350mm aperture 1778.9mm focal length 0.4~5μm band off-axis triple mirror optical system

Abstract

The invention relates to an off-axis three-reflex optical system with a 350mm aperture, a 1778.9mm focal length and a 0.4-5mu m wave band, belonging to the technical field of target simulation. The existing off-axis three-reflex optical system has a small aperture and short focal length and lacks a visible light working wave band. The off-axis three-reflex optical system is characterized in that aprimary mirror and a third mirror are high-order aspheric reflectors with square apertures, a secondary mirror is a spherical reflector with a round aperture, the primary mirror is a positive refractive power reflector, and has a -2980mm curvature radius, a 560mm*570mm light aperture, and 410mm off-axis amount, the secondary mirror is a negative refractive power reflector, and has a -2000mm curvature radius and a 81mm light aperture, the third mirror is a positive refractive power reflector, and has a -3613.9mm curvature radius, a 1000mm*1010mm light aperture and a -846mm off-axis amount, a distance between a curvature center of the primary mirror and a curvature center of the secondary mirror is 2650mm, a distance between a curvature center of the secondary mirror and a curvature centerof the third mirror is 2928.4mm, and the off-axis three-reflex optical system has a 350mm aperture, a 1778.9mm focal length and a 0.4-5mu m working wave hand.

Description

technical field [0001] The invention relates to an off-axis three-mirror optical system with a 350mm diameter and a 1778.9mm focal length of 0.4 to 5 μm band, belonging to the technical field of target simulation. Background technique [0002] With the development of photoelectric detection technology, multi-band target imaging detection is more and more widely used in military affairs. Usually, visible light detectors, infrared light detectors, low-light detectors and laser range finders are integrated to form a multi-view The axis photoelectric tracking system can detect, identify and track dynamic targets in multiple bands. [0003] The target simulation optical system can provide infinite dynamic targets for the photoelectric tracking system, and at the same time, cooperate with the calibration of the visual axis consistency of the photoelectric tracking system to assist the test of the dynamic performance of the photoelectric tracking system, that is, the simulation tes...

AI Technical Summary

Problems solved by technology

However, there are some problems in the target simulation optical system. First, the diameter of the exit pupil is small, which cannot meet the calibration and detection requirements of the multi-axis photoelectric tracking system. Secondly, the focal length is short. The focal length of each detection unit in the photoelectric tracking system is 200 Between ~300mm, according to optical design and actual use requirements, the focal length of the target analog optical system should be more than 5 times the focal length of the photoelectric tracking system; third, the working band includes 3~5μm and 8~12μm, however, these two infrared The wave bands are used in conjunction with each other. In fact, one of the wave bands can complete the detection, identification, and tracking of dynamic targets. However, this solution lacks the visible light band in the working band, and many photoelectric tracking systems include visible light band detection.

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