CN114185158A - Solar blind ultraviolet band imaging lens - Google Patents
Solar blind ultraviolet band imaging lens Download PDFInfo
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- CN114185158A CN114185158A CN202111482633.7A CN202111482633A CN114185158A CN 114185158 A CN114185158 A CN 114185158A CN 202111482633 A CN202111482633 A CN 202111482633A CN 114185158 A CN114185158 A CN 114185158A
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- ultraviolet band
- blind ultraviolet
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- 238000003384 imaging method Methods 0.000 title claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 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 1
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 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
- 238000001228 spectrum Methods 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
- G02B13/143—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 positive meniscus lens, the second lens is a negative meniscus lens, the third lens is a double-concave negative lens, and the fourth lens is a double-convex positive lens. The invention can improve the relative aperture to 1:2 and realize small-angle incidence area, thereby ensuring the ideal incidence angle working condition of the optical filter and being beneficial to obtaining ultraviolet corona images 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 which works in a solar blind ultraviolet band and is used for corona detection.
Background
When corona discharge occurs in a high-voltage transmission line, an insulator is corroded for a long time, and power supply accidents may be caused, so that the corona condition needs to be detected regularly. The corona generation is accompanied with the generation of ultraviolet radiation, so the corona discharge position can be effectively found by an ultraviolet imaging means. In the solar blind ultraviolet band, namely the range of 240-280 nm band, the solar spectrum can not reach the earth surface in the band due to the strong absorption of ozone in the atmosphere, so that the imaging detection is carried out in the solar blind ultraviolet band, the interference of the background can be avoided, and the corona image with high contrast can be obtained. However, ultraviolet radiation generated by corona is usually weak, which requires adding a filter device in the imaging system to filter out light rays in other bands except the solar-blind ultraviolet band, so as to prevent the light rays from interfering with the solar-blind ultraviolet image of corona.
To increase the probability of corona detection, the relative aperture of the lens should be increased as much as possible to collect more energy. However, the increase of the relative aperture requires the increase of the incident angle of the light beam before the detector, which may cause the transmission wavelength range of the front filter of the detector to be expanded to the wavelength range beyond 240-280 nm, and the filter device will not work normally. Due to the limitation, the relative aperture of the ultraviolet corona imaging lens is 1: 3-1: 4.
The invention content is as follows:
the invention aims to provide a large-relative-aperture solar-blind ultraviolet band imaging lens, which can provide a small-angle incidence area for an optical filter in the lens while increasing the relative aperture.
In order to solve the technical problem, the solar-blind ultraviolet band imaging lens comprises an optical filter and an imaging lens group which are sequentially arranged along an optical axis; it is characterized in that an afocal lens group is 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 positive meniscus lens, the second lens is a negative meniscus lens, the third lens is a double-concave negative lens, and the fourth lens is a double-convex 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 materials.
The curvature radius of each lens, the thickness of each lens and the interval between adjacent lenses of the afocal lens group are shown in the following table, wherein R in the tableiDenotes the radius of curvature, t, of the ith optical surfacejDenotes the thickness of the j-th lens, dnRepresents the air space from the back surface of the nth lens to the front surface of the next lens;
the imaging lens group consists of a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged along an 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 materials.
The curvature radius of each lens optical surface, the thickness of each lens and the interval between adjacent lenses of the imaging lens group are shown in the following table, wherein R in the tableiRepresents a radius of curvature of the ith optical surface; t is tjDenotes the thickness of the j-th lens, dnDenotes the air space from the back surface of the nth lens to the front surface of the next lens, D8Represents the distance from the rear surface of the eighth lens 8 to the detector image plane:
advantageous effects
The invention provides a solar blind ultraviolet band imaging lens with large relative aperture, wherein a light filter is inserted between a front lens group and a rear lens group, and the incident angle range is less than +/-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, and utilizes the angle compression effect of the afocal front group, so that the relative aperture can be improved to 1:2, and simultaneously, a small-angle incidence area is realized, the ideal incidence angle working condition of the optical filter is ensured, and the ultraviolet corona image with high signal-to-noise ratio is obtained.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural view of embodiment 1 of the present invention.
FIG. 2 is an image forming dot array diagram of embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 4 is an image point array diagram of embodiment 2 of the present invention.
Fig. 5 is a schematic structural diagram of embodiment 3 of the present invention.
Fig. 6 is an image point array diagram of embodiment 3 of the present invention.
In the figure, 1 is a first lens, 2 is a second lens, 3 is a third lens, 4 is a fourth lens, 5 is a fifth lens, 6 is a sixth lens, 7 is a seventh lens, 8 is an eighth lens, 9 is a filter, and I is an image plane.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
As shown in fig. 1, 3 and 5, the solar-blind ultraviolet band imaging lens of the present invention has 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 sequentially disposed on an optical axis; 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 positive meniscus lens, the second lens is a negative meniscus lens, and the third lens is a negative biconcave 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. By the material combination, the afocal lens group and the imaging lens group can respectively correct axial chromatic aberration, and the two groups of lenses are combined to correct 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, wherein RiDenotes the radius of curvature of the ith optical surface, i ═ 1,2, …, 16; t is tjDenotes the thickness of the j-th lens, j ═ 1,2, …, 8; dnDenotes the air space from the back surface of the nth lens to the front surface of the next lens, n being 1,2, …,7, D8Represents the distance from the rear surface of the eighth lens 8 to the detector image plane:
TABLE 1
The first group of lenses is an afocal lens group, light rays of each field of view are still parallel light beams in each direction after being emitted from the lens group, and the angular magnification ratio of the first group of lenses is 0.6; the second group of lenses is an imaging lens group, and the focal length of the second group of lenses is 83.3 mm.
The relative aperture of the embodiment can reach 1:2, the incident angle range of the optical filter is < + > 4 degrees, and the arrangement chart of imaging points under the central view field, the 3 degree view field, the 5 degree view field and the 7 degree view field is shown in figure 2. As can be seen from the figure, the root-mean-square diameter of the geometric imaging light spot of the lens under each field of view is less 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 RiDenotes the radius of curvature of the ith optical surface, i ═ 1,2, …, 16; t is tjRepresenting the j-th lensThickness, j ═ 1,2, …, 8; dnDenotes the air space from the back surface of the nth lens to the front surface of the next lens, n being 1,2, …,7, D8Represents the distance from 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 incident angle range of the optical filter is < + > -4.2 degrees, and the imaging point lists under the central view field, the 3 degree view field, the 5 degree view field and the 7 degree view field are shown in FIG. 4. As can be seen from the figure, the root-mean-square diameters of the geometric imaging light spots of the lens under the central field of view, the 3 degree, the 5 degree and the 7 degree field of view are all less than 0.1mm, 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 thickness of the lenses and the spacing between adjacent lenses are shown in Table 3, where RiDenotes the radius of curvature of the ith optical surface, i ═ 1,2, …, 16; t is tjDenotes the thickness of the j-th lens, j ═ 1,2, …, 8; dnDenotes the air space from the back surface of the nth lens to the front surface of the next lens, n being 1,2, …,7, D8Represents the distance from the rear surface of the eighth lens 8 to the detector image plane:
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 an imaging point list under the central view field, the 3 degree view field, the 5 degree view field and the 7 degree view field is shown in FIG. 6. As can be seen from the figure, the root-mean-square diameters of the geometric imaging light spots of the lens under the central field of view, the 3 degree, the 5 degree and the 7 degree field of view are all less than 0.1mm, and the image quality requirement of corona detection can be met.
Claims (6)
1. A 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 positive meniscus lens, the second lens is a negative meniscus lens, the third lens is a double-concave negative lens, and the fourth lens is a double-convex positive lens.
2. The solar-blind ultraviolet band imaging lens as claimed in claim 1, wherein the first lens, the second lens and the fourth lens are made of calcium fluoride material; the third lens is made of quartz materials.
3. The solar-blind ultraviolet band imaging lens according to claim 1 or 2, wherein the curvature radius of each lens, the thickness of each lens and the interval between adjacent lenses in the afocal lens group are as follows, wherein R is shown in the tableiDenotes the radius of curvature, t, of the ith optical surfacejDenotes the thickness of the j-th lens, dnRepresents the air space from the back surface of the nth lens to the front surface of the next lens;
4. the solar-blind ultraviolet band imaging lens according to claim 1, wherein the imaging lens group comprises a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged along an 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.
5. The solar-blind ultraviolet band imaging lens as claimed in claim 1, wherein the fifth lens, the seventh lens and the eighth lens are made of calcium fluoride material; the sixth lens is made of quartz materials.
6. The solar-blind ultraviolet band imaging lens as claimed in claim 4 or 5, wherein the radius of curvature of the optical surface of each lens, the thickness of the lens and the interval between adjacent lenses in the imaging lens group are as follows, wherein R is as shown in the tableiRepresents a radius of curvature of the ith optical surface; t is tjDenotes the thickness of the j-th lens, dnDenotes the air space from the back surface of the nth lens to the front surface of the next lens, D8And the distance from the rear surface of the eighth lens to the image surface of the detector is represented as follows:
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 |
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| 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 true CN114185158A (en) | 2022-03-15 |
| CN114185158B 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924388A (en) * | 2022-06-02 | 2022-08-19 | 浙江舜宇光学有限公司 | Optical imaging system |
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|---|---|---|---|---|
| US20030011893A1 (en) * | 2001-06-20 | 2003-01-16 | Nikon Corporation | Optical system and exposure apparatus equipped with the optical system |
| 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 |
-
2021
- 2021-12-07 CN CN202111482633.7A patent/CN114185158B/en active Active
Patent Citations (8)
| 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 |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924388A (en) * | 2022-06-02 | 2022-08-19 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN114924388B (en) * | 2022-06-02 | 2023-06-09 | 浙江舜宇光学有限公司 | Optical imaging system |
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| CN114185158B (en) | 2024-04-09 |
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