Hyper-hemispherical staring infrared imaging system containing diffraction element

Abstract

The super half ball focusing infrared imaging system with diffraction components uses positive and negative division with the negative group at the front to get the imaging without blind area, using middle wave infrared band with wave length ranging 3-5 mum. The No. 1 negative light group is a single negative lens, the No. 2 positive light group being the positive and negative separated three plates structure of three sets, with one diffraction lens with 2W=200 degree viewing angle, relative caliber D / f'=12, image size 2y'=12mm. The cold diaphragm at the rear side of the system working as the caliber diaphragm of the overall optical system realizing 100 percent effect. It can detect the distance ranging from 80 to 100 mm from the No. 1 surface to the surface of the detector.

Description

Technical field [0001] The invention relates to a super-hemispherical staring infrared imaging system containing a diffraction element. Background technique [0002] The hyper-hemispheric imaging system is also called the panoramic imaging system, which has a wide range of applications in various fields such as economy, technology, military, and commerce. This system has a large amount of imaging information, and is particularly suitable for use in various monitors. This system can be implemented in three ways. One is to use multiple optical system arrays. Each system only undertakes the imaging task of a part of the field of view, and obtains a composite image through processing. Therefore, higher requirements are placed on image processing. ; The second is that an optical system realizes panoramic surveillance by scanning. At a certain instant, only a part of the field of view can be seen. It is impossible to see the hyper-hemispherical panoramic image at the same time. When th...

AI Technical Summary

Problems solved by technology

If the aperture diaphragm of the system is not a cold diaphragm and cannot be imaged on the cold diaphragm, the efficiency of the cold diaphragm cannot reach 100%, which not only makes the imaging illumination uneven, but more importantly, sideband radiation appears on the image surface, resulting in additional Photon noise, which seriously affects the signal-to-noise ratio of the detector

The requirement of 100% cold stop efficiency makes this type of system extremely asymmetrical; and because the materials available are limited, and the system must ensure a certain energy transmittance, the entire optical system must be as simple as possible, and the number of lenses should be as small as possible. It also brings great difficulties to correct aberrations, especially chromatic aberrations.

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