Infrared double wave band refraction/diffraction mixed optical imaging system

An optical imaging system and refraction-diffraction mixing technology, which is applied in the field of optical systems and optical elements, can solve the problems of low diffraction efficiency of diffraction elements, achieve the effect of simplifying the structure and improving the light transmission efficiency of the system

Inactive Publication Date: 2002-06-05
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to: design a refraction-diffraction hybrid infrared dual-band imaging optical system, and solve the problem of low diffraction efficiency of the above-mentioned dual-band optical system by using two central blaze wavelength diffraction elements in the optical system

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  • Infrared double wave band refraction/diffraction mixed optical imaging system
  • Infrared double wave band refraction/diffraction mixed optical imaging system
  • Infrared double wave band refraction/diffraction mixed optical imaging system

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Embodiment Construction

[0011] According to attached figure 1 The optical structure of the infrared dual-band refraction-diffraction hybrid optical imaging system is shown. We have designed a spaceborne dual-band infrared optical imaging system. The specific indicators of the system are:

[0012] 1. Satellite height: 650Km;

[0013] 2. Ground resolution: 300m;

[0014] 3. Width of swath: 720Km;

[0015] 4. Imaging band: 3.50~3.90μm and 10.5~12.5μm;

[0016] 5. Detector: InSb / HgCdTe dual-color device (unit size: 80μm×80μm) According to the overall index of the imaging system, the technical parameters of the dual-band infrared optical system we designed are:

[0017] 1. Focal length: 173.3mm;

[0018] 2. Relative caliber: 1 / 2.5;

[0019] 3. Instantaneous field of view: 0.46mrad;

[0020] 4. Field of view: 0.5°

[0021] The specific design data of the optical system is shown in Table 1. Table 1 Optical component name, surface number, radius of curvature, interval or thickness, material

[0022] ...

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Abstract

An imaging optical system consists of front lens combination with diffraction element and rear lens combination, and features that the diffraction element is flashing binary one with double central wavelengths in both 3-5 micron band and 8-12 micron band. the imaging optical systme has high transmission efficiency, is simple in structure and may be used in airborne carrier and satellite based remote sensing infrared system and other fields.

Description

technical field [0001] The invention relates to an optical element and an optical system, in particular to an infrared dual-band refraction-diffraction hybrid optical imaging system used in the fields of airborne or spaceborne infrared remote sensing and the like. technical background [0002] The dual-band infrared optical imaging system has been the object of research and development by researchers of infrared optical systems at home and abroad because it can simultaneously image 3-5μm and 8-12μm bands. Due to the limitation of the performance of traditional infrared optical components, it is difficult for traditional infrared optical systems to simultaneously image the two bands of 3-5 microns and 8-12 microns, and special methods must be adopted to achieve dual-band imaging. Kebo, Reynold S. of the United States achieved dual-band conversion imaging on the traditional infrared optical system by inserting an additional lens group (European patent: EP: 0367197 B1), and Her...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/02G02B13/14G02B23/00
Inventor 沈蓓军薛永祺汪骏发
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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