CN209765143U - digital aerial surveying and mapping color camera optical system - Google Patents
digital aerial surveying and mapping color camera optical system Download PDFInfo
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- CN209765143U CN209765143U CN201920614154.8U CN201920614154U CN209765143U CN 209765143 U CN209765143 U CN 209765143U CN 201920614154 U CN201920614154 U CN 201920614154U CN 209765143 U CN209765143 U CN 209765143U
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Abstract
the utility model discloses a colored camera optical system of digital aviation survey and drawing, include: a front lens group, a middle lens group and a rear lens group; the front lens group includes a first lens, a second lens, and a third lens; the middle lens group comprises a fourth lens, a fifth lens, a diaphragm, a sixth lens and a seventh lens, and the fourth lens and the fifth lens form a double cemented lens; the rear lens group includes an eighth lens; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the diaphragm, the sixth lens, the seventh lens and the eighth lens are coaxially and sequentially arranged along the light incidence direction. The utility model discloses simple structure when optical system has big imaging field of view, high resolution and low distortion performance adopts less lens quantity, and the focal power of each lens of rational distribution makes up and rectifies elementary and senior aberration, and the imaging quality is excellent, has reduced optical system's processing manufacturing cost by a wide margin, realizes light small-size design.
Description
Technical Field
The utility model relates to an optical imaging technical field, more specifically say and relate to a colored camera optical system of digital aviation survey and drawing.
Background
the aerial surveying and mapping camera is carried on the airborne platform, can remotely image ground objects, provides high-resolution and low-distortion remote sensing image information, and is widely applied to the fields of agriculture and forestry, emergency disaster reduction, urban planning and construction and the like. Particularly, in recent years, with the introduction of concepts such as smart cities, digital cities and the like and the promotion of rapid development of digital cities, the aerial surveying and mapping camera can provide high-definition surveying and mapping images with large area arrays and high-resolution image information with precise positions, and can play an important role in emergency response, city security, city function and space layout, water conservancy pipeline construction and the like. The main technical characteristics are wide-area large-field imaging, high resolution, low distortion and light and small camera.
The traditional aviation mapping camera adopts a film to realize the acquisition of wide-area remote sensing images, and along with the technical development and continuous maturity of a CCD or CMOS photosensitive device of a large area array, the digital aviation mapping camera based on the CCD or CMOS device has the advantages of higher resolution, repeated use, capability of providing video images and the like, and gradually replaces the film-type aviation mapping camera. Due to the fact that the pixel size of the CCD or CMOS device is smaller, the imaging field of view is larger, and the requirement on an optical system of the camera is higher.
according to the actual application requirements, the optical systems of the digital aviation mapping camera are mainly divided into two types, one type is a color camera optical system for collecting spectral information of the ground, imaging is carried out on the basis of a color CCD or CMOS device, and spectral information data of ground objects are obtained; the lens has the characteristics of medium focal length, large relative aperture, high resolution, wide-angle imaging field of view and the like; the other type is a full-color camera optical system capable of carrying out high-resolution geometric information acquisition on the ground, and can carry out precise measurement on the ground object. The camera performs imaging based on a full-color high-performance CCD or CMOS device, and an optical system of the camera has the characteristics of longer focal length, larger relative aperture, higher resolution, wide-angle imaging field of view and the like.
The digital color aerial surveying and mapping camera and the digital panchromatic aerial surveying and mapping camera are combined to realize the fusion of image information and can acquire the color remote sensing image information with high resolution.
The optical system is a core part in a digital aerial survey color camera, needs to realize wide-angle high-resolution and low-distortion imaging, and has strict requirements on light and small size due to application to an aerial flight platform. The design of an optical system of a high-performance digital aerial surveying and mapping camera is a key research object for developing the aerial surveying and mapping camera technology at home and abroad.
The patent CN101482645.A provides a digital aerial survey color camera lens, the focal length is 31.24mm, the imaging field of view reaches 87.8 degrees, the MTF is more than or equal to 0.5@55lp/mm, the full-field distortion is less than 0.01 percent, and the imaging quality requirement of the aerial survey camera lens is met. However, the optical system is relatively complex, and up to 12 optical lens elements are adopted; in order to correct the aberration, a cemented triplet is used, which is complicated in processing and adjustment.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a colored camera optical system of digital aviation survey and drawing adopts less lens quantity, guarantees to realize light miniaturization and low cost simultaneously on the basis of big visual field, high resolution and low distortion performance.
The utility model provides a solution of its technical problem is: a digital aerial survey color camera optical system, comprising: a front lens group, a middle lens group and a rear lens group;
The front lens group includes a first lens, a second lens, and a third lens;
The middle lens group comprises a fourth lens, a fifth lens, a diaphragm, a sixth lens and a seventh lens, wherein the diaphragm is positioned between the fifth lens and the sixth lens, and the fourth lens and the fifth lens form a double cemented lens;
the rear lens group includes an eighth lens;
The third lens, the fifth lens, the sixth lens and the seventh lens are meniscus lenses, and focal powers are positive; the first lens, the second lens, the fourth lens and the eighth lens are meniscus lenses, and focal powers are negative;
The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the diaphragm, the sixth lens, the seventh lens and the eighth lens are coaxially and sequentially arranged along the light incidence direction.
As a further improvement of the above technical solution, the reciprocal of angular magnification of chief rays of the off-axis field of view of the front lens group is 1/γ, wherein 1/γ satisfies:
1.5≤1/γ≤1.8。
As a further improvement of the above technical solution, the power of the front lens groupthe focal power of the optical systemThe ratio of (A) to (B) satisfies:
focal power of the middle lens groupThe focal power of the optical systemThe ratio of (A) to (B) satisfies:
Focal power of the rear lens groupThe focal power of the optical systemThe ratio of (A) to (B) satisfies:
Whereinis the power of the front lens group,Is the power of the middle lens group,Is the focal power of the rear lens group,Is the optical power of the optical system.
as a further improvement of the above technical solution, the fifth lens is a thick lens.
as a further improvement of the above technical solution, the first lens is made of heavy lanthanum crown glass, the second lens is made of heavy lanthanum crown glass, and the third lens is made of heavy flint glass or flint glass; the fourth lens is made of heavy flint glass or flint glass, the fifth lens is made of heavy crown glass, the sixth lens is made of heavy lanthanum flint glass, and the seventh lens is made of crown glass; the eighth lens is made of heavy flint glass.
As a further improvement of the above technical solution, an optical surface of the fifth lens close to the stop is a first optical surface, an optical surface of the sixth lens close to the stop is a second optical surface, a height of an on-axis field-of-view marginal ray of the optical system at the first optical surface is h1, and a height of an on-axis field-of-view marginal ray of the optical system at the second optical surface is h2, where h1 and h2 satisfy:
0.95≤|h1/h2|≤1.15。
As a further improvement of the above technical solution, the diaphragm is an aperture diaphragm.
the utility model has the advantages that: the utility model discloses simple structure when optical system has big imaging field of view, high resolution and low distortion performance adopts less lens quantity, and the focal power of each lens is rationally distributed, and elementary and senior aberration are rectified in the combination, and the imaging quality is excellent, has reduced optical system's processing manufacturing cost by a wide margin, realizes light small-size design.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.
fig. 1 is a schematic diagram of the structure of the optical system of the present invention;
FIG. 2 is a graph of the optical transfer function of the optical system of the present invention at 55 lp/mm;
Fig. 3 is a distortion diagram of the optical system of the present invention;
Fig. 4 is a vertical axis aberration diagram of the optical system of the present invention.
Detailed Description
the conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the accompanying drawings, so as to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The utility model discloses each technical feature in the creation can the interactive combination under the prerequisite that does not contradict conflict each other.
embodiment 1, referring to fig. 1, a digital aerial surveying and mapping color camera optical system includes: a front lens group, a middle lens group and a rear lens group;
The front lens group includes a first lens 100, a second lens 200, and a third lens 300;
The middle lens group comprises a fourth lens 400, a fifth lens 500, a diaphragm 900, a sixth lens 600 and a seventh lens 700, the diaphragm 900 is positioned between the fifth lens 500 and the sixth lens 600, and the fourth lens 400 and the fifth lens 500 form a double-cemented lens;
The rear lens group includes an eighth lens 800;
The third lens 300, the fifth lens 500, the sixth lens 600 and the seventh lens 700 are meniscus lenses and have positive focal power; the first lens 100, the second lens 200, the fourth lens 400 and the eighth lens 800 are meniscus lenses and have negative focal power;
The first lens 100, the second lens 200, the third lens 300, the fourth lens 400, the fifth lens 500, the diaphragm 900, the sixth lens 600, the seventh lens 700, and the eighth lens 800 are coaxially and sequentially arranged along the incident direction of the incoming light.
preferably, the fifth lens 500 is a thick lens.
The fourth lens 400 and the fifth lens 500 form a double cemented lens, which can correct chromatic aberration and properly correct spherical aberration. Meanwhile, the fifth lens 500 is a thick lens, which is beneficial to reducing the light height, the high-level aberration and the design of a more compact optical system.
The utility model discloses avoid having used three cemented lens, three cemented lens adopt two cemented surfaces, are favorable to rectifying aberration such as chromatic aberration, spherical aberration or distortion even, but thickness tolerance ratio is more difficult to control, has increased the degree of difficulty and the manufacturing cost of processing and dress accent.
As an optimization, in the present embodiment, in order to obtain a sufficiently long rear working distance and control the system high-order aberration amount within an appropriately correctable range, the reciprocal of the angular magnification of the principal ray of the front lens group to the off-axis field of view is 1/γ, where 1/γ satisfies:
1.5≤1/γ≤1.8。
The off-axis field chief ray is the chief ray corresponding to the field beyond the zero field.
focal power of the front lens groupThe focal power of the optical systemthe ratio of (A) to (B) satisfies:
focal power of the middle lens groupThe focal power of the optical systemthe ratio of (A) to (B) satisfies:
Focal power of the rear lens groupthe focal power of the optical systemthe ratio of (A) to (B) satisfies:
whereinIs the power of the front lens group,is the power of the middle lens group,is the focal power of the rear lens group,is the optical power of the optical system.
for optimization, the first lens 100 is made of heavy lanthanum crown glass, the second lens 200 is made of heavy crown glass, and the third lens 300 is made of heavy flint glass or flint glass; the fourth lens 400 is made of heavy flint glass or flint glass, the fifth lens 500 is made of heavy crown glass, the sixth lens 600 is made of heavy lanthanum flint glass, and the seventh lens 700 is made of crown glass; the eighth lens 800 is made of heavy flint glass.
the utility model discloses do not adopt special glass materials such as fluorine crown glass or CaF2, this type of material is favorable to proofreading and correct the colour difference, but the price is expensive, thermal behavior is relatively poor, is unfavorable for optical system's no thermalization design, avoids adopting this type of glass material to guarantee that optical system is good at the image quality of great temperature range, and has reduced optical system's cost.
meanwhile, an aspheric lens is not adopted, a global surface lens is adopted to realize better control on distortion, the relative distortion of a full field of view is not more than 0.007%, the maximum deviation ideal position of a chief ray is not more than 2.5 mu m, the design of obtaining zero distortion is approached, and the realization of ensuring the geometric precision of an aerial surveying and mapping camera is facilitated.
preferably, an optical surface of the fifth lens 500 close to the stop 900 is a first optical surface, an optical surface of the sixth lens 600 close to the stop 900 is a second optical surface, a height of an on-axis field-of-view marginal ray of the optical system at the first optical surface is h1, and a height of an on-axis field-of-view marginal ray of the optical system at the second optical surface is h2, wherein h1 and h2 satisfy:
0.95≤|h1/h2|≤1.15。
Preferably, the diaphragm 900 is an aperture diaphragm.
The high-order positive astigmatism generated by the first optical surface of the fifth lens 500 close to the stop 900 is compensated with the high-order negative astigmatism generated by the second optical surface of the sixth lens 600 close to the stop 900.
The on-axis field edge ray refers to the edge ray of the zero field, i.e. the outermost one of the beams of the zero field.
in this embodiment, considering that the imaging field of view reaches 90 °, the vertical axis aberrations such as astigmatism, curvature of field, vertical axis chromatic aberration, and distortion associated with the field of view are difficult to control, and particularly, the distortion is the aberration strictly controlled by the optical system of the aerial surveying and mapping camera and is proportional to the third power of the field of view.
Based on the control of distortion aberration, if a symmetrical optical system structure is selected, the vertical axis aberration such as coma aberration, distortion, vertical axis chromatic aberration and the like can be automatically corrected, and the axial aberration such as spherical aberration, astigmatism, curvature of field and axial chromatic aberration is corrected by introducing the bending and gluing surfaces of the lens. But because the imaging distance is nearly infinite, the vertical axis aberration is greatly changed and is not automatically eliminated any more; and the distribution of axial aberrations also varies greatly.
Therefore, the present embodiment performs a large asymmetric change to adapt to various aberrations introduced by the asymmetric change of the object image, including:
1) The front lens group and the rear lens group are designed asymmetrically, the design of the front lens group is complicated, the value of the angular magnification of the front lens group to the off-axis main light is controlled, meanwhile, the front lens group adopts a lens combination with the focal power being negative, negative and positive, the complicated structure can reduce high-grade aberration, the miniaturization design of an optical system is facilitated, and more ideal rear working distance length is obtained.
2) the middle lens group changes asymmetrically, the symmetrical distribution of the lenses on the two sides of the diaphragm 900 is removed, a double-cemented lens is selected on one side of the diaphragm 900, two lenses with positive focal power are arranged on the other side of the diaphragm 900, and the change of the asymmetry mainly corrects the aberrations such as coma aberration, vertical axis chromatic aberration and the like.
3) and the difference between the height of the edge light of the field of view on the axis on the first optical surface and the height of the edge light on the second optical surface is controlled, so that the high-level spherical aberration amount is reduced.
the specific parameters of the optical system of the present embodiment are:
Focal length 34.93 mm; the relative aperture D/f is 1/5.6; the field angle is 90 degrees; no vignetting; at 55lp/mm, the average transfer function of the full visual field is more than 0.55; the relative distortion of the whole visual field is less than 0.007%; the total length of the optical system (the first lens 100 to the eighth lens 800 of the optical system) is 103.8mm, which is beneficial to realizing compact design of the camera; the rear working distance is 14.5mm, which is beneficial to the layout and installation of the detector.
the utility model has large imaging field of view, reaching 90 degrees, greatly improving imaging width; under the condition of 10km of flying height, the ground imaging width can reach 20km, the imaging efficiency and the time utilization rate are improved, the image information obtained in unit time is greatly improved, and the emergency response method can play an obvious advantage. Meanwhile, the imaging quality is excellent, and the average transfer function of the full field of view is better than 0.55@55 lp/mm.
On the premise of realizing a large imaging field of view, the focal power of each lens is reasonably distributed, the primary and high-level aberrations are combined and corrected, the index performance requirements can be met only by adopting 8 conventional and cheap lens glass materials, the processing and manufacturing cost of an optical system is greatly reduced, and the light and small design of a camera is facilitated.
referring to fig. 2, fig. 2 represents the optical transfer function curve distribution of the whole optical system in this embodiment, and the average optical transfer function value of the optical system exceeds 0.55 at 55lp/mm, and the imaging quality is good.
Referring to fig. 3, fig. 3 represents a distortion distribution curve of the optical system of the present embodiment, the distortion is not more than 0.007%, and is close to zero, so that the measurement error caused by distortion is effectively avoided, and the difficulty in geometric distortion correction of subsequent digital images is reduced.
Referring to fig. 4, fig. 4 shows a vertical axis aberration curve of the optical system of this embodiment, and aberrations such as coma aberration, astigmatism, and the like, which affect the symmetry distribution of the light spot, are better corrected.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (7)
1. a digital aerial survey color camera optical system, comprising: a front lens group, a middle lens group and a rear lens group;
The front lens group includes a first lens, a second lens, and a third lens;
The middle lens group comprises a fourth lens, a fifth lens, a diaphragm, a sixth lens and a seventh lens, wherein the diaphragm is positioned between the fifth lens and the sixth lens, and the fourth lens and the fifth lens form a double cemented lens;
The rear lens group includes an eighth lens;
The third lens, the fifth lens, the sixth lens and the seventh lens are meniscus lenses, and focal powers are positive; the first lens, the second lens, the fourth lens and the eighth lens are meniscus lenses, and focal powers are negative;
The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the diaphragm, the sixth lens, the seventh lens and the eighth lens are coaxially and sequentially arranged along the light incidence direction.
2. the digital aerial survey color camera optical system as claimed in claim 1, wherein: the reciprocal of the angular magnification of the front lens group to the chief ray of the off-axis field of view is 1/gamma, wherein 1/gamma satisfies:
1.5≤1/γ≤1.8。
3. The optical system of claim 1 for a color camera for digital aerial surveying and mappingcharacterized in that: focal power of the front lens groupthe focal power of the optical systemThe ratio of (A) to (B) satisfies:
focal power of the middle lens groupThe focal power of the optical systemThe ratio of (A) to (B) satisfies:
focal power of the rear lens groupThe focal power of the optical systemThe ratio of (A) to (B) satisfies:
Whereinis the power of the front lens group,Is the power of the middle lens group,Is the focal power of the rear lens group,Is the optical power of the optical system.
4. the digital aerial survey color camera optical system as claimed in claim 1, wherein: the fifth lens is a thick lens.
5. The digital aerial survey color camera optical system as claimed in claim 1, wherein:
The first lens is made of heavy lanthanum crown glass, the second lens is made of heavy crown glass, and the third lens is made of heavy flint glass or flint glass; the fourth lens is made of heavy flint glass or flint glass, the fifth lens is made of heavy crown glass, the sixth lens is made of heavy lanthanum flint glass, and the seventh lens is made of crown glass; the eighth lens is made of heavy flint glass.
6. The digital aerial survey color camera optical system as claimed in claim 1, wherein: the optical surface of the fifth lens close to the diaphragm is a first optical surface, the optical surface of the sixth lens close to the diaphragm is a second optical surface, the height of the edge ray of the on-axis field of view of the optical system at the first optical surface is h1, and the height of the edge ray of the on-axis field of view of the optical system at the second optical surface is h2, wherein h1 and h2 satisfy:
0.95≤|h1/h2|≤1.15。
7. The digital aerial survey color camera optical system as claimed in claim 1, wherein: the diaphragm is an aperture diaphragm.
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| CN201920614154.8U CN209765143U (en) | 2019-04-29 | 2019-04-29 | digital aerial surveying and mapping color camera optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007441A (en) * | 2019-04-29 | 2019-07-12 | 佛山科学技术学院 | A kind of number aerial mapping color camera optical system |
| CN111443466A (en) * | 2020-06-17 | 2020-07-24 | 成都纵横自动化技术股份有限公司 | Aerial survey camera lens and aerial photographing device |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007441A (en) * | 2019-04-29 | 2019-07-12 | 佛山科学技术学院 | A kind of number aerial mapping color camera optical system |
| CN110007441B (en) * | 2019-04-29 | 2023-11-28 | 佛山科学技术学院 | Digital aviation mapping color camera optical system |
| CN111443466A (en) * | 2020-06-17 | 2020-07-24 | 成都纵横自动化技术股份有限公司 | Aerial survey camera lens and aerial photographing device |
| CN111443466B (en) * | 2020-06-17 | 2020-09-08 | 成都纵横自动化技术股份有限公司 | Aerial survey camera lens and aerial photographing device |
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Assignee: DONGGUAN RUNRU INTELLIGENT TECHNOLOGY Co.,Ltd. Assignor: FOSHAN University Contract record no.: X2022990000857 Denomination of utility model: An Optical System of Digital Aerial Surveying and Mapping Color Camera Granted publication date: 20191210 License type: Common License Record date: 20221031 |