Optical system for multi-angle imaging with single camera

Abstract

The application discloses a kind of optical systems for realizing multi-angle imaging by single camera, comprising: first multi-angle beam splitter, second multi-angle beam splitter, two-channel shared primary mirror, two-channel shared secondary mirror, two-channel shared third mirror, first two-channel shared folding mirror, second two-channel shared folding mirror, B channel focal plane and A channel focal plane.The application can reduce the volume of remote sensor, and can change the observation angle according to the observation target, which can provide a new design idea for subsequent multi-angle remote sensor.This structure can be widely used in the field of space multi-angle remote sensing observation.

Description

Technical Field

[0001] This invention belongs to the field of space optical remote sensing technology, and in particular relates to an optical system for achieving multi-angle imaging with a single camera. Background Technology

[0002] Multi-angle optical remote sensing offers significant advantages over single-angle optical remote sensing. It can obtain more detailed and reliable three-dimensional spatial information of the Earth's surface, improving the interpretation accuracy of surface targets and the accuracy of parameter inversion, and providing a new approach to accurately obtain surface reflectance anisotropy. With the increase in observation angle, multi-angle remote sensing can further improve the level of quantification and reduce inversion uncertainty. Multi-angle optical remote sensing has become an important development direction in the field of optical remote sensing today. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide an optical system for multi-angle imaging with a single camera. This system can reduce the size of the remote sensor and change the observation angle of the earth according to the observation target. It can provide a new design idea for subsequent multi-angle remote sensors. This structural form can be widely used in the field of space multi-angle remote sensing observation.

[0004] The objective of this invention is achieved through the following technical solution: an optical system for multi-angle imaging using a single camera, comprising: a first multi-angle beam splitter, a second multi-angle beam splitter, a shared primary mirror for two channels, a shared secondary mirror for two channels, a shared tertiary mirror for two channels, a first shared folding mirror for two channels, a second shared folding mirror for two channels, a focal plane for channel B, and a focal plane for channel A; wherein, light rays from channel A are incident from infinity on the object side onto the first multi-angle beam splitter, pass through the first multi-angle beam splitter to the second multi-angle beam splitter, then to the shared primary mirror for two channels, then to the shared secondary mirror for two channels, and then to the shared tertiary mirror for two channels. After reflection by the secondary mirror, the light reaches the two-channel shared three-mirror, then the two-channel shared rotating mirror, and finally the two-channel shared rotating mirror. The light then converges at the focal plane of channel A. The light from channel B is incident from infinity on the object side to the two-channel shared primary mirror, then the two-channel shared secondary mirror, then the two-channel shared three-mirror, and finally the two-channel shared rotating mirror. The light then converges at the focal plane of channel B.

[0005] In the aforementioned optical system for multi-angle imaging using a single camera, the image-side focal length is 1000mm, the image-side F-number is 10, the full field of view is 20° × 0.45°, and the angle between channels A and B is 17°.

[0006] In the optical system described above for multi-angle imaging with a single camera, the reflecting surface of the shared primary mirror for the two channels is a hyperboloid of four orders.

[0007] In the optical system described above for multi-angle imaging using a single camera, the reflecting surface of the shared secondary mirror for the two channels is a quadratic convex hyperboloid.

[0008] In the optical system described above for multi-angle imaging using a single camera, the reflecting surface of the three mirrors shared by the two channels is a tenth-order ellipsoid.

[0009] In the aforementioned optical system for multi-angle imaging using a single camera, the reflecting surfaces of both the first two-channel shared folding mirror and the second two-channel shared folding mirror are planar.

[0010] In the aforementioned optical system for achieving multi-angle imaging with a single camera, both the first multi-angle beam splitter and the second multi-angle beam splitter are rectangular plane mirrors.

[0011] In the aforementioned optical system for multi-angle imaging using a single camera, the shared primary mirror for the two channels is a rectangular reflector with a concave radius of 60,000 mm and a vertical distance of 150 mm from the central axis. The distance between the shared primary mirror for the two channels and the second multi-angle beam splitter is 700 mm, and the tilt angle of the shared primary mirror for the two channels is 6 degrees.

[0012] In the aforementioned optical system for multi-angle imaging using a single camera, the shared secondary mirror for the two channels is a circular reflector with a convex surface radius of 1500mm and a distance of 600mm between the shared secondary mirror and the shared primary mirror for the two channels.

[0013] In the aforementioned optical system for multi-angle imaging using a single camera, the shared three mirrors for the two channels are rectangular mirrors; the concave radius of the shared three mirrors for the two channels is 1500mm, the vertical distance of the shared three mirrors for the two channels from the central axis is 150mm, and the distance between the shared three mirrors for the two channels and the shared secondary mirrors for the two channels is 600mm.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] This invention can reduce the size of the remote sensor and change the observation angle of the earth according to the observation target, which can provide a new design idea for subsequent multi-angle remote sensors. This structural form can be widely used in the field of space multi-angle remote sensing observation. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 This is a schematic diagram of the optical path of the optical system for achieving multi-angle imaging with a single camera provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the optical parameters of the optical system for multi-angle imaging using a single camera provided in an embodiment of the present invention. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the optical path of an optical system for multi-angle imaging using a single camera, provided in an embodiment of the present invention. Figure 1 As shown, the optical system for multi-angle imaging using a single camera includes: a first multi-angle beam splitter 1, a second multi-angle beam splitter 2, a primary mirror shared by two channels 3, a secondary mirror shared by two channels 4, a third mirror shared by two channels 5, a folding mirror shared by the first and second channels 6, a folding mirror shared by the second and third channels 7, a B-channel focal plane 8, and an A-channel focal plane 9. The aperture stop of the optical system is located on the secondary mirror.

[0021] This optical system is an off-axis reflection system. Rays from channel A are incident from infinity on the object side onto multi-angle beam splitter 1, then onto multi-angle beam splitter 2, then onto a shared primary mirror 3, then onto a shared secondary mirror 4, then reflected by the secondary mirror 4 to a shared third mirror 5, then reflected by the third mirror 5 to a shared folding mirror 6, then reflected by the folding mirror 6 to a shared folding mirror 7, and finally converge at the focal plane 9 of channel A. Rays from channel B are incident from infinity on the object side onto a shared primary mirror 3, then onto a shared secondary mirror 4, then reflected by the secondary mirror 4 to a shared third mirror 5, then reflected by the third mirror 5 to a shared folding mirror 6, then reflected by the folding mirror 6 to a shared folding mirror 7, and finally converge at the focal plane 8 of channel B.

[0022] The optical system is an off-axis reflection system. Rays from infinity on the object side are split by the front optical system and enter different channels of the multi-angle camera. They pass through the primary mirror to the secondary mirror, are reflected by the secondary mirror, reach the third mirror, are reflected by the third mirror, and finally converge on the focal planes at different angles.

[0023] The primary mirror's reflecting surface is a fourth-order hyperboloid, the secondary mirror's reflecting surface is a second-order convex hyperboloid, the tertiary mirror's reflecting surface is a tenth-order ellipsoid, the folding mirror's reflecting surface is a plane, and the multi-angle folding mirror is a plane mirror.

[0024] Both the multi-angle beam splitter 1 and the multi-angle beam splitter 2 are rectangular plane mirrors with a side length of 700mm × 140mm. The distance between them is 300mm. The angle can be set according to specific requirements. In this example, the combination of the two visible angle mirrors produces an angle of 17°.

[0025] The two channels share a common primary mirror 3, which is a rectangular reflector with a side length of 320mm × 160mm, a concave radius of 60000mm, a vertical distance of 150mm from the central axis, a distance of 700mm from the variable reflector 2, and a tilt angle of 6 degrees.

[0026] The secondary mirror 4 shared by the two channels is a circular reflector with an outer diameter of 100mm and a convex radius of 1500mm. It is 600mm away from the primary mirror shared by the two channels.

[0027] The three mirrors shared by the two channels, 5, are rectangular reflectors with sides of 400mm × 270mm; the concave radius is 1500mm, the vertical distance from the central axis is 150mm, and the distance from the secondary mirror 4 shared by the two channels is 600mm.

[0028] The shared folding mirror 1 for both channels is a rectangular reflector with a side length of 400mm × 240mm, a vertical distance of 210mm from the central axis, a distance of 600mm from the shared secondary mirror 3 for both channels, and an inclination angle of 30 degrees.

[0029] The two channels share a rotating mirror 2, which is a rectangular reflector with a side length of 400mm × 180mm and a vertical distance of 210mm from the central axis. The two channels share a rotating mirror 1 with a spacing of 400mm and an inclination angle of 13.7 degrees.

[0030] The optical parameters of the optical system can be achieved as follows: image-side focal length 1000mm, image-side F-number 10, visible light spectrum, full field of view 20° × 0.45°, and angle between the two channels 17°. For example... Figure 2 As shown in the figure, the transfer function curves of each field of view are close to the diffraction limit curve, indicating that the aberration correction of each field of view is good and the imaging quality is good.

[0031] To address the problem that multi-angle cameras typically consist of several cameras arranged at fixed angles to form a certain spatial angle, which not only occupies a large amount of satellite space but also cannot change the Earth-viewing angle, thus hindering multi-target and multi-scenario applications, this invention can reduce the size of the remote sensor and change the Earth-viewing angle according to the observation target. It can provide a new design concept for subsequent multi-angle remote sensors, and this structural form can be widely used in the field of space multi-angle remote sensing observation.

[0032] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. An optical system for achieving multi-angle imaging with a single camera, characterized in that... include: The system includes a first multi-angle beam splitter (1), a second multi-angle beam splitter (2), a primary mirror shared by two channels (3), a secondary mirror shared by two channels (4), a third mirror shared by two channels (5), a folding mirror shared by the first two channels (6), a folding mirror shared by the second two channels (7), a focal plane for channel B (8), and a focal plane for channel A (9); among which, The light ray from channel A is incident from infinity on the object side onto the first multi-angle beam splitter (1), then through the first multi-angle beam splitter (1) to the second multi-angle beam splitter (2), then through the two-channel shared primary mirror (3), then through the two-channel shared primary mirror (3) to the two-channel shared secondary mirror (4), then through the two-channel shared secondary mirror (4) and then through the two-channel shared third mirror (5), then through the two-channel shared third mirror (5) and then through the first two-channel shared folding mirror (6), then through the first two-channel shared folding mirror (6) and then through the second two-channel shared folding mirror (7), finally converging at the focal plane (9) of channel A. The light ray from channel B is incident from infinity on the object side to the two-channel shared primary mirror (3), passes through the two-channel shared primary mirror (3) to the two-channel shared secondary mirror (4), is reflected by the two-channel shared secondary mirror (4) and then reaches the two-channel shared third mirror (5), is reflected by the two-channel shared third mirror (5) and then reaches the first two-channel shared folding mirror (6), is reflected by the first two-channel shared folding mirror (6) and then reaches the second two-channel shared folding mirror (7), and finally converges at the focal plane (8) of channel B. The optical system for multi-angle imaging using a single camera has an image-side focal length of 1000mm, an image-side F-number of 10, a full field of view of 20°×0.45°, and an angle of 17° between the A and B channels.

2. The optical system for multi-angle imaging with a single camera according to claim 1, characterized in that: The reflecting surface of the primary mirror (3) shared by the two channels is a hyperboloid of four orders.

3. The optical system for multi-angle imaging with a single camera according to claim 1, characterized in that: The reflecting surface of the shared secondary mirror (4) for the two channels is a quadratic convex hyperboloid.

4. The optical system for multi-angle imaging with a single camera according to claim 1, characterized in that: The reflecting surface of the three mirrors (5) shared by the two channels is a tenth-order ellipsoid.

5. The optical system for multi-angle imaging with a single camera according to claim 1, characterized in that: The reflecting surfaces of the first two-channel shared rotating mirror (6) and the second two-channel shared rotating mirror (7) are both planar.

6. The optical system for multi-angle imaging with a single camera according to claim 1, characterized in that: Both the first multi-angle beam splitter (1) and the second multi-angle beam splitter (2) are rectangular plane mirrors.

7. The optical system for multi-angle imaging with a single camera according to claim 1, characterized in that: The two-channel shared primary mirror (3) is a rectangular reflector with a concave radius of 60,000 mm and a vertical distance of 150 mm from the central axis. The distance between the two-channel shared primary mirror (3) and the second multi-angle beam splitter (2) is 700 mm, and the tilt angle of the two-channel shared primary mirror (3) is 6 degrees.

8. The optical system for multi-angle imaging with a single camera according to claim 1, characterized in that: The shared secondary mirror (4) for the two channels is a circular reflector. The convex radius of the shared secondary mirror (4) for the two channels is 1500mm. The distance between the shared secondary mirror (4) for the two channels and the shared primary mirror (3) for the two channels is 600mm.

9. The optical system for multi-angle imaging with a single camera according to claim 1, characterized in that: The two-channel shared three mirror (5) is a rectangular reflector; the concave radius of the two-channel shared three mirror (5) is 1500mm, the vertical distance of the two-channel shared three mirror (5) from the central axis is 150mm, and the distance between the two-channel shared three mirror (5) and the two-channel shared secondary mirror (4) is 600mm.

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