CN216593811U - Long-focus large-relative-aperture high-definition medium-wave infrared refrigeration optical system - Google Patents
Long-focus large-relative-aperture high-definition medium-wave infrared refrigeration optical system Download PDFInfo
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- CN216593811U CN216593811U CN202122544738.2U CN202122544738U CN216593811U CN 216593811 U CN216593811 U CN 216593811U CN 202122544738 U CN202122544738 U CN 202122544738U CN 216593811 U CN216593811 U CN 216593811U
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Abstract
A long-focus large-relative-aperture high-definition medium-wave infrared refrigeration optical system comprises: primary mirror, secondary mirror, beam shrinking lens, converging lens group and relay lens group. The center of the primary mirror is provided with a through hole; the secondary mirror, the beam reducing lens, the converging lens group and the relay lens group are sequentially arranged along the axis; the light beam is reflected by the secondary mirror and then forms a perfect image point behind the primary mirror; the primary mirror and the secondary mirror are hyperboloids, and form an RC optical system; the focus of the beam-shrinking lens coincides with the focus of the RC optical system; after passing through the beam-shrinking lens, the light rays are formed into parallel light beams and are incident on the converging lens group; the converging lens group is used for carrying out primary imaging on a target to obtain a primary image; the relay lens group is used for imaging the primary image onto a focal plane of the detector. The invention realizes high-definition imaging with large relative aperture under the requirement of long acting distance.
Description
Technical Field
The invention belongs to the technical field of infrared imaging, and particularly relates to a long-focal-length large-relative-aperture high-definition medium-wave infrared refrigeration optical system.
Background
With the development of infrared imaging technology, infrared imaging optical systems are increasingly applied to the field of military and civilian use. With the increasing application of infrared optical systems, the requirements for infrared imaging systems are also increasing.
The detection and identification of distant objects requires higher resolution, including spatial resolution and energy resolution, of infrared systems. The relative aperture (inverse of the F-number) of an infrared system largely determines the energy harvesting capability of the system, with the larger the relative aperture, the more the optical system is able to capture, and the higher the energy resolution.
For uncooled detectors, the relative aperture can be left large, typically higher than 1/1.2, because cold stop matching issues need not be considered, but the response sensitivity of uncooled detectors is far less than that of cooled detectors, and therefore for long-distance target imaging, cooled detectors are typically the main focus.
The refrigeration type detector is usually used with relative aperture of 1/2, 1/4, 1/5.5, and the detector can be customized according to the requirement of the customer.
In consideration of spatial resolution, the smaller the detector pixel size, the longer the optical system focal length, and the higher the spatial resolution. When the detector pixel size is fixed (conventionally 15um and 30um), the longer the optical system focal length is, the higher the spatial resolution is.
As the focal length increases, the field angle decreases, which is not favorable for acquiring the information around the object. When the focal length and the size of the detector pixel are fixed, the number of the detector pixels is increased, so that a larger field angle can be obtained.
From the design point of view, for a long-focus optical system, the design difficulty of the optical system will be greatly increased by increasing the relative aperture and increasing the requirements of the detector pixels.
At present, the medium wave refrigeration detector is upgraded to a 1280 x 1024 high-definition detector, so that a medium wave infrared refrigeration optical system which is suitable for the 1280 x 1024 high-definition detector and has a long focal length and a large relative aperture is very necessary.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the medium wave infrared refrigeration optical system with the long focal length and the large relative aperture high-definition imaging is provided, and the problem of large relative aperture high-definition imaging under the requirement of a long acting distance is solved.
The technical solution of the invention is as follows:
a long-focus large-relative-aperture high-definition medium-wave infrared refrigeration optical system comprises: the device comprises a primary mirror, a secondary mirror, a beam shrinking lens, a converging lens group and a relay lens group;
the center of the primary mirror is provided with a through hole;
the secondary lens, the beam shrinking lens, the converging lens group and the relay lens group are sequentially arranged along the axis;
the light beam is reflected by the secondary mirror and then forms a perfect image point behind the primary mirror;
the primary mirror and the secondary mirror are hyperboloids to form an RC optical system;
the focal point of the beam shrinking lens is superposed with the focal point of the RC optical system;
after the light passes through the beam shrinking lens, parallel light beams are formed and are incident on the converging lens group;
the converging lens group is used for carrying out primary imaging on a target to obtain a primary image;
the relay lens group is used for imaging the primary image onto a focal plane of the detector.
Optionally, the focal length is greater than 700 mm.
Optionally, the converging lens group comprises: the lens comprises a first converging lens and a second converging lens.
Optionally, the materials of the first collecting lens and the second collecting lens are silicon and germanium, respectively.
Optionally, the relay lens group includes: a first relay lens and a second relay lens.
Optionally, the materials of the first relay lens and the second relay lens are both silicon.
A spectroscope for multispectral light splitting is arranged between the beam-shrinking lens and the converging lens group.
Optionally, a fast reflector for image stabilization of the long-acting-distance reflector is further arranged between the beam reduction lens and the converging lens group.
Optionally, the material of the beam-reducing lens is zinc selenide.
Compared with the prior art, the invention has the advantages that:
1) the invention has long focal length, large relative aperture and high-definition imaging, long action distance, sufficient energy and large field angle;
2) the long-focus large-relative-aperture high-definition medium-wave infrared refrigeration optical system has the advantages of simple optical path and high transmittance: the light path consists of two reflectors and five lenses, and the transmittance reaches more than 85%;
3) the high-definition medium wave infrared refrigeration optical system with the long focal length and the large relative aperture has strong expansibility: a parallel light path is introduced behind the beam-shrinking lens, and a spectroscope and a quick reflector can be placed according to requirements to realize multispectral imaging and remote reflector image stabilization;
4) the invention discloses a long-focus large-relative-aperture high-definition medium wave infrared refrigeration optical system which is a modular design system and can be compatible with multiple 1280 x 1024 high-definition detectors.
Drawings
FIG. 1 is a diagram of the optical path structure of the present invention;
FIG. 2 is a diagram of a transfer function;
fig. 3 is a dot diagram of an optical system.
Detailed Description
As shown in fig. 1, the present invention provides a long-focus large-relative-aperture high-definition medium-wave infrared refrigeration optical system, which includes: the device comprises a primary mirror 1, a secondary mirror 2, a beam shrinking lens 3, a converging lens group 4 and a relay lens group 5. The center of the primary mirror 1 is provided with a through hole; the secondary mirror 2, the beam shrinking lens 3, the converging lens group 4 and the relay lens group 5 are sequentially arranged along the axis; the light beam is reflected by the secondary mirror 2 and then forms a perfect image point at the rear of the primary mirror 1; the primary mirror 1 and the secondary mirror 2 are hyperboloids, and form an RC optical system; the focal point of the beam-reducing lens 3 coincides with the focal point of the RC optical system; after passing through the beam-shrinking lens 3, the light forms parallel light beams and is incident on the converging lens group 4; the converging lens group 4 is used for carrying out primary imaging on a target to obtain a primary image; and a 1280 x 1024 medium wave infrared refrigeration detector is arranged behind the optical path of the relay lens group 5, so that medium wave infrared high-definition imaging is realized. The relay lens group 5 is used for imaging the primary image onto the focal plane of the detector.
The focal length of the long-focal-length large-relative-aperture high-definition medium-wave infrared refrigeration optical system is larger than 700 mm.
The collective lens group 4 includes: the lens comprises a first converging lens and a second converging lens. The materials of the first converging lens and the second converging lens are respectively silicon and germanium.
The relay lens group 5 includes: a first relay lens and a second relay lens. The materials of the first relay lens and the second relay lens are both silicon.
A spectroscope for multispectral light splitting is further arranged between the beam-reducing lens 3 and the converging lens group 4. A fast reflector for stabilizing the image of the long-acting-distance reflector is also arranged between the beam-reducing lens 3 and the converging lens group 4. The material of the beam-reducing lens 3 is zinc selenide. The aperture of the light beam reaching the position of the primary mirror 1 after being reflected by the secondary mirror 2 is effectively compressed, and the purpose of reducing the blocking ratio of the secondary mirror 2 is achieved.
Examples
The optical system parameters were as follows:
focal length: 750 mm;
f/#:3.4 or more;
wavelength: 3-5 um;
adapting the detector: 1280 × 1024/15um, 1280 × 1024/12um, 1280 × 1024/10um and 1280 × 1024/7.5 um.
FIG. 2 is a modulation transfer function graph @67lp/mm of a medium wave infrared refrigeration optical system with a focal length of 750mmF # 3.4. The transfer function is close to the diffraction limit, and the image quality is good.
Fig. 3 is a schematic diagram of a 750mmF #3.4 high-definition medium-wave infrared refrigeration optical system. The diffuse spot has small size and good image quality.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (9)
1. The utility model provides an infrared refrigeration optical system of big relative aperture high definition medium wave of long focal length which characterized in that includes: the device comprises a primary mirror (1), a secondary mirror (2), a beam shrinking lens (3), a converging lens group (4) and a relay lens group (5);
the center of the primary mirror (1) is provided with a through hole;
the secondary mirror (2), the beam shrinking lens (3), the converging lens group (4) and the relay lens group (5) are sequentially arranged along the axis;
the light beam is reflected by the secondary mirror (2) and then forms a perfect image point behind the primary mirror (1);
the primary mirror (1) and the secondary mirror (2) are hyperboloids, and form an RC optical system;
the focus of the beam-reducing lens (3) coincides with the focus of the RC optical system;
after passing through the beam-shrinking lens (3), the light forms parallel light beams to be incident on the converging lens group (4);
the converging lens group (4) is used for carrying out primary imaging on a target to obtain a primary image;
the relay lens group (5) is used for imaging the primary image onto a focal plane of the detector.
2. The infrared refrigeration optical system of claim 1, which is characterized in that: the focal length is larger than 700 mm.
3. A long focal length large relative aperture high definition medium wave infrared refrigeration optical system according to claim 2, characterized in that the converging lens group (4) comprises: the lens comprises a first converging lens and a second converging lens.
4. The infrared refrigeration optical system of claim 3, wherein the first and second condensing lenses are made of silicon and germanium, respectively.
5. A long focal length large relative aperture high definition medium wave infrared refrigeration optical system according to claim 4, characterized in that the relay lens group (5) comprises: a first relay lens and a second relay lens.
6. The infrared refrigeration optical system of claim 5 with long focal length, large relative aperture and high definition medium wave, characterized in that: the materials of the first relay lens and the second relay lens are both silicon.
7. The infrared refrigeration optical system with long focal length, large relative aperture and high definition medium wave as claimed in any one of claims 1 to 6, characterized in that: a spectroscope used for multispectral light splitting is further arranged between the beam reducing lens (3) and the converging lens group (4).
8. The infrared refrigeration optical system with long focal length, large relative aperture and high definition medium wave as claimed in any one of claims 1 to 6, characterized in that: a fast reflector for stabilizing the image of the long-acting-distance reflector is also arranged between the beam reducing lens (3) and the converging lens group (4).
9. The optical system for refrigerating medium wave infrared with long focal length and large relative aperture and high definition according to claim 8 is characterized in that the material of the beam shrinking lens (3) is zinc selenide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122544738.2U CN216593811U (en) | 2021-10-20 | 2021-10-20 | Long-focus large-relative-aperture high-definition medium-wave infrared refrigeration optical system |
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| CN202122544738.2U CN216593811U (en) | 2021-10-20 | 2021-10-20 | Long-focus large-relative-aperture high-definition medium-wave infrared refrigeration optical system |
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