CN109445066B - Medium wave infrared and laser common-path imaging optical system - Google Patents
Medium wave infrared and laser common-path imaging optical system Download PDFInfo
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- CN109445066B CN109445066B CN201811335840.8A CN201811335840A CN109445066B CN 109445066 B CN109445066 B CN 109445066B CN 201811335840 A CN201811335840 A CN 201811335840A CN 109445066 B CN109445066 B CN 109445066B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 51
- 238000003384 imaging method Methods 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000001228 spectrum Methods 0.000 claims abstract description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 8
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 8
- 102100031503 Barrier-to-autointegration factor-like protein Human genes 0.000 claims description 4
- 101000729827 Homo sapiens Barrier-to-autointegration factor-like protein Proteins 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 230000004075 alteration Effects 0.000 abstract description 3
- 238000003331 infrared imaging Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 230000004297 night vision Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000003897 fog Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
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Abstract
The invention relates to a medium wave infrared and laser common-path imaging optical system, which is a difficult problem of optical design all the time, and is difficult to eliminate due to large chromatic aberration introduced by a wide spectrum, and less optical materials are used for the wide spectrum. The invention designs a light path by combining a low-refractive-index material with an aspheric surface, and comprises a first objective lens, a second objective lens, a third objective lens and a fourth objective lens which are sequentially arranged along the light path, wherein the fixed lens group consists of a first fixed lens and a second fixed lens, and the converging lens group consists of a first converging lens, a second converging lens and a third converging lens. The medium wave infrared and laser common-path imaging optical system shortens the system caliber through secondary imaging, keeps 100% of cold diaphragm efficiency, and realizes the medium wave infrared and laser common-path by adopting a low-refractive-index material mode.
Description
Technical Field
The invention belongs to the technical field of optical equipment, and relates to a medium wave infrared and laser common-path imaging optical system.
Background
The photoelectric detection system needs to have a very long working distance and high-resolution imaging performance, and can meet the requirements of high integration and small volume. At present, a medium wave infrared imaging system is more and more widely applied in the fields of navigation, observation, tracking and the like, and particularly in the night environment, the infrared system has strong capability of penetrating smoke and dust and can work at night; the passive infrared system has good concealment and strong confidentiality and is not easy to be interfered; the method is characterized in that detection is carried out according to the temperature difference and the emissivity difference between a target and a background, and the capability of identifying camouflage is higher than the visible light intensity; the infrared system has small volume, light weight and low power consumption, and is suitable for the precise guided weapon to be widely applied to the modern optical system.
The short wave infrared can provide information which can not be provided by visible light, low-light night vision, medium wave and long wave infrared, and compared with medium wave and long wave infrared imaging, the short wave infrared imaging mainly utilizes short wave infrared radiation in room-temperature scenery reflection environment to realize detection, and the image has a better dynamic range, and the details are clearer, so that target identification can be realized. Compared with visible light, the short-wave infrared imaging system can realize all-weather target monitoring day and night, has strong capability of penetrating fog, mist and smoke dust, and can clearly see the target details under the smoke. The short wave infrared imaging technology can be applied to the fields of night vision, reconnaissance and monitoring, remote sensing systems, aviation safety, photoelectric countermeasure and the like.
The medium-wave infrared and laser common-path imaging optical system can provide a night-vision infrared image and can see short-wave laser spots, so that the target positioning and accurate aiming can be irreplaceable, and more users favor the system.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a medium-wave infrared and laser common-path imaging optical system.
Technical scheme
A medium wave infrared and laser common-path imaging optical system is characterized by comprising an objective lens group, a fixed lens and a converging lens group; a first objective lens 1, a second objective lens 2, a third objective lens 3, a fourth objective lens 4, a first fixed lens 5, a second fixed lens 6, a first convergent lens 7, a second convergent lens 8 and a third convergent lens 9 are arranged along an optical path in sequence; the focal length of the light path is 100 mm-300 mm; the F-numbers that can be matched are: 4 or 5; the matched optical wavelength is 3 um-5 um and 1064 nm; the optical components incorporate four aspheric surfaces, and the specific parameters and materials are shown in the following table:
| serial number | Surface type | Radius (mm) | Thickness (mm) |
| First objective lens 1 | Spherical surface | 134.29 | 20 |
| Aspherical surface | 153.1556 | 1.765 | |
| Second |
Spherical surface | 155.626 | 5 |
| Spherical surface | 44.805 | 3 | |
| Third |
Spherical surface | 46.259 | 15 |
| Spherical surface | -118.433 | 1.883 | |
| Fourth objective lens 4 | Aspherical surface | -137.051 | 5 |
| Spherical surface | -188.133 | 20.485 | |
| First fixed |
Spherical surface | 159.9 | 4.88 |
| Aspherical surface | 116.7429 | 73.41 | |
| Second fixed |
Spherical surface | 12.74 | 2.52 |
| Spherical surface | 18.012 | 8 | |
| First condenser lens 7 | Spherical surface | -7.997 | 3 |
| Spherical surface | -8.165 | 0.715 | |
| |
Spherical surface | -12.623 | 11.15 |
| Spherical surface | -41.875 | 0.47 | |
| Third converging mirror 9 | Spherical surface | 9.547 | 9.495 |
| Spherical surface | 11.4372 | 0.3835 | |
| Diaphragm | 20.47 |
The first objective lens 1, the first fixed lens 5 and the third converging lens 9 are made of ZNSE materials; the second objective lens 2, the first converging lens 7 and the second converging lens 8 are made of calcium fluoride crystal materials; the third objective lens 3 adopts BAF2 material; the fourth objective lens 4 is made of Schottky IRG24 material.
And a detector is arranged behind the optical path of the third converging mirror 9, a refrigeration type detector is selected, and a focal plane detector with 256 pixel counts 256 × 256 and 30um pixel size or a focal plane detector with 512 pixel counts 512 × 512 and 15um pixel size is selected, so that the spectrum with the applicable wavelength of 3 um-5 um and 1064nm is adopted.
Advantageous effects
According to the medium wave infrared and laser common-path imaging optical system provided by the invention, a wide spectrum common-path optical system is always a difficult problem in optical design, large chromatic aberration introduced by a wide spectrum is difficult to eliminate, and optical materials used by the wide spectrum are less. The optical path is designed by combining a low-refractive-index material with an aspheric surface, and the optical path comprises an objective lens group, a fixed lens group and a converging lens group which are sequentially arranged along the optical path, wherein the objective lens group comprises a first objective lens 1, a second objective lens 2, a third objective lens 3 and a fourth objective lens 4, the fixed lens group comprises a first fixed lens 5 and a second fixed lens 6, and the converging lens group comprises a first converging lens 7, a second converging lens 8 and a third converging lens 9. The medium wave infrared and laser common-path imaging optical system shortens the system caliber through secondary imaging, keeps 100% of cold diaphragm efficiency, and realizes the medium wave infrared and laser common-path by adopting a low-refractive-index material mode.
The medium wave infrared and laser common-path imaging optical system adopts a secondary imaging design and adopts a low-refractive index material mode to realize the medium wave infrared and laser common-path. The objective lens group can realize the focusing function at a temperature of between 55 ℃ below zero and 70 ℃. The optical system has a volume of no more than 350mm × 72mm × 72 mm. The focal length of the light path is 100 mm-300 mm. The F-number that the optical system can match is: 4 or 5.
Drawings
FIG. 1 is a schematic view of a common-path imaging optical system for medium-wave infrared and laser light according to the present invention
The objective lens system comprises a first objective lens 1, a second objective lens 2, a third objective lens 3, a fourth objective lens 4, a first fixed lens 5, a second fixed lens 6, a first converging lens 7, a second converging lens 8 and a third converging lens 9.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
as shown in fig. 1, the optical device of the present invention includes a medium wave infrared and laser light common path imaging optical system, the medium wave infrared and laser light common path imaging optical system includes an objective lens group, a fixed lens group, and a converging lens group sequentially arranged along an optical axis, the first objective lens 1 is made of ZNSE, the second objective lens 2 is made of calcium fluoride crystal, the third objective lens 3 is made of BAF2, the fourth objective lens 4 is made of schottky IRG24, the first fixed lens 5 is made of ZNSE, the second fixed lens 6 is made of ZNS, the first converging lens 7 is made of calcium fluoride crystal, the second converging lens 8 is made of calcium fluoride crystal, and the third converging lens 9 is made of ZNSE. In this embodiment, the detector is a refrigeration detector.
In this embodiment, the focal length of the optical path is 100mm to 300mm, the maximum aperture of the optical system is 127.6mm, and the volume of the optical system is 350mm × 72mm × 72 mm.
In this embodiment, this system uses 9 lenses to realize that medium wave infrared and laser share light path imaging optical system's building.
In this embodiment, the detector is a refrigeration detector, and a focal plane detector with 256 × 256 pixels and a pixel size of 30um or a focal plane detector with 512 × 512 pixels and a pixel size of 15um is used, and is suitable for spectra with a wavelength of 3um to 5um and a wavelength of 1064 nm.
In this example, the F-number that the optical system can match is: 4 or 5.
The first objective lens 1 is made of ZNSE, the second objective lens 2 is made of calcium fluoride crystals, the third objective lens 3 is made of BAF2, the fourth objective lens 4 is made of Schottky 24, the first fixed lens 5 is made of ZNSE, the second fixed lens 6 is made of ZNS, the first converging lens 7 is made of calcium fluoride crystals, the second converging lens 8 is made of calcium fluoride crystals, and the third converging lens 9 is made of ZNSE. The optical components introduce four aspheric surfaces, and the effects of correcting aberration and improving image quality are realized through less lens number. Specific parameters and materials are shown in table 1.
TABLE 1 optical System compositions and parameters
When the optical device of the embodiment is used, the light path can respond to the medium wave infrared and also can respond to the 1064nm wave band of laser, the two wave bands can be imaged on the detector simultaneously, and then the light spot of the laser can be observed while the medium wave is imaged.
In other embodiments of the optical device of the present invention, the number of the objective lens group, the fixed lens group, and the converging lens group may be set according to specific needs.
Various alternatives to the mid-wave infrared and laser co-path imaging optical system in the above-described embodiments of the optical apparatus are also applicable to the embodiments of the mid-wave infrared and laser co-path imaging optical system of the present invention.
Claims (4)
1. A medium wave infrared and laser common-path imaging optical system is characterized by comprising an objective lens group, a fixed lens and a converging lens group; a first objective lens (1), a second objective lens (2), a third objective lens (3), a fourth objective lens (4), a first fixed lens (5), a second fixed lens (6), a first convergent lens (7), a second convergent lens (8) and a third convergent lens (9) are arranged along a light path in sequence; the focal length of the light path is 100 mm-300 mm; the F-numbers that can be matched are: 4 or 5; the matched optical wavelength is 3 um-5 um and 1064 nm; the optical components incorporate four aspheric surfaces, and the specific parameters and materials are shown in the following table:
。
2. The medium wave infrared and laser co-path imaging optical system of claim 1, characterized in that: the first objective lens (1), the first fixed lens (5) and the third converging lens (9) are made of ZNSE materials; the second objective (2), the first converging lens (7) and the second converging lens (8) are made of calcium fluoride crystal materials; the third objective lens (3) adopts BAF2 material; the fourth objective lens (4) is made of Schottky IRG24 material.
3. The medium wave infrared and laser co-path imaging optical system of claim 1, characterized in that: the objective lens group is focused at-55 ℃ to +70 ℃.
4. The medium wave infrared and laser co-path imaging optical system according to claim 1, 2 or 3, characterized in that: and a detector is arranged behind the optical path of the third converging mirror (9), a refrigeration type detector is selected, and a focal plane detector with 256 pixel counts 256 × 256 and 30um pixel size or a focal plane detector with 512 pixel counts 512 × 512 and 15um pixel size is adopted, so that the spectrum with the applicable wavelength of 3 um-5 um and 1064nm is adopted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811335840.8A CN109445066B (en) | 2018-11-11 | 2018-11-11 | Medium wave infrared and laser common-path imaging optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811335840.8A CN109445066B (en) | 2018-11-11 | 2018-11-11 | Medium wave infrared and laser common-path imaging optical system |
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| Publication Number | Publication Date |
|---|---|
| CN109445066A CN109445066A (en) | 2019-03-08 |
| CN109445066B true CN109445066B (en) | 2021-01-01 |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204287588U (en) * | 2014-12-22 | 2015-04-22 | 福建福光数码科技有限公司 | Refrigeration mode medium-wave infrared and laser bimodulus Shared aperture camera lens |
| US9903757B1 (en) * | 2015-09-25 | 2018-02-27 | Hrl Laboratories, Llc | Active multi-spectral sensor |
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