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Large-visual-field off-axis reflection zooming optical system

An optical system, off-axis reflection technology, applied in the direction of optics, optical components, instruments, etc., can solve the problems that cannot meet the requirements, and achieve the effect of simple structure, convenient detection and processing, and good imaging quality

Inactive Publication Date: 2015-10-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Description
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Problems solved by technology

[0005] The optical system 1) adopts the front fixed group with positive focal power, which has a large obscuration and a small field of view, which is 1°-3°; 2) the image plane is located behind the plane mirror, and has a large distance to the image plane Obscuration cannot meet the requirements of space optics systems for high-resolution imaging with a large field of view

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with accompanying drawing and example:

[0030] The invention according to figure 2 The structure shown is implemented, and its details are as follows figure 2 As shown, the system includes: a first primary mirror (1) with negative power, a second secondary mirror (2) with positive power, and a third mirror (3) with positive power , the detector (4), and the diaphragm (5) are located on the first main reflector; in consideration of subsequent environmental impact and lightweight design, the main and secondary reflectors (1), (2) and the third reflector (3 ) is made of silicon carbide or alternative materials suitable for space with high specific stiffness, close to zero expansion, and small thermal distortion, such as ULE and ZERODO. The detector image plane (4) adopts a CCD detector or other array detectors.

[0031] The optical system is arranged in an orderly manner according to the x, y, z rig...

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Abstract

The invention belongs to the technical field of aerospace detection and identification imaging optics, and provides a large-visual-field off-axis reflection zooming optical system. The optical system adopts a coaxial off-aperture and off-visual-field off-axis structure mode and is composed of a first negative reflecting mirror, a second positive reflecting mirror, a third positive reflecting mirror, a detector and a diaphragm. The diaphragm is arranged on the first negative reflecting mirror. The first main reflecting mirror 1 adopts a quadric surface with negative focal power to act as a front fixing group; the second positive quadric surface reflecting mirror acts as a zooming group to realize an objective of zooming; and the third reflecting mirror acts as a compensation group so that the large-visual-field zooming optical system with stable image surface can be obtained. According to the optical system with the structural type, three times of zooming of focal length of 25mm-75mm can be realized, the visual field can be 6.7-19 degrees, and the modulation transfer function (MTF) of each zooming position is greater than 0.3@50lp / mm so that imaging quality is quite high.

Description

technical field [0001] The invention belongs to a wide-spectrum segment, large field of view, high-resolution total reflection zoom optical system in the technical field of airborne detection and identification imaging optics. Background technique [0002] The total reflection zoom optical system with a photoelectric array detector as the imaging receiver has the characteristics of wide-spectrum and high-resolution imaging. In aerospace space reconnaissance and space observation, high-resolution photos of targets located at infinity can be obtained. , can be widely used in modern industry or airborne remote sensing and other fields, so it is favored by industrial and military departments. [0003] The total reflection zoom optical system commonly used at present all adopts the primary mirror with positive refractive power as the front fixed group. The coaxial total reflection zoom optical system has a small field of view and a large occlusion, which has a great impact on th...

Claims

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Application Information

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IPC IPC(8): G02B17/06G02B27/00
Inventor 常军谢桂娟周继德张柯杨盛谊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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