Detector multiplexing device of large-breadth and high-resolution space remote sensing camera

Abstract

The invention discloses a detector multiplexing device of a large-breadth and high-resolution space remote sensing camera, which comprises a front optical system and a primary image plane, and is characterized in that the front optical system is used for converging a target and imaging the target on the primary image plane; the image segmentation device is a group of spherical reflectors and is used for segmenting primary imaging of a target to form a plurality of different sub-images; the segmented sub-images are transmitted to the focusing mirror, and the light passing through the focusing mirror is converged to the area array detector in a new array form. The system has the advantages of modularization, light weight, suitability for broadband detection from visible light to infrared light and the like, a primary image plane of the front optical system is segmented through the image splitter and is subjected to secondary imaging through the focusing mirror, conversion from linear array imaging to area array imaging is realized, and the detection precision is improved. Therefore, the problem of huge focal plane scale caused by a large-breadth and high-resolution space remote sensing camera in the linear array push-broom process can be effectively avoided.

Description

Technical Field

[0001] The invention relates to the field of space optical technology, and in particular to a detector multiplexing device for a wide-width and high-resolution space remote sensing camera. Background Art

[0002] Large-width, high-resolution space cameras can perform large-scale, full-time high-definition imaging of ground objects when used for aerospace remote sensing observations. They are widely used in military defense, atmospheric detection, resource exploration, natural disaster monitoring and other fields, and are one of the important means to ensure national defense security and monitor people's livelihood. With the development of space optical remote sensing technology, space remote sensing cameras with high resolution and large width have become one of the main development trends of optical payloads in the future. However, the pursuit of high resolution and large width will lead to an increasingly large focal plane of space remote sensing cameras.

[0003] Due to the limitations of detector materials and processing technology, the pixel size of a single detector cannot meet the requirements of wide bandwidth and high resolution at the same time. Using multiple detectors for stitching is a relatively effective way to solve this problem. However, the detector stitching method will increase the difficulty of electronic design and is not suitable for certain application fields that are sensitive to seams in the field of view. In addition, large-scale, long-array infrared detectors require huge cryostats, and the detector stitching method is not friendly to the design of such space optical payloads.

[0004] Based on the above technical problems, technicians in this field urgently need to develop a detector multiplexing device for a large-width, high-resolution space remote sensing camera that is modular, lightweight, and suitable for wide-band detection from visible to infrared. Summary of the invention

[0005] The object of the present invention is to provide a detector multiplexing device of a large-width, high-resolution space remote sensing camera which is modular, lightweight and suitable for wide-band detection from visible to infrared.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A detector multiplexing device for a wide-width, high-resolution space remote sensing camera of the present invention comprises:

[0008] A front optical system; and

[0009] A primary image plane, the front optical system converges the target and forms an image on the primary image plane;

[0010] An image splitter, which is a set of spherical reflectors, used to split the primary imaging of the target to form a plurality of different sub-images, and the position of the image splitter is located behind the primary image plane;

[0011] The multiplexing device also includes:

[0012] focusing mirror; and

[0013] The area array detector, the divided sub-images are transmitted to the focusing reflector, and the light after passing through the focusing reflector is converged onto the area array detector in a new array form.

[0014] Preferably, the front optical system adopts a linear array push-scan imaging optical system and is an image-side telecentric structure.

[0015] Preferably, the focusing reflector is a free-form surface.

[0016] Preferably, the number of the image segmenters and the focusing reflectors corresponds one to one, and there is a combination of different tilt angles between the corresponding image segmenters and the focusing reflectors.

[0017] Furthermore, the number of the image dividers and the focusing mirrors depends on the size of the image plane before segmentation, and the combination of the tilt angles between the image dividers and the focusing mirrors depends on the array form after the primary imaging conversion of the front optical system.

[0018] Preferably, the image segmentor and the focusing reflector form a secondary imaging module, and the secondary imaging module is capable of magnifying an image.

[0019] In the above technical solution, the detector multiplexing device of a wide-width and high-resolution space remote sensing camera provided by the present invention has the following beneficial effects:

[0020] The detector multiplexing device of a wide-width, high-resolution space remote sensing camera of the present invention has the advantages of modularization, light weight, and suitability for wide-band detection from visible to infrared. The primary image plane of the front optical system is divided by an image divider, and a focusing reflector is used to perform secondary imaging, thereby realizing the conversion from line array imaging to area array imaging. Therefore, the problem of a large focal plane size caused by a wide-width, high-resolution space remote sensing camera in the process of line array push scanning can be effectively avoided.

[0021] The present invention combines an image splitter and a focusing reflector. Since both are reflectors, no chromatic aberration is generated, and the applicable band range is wide, which is more friendly to infrared optical systems that require a certain scale of low-temperature thermostat.

[0022] The combination of the image divider and the focusing reflector in the present invention has a certain magnification, and when a secondary imaging is performed on the primary image plane of the front optical system, the resolution of the system can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 An optical path diagram of a detector multiplexing device for a wide-width, high-resolution space remote sensing camera provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the conversion of a primary imaging of a front optical system into an array form in a detector multiplexing device of a wide-width, high-resolution space remote sensing camera provided by an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Front optical system; 2. Primary image plane; 3. Image divider; 4. Focusing reflector; 5. Area array detector. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] See also Figure 1 , Figure 2 As shown;

[0030] A detector multiplexing device for a wide-width, high-resolution space remote sensing camera of the present invention comprises:

[0031] A front optical system 1; and

[0032] A primary image plane 2, the front optical system 1 converges the target and forms an image on the primary image plane 2;

[0033] An image splitter 3, which is a set of spherical reflectors, is used to split the primary image of the target into multiple different sub-images, and the image splitter 3 is located after the primary image plane 2 to ensure that there is overlap between the sub-image planes after the splitting, so as to facilitate subsequent image reconstruction;

[0034] The multiplexing device also includes:

[0035] focusing mirror 4; and

[0036] The area array detector 5 transmits the segmented sub-images to the focusing reflector 4, and the light rays passing through the focusing reflector 4 converge onto the area array detector 5 in a new array form.

[0037] As a preferred technical solution of this embodiment, the front optical system 1 adopts a linear push-scan imaging optical system. The focal plane of the optical system that uses push-scan imaging is smaller in the push-scan direction and larger in the vertical direction. Therefore, the multiplexing device provided by the present invention is mainly used for cutting and arraying a large width perpendicular to the push-scan direction; and the front optical system 1 is an image-side telecentric structure, which is used to balance the defocus caused by the tilt of the image divider.

[0038] As a preferred technical solution of this embodiment, the focusing reflector 4 is a free-form surface, which is used to correct the off-axis aberration caused by the tilt of the image slicer 3, so as to improve the imaging quality of the sliced ​​sub-images.

[0039] As a preferred technical solution of this embodiment, the number of the image segmenters 3 and the focusing reflectors 4 corresponds one to one, and there is a combination of different tilt angles between the corresponding image segmenters 3 and the focusing reflectors 4.

[0040] As a further introduction to this embodiment, the number of the image dividers 3 and the focusing mirrors 4 depends on the size of the image plane before division, and the combination of the inclination angles between the image dividers 3 and the focusing mirrors 4 depends on the array form after the primary imaging conversion of the front optical system 1.

[0041] like Figure 2 As described above, it is a schematic diagram of the conversion of the primary imaging of the front optical system 1 into an array form in this embodiment, wherein a, b, c, and d represent different segmentation configurations of the target image. As can be seen from the figure, the primary imaging of the front optical system 1 is converted from a line array to a planar array arrangement, but it is not limited to this arrangement.

[0042] As a preferred technical solution of this embodiment, the image segmenter 3 and the focusing reflector 4 form a secondary imaging module, and the secondary imaging module has a certain magnification factor for further improving the resolution of the entire optical system.

[0043] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A detector multiplexing device for a wide-width, high-resolution space remote sensing camera, characterized in that: The multiplexing device comprises: A front optical system (1); and A primary image plane (2), wherein the front optical system (1) converges the target and forms an image on the primary image plane (2); An image splitter (3), which is a group of spherical reflectors, used to split a primary image of the target to form a plurality of different sub-images, and the image splitter (3) is located behind the primary image plane (2); The multiplexing device also includes: a focusing reflector (4); and The area array detector (5) transmits the segmented sub-images to the focusing reflector (4), and the light rays passing through the focusing reflector (4) converge onto the area array detector (5) in a new array form.

2. The detector multiplexing device of a wide-width, high-resolution space remote sensing camera according to claim 1, characterized in that: The front optical system (1) adopts a linear array push-scan imaging optical system and is an image-side telecentric structure.

3. The detector multiplexing device of a wide-width, high-resolution space remote sensing camera according to claim 1, characterized in that: The focusing reflector (4) is a free-form surface.

4. The detector multiplexing device of a wide-width, high-resolution space remote sensing camera according to claim 1, characterized in that: The number of the image segmenters (3) and the focusing reflectors (4) corresponds one to one, and there is a combination of different tilt angles between the corresponding image segmenters (3) and the focusing reflectors (4).

5. The detector multiplexing device of a wide-width, high-resolution space remote sensing camera according to claim 4, characterized in that: The number of the image splitters (3) and the focusing reflectors (4) depends on the size of the image plane before segmentation, and the combination of the tilt angles between the image splitters (3) and the focusing reflectors (4) depends on the array form of the front optical system (1) after a primary imaging conversion.

6. The detector multiplexing device of a wide-width, high-resolution space remote sensing camera according to claim 1, characterized in that: The image segmenter (3) and the focusing reflector (4) form a secondary imaging module, and the secondary imaging module is capable of magnifying an image.

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