CN114236782B - Visible light near-infrared short wave broadband optical system - Google Patents
Visible light near-infrared short wave broadband optical system Download PDFInfo
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- CN114236782B CN114236782B CN202111363500.8A CN202111363500A CN114236782B CN 114236782 B CN114236782 B CN 114236782B CN 202111363500 A CN202111363500 A CN 202111363500A CN 114236782 B CN114236782 B CN 114236782B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 64
- 238000003384 imaging method Methods 0.000 claims abstract description 14
- 239000011521 glass Substances 0.000 claims abstract description 6
- 230000005499 meniscus Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 abstract description 4
- 238000011002 quantification Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000004075 alteration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000005357 flat glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 206010073261 Ovarian theca cell tumour Diseases 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 208000001644 thecoma Diseases 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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
- G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
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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
Abstract
The invention discloses a visible light near-infrared short-wave broadband optical system which adopts a straight-tube type primary imaging system configuration and comprises a first biconcave lens, a first biconvex lens, an optical filter, a second biconcave lens, a first cemented lens, a second biconvex lens and a second lens; the lenses are all composed of spherical glass and are arranged coaxially at intervals in sequence from the object side. The invention is a visible light near infrared short wave broadband optical system, the imaging wave band range is wide, and the wave band can be subdivided through a filter, so as to adapt to the application of different occasions; the optical machine is very convenient to install and adjust, the installation and adjustment difficulty of the system is reduced to a great extent, and the production quantification is facilitated.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to a broadband optical system.
Background
At present, airport runway lamps are gradually transited from halogen lamps to LED lamps, most of lighting systems of newly-built airports adopt LEDs, and therefore the EVS is required to be used in the daytime and can detect the LED capacity under the condition of low visibility, and fog and haze penetration is required under the condition of severe weather. In order to meet different use conditions and obtain sufficient and useful information, a broadband optical system needs to be developed to complete the detection of airport runway signs and light under different weather conditions.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a visible light near-infrared short-wave broadband optical system which adopts a straight-tube type primary imaging system structure and comprises a first biconcave lens, a first biconvex lens, an optical filter, a second biconcave lens, a first cemented lens, a second biconvex lens and a second lens; the lenses are all composed of spherical glass and are arranged coaxially at intervals in sequence from the object side. The invention is a visible light near-infrared short wave broadband optical system, the imaging wave band range is wide, and the wave band can be subdivided through an optical filter so as to adapt to the application of different occasions; the optical machine is very convenient to install and adjust, the installation and adjustment difficulty of the system is reduced to a great extent, and the production quantity is favorably realized.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a visible light near-infrared short-wave broadband optical system adopts a straight-tube type primary imaging system structure and comprises a first biconcave lens, a first biconvex lens, an optical filter, a second biconcave lens, a first cemented lens, a second biconvex lens and a second lens;
the first biconcave lens, the first biconvex lens, the optical filter, the second biconcave lens, the first cemented lens, the second biconvex lens and the second lens are sequentially arranged coaxially at intervals from the object side;
all the lenses are made of spherical glass;
the light rays sequentially enter the first biconcave lens, the first biconvex lens, the optical filter, the second biconcave lens, the first cemented lens, the second biconvex lens and the second lens, and finally form an image in the CCD.
Further, the first biconcave lens is a biconcave lens with negative optical power.
Further, the first lens is a meniscus lens having a positive power.
Further, the first biconvex lens is a biconvex lens with positive optical power.
Further, the optical filter is a non-optical filter.
Further, the second biconcave lens is a biconcave lens with negative optical power.
Further, the first cemented lens is a cemented lens having a positive optical power.
Further, the second cemented lens is a cemented lens having a negative optical power.
Further, the second biconvex lens is a biconvex lens with positive optical power.
Further, the second lens is a lens having a negative power.
The invention has the following beneficial effects:
the invention relates to a visible light near-infrared short wave broadband optical system, which has wide imaging waveband range and can subdivide wavebands through an optical filter so as to adapt to the application of different occasions. The spherical glass material is adopted for matching, so that the production and processing of the lens are facilitated; the whole optical system consists of six lenses, two cemented lenses and a group of optical filters, has a straight cylinder type configuration and a compact structure, and greatly reduces the requirements of the assembly process; the optical machine is very convenient to install and adjust, the installation and adjustment difficulty of the system is reduced to a great extent, and the production quantification is facilitated.
Drawings
FIG. 1 is an optical path diagram of an optical system of the present invention.
FIG. 2 is a graph showing MTF curves in a wide band of 0.4 to 1.7 μm in the example of the present invention.
FIG. 3 is a diagram showing a standard dot arrangement in a wide band of 0.4 to 1.7 μm in example of the present invention.
FIG. 4 is a distortion diagram in a wide wavelength band of 0.4 to 1.7 μm in the example of the present invention.
Fig. 5 shows an installation form of the optical filter according to the embodiment of the present invention.
In the figure, 1-a first biconcave lens, 2-a first lens, 3-a first biconvex lens, 4-a filter, 5-a second biconcave lens, 6-a first cemented lens, 7-a second cemented lens, 8-a second biconvex lens, 9-a second lens, 10-CCD, 11-0.4-1.7 μm transparent plate glass, 12-0.4-0.7 μm band-pass filter, 13-0.7-0.9 μm band-pass filter, 14-0.9-1.7 μm band-pass filter.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the drawings.
The purpose of the invention is: the visible light near-infrared short wave broadband optical system can be simultaneously applied to visible light near-infrared short wave broadband, and can also independently use visible light, near-infrared and short wave broadband so as to overcome the limitation of a single-waveband optical system in acquiring information.
As shown in fig. 1, a visible light near-infrared short-wave broadband optical system adopts a straight-tube type primary imaging system configuration, and includes a first biconcave lens, a first biconvex lens, an optical filter, a second biconcave lens, a first cemented mirror, a second biconvex lens, and a second lens;
the first biconcave lens, the first biconvex lens, the optical filter, the second biconcave lens, the first cemented lens, the second biconvex lens and the second lens are sequentially coaxially arranged at intervals from the object side;
all the lenses are made of spherical glass, so that the production and processing of the lenses are facilitated, the coma aberration, spherical aberration, astigmatism and other aberrations of the optical system are coordinated and corrected through the mutual matching of different materials, and the imaging quality is greatly improved;
the light rays sequentially enter the first biconcave lens, the first biconvex lens, the optical filter, the second biconcave lens, the first cemented lens, the second biconvex lens and the second lens, and finally form an image in the CCD.
Further, the first biconcave lens is a biconcave lens with negative optical power.
Further, the first lens is a meniscus lens having a positive power.
Further, the first biconvex lens is a biconvex lens with positive optical power.
Further, the optical filter is a filter without optical power.
Further, the second biconcave lens is a biconcave lens with negative optical power.
Further, the first cemented lens is a cemented lens having a positive optical power.
Further, the second cemented lens is a cemented lens having a negative optical power.
Further, the second biconvex lens is a biconvex lens having a positive optical power.
Further, the second lens is a lens having a negative power.
The specific embodiment is as follows:
the optical system of the embodiment adopts a straight-tube type primary imaging system configuration, and the whole optical system consists of six lenses, two cemented lenses and a group of optical filters. The system comprises the following components from the object side: a biconcave lens with negative focal power, a meniscus lens with positive focal power, a biconvex lens with positive focal power, a filter without focal power, a biconcave lens with negative focal power, a cemented lens with positive focal power, a cemented lens with negative focal power, a biconvex lens with positive focal power, a lens with negative focal power. Specific parameters of the optical system are shown in table 1.
TABLE 1 optical System data sheet
In order to adapt to broadband imaging, the detector is a 0.4-1.7 mu m broadband detector.
FIG. 2 is a graph showing MTF curves in a wide band of 0.4 to 1.7 μm;
as can be seen from FIG. 2, the MTF values of the optical system in the full field of view at 80lp/mm are all larger than 0.4, and the imaging effect is good.
FIG. 3 is a diagram of a standard dot arrangement in a wide band of 0.4 to 1.7 μm;
the dot-sequence diagram reflects the size of the root-mean-square scattered spot of the optical system, supplements the MTF of the optical system, and can be obtained from fig. 3, wherein the root-mean-square scattered spot of the optical system is smaller than 6 μm in a 0.9 field of view, the root-mean-square scattered spot of an edge field of view is smaller than 7 μm, and the imaging quality is good.
FIG. 4 is a diagram showing distortion in a wide wavelength band of 0.4 to 1.7 μm;
as can be seen from FIG. 4, the distortion of the whole field of view of the optical system is less than 1%, the distortion is small, and the imaging effect is not affected basically.
FIG. 5 shows one representation of a filter wheel incorporating filters according to the present invention. Plate glass with serial number 11 of 0.4-1.7 μm transmission; serial number 12 is a band-pass filter of 0.4-0.7 μm; a bandpass filter with serial number 13 of 0.7-0.9 μm; no. 14 is a 0.9 to 1.7 μm band pass filter. The shape of the filter can be round, square, ellipse, etc. The number of the filters can be increased or decreased according to actual needs.
Claims (1)
1. A visible light near-infrared short-wave broadband optical system is characterized in that a straight-tube type primary imaging system structure is adopted, and the optical system comprises a first biconcave lens, a first biconvex lens, an optical filter, a second biconcave lens, a first cemented lens, a second biconvex lens and a second lens;
the first biconcave lens, the first biconvex lens, the optical filter, the second biconcave lens, the first cemented lens, the second biconvex lens and the second lens are sequentially arranged coaxially at intervals from the object side;
all lenses are made of spherical glass;
the light rays sequentially enter the first biconcave lens, the first biconvex lens, the optical filter, the second biconcave lens, the first cemented lens, the second biconvex lens and the second lens and finally form an image in the CCD;
the first biconcave lens is a biconcave lens with negative focal power;
the first lens is a meniscus lens with a convex surface facing the image space and with positive focal power;
the first biconvex lens is a biconvex lens with positive focal power;
the optical filter is a filter without focal power;
the second biconcave lens is a biconcave lens with negative focal power;
the first cemented lens is a cemented lens with positive focal power and composed of a biconvex lens and a biconcave lens;
the second cemented lens is a cemented lens with negative focal power and composed of a biconvex lens and a biconcave lens;
the second biconvex lens is a biconvex lens with positive focal power;
the second lens is a meniscus lens with a convex surface facing the object space and negative focal power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111363500.8A CN114236782B (en) | 2021-11-17 | 2021-11-17 | Visible light near-infrared short wave broadband optical system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111363500.8A CN114236782B (en) | 2021-11-17 | 2021-11-17 | Visible light near-infrared short wave broadband optical system |
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| Publication Number | Publication Date |
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| CN114236782A CN114236782A (en) | 2022-03-25 |
| CN114236782B true CN114236782B (en) | 2023-04-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772960A (en) * | 2016-12-02 | 2017-05-31 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of passive athermal optical system of intermediate waves broadband |
| CN112666691A (en) * | 2020-12-22 | 2021-04-16 | 福建福光股份有限公司 | Medium-long-focus low-light-level lens with wide waveband and large image surface and imaging method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9207434B2 (en) * | 2014-02-25 | 2015-12-08 | Bae Systems Information And Electronic Systems Integration Inc. | Dual-band passively athermal optical lens system |
| JP2020170139A (en) * | 2019-04-05 | 2020-10-15 | 昭和オプトロニクス株式会社 | Short-wavelength infrared image capturing lens and image capturing device |
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2021
- 2021-11-17 CN CN202111363500.8A patent/CN114236782B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772960A (en) * | 2016-12-02 | 2017-05-31 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of passive athermal optical system of intermediate waves broadband |
| CN112666691A (en) * | 2020-12-22 | 2021-04-16 | 福建福光股份有限公司 | Medium-long-focus low-light-level lens with wide waveband and large image surface and imaging method thereof |
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| CN114236782A (en) | 2022-03-25 |
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