An Imaging System Based on Quasi-Double Gaussian Structure

An imaging system, Gaussian technology, applied in the field of photoelectric detection, can solve problems such as low capability and difficulty in realizing high-altitude long-distance imaging, and achieve the effect of increasing the detectable distance, realizing high-altitude long-distance imaging, and high imaging quality

Active Publication Date: 2021-11-02
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the system needs a large focal length to achieve long-distance imaging, the size of the ball lens will exceed the upper limit of the existing processing technology, making it difficult to achieve high-altitude long-distance imaging
[0006] To sum up, the existing large-field imaging system has low ability to realize large-scale energy collection and small-scale high-resolution sub-field imaging at the same time, and it is difficult to realize high-altitude and long-distance imaging

Method used

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  • An Imaging System Based on Quasi-Double Gaussian Structure
  • An Imaging System Based on Quasi-Double Gaussian Structure
  • An Imaging System Based on Quasi-Double Gaussian Structure

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Embodiment 1

[0036] See figure 1 , figure 1 A schematic structural diagram of an imaging system based on a double-Gaussian structure provided by an embodiment of the present invention. The imaging system includes a primary imaging optical system 1 and a secondary imaging optical system 2 .

[0037]The main imaging optical system 1 includes a lens with a double-Gaussian structure, which is used to image the observation field of view on the spherical primary image surface, and correct the lateral chromatic aberration and astigmatism of the imaging during the imaging process, so that the position of each field of view on the spherical primary image surface image quality is similar. The similar image quality means that the aberration and distortion of each field of view position of the spherical primary image surface will not differ too much.

[0038] The quasi-double Gaussian structure lens described in this embodiment can be a lens combination with a double Gaussian structure, or a lens c...

Embodiment 2

[0042] On the basis of the first embodiment, this embodiment describes in detail the specific structure of the primary imaging optical system and the structure of the secondary imaging optical system.

[0043] See Figure 2a-Figure 2c , Figure 2a-Figure 2c It is a schematic diagram of a design process of a main imaging optical system provided by an embodiment of the present invention. The main imaging optical system 1 is an important component structure of the wide-field-of-view high-resolution imaging system. Its design process is as follows: the first choice is to select a symmetrical single-center objective lens A1, and the single-center objective lens has a ball lens A2 containing the center of curvature to form a ball lens. structure A, then an air gap B is inserted between the split halves of this concentric spherical lens, see Figure 2a ; By introducing an air gap B, the radius of curvature of the system is optimized. Afterwards, lens element C is inserted between ...

Embodiment 3

[0064] On the basis of embodiment two, this embodiment adopts image 3 and Figure 4 The formed imaging system is optimized according to the following design requirements: the focal length of the system is 115mm, which meets the requirements of telephoto long-distance imaging (about 7km), the imaging instantaneous field of view is 36°×36°, and the detector is Sony IMX226. Pixel size 1.85μm×1.85μm, active pixel array 4000(H)×3000(V), effective photosensitive area 7.5mm(H)×5.55mm(V), about 12M pixels, frame rate 30fps; imaging band is visible light band.

[0065] After optimization, please refer to Table 1 for the structural parameters of the main imaging optical system 1 , and please refer to Table 2 for the structural parameters of each sub-secondary imaging optical system 21 .

[0066] Surf:Type Radius Thickness glass Semi-Diameter OBJ Infinity Infinity - Infinity 1 227.825 28.093 BSM93 108.187 2 525.343 26.459 103.430 3 ...

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Abstract

The invention relates to an imaging system based on a double-Gaussian structure, including: a main imaging optical system, including a double-Gaussian-like lens, which is used to image the observation field of view on a spherical primary image surface, and correct the lateral chromatic aberration and dispersion of the imaging; The secondary imaging optical system includes several sub-secondary imaging optical systems, and several sub-secondary imaging optical systems are arranged behind the spherical primary image surface and distributed on a hemispherical surface with the center position of the main imaging optical system as the center of the sphere, for The primary image surface of the spherical surface is divided into several sub-images and overlapping fields of view exist between adjacent sub-images, and the residual aberration of the main imaging optical system is corrected at the same time. The imaging system can effectively realize large-scale continuous observation, and at the same time obtain detailed information of the target in the observation field, solve the contradiction between wide-area imaging and high-resolution imaging, increase the detectable distance, and thus realize high-altitude long-distance imaging.

Description

technical field [0001] The invention belongs to the field of photoelectric detection, and in particular relates to an imaging system based on a quasi-double Gaussian structure. Background technique [0002] Multi-objective wide-area reconnaissance and surveillance application scenarios such as border protection, sea area reconnaissance and search and rescue, and capital protection have put forward higher requirements for imaging systems with large field of view, high resolution, and high reconnaissance efficiency. The optical system is the direct factor determining the imaging performance of the imaging system. Its structure directly affects the performance of imaging resolution, field of view and aberration, and affects the performance of large field of view wide-area target search and small field of view high-precision target recognition and tracking. . [0003] Existing high-altitude large-field-of-view imaging uses photoelectric reconnaissance systems that adopt scannin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02B27/58G02B13/00G01V8/10
CPCG01V8/10G02B13/006G02B27/0025G02B27/58
Inventor 刘飞赵小明杨思原冯位欣段景博马生存刘佳维
Owner XIDIAN UNIV
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