CN118091898B - Solar blind ultraviolet lens - Google Patents
Solar blind ultraviolet lens Download PDFInfo
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- CN118091898B CN118091898B CN202410472123.9A CN202410472123A CN118091898B CN 118091898 B CN118091898 B CN 118091898B CN 202410472123 A CN202410472123 A CN 202410472123A CN 118091898 B CN118091898 B CN 118091898B
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- 230000003287 optical effect Effects 0.000 claims abstract description 44
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 24
- 239000010453 quartz Substances 0.000 claims abstract description 20
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 8
- 239000005350 fused silica glass Substances 0.000 claims abstract description 8
- 238000003384 imaging method Methods 0.000 claims description 19
- 238000002834 transmittance Methods 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 34
- 230000005540 biological transmission Effects 0.000 abstract description 21
- 238000005516 engineering process Methods 0.000 description 13
- 230000035945 sensitivity Effects 0.000 description 10
- 208000028659 discharge Diseases 0.000 description 7
- 230000004075 alteration Effects 0.000 description 6
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- 229920002873 Polyethylenimine Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 238000007796 conventional method Methods 0.000 description 2
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- 238000001931 thermography Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 238000000233 ultraviolet lithography 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
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Photovoltaic Devices (AREA)
Abstract
The application relates to a solar blind ultraviolet lens. The solar blind optical filter comprises a lens group, a solar blind optical filter group and a cathode quartz optical window; the lens group comprises a plurality of spherical lenses; one part of each spherical lens is made of calcium fluoride material, and the other part of each spherical lens is made of fused quartz material; the solar blind filter set comprises a plurality of solar blind filters; each spherical lens, each solar blind filter and the cathode quartz light window are sequentially arranged from the object side to the image side. The device can be arranged on an unmanned aerial vehicle for inspecting high-voltage transmission equipment, so that non-contact automatic detection of the high-voltage transmission equipment is realized, and the detection accuracy of the high-voltage transmission equipment is improved.
Description
Technical Field
The application relates to the technical field of optical elements, in particular to a solar blind ultraviolet lens.
Background
With the continuous development of optical element technology, the solar blind ultraviolet lens plays a vital role in the defect detection of high-voltage transmission equipment. The solar blind ultraviolet imaging technology has the advantages of no interference of sunlight, ultrahigh sensitivity, accurate identification and the like, can discover a leakage power supply at the first time, discover and control the hazard in the early stage, and has great significance for safe transportation of a power grid.
In the traditional technology, the defects of the high-voltage power transmission equipment are generally detected by manually holding a solar blind ultraviolet lens, and the detection result depends on personal experience, so that the defects of the high-voltage power transmission equipment are detected inaccurately by adopting the traditional technology.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a solar blind ultraviolet lens capable of improving the detection accuracy of high-voltage power transmission equipment.
The application provides a solar blind ultraviolet lens which comprises a lens group, a solar blind optical filter group and a cathode quartz optical window, wherein the lens group is arranged on the solar blind optical filter group;
the lens group is composed of a plurality of spherical lenses; one part of each spherical lens is made of calcium fluoride material, and the other part of each spherical lens is made of fused quartz material;
the solar blind filter set consists of a plurality of solar blind filters;
each spherical lens, each solar blind filter and each cathode quartz optical window are sequentially arranged from the object side to the image side.
In one embodiment, at least a part of each spherical lens forms a lens structure with alternately arranged positive and negative lenses.
In one embodiment, the lens group is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; the first, third and fourth lenses are positive lenses, and the second, fifth and sixth lenses are negative lenses.
In one embodiment, the length of the solar blind ultraviolet lens is less than or equal to 42mm.
In one embodiment, the weight of the solar blind ultraviolet lens is less than or equal to 14.6g.
In one embodiment, the f-number of the solar blind ultraviolet lens is 1.8, the full field angle of the solar blind ultraviolet lens is 20 degrees, and the image facing angle line size of the solar blind ultraviolet lens is 10mm.
In one embodiment, with the object side as the front and the image side as the rear, the front surface radius of the first lens is 16.576mm, and the rear surface radius of the first lens is 150.551mm; the radius of the front surface of the second lens is-55.886 mm, and the radius of the rear surface of the second lens is 11.741mm; the radius of the front surface of the third lens is 19.139mm, and the radius of the rear surface of the third lens is-29.923 mm; the front surface radius of the fourth lens is 12.872mm, and the rear surface radius of the fourth lens is 151.663mm; the radius of the front surface of the fifth lens is-17.353 mm, and the radius of the rear surface of the fifth lens is-14.011 mm; the front surface radius of the sixth lens is 12.409mm, and the rear surface radius of the sixth lens is 7.020mm.
In one embodiment, a diaphragm is arranged between the third lens and the fourth lens; a center-to-center distance between a front surface of the first lens and a rear surface of the first lens is 2.759mm, and a center-to-center distance between a rear surface of the first lens and a front surface of the second lens is 1.109mm; a center-to-center distance between a front surface of the second lens and a rear surface of the second lens is 1.210mm, and a center-to-center distance between a rear surface of the second lens and a front surface of the third lens is 1.073mm; a center distance between the front surface of the third lens and the rear surface of the third lens is 3.044mm, and a center distance between the rear surface of the third lens and the diaphragm is 0.100mm; the center distance between the diaphragm and the front surface of the fourth lens is 0.100mm; a center-to-center distance between a front surface of the fourth lens and a rear surface of the fourth lens is 3.058mm, and a center-to-center distance between a rear surface of the fourth lens and a front surface of the fifth lens is 1.903mm; a center-to-center distance between a front surface of the fifth lens and a rear surface of the fifth lens is 2.063mm, and a center-to-center distance between a rear surface of the fifth lens and a front surface of the sixth lens is 0.1mm; the center distance between the front surface of the sixth lens and the rear surface of the sixth lens is 2.077mm, and the center distance between the rear surface of the sixth lens and the front surface of the solar blind filter set is 2.578mm.
In one embodiment, the solar blind filter set is used for filtering background interference outside an ultraviolet signal band; the minimum peak wavelength of the solar blind filter set is 261nm, and the maximum peak wavelength of the solar blind filter set is 267nm; the peak transmittance of the solar blind filter set is greater than or equal to 30%; the bandwidth of the solar blind filter set is larger than or equal to 17nm; the length of the solar blind filter set is smaller than or equal to 16mm.
In one embodiment, the effective diameter of the photosurface cathode of the solar blind ultraviolet lens is 10mm.
The solar blind ultraviolet lens comprises a lens group, a solar blind optical filter group and a cathode quartz optical window; the lens group comprises a plurality of spherical lenses; one part of each spherical lens is made of calcium fluoride material, and the other part of each spherical lens is made of fused quartz material; the solar blind filter set comprises a plurality of solar blind filters; each spherical lens, each solar blind filter and the cathode quartz light window are sequentially arranged from the object side to the image side. Because the quality of the materials is small, the solar blind ultraviolet lens manufactured by the materials has the characteristic of light weight, and can be installed on an unmanned aerial vehicle for inspecting high-voltage power transmission equipment, so that non-contact automatic detection of the high-voltage power transmission equipment is realized, and the detection accuracy of the high-voltage power transmission equipment is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of a solar blind ultraviolet lens according to an embodiment;
FIG. 2 is a point diagram of a lightweight solar blind ultraviolet lens optical system in one embodiment;
FIG. 3 is a field curvature diagram of a lightweight solar blind ultraviolet lens optical system in one embodiment;
fig. 4 is a graph of MTF (Modulation Transfer Function ) of a lightweight solar blind ultraviolet lens optical system in one embodiment.
Reference numerals illustrate: 1-a first lens, 2-a second lens, 3-a third lens, 4-a fourth lens, 5-a fifth lens, 6-a sixth lens, 7-a first solar blind filter, 8-a second solar blind filter, 9-a third solar blind filter, 10-a fourth solar blind filter and 11-a cathode quartz optical window.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.
Spatially relative terms, such as "under", "below", "beneath", "under", "above", "over" and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below" and "under" may include both an upper and a lower orientation. Furthermore, the device may also include an additional orientation (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
As described in the background art, in the prior art, defects of high-voltage power transmission equipment are generally detected by manually holding a solar blind ultraviolet lens, the detection result depends on personal experience, and false detection or missing detection is easy to occur in the manual detection process, so that the defect of the high-voltage power transmission equipment is detected inaccurately by adopting the traditional technology. Based on the reasons, the invention provides the solar blind ultraviolet lens capable of improving the detection accuracy of high-voltage power transmission equipment.
In one embodiment, a solar blind ultraviolet lens is provided, comprising a lens group, a solar blind filter group and a cathode quartz optical window; the lens group is composed of a plurality of spherical lenses; one part of each spherical lens is made of calcium fluoride material, and the other part of each spherical lens is made of fused quartz material; the solar blind filter set comprises a plurality of solar blind filters; each spherical lens, each solar blind filter and the cathode quartz light window are sequentially arranged from the object side to the image side.
Wherein the lens is an optical element made of a material that is transparent to a specified spectrum. The lens group is a lens group including at least one lens. The object side refers to the side where the object is located, the image side refers to the side where the imaging party is located, and the light from the object side can be imaged on the image side. The "spherical curvature" of a spherical lens is constant, i.e. the surfaces in front of and behind the lens are each part of a spherical surface. The calcium fluoride material has high refractive index and is widely used in ultraviolet lithography, astronomical observation, aerial survey, reconnaissance and high-resolution optical instruments. The solar blind filter is a core device of the solar blind ultraviolet lens and is used for filtering interference of radiation in other spectral ranges in the detection environment, so that the solar blind ultraviolet lens can better detect solar blind ultraviolet radiation. The fused quartz material has high refractive index, high light transmittance and good physical and chemical properties. The cathode quartz optical window has the characteristics of high transmittance, good corrosion resistance, high temperature resistance and the like.
Specifically, light reflected by an object is injected through a first lens in a lens group at the object side, the light is jointly acted through a plurality of spherical lenses in the lens group, then background interference outside an ultraviolet signal wave band is filtered out by a solar blind filter group, and finally the light is transmitted through a cathode quartz optical window.
In a specific embodiment, five, six, or seven lenses, etc. may be included in the lens group. For example, as shown in fig. 1, in the case where six spherical lenses are included in the lens group and the solar blind filter group includes four solar blind filters, the effect can be achieved by the combined action of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the first solar blind filter, the second solar blind filter, the third solar blind filter, the fourth solar blind filter and the cathode quartz optical window as shown in fig. 2,3 and 4. As can be seen from FIG. 2, the root mean square value of the speckle diameter of each field of view of the optical system of the solar blind ultraviolet lens is better than that of the conventional solar blind ultraviolet lensThe imaging is excellent. As can be seen from fig. 3, the distortion (distortion) value in the full field of view of the optical system of the solar blind ultraviolet lens is better than 1.5%, so that high fidelity of target detection can be realized. As can be seen from fig. 4, the MTF of each field of view of the optical system of the solar blind ultraviolet lens is better than 0.4 at 18lp/mm, and the imaging is excellent.
The solar blind ultraviolet lens comprises a lens group, a solar blind optical filter group and a cathode quartz optical window; the lens group is composed of a plurality of spherical lenses; one part of each spherical lens is made of calcium fluoride material, and the other part of each spherical lens is made of fused quartz material; the solar blind filter set comprises a plurality of solar blind filters; each spherical lens, each solar blind filter and the cathode quartz light window are sequentially arranged from the object side to the image side. Because the quality of the materials is small, the solar blind ultraviolet lens manufactured by the materials has the characteristic of light weight, and can be installed on an unmanned aerial vehicle for inspecting high-voltage power transmission equipment, so that non-contact automatic detection of the high-voltage power transmission equipment is realized, and the detection accuracy of the high-voltage power transmission equipment is further improved.
In one embodiment, at least a portion of each spherical lens forms a lens structure in which positive and negative lenses are alternately arranged.
Among them, a lens having positive power is called a positive lens, and a lens having negative power is called a negative lens.
Specifically, the curvature of field is curvature of an image plane, plane waves can become spherical waves through a spherical system, curvature of field is brought, astigmatism can also cause curvature of the image plane, curvature of field correction can be completed through high-low mixing of refractive indexes of alternately arranged positive and negative lenses, that is, at least one part of each spherical lens forms a lens structure of alternately arranged positive and negative lenses. Taking the case that the first lens is taken as a positive lens as an example, the second lens is taken as a negative lens, and the first lens and the second lens form a lens structure with alternately arranged positive and negative lenses; for another example, the first lens is a positive lens, the second lens is a negative lens, the third lens is a positive lens, and the first lens, the second lens and the third lens form a lens structure with alternately arranged positive and negative lenses.
In this embodiment, at least a part of each spherical lens forms a lens structure with alternately arranged positive and negative lenses, so that the effects of correcting field curvature and reducing spherical aberration can be achieved, and the imaging effect of the solar blind ultraviolet lens can be further improved.
In one embodiment, the lens group is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the first, third and fourth lenses are positive lenses, and the second, fifth and sixth lenses are negative lenses.
Specifically, as shown in fig. 1, six spherical lenses, that is, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6, may be included in the lens group. The first lens is a positive lens, the second lens is a negative lens, the third lens is a positive lens, the fourth lens is a positive lens, the fifth lens is a negative lens, and the sixth lens is a negative lens, because the positive lens generates negative spherical aberration, the negative lens generates positive spherical aberration, the effect of reducing spherical aberration can be achieved through the alternate arrangement of the positive lens and the negative lens, negative chromatic aberration is generated by the positive lens, and the effect that chromatic aberration is zero or close to zero can be achieved when the alternate arrangement of the positive lens and the negative lens is designed, so that field curvature correction can be completed through the refractive index height mixing of the positive lens and the negative lens.
In this embodiment, it is specifically described how to alternately arrange the positive and negative lenses in the solar blind ultraviolet lens, and by adopting such a lens arrangement mode, the field curvature of the solar blind ultraviolet lens can be corrected, which is beneficial to further improving the imaging effect of the solar blind ultraviolet lens.
In one embodiment, the length of the solar blind ultraviolet lens is less than or equal to 42mm.
Specifically, in order to make the solar blind ultraviolet lens easier to install on an unmanned aerial vehicle for inspecting high-voltage transmission equipment, the volume of the solar blind ultraviolet lens needs to be reduced as much as possible, and the length of the solar blind ultraviolet lens in the embodiment is smaller than or equal to 42mm, so that the requirement of the solar blind ultraviolet lens on small volume is met, and the convenience of installing the solar blind ultraviolet lens can be improved. In practical applications, the effective focal length of each lens in the lens group can be configured to reduce the overall length of the lens.
In one embodiment, the weight of the solar blind ultraviolet lens is less than or equal to 14.6g.
Specifically, in order to ensure the weight reduction of the solar blind ultraviolet lens, the weight of the solar blind ultraviolet lens needs to be reduced as much as possible, and the weight of the solar blind ultraviolet lens in the embodiment is less than or equal to 14.6g, so that the requirement of the weight reduction of the solar blind ultraviolet lens is met. In practical applications, the number and thickness of each spherical lens in the lens group may be configured to reduce the overall weight of the lens.
In one embodiment, the f-number of the solar blind ultraviolet lens is 1.8, the full field angle of the solar blind ultraviolet lens is 20 degrees, and the image facing angle line size of the solar blind ultraviolet lens is 10mm.
The F-number, which is the F-number, can be characterized by the ratio of the image-side focal length to the entrance pupil diameter of the solar blind ultraviolet lens. The f-number of the solar blind ultraviolet lens is 1.8, so that the solar blind ultraviolet lens is ensured to have higher detection sensitivity. The full field angle of the solar blind ultraviolet lens is the maximum position which is positioned in the front space, can be clearly expressed and has sufficient illumination. The full field angle of the solar blind ultraviolet lens is 20 degrees, which means that the solar blind ultraviolet lens has a larger field of view. The image plane of the solar blind ultraviolet lens refers to the maximum imaging range which can be supported by the solar blind ultraviolet lens, and the fact that the angular line size of the image plane of the solar blind ultraviolet lens is 10mm represents that the solar blind ultraviolet lens has a larger imaging range.
The first lens in the lens group can be designed into a negative lens to expand the field of view, and meanwhile, the first lens is matched with the cemented lens, so that the resolution capability of the solar blind ultraviolet lens is improved by utilizing the good dispersion performance of the cemented lens, and the solar blind ultraviolet lens is ensured to have enough field of view, imaging range and detection sensitivity while meeting the light weight requirement of the solar blind ultraviolet lens. In the embodiment, the f-number of the solar blind ultraviolet lens is 1.8, the full field angle of the solar blind ultraviolet lens is 20 degrees, the diagonal dimension of the image plane of the solar blind ultraviolet lens is 10mm, and the requirements of a visual field range, an imaging range and detection sensitivity can be met.
In one embodiment, with the object side being the front and the image side being the back, the front surface radius of the first lens is 16.576mm, and the back surface radius of the first lens is 150.551mm; the radius of the front surface of the second lens is-55.886 mm, and the radius of the rear surface of the second lens is 11.741mm; the radius of the front surface of the third lens is 19.139mm, and the radius of the rear surface of the third lens is-29.923 mm; the radius of the front surface of the fourth lens is 12.872mm, and the radius of the rear surface of the fourth lens is 151.663mm; the radius of the front surface of the fifth lens is-17.353 mm, and the radius of the rear surface of the fifth lens is-14.011 mm; the front surface radius of the sixth lens is 12.409mm, and the rear surface radius of the sixth lens is 7.020mm.
Specifically, in order to ensure the small volume requirement of the solar blind ultraviolet lens, the radius of each lens of the solar blind ultraviolet lens needs to be kept within a certain range. In the present embodiment, with the object side being the front and the image side being the rear, the radius of the front surface of the first lens is 16.576mm, and the radius of the rear surface of the first lens is 150.551mm; the radius of the front surface of the second lens is-55.886 mm, and the radius of the rear surface of the second lens is 11.741mm; the radius of the front surface of the third lens is 19.139mm, and the radius of the rear surface of the third lens is-29.923 mm; the radius of the front surface of the fourth lens is 12.872mm, and the radius of the rear surface of the fourth lens is 151.663mm; the radius of the front surface of the fifth lens is-17.353 mm, and the radius of the rear surface of the fifth lens is-14.011 mm; the radius of the front surface of the sixth lens is 12.409mm, the radius of the rear surface of the sixth lens is 7.020mm, and the solar blind ultraviolet lens can be ensured to have smaller volume.
In one embodiment, a diaphragm is arranged between the third lens and the fourth lens; the center-to-center distance between the front surface of the first lens and the rear surface of the first lens is 2.759mm, and the center-to-center distance between the rear surface of the first lens and the front surface of the second lens is 1.109mm; the center-to-center distance between the front surface of the second lens and the rear surface of the second lens is 1.210mm, and the center-to-center distance between the rear surface of the second lens and the front surface of the third lens is 1.073mm; the center distance between the front surface of the third lens and the rear surface of the third lens is 3.044mm, and the center distance between the rear surface of the third lens and the diaphragm is 0.100mm; the center distance between the diaphragm and the front surface of the fourth lens is 0.100mm; the center-to-center distance between the front surface of the fourth lens and the rear surface of the fourth lens is 3.058mm, and the center-to-center distance between the rear surface of the fourth lens and the front surface of the fifth lens is 1.903mm; the center-to-center distance between the front surface of the fifth lens and the rear surface of the fifth lens is 2.063mm, and the center-to-center distance between the rear surface of the fifth lens and the front surface of the sixth lens is 0.1mm; the center-to-center distance between the front surface of the sixth lens and the rear surface of the sixth lens is 2.077mm, and the center-to-center distance between the rear surface of the sixth lens and the front surface of the solar blind filter set is 2.578mm.
The aperture is an entity that limits the light beam in the optical system. It may be the edge of a lens, a frame or a specially arranged perforated screen. Its actions can be divided into two aspects: limiting the beam or limiting the field of view (imaging range) size.
Specifically, in order to ensure the small-volume requirement of the solar blind ultraviolet lens, the distance between the lenses of the solar blind ultraviolet lens needs to be kept within a certain range. The diaphragm is arranged between the third lens and the fourth lens, can be used for adjusting the intensity of light beams passing through the third lens and the fourth lens, is beneficial to guaranteeing the imaging quality of the solar blind ultraviolet lens, and is air space between the lenses of the solar blind ultraviolet lens. Further, in the present embodiment, a diaphragm is provided between the third lens and the fourth lens; the center-to-center distance between the front surface of the first lens and the rear surface of the first lens is 2.759mm, and the center-to-center distance between the rear surface of the first lens and the front surface of the second lens is 1.109mm; the center-to-center distance between the front surface of the second lens and the rear surface of the second lens is 1.210mm, and the center-to-center distance between the rear surface of the second lens and the front surface of the third lens is 1.073mm; the center distance between the front surface of the third lens and the rear surface of the third lens is 3.044mm, and the center distance between the rear surface of the third lens and the diaphragm is 0.100mm; the center distance between the diaphragm and the front surface of the fourth lens is 0.100mm; the center-to-center distance between the front surface of the fourth lens and the rear surface of the fourth lens is 3.058mm, and the center-to-center distance between the rear surface of the fourth lens and the front surface of the fifth lens is 1.903mm; the center-to-center distance between the front surface of the fifth lens and the rear surface of the fifth lens is 2.063mm, and the center-to-center distance between the rear surface of the fifth lens and the front surface of the sixth lens is 0.1mm; the center distance between the front surface of the sixth lens and the rear surface of the sixth lens is 2.077mm, the center distance between the rear surface of the sixth lens and the front surface of the solar blind filter set is 2.578mm, the length of the solar blind ultraviolet lens can be ensured to be within a certain range, and the small-volume requirement of the solar blind ultraviolet lens is further met.
In one embodiment, the solar blind filter set is used to filter out background interference outside the ultraviolet signal band.
In a specific embodiment, the minimum peak wavelength of the solar blind filter set is 261nm, and the maximum peak wavelength of the solar blind filter set is 267nm; the peak transmittance of the solar blind filter set is more than or equal to 30%; the bandwidth of the solar blind filter set is larger than or equal to 17nm; the length of the solar blind filter set is less than or equal to 16mm.
Specifically, in order to ensure the normal operation of the solar blind ultraviolet lens in the solar blind environment and the light weight requirement of the solar blind ultraviolet lens, a solar blind filter set can be arranged on the solar blind ultraviolet lens, wherein the minimum peak wavelength of the solar blind filter set is 261nm, the maximum peak wavelength of the solar blind filter set is 267nm, the peak transmittance of the solar blind filter set is greater than or equal to 30%, and the bandwidth of the solar blind filter set is greater than or equal to 17nm; the length of the solar blind filter set is less than or equal to 16mm.
In this embodiment, by setting the peak wavelength, the peak transmittance, the bandwidth and the length of the solar blind filter set, the solar blind ultraviolet lens can normally work in a solar blind environment and meet the requirement of light weight.
In one embodiment, the effective diameter of the photosurface cathode of the solar blind ultraviolet lens is 10mm.
The photosensitive surface refers generally to photographic emulsion layers, phototubes, photosensitive film layers in photocells or photoresistors, retinas of eyes, and the like. The solar blind ultraviolet lens is used for imaging an imaging target on a photosensitive surface.
Specifically, in order to ensure the imaging quality of the solar blind ultraviolet lens, the effective diameter of the photosurface cathode of the solar blind ultraviolet lens can be set to be 10mm.
In a specific embodiment, as shown in fig. 1, the solar blind ultraviolet lens further includes six spherical lenses, a solar blind ultraviolet filter and a cathode quartz optical window, which are sequentially arranged from an object surface to an image surface, and the solar blind ultraviolet lens includes 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 first solar blind filter 7, a second solar blind filter 8, a third solar blind filter 9, a fourth solar blind filter 10 and a cathode quartz optical window 11.
Further, the first lens, the third lens and the fourth lens are positive lenses, and calcium fluoride materials are adopted. The second lens, the fifth lens and the sixth lens are negative lenses and are made of fused quartz materials.
Further, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all spherical lenses, and air spaces are formed among the lenses.
Further, taking the object side as the front and the image side as the rear, the radius of the front surface of the first lens is 16.576mm, and the radius of the rear surface of the first lens is 150.551mm; the radius of the front surface of the second lens is-55.886 mm, and the radius of the rear surface of the second lens is 11.741mm; the radius of the front surface of the third lens is 19.139mm, and the radius of the rear surface of the third lens is-29.923 mm; the radius of the front surface of the fourth lens is 12.872mm, and the radius of the rear surface of the fourth lens is 151.663mm; the radius of the front surface of the fifth lens is-17.353 mm, and the radius of the rear surface of the fifth lens is-14.011 mm; the front surface radius of the sixth lens is 12.409mm, and the rear surface radius of the sixth lens is 7.020mm.
Further, the F number (F-number) of the solar blind ultraviolet lens is 1.8, the full field angle of the solar blind ultraviolet lens is 20 degrees, and the diagonal dimension of the image surface of the solar blind ultraviolet lens is 10mm.
Further, a diaphragm is arranged between the third lens and the fourth lens; the center-to-center distance between the front surface of the first lens and the rear surface of the first lens is 2.759mm, and the center-to-center distance between the rear surface of the first lens and the front surface of the second lens is 1.109mm; the center-to-center distance between the front surface of the second lens and the rear surface of the second lens is 1.210mm, and the center-to-center distance between the rear surface of the second lens and the front surface of the third lens is 1.073mm; the center distance between the front surface of the third lens and the rear surface of the third lens is 3.044mm, and the center distance between the rear surface of the third lens and the diaphragm is 0.100mm; the center distance between the diaphragm and the front surface of the fourth lens is 0.100mm; the center-to-center distance between the front surface of the fourth lens and the rear surface of the fourth lens is 3.058mm, and the center-to-center distance between the rear surface of the fourth lens and the front surface of the fifth lens is 1.903mm; the center-to-center distance between the front surface of the fifth lens and the rear surface of the fifth lens is 2.063mm, and the center-to-center distance between the rear surface of the fifth lens and the front surface of the sixth lens is 0.1mm; the center-to-center distance between the front surface of the sixth lens and the rear surface of the sixth lens is 2.077mm, and the center-to-center distance between the rear surface of the sixth lens and the front surface of the solar blind filter set is 2.578mm.
As shown in fig. 2, the Root Mean Square (RMS) value of the image point diffuse spot diameter of each field of view of the optical system of the solar blind ultraviolet lens shown in fig. 1 is better than 27 μm, and the imaging is excellent.
As shown in fig. 3, the distortion value in the full field of view of the solar blind ultraviolet lens optical system shown in fig. 1 is better than 1.5%, so that high fidelity of target detection is realized.
As shown in fig. 4, the MTF of each field of view of the solar blind ultraviolet lens optical system shown in fig. 1 is better than 0.4 at 18lp/mm, and the imaging is excellent.
In a specific embodiment, a solar blind ultraviolet lens is provided, and is mainly applied to the fields of power transmission line fault detection and the like based on an unmanned aerial vehicle platform. The main technical scheme is as follows: the solar blind ultraviolet lens is designed aiming at a miniaturized ultraviolet image intensifier with the diameter of a cathode of 10mm, the Tibbets structural improvement type is adopted, the light-weight design is realized by using 6 spherical lenses, the working wave band is 260nm-270nm, the miniaturized solar blind ultraviolet filter is matched, the field angle is finally realized, the total optical length is less than or equal to 42mm, the total optical weight is less than or equal to 14.6g (comprising the solar blind ultraviolet filter and a cathode quartz optical window), and the F number of the system is 1.8. In the embodiment, on the premise of ensuring that the visual field and the detection sensitivity of the solar blind ultraviolet lens meet the requirements of corona detection, the volume and the weight of the lens are obviously reduced, and effective support is provided for the function index of long-range endurance of the unmanned aerial vehicle.
In a specific embodiment, a solar blind ultraviolet lens is further provided, wherein the lens shell and the spherical lens spacer ring are manufactured by adopting PEI (Polyethylenimine, polyethylene imine) materials, and the surface is black. The solar blind ultraviolet lens and the ultraviolet detector are in threaded connection, the long-range view is clearly focused by rotating the threads to adjust the lens, and the solar blind ultraviolet lens and the ultraviolet detector are fastened and fixed by using parallel rings.
Compared with the solar blind ultraviolet lenses produced in batch, the solar blind ultraviolet lens has the advantages that the shell material and the optical design are optimized, the volume is reduced by 51%, the weight is reduced by 53% (the total optical weight is about 14.6g (including the solar blind ultraviolet filter and the cathode quartz optical window), the resolution and the detection sensitivity of the solar blind ultraviolet lens meet the technical requirements of the original solar blind ultraviolet lens, and meanwhile, the solar blind ultraviolet lens in the embodiment adopts fewer lenses and smaller lens caliber, so that the production cost is further reduced.
In one embodiment, there is further provided an unmanned aerial vehicle, which is provided with the solar blind ultraviolet lens according to the above embodiment.
Specifically, the traditional method for detecting corona discharge has very large defects in both infrared thermal imaging technology and ultrasonic detection technology, and is difficult to meet the requirements of a power grid. This is because sunlight contains strong infrared rays, and in an outdoor environment, a large number of heat sources are present, and the infrared thermal imaging technology leads to a high false detection rate. The ultrasonic detection technology can position the discharge source, but has low sensitivity, can not detect early discharge, is limited by the propagation of ultrasonic waves in the air, and can not judge the discharge amount. Therefore, in the high-voltage power transmission network and the high-speed rail traction circuit in China, corona discharge, especially in early-stage corona discharge detection, is one of the key technical problems which are needed to be solved urgently.
The corona discharge has weak luminescence in a solar blind ultraviolet band (240-280 nm), and can shield the interference of sunlight and improve the detection accuracy by detecting the band. The solar blind ultraviolet detector is used as a brand new technology for corona detection, has the advantages which are not possessed by the traditional technology, and the creative image intensifier and optical filter technology can not only have better blocking effect on sunlight, but also have photon-level sensitivity in a solar blind area, can detect extremely weak electric leakage arc, and can discover problems in advance in early dangerous stages. The solar blind ultraviolet imaging technology has the advantages of no interference of sunlight, ultrahigh sensitivity, accurate identification and the like, can discover a leakage power supply at the first time, discover and control the hazard in the early stage, and has great significance for safe transportation of a power grid. The system has the advantages of high sensitivity, all-weather operation, accurate positioning, low false detection rate and the like, and is very suitable for the offline detection requirement of a new generation of power grid. The solar blind ultraviolet lens provided by the application can be installed on an unmanned aerial vehicle due to the characteristics of light weight and miniaturization, and is used for detecting faults of a power transmission line, thereby being beneficial to improving the convenience of fault detection and the accuracy of fault detection results.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. The solar blind ultraviolet lens is characterized by comprising a lens group, a solar blind optical filter group and a cathode quartz optical window;
The lens group is composed of a plurality of spherical lenses; one part of each spherical lens is made of calcium fluoride material, and the other part of each spherical lens is made of fused quartz material; at least one part of each spherical lens forms a lens structure with alternately arranged positive and negative lenses;
The lens group consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; the first lens, the third lens and the fourth lens are positive lenses, and the second lens, the fifth lens and the sixth lens are negative lenses;
the solar blind filter set consists of a plurality of solar blind filters;
Each spherical lens, each solar blind filter and each cathode quartz optical window are sequentially arranged from the object side to the image side;
With the object side as the front and the image side as the back, the radius of the front surface of the first lens is 16.576mm, and the radius of the rear surface of the first lens is 150.551mm; the radius of the front surface of the second lens is-55.886 mm, and the radius of the rear surface of the second lens is 11.741mm; the radius of the front surface of the third lens is 19.139mm, and the radius of the rear surface of the third lens is-29.923 mm; the front surface radius of the fourth lens is 12.872mm, and the rear surface radius of the fourth lens is 151.663mm; the radius of the front surface of the fifth lens is-17.353 mm, and the radius of the rear surface of the fifth lens is-14.011 mm; the radius of the front surface of the sixth lens is 12.409mm, and the radius of the rear surface of the sixth lens is 7.020mm;
A diaphragm is arranged between the third lens and the fourth lens; a center-to-center distance between a front surface of the first lens and a rear surface of the first lens is 2.759mm, and a center-to-center distance between a rear surface of the first lens and a front surface of the second lens is 1.109mm; a center-to-center distance between a front surface of the second lens and a rear surface of the second lens is 1.210mm, and a center-to-center distance between a rear surface of the second lens and a front surface of the third lens is 1.073mm; a center distance between the front surface of the third lens and the rear surface of the third lens is 3.044mm, and a center distance between the rear surface of the third lens and the diaphragm is 0.100mm; the center distance between the diaphragm and the front surface of the fourth lens is 0.100mm; a center-to-center distance between a front surface of the fourth lens and a rear surface of the fourth lens is 3.058mm, and a center-to-center distance between a rear surface of the fourth lens and a front surface of the fifth lens is 1.903mm; a center-to-center distance between a front surface of the fifth lens and a rear surface of the fifth lens is 2.063mm, and a center-to-center distance between a rear surface of the fifth lens and a front surface of the sixth lens is 0.1mm; the center distance between the front surface of the sixth lens and the rear surface of the sixth lens is 2.077mm, and the center distance between the rear surface of the sixth lens and the front surface of the solar blind filter set is 2.578mm.
2. The solar blind ultraviolet lens of claim 1 wherein the lens is an optical element made of a material that transmits a specified spectrum.
3. The solar blind ultraviolet lens according to claim 1, wherein the aperture is an entity that limits the light beam in the optical system.
4. The solar blind ultraviolet lens according to claim 1, wherein the object side is a side where an object is located, and the image side is a side where an imaging party is located.
5. The solar blind ultraviolet lens of claim 4 wherein light rays from the object side are imaged at the image side.
6. The solar blind ultraviolet lens of claim 1, wherein the solar blind filter set is configured to filter background interference outside an ultraviolet signal band.
7. The solar blind ultraviolet lens of claim 6, wherein the minimum peak wavelength of the solar blind filter set is 261nm and the maximum peak wavelength of the solar blind filter set is 267nm; the peak transmittance of the solar blind filter set is greater than or equal to 30%; the bandwidth of the solar blind filter set is larger than or equal to 17nm; the length of the solar blind filter set is smaller than or equal to 16mm.
8. The solar blind ultraviolet lens according to claim 1, wherein the effective diameter of the photosurface cathode of the solar blind ultraviolet lens is 10mm.
9. The solar blind ultraviolet lens according to claim 1, wherein the solar blind filter set is composed of four solar blind filters which are sequentially arranged.
10. An unmanned aerial vehicle, wherein the unmanned aerial vehicle is fitted with a solar blind ultraviolet lens as claimed in any one of claims 1 to 9.
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| CN106405795A (en) * | 2016-10-18 | 2017-02-15 | 中国航空工业集团公司洛阳电光设备研究所 | Large-view-field large-relative-aperture solar blind ultraviolet 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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| JP2582918B2 (en) * | 1990-03-23 | 1997-02-19 | 大日本スクリーン製造株式会社 | Microscope objective lens |
| CN103412407B (en) * | 2012-10-20 | 2016-07-06 | 江苏五维电子科技有限公司 | multispectral image acquisition system |
| CN204795370U (en) * | 2014-04-18 | 2015-11-18 | 菲力尔系统公司 | Monitoring system and contain its vehicle |
| CN108258080A (en) * | 2016-12-28 | 2018-07-06 | 成都莹鑫海科技有限公司 | The preparation method of vacuum ultraviolet detector based on GaN photocathodes |
| CN107219612A (en) * | 2017-07-28 | 2017-09-29 | 长春国科精密光学技术有限公司 | A kind of day blind ultraviolet imagery optical lens and system |
| 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 |
| CN111061047B (en) * | 2020-02-19 | 2021-11-23 | 南京信息工程大学 | Solar blind ultraviolet lens with large relative aperture and long focal length and optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106405795A (en) * | 2016-10-18 | 2017-02-15 | 中国航空工业集团公司洛阳电光设备研究所 | Large-view-field large-relative-aperture solar blind ultraviolet 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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