CN114185158B - Solar blind ultraviolet band imaging lens - Google Patents
Solar blind ultraviolet band imaging lens Download PDFInfo
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- CN114185158B CN114185158B CN202111482633.7A CN202111482633A CN114185158B CN 114185158 B CN114185158 B CN 114185158B CN 202111482633 A CN202111482633 A CN 202111482633A CN 114185158 B CN114185158 B CN 114185158B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 32
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 230000005499 meniscus Effects 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 11
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 5
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000004075 alteration Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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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
- G02B13/143—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation for use with ultraviolet radiation
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to a solar blind ultraviolet band imaging lens, which comprises an optical filter and an imaging lens group which are sequentially arranged along an optical axis; an afocal lens group is also arranged on the optical axis in front of the optical filter; the afocal lens group consists of a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along an optical axis; the first lens is a meniscus positive lens, the second lens is a meniscus negative lens, the third lens is a biconcave negative lens, and the fourth lens is a biconvex positive lens. The invention can improve the relative aperture to 1:2 and realize a small angle incidence area, ensures the ideal incidence angle working condition of the optical filter, and is beneficial to obtaining an ultraviolet corona image with high signal-to-noise ratio.
Description
Technical Field
The invention belongs to the technical field of lenses, and relates to a large-relative-aperture lens working in a solar blind ultraviolet band and used for corona detection.
Background
When corona discharge occurs in a high-voltage transmission line, the insulator can be corroded for a long time, and power supply accidents can be possibly caused, so that the corona condition needs to be detected regularly. The corona is generated along with ultraviolet radiation, so that the position of the corona discharge can be effectively found through ultraviolet imaging means. In the range of the solar blind ultraviolet band, namely 240-280 nm band, due to strong absorption of ozone in the atmosphere, the solar spectrum cannot reach the ground surface in the band, so that the interference of the background can be avoided by implementing imaging detection in the solar blind ultraviolet band, and a corona image with high contrast is obtained. However, the ultraviolet radiation generated by the corona is generally weak, and a filter device needs to be added in the imaging system to filter out light rays in other wave bands except the solar blind ultraviolet wave band so as to prevent the light rays from interfering with the solar blind ultraviolet image of the corona.
In order to increase the probability of detection of corona, the relative aperture of the lens should be increased as much as possible to collect more energy. However, the increase in the relative aperture requires an increase in the angle of incidence of the front beam of the detector, which is highly likely to result in an expansion of the transmission band range of the front filter of the detector to a band other than 240-280 nm, and the filter will not function properly. Because of this limitation, the relative aperture of a typical ultraviolet corona imaging lens is in the range of 1:3 to 1:4.
The invention comprises the following steps:
the invention aims to provide a solar blind ultraviolet band imaging lens with a large relative aperture, wherein the lens can provide a small-angle incident area for an optical filter while the relative aperture is increased.
In order to solve the technical problems, the solar blind ultraviolet band imaging lens comprises an optical filter and an imaging lens group which are sequentially arranged along an optical axis; the optical filter is characterized in that an afocal lens group is also arranged on the optical axis in front of the optical filter; the afocal lens group consists of a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along an optical axis; the first lens is a meniscus positive lens, the second lens is a meniscus negative lens, the third lens is a biconcave negative lens, and the fourth lens is a biconvex positive lens.
The first lens, the second lens and the fourth lens are made of calcium fluoride materials; the third lens is made of quartz material.
The curvature radius, the thickness and the interval between adjacent lenses of each lens of the afocal lens group are shown in the following table, R in the table i Representing the radius of curvature, t, of the ith optical surface j Represents the thickness of the jth lens, d n Representing the air separation from the nth lens rear surface to the next lens front surface;
the imaging lens group consists of a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged along the optical axis; the fifth lens is a biconvex positive lens, the sixth lens is a biconcave negative lens, the seventh lens is a biconvex positive lens, and the eighth lens is a meniscus positive lens.
The fifth lens, the seventh lens and the eighth lens are made of calcium fluoride materials; the sixth lens is made of quartz material.
The curvature radius of the optical surface of each lens of the imaging lens group, the thickness of the lens and the interval between adjacent lenses are shown in the following table, R in the table i Representing the radius of curvature of the ith optical surface; t is t j Represents the thickness of the jth lens, d n Represents the air gap from the rear surface of the nth lens to the front surface of the next lens, D 8 Representing the distance of the rear surface of the eighth lens 8 to the detector image plane:
advantageous effects
The invention provides a large relative aperture solar blind ultraviolet band imaging lens, wherein a filter device is inserted between a front lens group and a rear lens group, and the incident angle range is < +/-4 degrees. The relative aperture of the lens can reach 1:2, and the image quality requirement of corona detection can be met.
The invention adopts two groups of lenses, utilizes the angle compression effect of the afocal front group, can improve the relative aperture to 1:2, simultaneously realize a small angle incidence area, ensures the ideal incidence angle working condition of the optical filter, and is beneficial to obtaining the ultraviolet corona image with high signal to noise ratio.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
Fig. 1 is a schematic structural view of embodiment 1 of the present invention.
Fig. 2 is a column diagram of imaging points of embodiment 1 of the present invention.
Fig. 3 is a schematic structural view of embodiment 2 of the present invention.
Fig. 4 is a column diagram of imaging points of embodiment 2 of the present invention.
Fig. 5 is a schematic structural view of embodiment 3 of the present invention.
Fig. 6 is a column diagram of imaging points of embodiment 3 of the present invention.
In the figure, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, an optical filter and an image plane are shown as 1,2, 3, 4, 5, 6, 7, 8, 9.
Detailed Description
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
As shown in fig. 1, 3 and 5, the solar blind ultraviolet band imaging lens of the present invention is sequentially provided with a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, an optical filter 9 and an image plane I on an optical axis; wherein the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are combined into an afocal lens group; the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 are combined into an imaging lens group; the first lens is a meniscus positive lens, the second lens is a meniscus negative lens, and the third lens is a biconcave negative lens; the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, the sixth lens is a biconcave negative lens, the seventh lens is a biconvex positive lens, and the eighth lens is a meniscus positive lens.
The first lens 1, the second lens 2, the fourth lens 4, the fifth lens 5, the seventh lens 7 and the eighth lens 8 are made of calcium fluoride materials; the third lens 3 and the sixth lens 6 are made of quartz materials. Through the material combination, the afocal lens group and the imaging lens group respectively correct the axial chromatic aberration, and the two lens groups respectively correct the vertical chromatic aberration.
Example 1
The radii of curvature of the optical surfaces of the eight lenses, the thicknesses of the lenses, and the spacing between adjacent lenses are shown in Table 1, where R i Represents the radius of curvature of the i-th optical surface, i=1, 2, …,16; t is t j Represents the thickness of the j-th lens, j=1, 2, …,8; d, d n Represents the air spacing of the nth lens rear surface to the next lens front surface, n=1, 2, …,7,D 8 Indicating the rear surface of the eighth lens 8 to the probeDistance of image plane:
TABLE 1
The first group of lenses are afocal lens groups, light rays of each view field still form parallel light beams in all directions after exiting from the lens groups, and the angle magnification ratio is 0.6; the second group of lenses is an imaging lens group, and the focal length of the second group of lenses is 83.3mm.
The relative aperture of the embodiment can reach 1:2, the incidence angle range of the optical filter is < +/-4 degrees, and the imaging point column diagram under the central view field, 3 degrees, 5 degrees and 7 degrees view field is shown in fig. 2. As can be seen from the figure, the root mean square diameter of the geometric imaging light spots of the lens under each view field is smaller than 0.1mm, and the image quality requirement of corona detection can be met.
Example 2
The radii of curvature of the optical surfaces of the eight lenses, the thicknesses of the lenses, and the spacing between adjacent lenses are shown in Table 2, where R i Represents the radius of curvature of the i-th optical surface, i=1, 2, …,16; t is t j Represents the thickness of the j-th lens, j=1, 2, …,8; d, d n Represents the air spacing of the nth lens rear surface to the next lens front surface, n=1, 2, …,7,D 8 Representing the distance of the rear surface of the eighth lens 8 to the detector image plane:
TABLE 2
The relative aperture of the embodiment can reach 1:1.8, the incidence angle range of the optical filter is < +/-4.2 degrees, and the imaging point column diagram under the central view field, 3 degrees, 5 degrees and 7 degrees view fields is shown in fig. 4. From the graph, the root mean square diameter of the geometric imaging light spot of the lens is smaller than 0.1mm under the central view field, the 3 degree view field, the 5 degree view field and the 7 degree view field, and the image quality requirement of corona detection can be met.
Example 3
The radii of curvature of the optical surfaces of the eight lenses, the thicknesses of the lenses, and the spacing between adjacent lenses are shown in Table 3, where R i Represents the radius of curvature of the i-th optical surface, i=1, 2, …,16; t is t j Represents the thickness of the j-th lens, j=1, 2, …,8; d, d n Represents the air spacing of the nth lens rear surface to the next lens front surface, n=1, 2, …,7,D 8 Representing the distance of the rear surface of the eighth lens 8 to the detector image plane:
TABLE 3 Table 3
The relative aperture of the embodiment can reach 1:1.8, the incidence angle range of the optical filter is < +/-4 degrees, and the imaging point column diagram under the central view field, 3 degrees, 5 degrees and 7 degrees view fields is shown in fig. 6. From the graph, the root mean square diameter of the geometric imaging light spot of the lens is smaller than 0.1mm under the central view field, the 3 degree view field, the 5 degree view field and the 7 degree view field, and the image quality requirement of corona detection can be met.
Claims (3)
1. The solar blind ultraviolet band imaging lens comprises an optical filter and an imaging lens group which are sequentially arranged along an optical axis; the optical filter is characterized in that an afocal lens group is also arranged on the optical axis in front of the optical filter; the afocal lens group consists of a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along an optical axis; the first lens is a meniscus positive lens, the second lens is a meniscus negative lens, the third lens is a biconcave negative lens, and the fourth lens is a biconvex positive lens; the first lens, the second lens and the fourth lens are made of calcium fluoride materials; the third lens is made of quartz material; the imaging lens group consists of a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged along the optical axis; the fifth lens is a biconvex positive lens, the sixth lens is a biconcave negative lens, the seventh lens is a biconvex positive lens, and the eighth lens is a meniscus positive lens; the fifth lens, the seventh lens and the eighth lens are made of calcium fluoride materials; the sixth lens is made of quartz material; the radius of curvature of the front surface and the back surface of the first lens is-31 mm to-30 mm and-35 mm to-33 mm respectively; the radius of curvature of the front surface and the rear surface of the second lens is 65 mm-66 mm and 28 mm-30 mm respectively; the radius of curvature of the front surface and the rear surface of the third lens are respectively minus 267mm to minus 266mm and 43mm to 45mm; the curvature radius of the front surface and the back surface of the fourth lens is respectively 43 mm-45 mm, -54 mm-52 mm; the front and back surfaces of the fifth lens have the curvature radiuses of 417 mm-419 mm, -36 mm-34 mm respectively; the radius of curvature of the front surface and the rear surface of the sixth lens is-36 mm to-34 mm and 41mm to 43mm respectively; the radius of curvature of the front surface and the rear surface of the seventh lens are respectively 43 mm-44 mm, -53 mm-52 mm; the radius of curvature of the front and rear surfaces of the eighth lens is 63 mm-64 mm, 134 mm-136 mm, respectively.
2. The solar blind ultraviolet band imaging lens as claimed in claim 1, wherein the thickness of the first lens is 20 mm-21 mm, and the air interval from the rear surface to the front surface of the second lens is 0.77 mm-0.79 mm; the thickness of the second lens is 5 mm-6 mm, and the air interval from the rear surface to the front surface of the third lens is 28 mm-29 mm; the thickness of the third lens is 10 mm-11 mm, and the air interval from the rear surface to the front surface of the fourth lens is 0.5 mm-0.6 mm; the thickness of the fourth lens is 14 mm-16 mm, and the air interval from the rear surface to the front surface of the fifth lens is 34 mm-36 mm.
3. The solar blind ultraviolet band imaging lens as claimed in claim 1, wherein the thickness of the fifth lens is 13.5 mm-14.5 mm, and the air interval from the rear surface to the front surface of the sixth lens is 0.50 mm-0.52 mm; the thickness of the sixth lens is 4.5 mm-5.5 mm, and the air interval from the rear surface to the front surface of the seventh lens is 0.63 mm-0.65 mm; the thickness of the seventh lens is 19 mm-21 mm, and the air interval from the rear surface to the front surface of the eighth lens is 0.5 mm-0.6 mm; the thickness of the eighth lens is 8.5 mm-9.5 mm, and the distance from the rear surface to the image surface of the detector is 70 mm-72 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111482633.7A CN114185158B (en) | 2021-12-07 | 2021-12-07 | Solar blind ultraviolet band imaging lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111482633.7A CN114185158B (en) | 2021-12-07 | 2021-12-07 | Solar blind ultraviolet band imaging lens |
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| Publication Number | Publication Date |
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| CN114185158A CN114185158A (en) | 2022-03-15 |
| CN114185158B true CN114185158B (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111482633.7A Active CN114185158B (en) | 2021-12-07 | 2021-12-07 | Solar blind ultraviolet band imaging lens |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114924388B (en) * | 2022-06-02 | 2023-06-09 | 浙江舜宇光学有限公司 | Optical imaging system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777316A (en) * | 2012-10-18 | 2014-05-07 | 常州光电技术研究所 | UV object lens |
| CN104808315A (en) * | 2015-05-22 | 2015-07-29 | 福建浩蓝光电有限公司 | High-image-quality and low-distortion machine vision ultraviolet lens |
| CN206618895U (en) * | 2017-04-18 | 2017-11-07 | 福建师范大学 | A kind of big target surface bi-focal lens optical system of day blind ultraviolet band |
| CN108681035A (en) * | 2018-06-07 | 2018-10-19 | 嘉兴中润光学科技有限公司 | Super large aperture tight shot |
| CN109581634A (en) * | 2019-01-07 | 2019-04-05 | 广东弘景光电科技股份有限公司 | High-pixel wide-angle day and night confocal optical system and its camera module of application |
| CN111061047A (en) * | 2020-02-19 | 2020-04-24 | 南京信息工程大学 | Solar blind ultraviolet lens with large relative aperture and long focal length and optical system |
| CN112162388A (en) * | 2020-11-03 | 2021-01-01 | 福建福光股份有限公司 | Solar blind ultraviolet optical system with large relative aperture and large view field |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030011893A1 (en) * | 2001-06-20 | 2003-01-16 | Nikon Corporation | Optical system and exposure apparatus equipped with the optical system |
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2021
- 2021-12-07 CN CN202111482633.7A patent/CN114185158B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777316A (en) * | 2012-10-18 | 2014-05-07 | 常州光电技术研究所 | UV object lens |
| CN104808315A (en) * | 2015-05-22 | 2015-07-29 | 福建浩蓝光电有限公司 | High-image-quality and low-distortion machine vision ultraviolet lens |
| CN206618895U (en) * | 2017-04-18 | 2017-11-07 | 福建师范大学 | A kind of big target surface bi-focal lens optical system of day blind ultraviolet band |
| CN108681035A (en) * | 2018-06-07 | 2018-10-19 | 嘉兴中润光学科技有限公司 | Super large aperture tight shot |
| CN109581634A (en) * | 2019-01-07 | 2019-04-05 | 广东弘景光电科技股份有限公司 | High-pixel wide-angle day and night confocal optical system and its camera module of application |
| CN111061047A (en) * | 2020-02-19 | 2020-04-24 | 南京信息工程大学 | Solar blind ultraviolet lens with large relative aperture and long focal length and optical system |
| CN112162388A (en) * | 2020-11-03 | 2021-01-01 | 福建福光股份有限公司 | Solar blind ultraviolet optical system with large relative aperture and large view field |
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| CN114185158A (en) | 2022-03-15 |
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