Medium-wave infrared searching and tracking lens based on compensating mirror

Abstract

The invention belongs to the field of optical devices, and particularly relates to a medium-wave infrared searching and tracking lens based on a compensating mirror. By integrating the compensating mirror in an optical system of the lens, the lens is good in imaging quality, compact in structure, low in compensating mirror control difficulty and high in economy and can meet the actual use requirements. The basic structure of the lens comprises a first objective lens, a second objective lens, the compensating mirror, a first projection objective lens, a second projection objective lens, a thirdprojection objective lens, a fourth protection objective lens and a fifth projection objective lens. Light radiation of a detection target is gathered on a primary image surface by the first objective lens, the second objective lens and the compensating mirror and then imaged on a photosensitive surface of an external thermal infrared imager by the first projection objective lens, the second projection objective lens, the third projection objective lens, the fourth protection objective lens and the fifth projection objective lens, and meanwhile the requirement for imaging an entrance pupil ona cold screen of an external self-cooled type detector is met.

Description

technical field [0001] The invention belongs to the field of optical equipment, and in particular relates to a mid-wave infrared search and tracking lens based on a compensation mirror. Background technique [0002] The infrared search and track system rotates along the azimuth at a certain speed, and through the equipped infrared search and track imaging system, it can image the surrounding azimuth 360° and within a certain distance, so as to detect suspicious targets and play an early warning role. Because there is no blind spot in the 360° azimuth imaging and the detection probability is high, it is widely used, especially in military early warning, border defense monitoring, forest fire prevention, etc. [0003] The infrared search and tracking system realizes the azimuth 360° imaging methods mainly include: line scan imaging, staring device slow scan imaging, staring device step scan imaging and reverse scan compensation imaging. Among them, the reverse scanning compen...

AI Technical Summary

Problems solved by technology

figure 1 It is a common layout for the medium compensation mirror to be located in front of the infrared search and track lens. The design of the infrared search and track lens in this layout is simple, and its imaging quality is only related to the compensation mirror surface type (small-caliber high-precision surface type is less difficult to process), and its corner Irrelevant, so the image quality of the system is good, but the compensation mirror is placed in the optical path at the front of the lens at a certain angle. In order to detect a large field of view, the size of the compensation mirror is required to be large, the control is difficult, and the economy is poor.

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