of the design system is not easy to eliminate;

[0004] 2. The requirements for energy transmission and signal-to-noise ratio are high, so the F number of the system is small; at the same time, it is required to cover a large field of view, which leads to a large impact of on-axis point aberration and off-axis point aberration, and the imaging quality is not easy to improve;

[0005] 3. Limited by the detector and F number, the focal length of the system is small, and it is difficult to achieve high spatial resolution

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