CN112162388B - Solar blind ultraviolet optical system with large relative aperture and large view field - Google Patents
Solar blind ultraviolet optical system with large relative aperture and large view field Download PDFInfo
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- CN112162388B CN112162388B CN202011209769.6A CN202011209769A CN112162388B CN 112162388 B CN112162388 B CN 112162388B CN 202011209769 A CN202011209769 A CN 202011209769A CN 112162388 B CN112162388 B CN 112162388B
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- lens
- optical system
- air space
- solar blind
- blind ultraviolet
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- 230000003287 optical effect Effects 0.000 title claims abstract description 40
- 230000005499 meniscus Effects 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 4
- 239000005350 fused silica glass Substances 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 6
- 230000003595 spectral effect Effects 0.000 abstract description 2
- 238000002834 transmittance Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000004075 alteration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002211 ultraviolet spectrum Methods 0.000 description 1
Images
Classifications
-
- 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
- G02B13/0045—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 five or more lenses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- 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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention relates to a solar blind ultraviolet optical system with large relative aperture and large field of view, which is suitable for the technical field of optical instruments and comprises a first lens, a second lens, a third lens, a filter group, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side at intervals along an optical axis; the first lens is a meniscus negative lens, the second lens is a double-concave negative lens, and the third lens is a double-convex positive lens; the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, the sixth lens is a plano-concave negative lens, and the seventh lens is a meniscus positive lens. The optical system is suitable for an energy detection system in the solar blind ultraviolet spectral region.
Description
Technical Field
The invention relates to a solar blind ultraviolet optical system with a large relative aperture and a large view field, which is suitable for the technical field of optical instruments.
Background
High-voltage power equipment of a power transmission line and a transformer substation mostly works in the atmospheric environment. Along with the reduction of the self insulation performance of the equipment or the increase of surface dirt and humidity, the power equipment can generate a corona discharge phenomenon. Corona discharge not only causes power loss of a line, but also enables air to generate chemical reaction to generate products such as ozone, nitrogen oxide and the like, and causes insulation corrosion and damage of a power transmission line and electrical equipment. Therefore, the position and the strength of the corona discharge can be timely and accurately detected, and the method has important significance for ensuring the reliable operation of a power system and reducing personal accidents and equipment damage.
The energy of corona discharge in a visible light wave band is very weak, and the observation is difficult. However, the corona discharge can emit light in a solar blind ultraviolet band (250-280 nm), and the ultraviolet light of 250-280 nm can be absorbed by an ozone layer when sunlight enters the atmosphere, so that a target in the solar blind ultraviolet band can be detected on the ground, background interference of the sunlight can be avoided even in a clear day, and the detection accuracy is extremely high.
Because the ultraviolet energy detection system belongs to weak light detection, the characteristics of large relative aperture, high transmittance and high image surface uniformity are required. In view of the fact that the number of commonly used ultraviolet band optical materials is small, fused quartz, calcium fluoride and magnesium fluoride are mainly used, and chromatic aberration of the system has a large influence on imaging performance of the system, most of the existing solar blind ultraviolet optical systems are difficult to have the characteristics of large relative aperture, high transmittance and high image plane uniformity.
Disclosure of Invention
The invention aims to provide a solar blind ultraviolet optical system with a large relative aperture and a large visual field, which is suitable for an energy detection system in a solar blind ultraviolet spectral region.
The technical scheme of the invention is as follows: a solar blind ultraviolet optical system with a large relative aperture and a large field of view comprises a first lens, a second lens, a third lens, a filter set, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged at intervals from an object side to an image side along an optical axis in sequence; the first lens is a meniscus negative lens, the second lens is a double-concave negative lens, and the third lens is a double-convex positive lens; the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, the sixth lens is a plano-concave negative lens, and the seventh lens is a meniscus positive lens.
Further, the air space between the first lens and the second lens is 14 mm-14.2 mm; the air space between the second lens and the third lens is 4.8 mm-5 mm; the air space between the third lens and the optical filter set is 1.8 mm-2.1 mm; the air space between the optical filter group and the fourth lens is 3.2 mm-3.5 mm; the air space between the fourth lens and the fifth lens is 0.05 mm-0.15 mm; the air space between the fifth lens and the sixth lens is 0.3 mm-0.5 mm; and the air space between the sixth lens and the seventh lens is 0.05 mm-0.15 mm.
Furthermore, the first lens, the second lens and the third lens form a front lens group with negative focal power; the fourth lens to the seventh lens form a rear lens group with positive focal power.
Further, in the front lens group, the focal lengths of the first lens, the second lens and the third lens are respectively f1、f2、 f3， f1、f2、f3Satisfies the following conditions: -95 < f1＜-105，-25＜f2＜-20，50＜f3＜55。
Further, in the rear lens group, focal lengths of a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element are respectively f4、f5、f6、f7， f4、f5、f6、f7Satisfies the following conditions: 40 < f4＜45，20＜f5＜25，-40＜f6＜-35，70＜f7＜80。
Furthermore, the first lens element to the seventh lens element are made of fused quartz or calcium fluoride, and have at least one aspheric surface.
Compared with the prior art, the invention has the following advantages:
a) large relative aperture, F number less than 1.3;
b) large field angle, 2w > 115 °;
c) high energy concentration, and the energy concentration in a full-field 0.18mm imaging circle is more than 80 percent;
d) high transmittance, the transmittance is more than 90 percent;
e) high image surface uniformity, and relative illumination more than 90%;
d) the target surface is large, and the imaging circle is larger than 17.5 mm;
f) the optical system has the advantages of high energy concentration, high transmittance, high image surface uniformity, large target surface and the like, and is suitable for an energy detection system in a solar blind ultraviolet spectrum region.
Drawings
FIG. 1 is a diagram of an optical system of the present invention;
FIG. 2 is an energy concentration diagram of the present invention;
FIG. 3 is a relative illuminance diagram according to the present invention;
in the figure: the optical lens comprises an A-front lens group, an A1-first lens, an A2-second lens, an A3-third lens, a B-filter group, a C-rear lens group, a C1-fourth lens, a C2-fifth lens, a C3-sixth lens and a C4-seventh lens.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Refer to fig. 1 to 3
A solar blind ultraviolet optical system with large relative aperture and large field of view comprises a first lens A1, a second lens A2, a third lens A3, a filter group B, a fourth lens C1, a fifth lens C2, a sixth lens C3 and a seventh lens C4 which are arranged at intervals from the object side to the image side along the optical axis; the first lens is a meniscus negative lens, the second lens is a double-concave negative lens, and the third lens is a double-convex positive lens; the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, the sixth lens is a plano-concave negative lens, and the seventh lens is a meniscus positive lens.
In this embodiment, the air space between the first lens and the second lens is 14mm to 14.2 mm; the air space between the second lens and the third lens is 4.8 mm-5 mm; the air space between the third lens and the optical filter set is 1.8 mm-2.1 mm; the air space between the optical filter group and the fourth lens is 3.2 mm-3.5 mm; the air space between the fourth lens and the fifth lens is 0.05 mm-0.15 mm; the air space between the fifth lens and the sixth lens is 0.3 mm-0.5 mm; and the air space between the sixth lens and the seventh lens is 0.05 mm-0.15 mm.
In this embodiment, the first lens element to the third lens element form a front lens group a with negative focal power; the fourth lens element to the seventh lens element form a rear lens group C having a positive focal power.
In this embodiment, in the front lens group, the focal lengths of the first lens element, the second lens element and the third lens element are respectively f1、f2、 f3， f1、f2、f3Satisfies the following conditions: -95 < f1＜-105，-25＜f2＜-20，50＜f3＜55。
In this embodiment, in the rear lens group, focal lengths of a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element are respectively f4、f5、f6、f7， f4、f5、f6、f7Satisfies the following conditions: 40 < f4＜45，20＜f5＜25，-40＜f6＜-35，70＜f7＜80。
In this embodiment, the first lens element to the seventh lens element are made of fused quartz or calcium fluoride, and have at least one aspheric surface.
The focal power of the optical system formed by the invention is reasonably distributed according to the proportion, and each lens is in a certain proportion relative to the focal length f of the system, so that the aberration of the optical system formed by the invention is reasonably corrected and balanced.
Specifically, the method comprises the following steps: the air space between the first lens and the second lens in the front lens group is 14.1mm, the air space between the second lens and the third lens is 4.9mm, the air space between the third lens and the optical filter group is 1.9mm, the air space between the optical filter group and the fourth lens in the rear lens group is 3.3mm, the air space between the fourth lens and the fifth lens is 0.1mm, the air space between the fifth lens and the sixth lens is 0.3mm, and the air space between the sixth lens and the seventh lens is 0.1 mm; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are spherical lenses, and the seventh lens is a single-sided aspheric lens.
The following table 1 lists the parameters of the optical lens assembly in the above embodiments:
table 1.
Table 2 below is the data relating to the aspheric surface of S15:
 |
 |
 |
 |
|
| aspherical surface S15 | -3.8306E-005 | 9.5125E-008 | -1.3153E-009 | 6.1596E-012 |
Table 2.
The aspheric expression is:
z represents a position in the optical axis direction, r represents a height in the vertical direction with respect to the optical axis, c represents a radius of curvature, k represents a conic coefficient,
、
、
、
representing aspheric coefficients. In aspherical data, E-n represents "
", e.g. 2.2722E-009 stands for
。
It will be apparent to those skilled in the art that various modifications, variations, substitutions and alterations can be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The solar blind ultraviolet optical system with large relative aperture and large field of view is characterized by comprising a first lens, a second lens, a third lens, a filter set, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side at intervals along an optical axis; the first lens is a meniscus negative lens, the second lens is a double-concave negative lens, and the third lens is a double-convex positive lens; the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, the sixth lens is a plano-concave negative lens, and the seventh lens is a meniscus positive lens; the F number of the optical system is less than 1.3; 2w > 115.
2. The solar blind ultraviolet optical system with large relative aperture and large field of view as claimed in claim 1, wherein the air space between the first lens and the second lens is 14mm to 14.2 mm; the air space between the second lens and the third lens is 4.8 mm-5 mm; the air space between the third lens and the optical filter set is 1.8 mm-2.1 mm; the air space between the optical filter group and the fourth lens is 3.2 mm-3.5 mm; the air space between the fourth lens and the fifth lens is 0.05 mm-0.15 mm; the air space between the fifth lens and the sixth lens is 0.3 mm-0.5 mm; and the air space between the sixth lens and the seventh lens is 0.05 mm-0.15 mm.
3. The solar blind ultraviolet optical system with large relative aperture and large field of view according to claim 1 or 2, wherein the first lens, the third lens and the fourth lens form a front lens group with negative optical power; and the fourth lens to the seventh lens form a rear lens group with positive focal power.
4. The solar blind ultraviolet optical system with large relative aperture and large field of view of claim 3, wherein the first lens, the second lens and the third lens in the front lens group have respective focal lengths f1、f2、 f3， f1、f2、f3Satisfies the following conditions: -95 < f1＜-105，-25＜f2＜-20，50＜f3＜55。
5. The solar blind ultraviolet optical system with large relative aperture and large field of view of claim 3, wherein the focal lengths of the fourth lens, the fifth lens, the sixth lens and the seventh lens in the rear lens group are respectively f4、f5、f6、f7， f4、f5、f6、f7Satisfies the following conditions: 40 < f4＜45，20＜f5＜25，-40＜f6＜-35，70＜f7＜80。
6. The solar blind ultraviolet optical system with large relative aperture and large visual field according to claim 1, wherein the first lens to the seventh lens are made of fused silica or calcium fluoride and have at least one aspheric surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011209769.6A CN112162388B (en) | 2020-11-03 | 2020-11-03 | Solar blind ultraviolet optical system with large relative aperture and large view field |
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| CN202011209769.6A CN112162388B (en) | 2020-11-03 | 2020-11-03 | Solar blind ultraviolet optical system with large relative aperture and large view field |
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| CN112162388A CN112162388A (en) | 2021-01-01 |
| CN112162388B true CN112162388B (en) | 2022-06-07 |
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| CN114185158B (en) * | 2021-12-07 | 2024-04-09 | 苏州东方克洛托光电技术有限公司 | Solar blind ultraviolet band imaging lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3397439B2 (en) * | 1994-04-21 | 2003-04-14 | 富士写真光機株式会社 | Imaging lens |
| JPH10170825A (en) * | 1996-12-13 | 1998-06-26 | Nikon Corp | Compact zoom lens |
| JP4503957B2 (en) * | 2003-08-28 | 2010-07-14 | オリンパス株式会社 | Three-group zoom lens and electronic imaging apparatus using the same |
| WO2011148822A1 (en) * | 2010-05-28 | 2011-12-01 | オリンパスメディカルシステムズ株式会社 | Image formation optical system and image pickup device |
| CN107450163B (en) * | 2017-09-25 | 2019-09-24 | 长春理工大学 | Big visual field folding, which spreads out, mixes day blind UV warming optical system |
| CN209070206U (en) * | 2018-11-16 | 2019-07-05 | 锦州航星光电设备有限公司 | A kind of big visual field UV warming lens optical system of object lens of large relative aperture |
| CN211826686U (en) * | 2019-12-18 | 2020-10-30 | 浙江天衡五维电子科技有限公司 | Ultra-wide-angle solar blind ultraviolet optical system |
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