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Low-distortion large-relative-aperture refrigeration type athermalization infrared wide-angle optical system

A wide-angle optical system and relative aperture technology, applied in the field of infrared optics, can solve the problems of not achieving athermalization, small relative aperture, large imaging distortion, etc., and achieve the effect of compact structure, compensation for defocusing, and excellent imaging.

Inactive Publication Date: 2021-06-11
KUNMING YUNZHE HIGH TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems that the existing cooling type infrared wide-angle optical system does not realize athermalization, or the imaging distortion is large, or the relative aperture is small, or it is difficult to miniaturize, the present invention provides a cooling type athermalization with low distortion and large relative aperture Infrared wide-angle optical system

Method used

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  • Low-distortion large-relative-aperture refrigeration type athermalization infrared wide-angle optical system
  • Low-distortion large-relative-aperture refrigeration type athermalization infrared wide-angle optical system
  • Low-distortion large-relative-aperture refrigeration type athermalization infrared wide-angle optical system

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Embodiment 1

[0042] The optical system of this embodiment has four mirrors in total. From the object plane 4 to the focal plane 101, the first negative lens 301 with negative refractive power, the first positive lens 203 with positive refractive power, and the second negative lens with negative refractive power are arranged in sequence. The negative lens 202 , the second positive lens 201 with positive refractive power, the detector protection window 103 , and the detector cold stop 102 are arranged on the imaging plane 101 with the light-receiving surface of the focal plane detector.

[0043] The focal length of the entire system of the optical system of this embodiment=4.9mm, F / #=1.0, working wave band: 3.2 μ m ~ 4.8 μ m, full field of view: ± 72 °, the following table 1 and table 2 represent and embodiment involves Various numerical data related to cooled athermal infrared wide-angle optical system.

[0044] Table 1 The specific parameters (unit: mm) of each lens of the optical system o...

Embodiment 2

[0054] Such as image 3 As shown, the difference from Embodiment 1 is that it also includes a mirror 5 arranged between the front fixed mirror group 300 and the aberration correction group 200, and correspondingly adjusts the positions of the aberration correction group 100, the detector and the diaphragm, The front fixed mirror group 300 is located on the incident optical axis of the reflector 5, the aberration correction group 200 and the detector 100 are sequentially located on the reflected optical axis of the reflector 5, and the reflector 5 changes the transmission direction of the light beam, which can compress the entire optical system. The volume further meets the application requirements in environments with strict volume requirements.

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Abstract

The invention belongs to the field of infrared optics, and particularly discloses a low-distortion large-relative-aperture refrigeration type athermalization infrared wide-angle optical system, which comprises a front fixed lens group, an aberration correction group and a detector which are sequentially, coaxially and fixedly connected and arranged from an object plane to a focal plane. The detector comprises a detector protection window, a detector cold diaphragm and a focal plane which are sequentially arranged from an object plane to the focal plane along the the optical axis direction, and the position of the optical system aperture diaphragm coincides with that of the detector cold diaphragm; the front fixed lens group is of a single lens structure, consists of a first negative lens and is made of silicon. The aberration correction group is a three-separation lens group, a first positive lens, a second negative lens and a second positive lens are sequentially and coaxially arranged in the direction of the optical axis from the object plane to the focal plane, and are made of a chalcogenide material. The optical system provided by the invention adopts a common infrared optical material, can realize excellent imaging in a medium-wave infrared band range, and can well correct aberration associated with a large view field and a large aperture; and the optical system is easy to manufacture, high in imaging quality and good in stability.

Description

technical field [0001] The invention belongs to the field of infrared optics, in particular to a cooling type athermal infrared wide-angle optical system with a large relative aperture, which has the function of passive optical aberration. Background technique [0002] Infrared wide-angle optical system plays an important and irreplaceable role in forest fire prevention, public security and border defense, regional monitoring, situational awareness, etc. Moreover, in order to ensure the aperture efficiency of the entire system, the wide-angle optical system adapted to the cooled infrared detector needs to be matched with the detector cold aperture to achieve excellent stray light suppression. On the other hand, due to the large temperature refractive index coefficient of infrared optical materials, the performance of infrared optical systems is easily affected by environmental temperature changes, defocusing occurs, and imaging quality is reduced. Therefore, in order to impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/06G02B13/14G02B1/00G02B7/02
CPCG02B13/06G02B13/14G02B1/00G02B7/028
Inventor 许求真高良
Owner KUNMING YUNZHE HIGH TECH
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