CN114019751B - Light-splitting type double-channel space camera focal plane assembly, fixed focus device and method - Google Patents
Light-splitting type double-channel space camera focal plane assembly, fixed focus device and method Download PDFInfo
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- CN114019751B CN114019751B CN202111182364.2A CN202111182364A CN114019751B CN 114019751 B CN114019751 B CN 114019751B CN 202111182364 A CN202111182364 A CN 202111182364A CN 114019751 B CN114019751 B CN 114019751B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/32—Fiducial marks and measuring scales within the optical system
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/62—Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B19/00—Cameras
- G03B19/02—Still-picture cameras
- G03B19/023—Multi-image cameras
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Abstract
The invention relates to a light splitting type double-channel space camera focal plane assembly, a focusing device and a method, in particular to a process for installing and focusing a space camera with a multi-channel focal plane by adopting a spectroscope. Firstly, finely adjusting a lens through a through target to enable the field angle and the transfer function of the lens to meet the index of the lens; and then the spectroscope component is positioned by the multichannel targets, so that the focal plane view angles and the transfer functions of the two multichannel targets meet the system index. According to the combined assembling and adjusting method for the through adding sub-channels, the lens, the spectroscope and the sub-channel focal plane are positioned successively, so that the spectroscope exceeding the assembling and adjusting limit caused by large lens deviation is avoided, the sub-channel focal plane exceeding the assembling and adjusting limit caused by large spectroscope deviation is avoided, and the focusing efficiency and the focusing precision of the camera are greatly improved. The invention solves the high-precision fixed focus problem of the double-channel focal plane space camera and has great significance for the application development of the multi-band resource survey space camera.
Description
Technical Field
The invention belongs to the technical field of multichannel imaging remote sensing cameras, and particularly relates to a focal plane assembly, a fixed focus device and a fixed focus method of a light-splitting type double-channel space camera.
Background
With the development of optical remote sensing technology, the demand of human beings for detecting ground scenes is increasing. The larger the number of spectral bands of the focal plane detector of the space camera, the larger the information amount acquired by a single camera. When the detected scene type exceeds the number of spectral bands of a single detector, the detector type needs to be increased to meet the detection requirement. At present, a spectroscope is adopted for field-of-view light splitting in a space camera to form a multi-channel focal plane, and different types of detectors are configured on different channel focal planes, so that the purpose of detecting more bands is achieved. The introduction of the spectroscope increases an imaging channel, but also increases an adjustment link and difficulty for the fixed focus process of the camera. The comprehensive assembly and focusing of the spectroscope and the dual-channel focal plane are completed, so that the bands in all channels of the camera are ensured to meet the view field angle and the transfer function index, and the method is a key technology in the final assembly process of the camera.
At present, the device and the method for assembling and adjusting the focus of the light-splitting type double-channel focal plane space camera are not available, the process for assembling and adjusting the focus of the camera is urgently needed to be researched, a set of focusing device which can be processed and realized and an operable assembling and adjusting method are formed, the assembling and adjusting efficiency is improved, and the focusing precision is met.
Disclosure of Invention
The invention solves the technical problems that: the utility model provides a solve the fixed burnt problem of beam-splitting binary channels focal plane space camera, provides a suit of adjusting device and method, realizes the location of multichannel speculum and multichannel focal plane. The device is easy to realize, and the fixed focus efficiency is high, and the precision is high.
The technical scheme of the invention is as follows:
A spectral dual channel spatial camera focal plane assembly comprising: the device comprises a focal plane main frame, a spectroscope gasket, a first focal plane assembly gasket, a second focal plane assembly and a second focal plane assembly gasket.
The spectroscope is fixedly arranged in the focal plane main frame through a spectroscope gasket; the edge of the beam splitter, which is intersected by the first reflecting surface and the second reflecting surface, faces the lens, and the edge is perpendicular to the incident light direction; the direction of the incident light is taken as the positive direction of the Z axis, the direction along the detector linear array is taken as the Y axis, the direction perpendicular to the detector linear array is taken as the X axis, and a right-hand orthogonal coordinate system is established;
the spectroscope is used for splitting the effective view field light into two channels to form two focal planes, and the two focal planes comprise: a first focal plane assembly and a second focal plane assembly;
The first focal plane assembly is fixedly mounted on the focal plane main frame through a first focal plane assembly gasket, and the second focal plane assembly is fixedly mounted on the focal plane main frame through a second focal plane assembly gasket;
the first focal plane component faces the first reflecting surface of the spectroscope, and the second focal plane component faces the second reflecting surface of the spectroscope;
The light rays passing through the effective field of view of the first reflecting surface vertically enter the first focal plane assembly;
the light rays passing through the effective field of view of the second reflecting surface vertically enter the second focal plane assembly;
the spectroscope gasket is used for positioning and adjusting the spectroscope;
The first focal plane assembly gasket is used for positioning and adjusting the first focal plane assembly;
the second focal plane assembly gasket is used for positioning and adjusting the second focal plane assembly.
Optionally, the included angle between the first reflecting surface and the second reflecting surface of the spectroscope is 30-60 degrees.
Optionally, the included angle between the first reflecting surface and the second reflecting surface of the spectroscope is 45 degrees.
A spectral dual-channel focal plane space camera focusing device, comprising: the device comprises a straight-through support frame, a straight-through target, a first focal plane assembly support frame, a first focal plane assembly target, a second focal plane assembly support frame and a second focal plane assembly target;
The straight-through support frame is fixedly connected with the focal plane main frame;
The straight-through target is fixedly connected with the straight-through support frame;
the straight-through target is used for simulating the theoretical focal plane position of the camera under the condition of no spectroscope, and is carved with the theoretical band positions of the two focal plane components and the view field score line;
the first focal plane component supporting frame is fixedly connected with the focal plane main frame;
the first focal plane assembly target is fixedly connected with the first focal plane assembly support frame;
The first focal plane component target is used for simulating the theoretical focal plane position of the first focal plane component after spectroscope light splitting; the first focal plane assembly target has a theoretical band position of the first focal plane assembly inscribed thereon, and a field of view score line.
The second focal plane assembly supporting frame is fixedly connected with the focal plane main frame;
the second focal plane assembly target is fixedly connected with the second focal plane assembly support frame;
The second focal plane component target is used for simulating the theoretical focal plane position of the second focal plane component after spectroscope light splitting, and the theoretical band position of the second focal plane component and the view field line are carved on the second focal plane component target.
Optionally, the through support frame, the first focal plane assembly support frame and the second focal plane assembly support frame are all made of aluminum alloy.
Optionally, the materials of the through target, the first focal plane component target and the second focal plane component target are all K9 glass.
A method for carrying out fixed focus adjustment of a light-splitting type double-channel focal plane space camera by utilizing the light-splitting type double-channel focal plane space camera fixed focus device comprises the following steps:
1) A straight-through support frame and a straight-through target are arranged on the focal plane main frame, and one side of a band dividing plane of the straight-through support frame faces towards the lens; the through support frame is provided with a through groove, and the through target is positioned at the through groove of the through support frame; the length direction of the band score line on the direct-connection target is arranged along the Y axis;
2) Adjusting the lens so that the X-direction view angle of the band line on the through target corresponding to the vertical linear array on the focal plane and the Y-direction view angle of the line array meet the lens indexes, and the lens transfer function value of each view field meets the requirements;
3) Removing the through support frame and the through target from the focal plane main frame;
4) Fixedly mounting a spectroscope and a spectroscope gasket on the focal plane main frame, wherein the thickness of the spectroscope gasket is equal to the theoretical design thickness; the spectroscope can move along the Z direction of the incident light;
5) Fixedly mounting a first focal plane assembly support frame outside the focal plane main frame, wherein the mounting position of the first focal plane assembly support frame corresponds to the position of the first focal plane assembly; the first focal plane assembly target is fixedly arranged on the first focal plane assembly supporting frame; the target scribing surface of the first focal plane component faces the first reflecting surface of the spectroscope; the length direction of the band score line on the first focal plane assembly target is arranged along the Y axis;
6) Fixedly mounting a second focal plane supporting frame outside the focal plane main frame, wherein the mounting position of the second focal plane supporting frame corresponds to the position of the second focal plane component; the second focal plane target is fixedly arranged on the second focal plane supporting frame; the target scribing surface of the second focal plane component faces the second reflecting surface of the spectroscope; the length direction of the band score line on the second focal plane target is arranged along the Y axis;
7) The position of the spectroscope along the Z direction of incident light is adjusted, and meanwhile, the thickness of the spectroscope gasket is adjusted, so that the X-direction view angle of the vertical linear array on the focal plane and the Y-direction view angle of the linear array corresponding to the band score line on the first focal plane component target and the second focal plane component target meet indexes;
8) Fixing the mounting positions of the spectroscope and the spectroscope gasket, and removing the first focal plane component support frame, the first focal plane component target, the second focal plane component support frame and the second focal plane component target;
9) Fixedly mounting a first focal plane assembly, a first focal plane assembly gasket, a second focal plane assembly and a second focal plane assembly gasket on a focal plane main frame, wherein the thicknesses of the first focal plane assembly gasket and the second focal plane assembly gasket are equal to theoretical design thicknesses; the positions of the first focal plane component and the second focal plane component along the Z axis and the Y axis are adjusted, so that the X-direction view angle and the Y-direction view angle of the actual focal plane vertical linear array of the first focal plane component and the second focal plane component meet the camera index; the thicknesses of the first focal plane assembly gasket and the second focal plane assembly gasket are adjusted, so that the transfer function of the camera system also meets the index requirement.
Compared with the prior art, the invention has the advantages that:
(1) The invention adopts the fixed focus device and the method combining the straight-through and the sub-channel simulated focal plane targets, solves the problems of the sub-channel reflector and the adjustment of the focal planes of each channel in the fixed focus process of the light-splitting type double-channel focal plane space camera, and realizes double-channel imaging. By adopting the device and the method, the lens, the spectroscope component and the sub-channel focal plane are gradually and finely adjusted, the adjustment range of the sub-channel focal plane is finally reduced, and the focusing and focusing efficiency and the focusing accuracy of the camera are greatly improved.
(2) The target is carved with a band reticle in equal proportion to the detector, and + -1, + -0.7, + -0.5, + -0.3 and 0 field mark lines, so that the theoretical position of the focal plane and the key field position of the optical system are accurately simulated.
(3) The installation interfaces between the target support frame and the focal plane main frame and between the target and the target support frame are controlled by machining, and the installation reset deviation is controlled within 0.1mm, so that the stability of the installation and the setting of the focal point is ensured.
(4) The invention solves the fixed focus problem of the light splitting type double-channel focal plane space camera, realizes multi-channel imaging of the space camera and detection of more bands, improves the load application efficiency, and has important significance for application development of the space camera.
Drawings
FIG. 1 is a schematic diagram of an optical-mechanical structure of a spectral dual-channel focal plane space camera according to the present invention;
FIG. 2 is a schematic view of a focusing device of a spectroscopic dual-channel focal plane space camera according to the present invention;
FIG. 3 is a schematic view of an optical system of a spectroscopic dual-channel focal plane space camera according to the present invention;
FIG. 4 is a schematic view of focusing light rays of a lens through optical path of the dual-channel focal plane camera without a beam splitter;
FIG. 5 is a schematic view of a through target of the present invention;
FIG. 6 is a schematic view of a straight-through target carriage of the present invention;
FIG. 7 is a schematic view of focusing the lens light of the dual-channel focal plane camera according to the present invention after the lens light is split by the beam splitter;
FIG. 8 is a schematic diagram of a multichannel target of the present invention;
Fig. 9 is a schematic view of a multichannel target frame according to the present invention.
Detailed Description
The invention relates to a focal plane component of a light splitting type double-channel space camera, which comprises the following components: the device comprises a focal plane main frame 2, a spectroscope 3, a spectroscope gasket 4, a first focal plane assembly 5, a first focal plane assembly gasket 6, a second focal plane assembly 7 and a second focal plane assembly gasket 8.
The spectroscope 3 is fixedly arranged in the focal plane main frame 2 through a spectroscope gasket 4; the edge of the beam splitter 3, where the first reflecting surface and the second reflecting surface intersect, faces the lens 1, and the edge is perpendicular to the incident light direction; the direction of the incident light is taken as the positive direction of the Z axis, the direction along the detector linear array is taken as the Y axis, the direction perpendicular to the detector linear array is taken as the X axis, and a right-hand orthogonal coordinate system is established;
the light of the effective visual field is converged and irradiated onto the spectroscope 3 through the lens 1, the spectroscope 3 is used for splitting the light of the effective visual field into two channels to form two focal planes, and the two focal planes comprise: a first focal plane assembly 5 and a second focal plane assembly 7;
the first focal plane assembly 5 is fixedly mounted to the focal plane main frame 2 through a first focal plane assembly gasket 6, and the second focal plane assembly 7 is fixedly mounted to the focal plane main frame 2 through a second focal plane assembly gasket 8;
the first focal plane component 5 faces the first reflecting surface of the spectroscope 3, and the second focal plane component 7 faces the second reflecting surface of the spectroscope 3;
The light rays of the effective field of view passing through the first reflecting surface are vertically incident on the first focal plane assembly 5;
the light rays of the effective field of view passing through the second reflecting surface are vertically incident on the second focal plane assembly 7;
the spectroscope gasket 4 is used for positioning and adjusting the spectroscope 3;
the first focal plane assembly gasket 6 is used for positioning and adjusting the first focal plane assembly 5;
the second focal plane assembly gasket 8 is used for positioning and adjusting the second focal plane assembly 7.
The included angle between the first reflecting surface and the second reflecting surface of the spectroscope 3 is 30-60 degrees.
Preferably, the included angle between the first reflecting surface and the second reflecting surface of the spectroscope 3 is 45 degrees.
A light splitting type double-channel focal plane space camera fixed focus device comprises a straight-through support frame 9, a straight-through target 10, a first focal plane component support frame 11, a first focal plane component target 12, a second focal plane component support frame 13 and a second focal plane component target 14.
The straight-through support frame 9 is fixedly connected with the focal plane main frame 2, and the straight-through support frame 9 is made of metal, and is generally made of aluminum alloy.
The through target 10 is fixedly connected with the through support frame 9, and the material of the through target 10 is transparent glass, and K9 glass is generally adopted.
The straight-through target 10 is used for simulating the theoretical focal plane position of a camera without the spectroscope 3, and theoretical band positions of two focal plane components, and + -1, + -0.7, + -0.5, + -0.3 and 0 field of view lines are carved on the straight-through target 10;
The first focal plane component supporting frame 11 is fixedly connected with the focal plane main frame 2, and is made of metal, and aluminum alloy is generally adopted.
The first focal plane component target 12 is fixedly connected with the first focal plane component support frame 11, and is made of transparent glass, and K9 glass is generally adopted.
The first focal plane component target 12 simulates the theoretical focal plane position of the first focal plane component after the beam splitter 3 splits, and the theoretical band position of the first focal plane component is carved on the theoretical focal plane position, and the viewing field lines of +/-1, +/-0.7, +/-0.5, +/-0.3 and 0.
The second focal plane assembly supporting frame 13 is fixedly connected with the focal plane main frame 2, and is made of metal, and generally adopts aluminum alloy.
The second focal plane assembly target 14 is fixedly connected with the second focal plane assembly supporting frame 13, and is made of transparent glass, and K9 glass is generally adopted.
The second focal plane component target 14 is used for simulating the theoretical focal plane position of the second focal plane component after the beam splitter 3 splits, and theoretical band positions of the second focal plane component, and + -1, + -0.7, + -0.5, + -0.3 and 0 field of view score lines are carved on the second focal plane component target 14.
The straight-through support frame 9, the straight-through target 10, the first focal plane component support frame 11, the first focal plane component target 12, the second focal plane component support frame 13 and the second focal plane component target 14 are arranged in the same plane, and the reset precision of the installation interface is controlled within 0.1mm through machining.
A method for carrying out fixed focus adjustment of a light-splitting type double-channel focal plane space camera by utilizing the light-splitting type double-channel focal plane space camera fixed focus device comprises the following steps:
1) A straight-through support frame 9 and a straight-through target 10 are arranged on the focal plane main frame 2, and one side of a band dividing line surface of the straight-through support frame 9 faces the lens 1; the through bracket 9 is provided with a through groove, and the through target 10 is positioned at the through groove of the through bracket 9; the length direction of the band score line on the through target 10 is arranged along the Y axis;
2) The lens 1 is assembled and regulated, so that the X-direction view angle of a vertical linear array on a focal plane corresponding to a band line on the through target 10 and the Y-direction view angle of a linear array meet lens indexes, and the lens transfer function value of each view field meets the requirement;
3) Removing the through bracket 9 and the through target 10 from the focal plane main frame 2;
4) The spectroscope 3 and the spectroscope gasket 4 are fixedly arranged on the focal plane main frame 2, and the thickness of the spectroscope gasket 4 is equal to the theoretical design thickness; the spectroscope 3 is movable in the incident light Z direction;
5) Fixedly mounting a first focal plane assembly supporting frame 11 outside the focal plane main frame 2, wherein the mounting position of the first focal plane assembly supporting frame 11 corresponds to the position of the first focal plane assembly 5; the first focal plane assembly target 12 is fixedly arranged on the first focal plane assembly supporting frame 11; the first focal plane component target 12 score surface faces the first reflecting surface of the spectroscope 3; the length direction of the band score line on the first focal plane assembly target 12 is set along the Y axis;
6) Fixedly mounting a second focal plane supporting frame 13 outside the focal plane main frame 2, wherein the mounting position of the second focal plane supporting frame 13 corresponds to the position of the second focal plane assembly 7; the second focal plane target 14 is fixedly arranged on the second focal plane supporting frame 13; the second focal plane component target 14 is provided with a scribing surface facing the second reflecting surface of the spectroscope 3; the length direction of the band score line on the second focal plane target 14 is set along the Y axis;
7) The position of the spectroscope 3 along the Z direction of incident light is regulated, and meanwhile, the thickness of the spectroscope gasket 4 is regulated, so that the X-direction view angle of the vertical linear array on the corresponding focal plane of the band score lines on the first focal plane component target 12 and the second focal plane component target 14 and the Y-direction view angle of the linear array meet indexes;
8) Fixing the mounting positions of the spectroscope 3 and the spectroscope gasket 4, and dismantling the first focal plane assembly support frame 11, the first focal plane assembly target 12, the second focal plane assembly support frame 13 and the second focal plane assembly target 14;
9) Fixedly mounting a first focal plane assembly 5, a first focal plane assembly gasket 6, a second focal plane assembly 7 and a second focal plane assembly gasket 8 on the focal plane main frame 2, wherein the thicknesses of the first focal plane assembly gasket 6 and the second focal plane assembly gasket 8 are equal to theoretical design thicknesses; the positions of the first focal plane component 5 and the second focal plane component 7 along the Z axis and the Y axis are adjusted, so that the X-direction view angle and the Y-direction view angle of the actual focal plane vertical linear arrays of the first focal plane component 5 and the second focal plane component 7 meet the camera index; the thicknesses of the first focal plane assembly gasket 6 and the second focal plane assembly gasket 8 are adjusted, so that the transfer function of the camera system also meets the index requirement.
Examples
Fig. 1 is a schematic diagram of an optical-mechanical structure of a spectroscopic dual-channel focal plane space camera. The camera optical machine main body part comprises a lens 1 and a focal plane, in order to realize more band imaging, the camera focal plane part adopts a light splitting reflector 3 to split a view field into two channels, namely a first focal plane component 5 sub-focal plane and a second focal plane component 7 sub-focal plane. In the figure, the focal plane main frame 2 plays a role of supporting the beam splitter 3, the first focal plane component 5 and the second focal plane component 7. The spectroscope 3, the first focal plane assembly 5 and the second focal plane assembly 7 are respectively connected and fixed with the focal plane main frame 2 through the spectroscope gasket 4, the first focal plane assembly gasket 6 and the second focal plane assembly gasket 8. The three gaskets play a role in adjusting in the process of fixing the focus. Fig. 3 is a schematic diagram of a camera optical system. A camera focal length f; the first focal plane component detector has m spectral bands, and the second focal plane component detector has n spectral bands, so that m+n spectral band detection can be realized; effective field angle + -alpha DEG along Y direction of the linear array; the effective X-direction view angle theta 1°～θ4 degrees of the vertical linear array, wherein the first focal plane component X-direction effective view angle theta 3°～θ4 degrees and the second focal plane component X-direction effective view angle theta 1°～θ2 degrees.
By the device and the method provided by the invention, the fixed focus is carried out for the camera. Firstly, designing and processing a fixed-focus device. The fixed focus device is shown in fig. 2, and comprises: the straight-through bracket 9, the straight-through target 10, the first focal plane assembly bracket 11, the first focal plane assembly target 12, the second focal plane assembly bracket 13 and the second focal plane assembly target 14.
According to the method provided by the invention, the through bracket 9 and the through target 10 are designed and processed: the through optical path is first determined according to the optical parameters of the optical system and the focal plane main frame 2, as shown in fig. 4. In fig. 4, the beam splitter 3 is not shown, which simulates the light path where the lens rays are directly converged without passing through the beam splitter 3. F0 is a mechanical interface surface of the focal plane main frame in the direct direction, F0 is a direct light focusing surface, and the spectral bands of the B1 … … Bm first focal plane component 5 and the spectral bands of the B1B 2 … … bn second focal plane component 7 are all focused on the F0 surface. The through carriage 9 and the through target 10 are designed according to the parameters in fig. 4. Fig. 5 shows a schematic view of a through target 10, which is made of transparent material K9 glass, preferably 3-5mm thick. By a high precision lithography process (reticle precision over 0.001 mm), band reticles are lithographically produced on the through target 10, which contain all bands on the through focus plane f0, with the relative positional relationship between bands consistent with fig. 4, and with the band width consistent with the two focal plane assembly detector band widths. In addition to the band score lines, the targets are marked with field of view marker lines of the optical system along the Y directions + -1, + -0.7, + -0.5, + -0.3 and 0 of the linear array. The length and width of the through target 10 are required to meet the requirements of band scoring, and a certain framing allowance is reserved at the edge. Fig. 6 shows a schematic view of a through bracket 9 made of aluminum alloy, preferably 3-5mm in wall thickness. The through bracket 9 is provided with a through target mounting groove 15 and a through bracket mounting interface 16. The through target mounting groove 15 is matched with the external dimension of the through target 10, and the gap between the mounting groove and the target is controlled within 0.05mm through machining. The through support frame mounting interface 16 is matched with the through mechanical interface of the focal plane main frame 2, the through support frame mounting interface 16 is usually a through hole, and the diameter of the through hole and the outer diameter clearance of the mounting screw are controlled within 0.1mm through machining so as to ensure the resetting precision of the target. The position of the sinking groove surface of the direct-through target mounting groove 15 coincides with the direct-through light focusing surface f0 so as to ensure equal optical path length between the target band position and the actual light path focusing position.
According to the method provided by the invention, the first focal plane component supporting frame 11 and the first focal plane component target 12 are designed and processed: first, the spectroscopic path is determined according to the optical parameters of the optical system, the focal plane main frame 2, and the spectroscope 3, as shown in fig. 7. Fig. 7 simulates the light paths of the lens light after passing through the beam splitter 3 and converging in the directions of the first focal plane component and the second focal plane component respectively. F1 is a mechanical interface surface of the focal plane main frame 2 in the direction of the first focal plane component 5, F1 is a light focusing surface of the first focal plane component 5, and B1 … … Bm of a band of the first focal plane component 5 is focused on the F1 surface. F2 is the mechanical interface surface of the focal plane main frame 2 in the direction of the second focal plane assembly 7, F2 is the light focusing surface of the second focal plane assembly 7, and b1 … … bn of the band of the second focal plane assembly 7 is focused on the F2 surface. The first focal plane assembly frame 11 and the first focal plane assembly target 12 are designed according to the parameters in fig. 7. FIG. 8 (a) is a schematic view of a first focal plane assembly target 12, which is made of a light transmissive material K9 glass, preferably 3-5mm thick. By a high precision lithography process (reticle precision of 0.001mm or more), a band reticle is etched on the first focal plane assembly target 12, the band reticle contains all bands on the focal plane f1, the relative positional relationship between bands is consistent with fig. 7, and the band width is consistent with the first focal plane assembly 5 detector band width. In addition to the band score lines, the targets are marked with field of view marker lines of the optical system along the Y directions + -1, + -0.7, + -0.5, + -0.3 and 0 of the linear array. The length and width of the first focal plane assembly target 12 are required to meet the band scoring requirements, leaving a certain framing margin at the edge. FIG. 9 (a) is a schematic view of a first focal plane assembly frame 11, which is made of aluminum alloy, and preferably has a wall thickness of 3-5 mm. The first focal plane assembly supporting frame 11 is provided with a first focal plane assembly target mounting groove 17 and a first focal plane assembly supporting frame mounting interface 18. The first focal plane assembly target mounting groove 17 is matched with the external dimension of the first focal plane assembly target 12, and the gap between the mounting groove and the target is controlled within 0.05mm through machining. The first focal plane assembly support frame mounting interface 18 is matched with the first focal plane mechanical interface of the focal plane main frame 2, the first focal plane assembly support frame mounting interface 18 is usually a through hole, and the diameter of the through hole and the outer diameter gap of a mounting screw are controlled within 0.1mm through machining so as to ensure the resetting precision of the target. The position of the sinking groove surface of the first focal plane component target mounting groove 17 coincides with the first focal plane light focusing surface f1 so as to ensure that the target band position and the actual light path focusing position have equal optical paths.
The design method of the second focal plane assembly supporting frame 13 and the second focal plane assembly target 14 is similar to that of the first focal plane assembly, and will not be repeated.
After the design and processing of the fixed-focus device are finished, the fixed-focus is carried out according to the following steps:
(1) After the camera lens is initially assembled and adjusted, the through bracket 9 and the through target 10 are installed to the focal plane main frame 2, and the scribing surface of the through target 10 faces the lens 1. Fine-tuning the lens 1 so that the lens meets the following optical indexes: the X-direction field angle of the vertical linear array corresponding to Bm and b1 band score lines on the direct target 10 is theta 4°、θ1 degrees; y-direction view angles + -alpha degrees along the linear array corresponding to + -1 field of view score lines on the through target 10; the lens transfer function meets the index requirement.
(2) The through bracket 9 and the through target 10 are removed, the spectroscope 3 and the spectroscope gasket 4 (theoretical size) are installed, and meanwhile, the two sub-channel brackets 11 and 13 and the sub-channel targets 12 and 14 are installed, and the scribing surfaces of the sub-channel targets 12 and 14 face the reflecting mirror 3.
(3) The position of the spectroscope 3 along the Z direction (figure 2) and the thickness of the spectroscope gasket 4 are adjusted so that the B1 and Bm band score lines on the first focal plane component target 12 and the B1 and bn band score lines on the second focal plane component target 14 respectively meet the angle of view range of theta 3°～θ4°、θ1°～θ2 degrees.
(4) The spectroscope 3 and the spectroscope gasket 4 are fixed.
(5) Removing the subchannel brackets 11 and 13 and the subchannel targets 12 and 14, and installing a real focal plane assembly: first focal plane assembly 5, first focal plane assembly shim 6 (theoretical thickness), second focal plane assembly 7, second focal plane assembly shim 8 (theoretical thickness). The positions of the sub-channel focal planes 5, 7 in the Z direction (figure 1) are adjusted by means of theodolite measurement, so that the B1, bm spectral bands of the first focal plane component 5 and the B1, bn spectral bands of the second focal plane component 7 respectively meet the angle of view range of theta 3°～θ4°、θ1°～θ2 degrees. The positions of the sub-channel focal planes 5, 7 in the Y direction (figure 1) are adjusted by means of theodolite measurement so that the angles of view of the focal plane bands at both ends in the Y direction meet + -alpha deg.. And testing the system transfer function, and repairing the thicknesses of the first focal plane assembly gasket 6 and the second focal plane assembly gasket 8 according to the test result to ensure that the system transfer function meets the index requirement and finish the fixed focus work.
The device and the method provided by the invention are used for fixing the focus of a double-channel focal plane camera. As shown in fig. 1, the camera includes a lens 1, a focal plane main frame 2, a beam splitter 3, a beam splitter gasket 4, a first focal plane assembly 5, a first focal plane assembly gasket 6, a second focal plane assembly 7, and a second focal plane assembly gasket 8. The incident light of the camera is converged into the focal plane main frame 2 through the lens 1, and the spectroscope 3 splits the effective view field light into two channels to form two focal plane components, namely a first focal plane component 5 and a second focal plane component 7.
As shown in fig. 3, the focal length of the camera is 2000mm (f), the first focal plane component detector has 5 (m) bands, the second focal plane component detector has 4 (n) bands, and 9 (m+n) band detection can be realized; effective field angle along Y direction of the linear array is + -4 DEG (+ -alpha DEG); the total effective view angle of the vertical linear array in the X direction is 4.9-5.6 degrees (theta 1°～θ4 degrees), wherein the effective view angle of the first focal plane component is 5.3-5.6 degrees (theta 3°～θ4 degrees), and the effective view angle of the second focal plane component is 4.9-5.1 degrees (theta 1°～θ2 degrees).
According to the method provided by the invention, the following adjustment device is designed and processed:
As shown in fig. 4, the mechanical interface surface between the through bracket 9 and the focal plane main frame 2 is F0, the through bracket 9 is provided with a through target mounting groove 15, the through target 10 is embedded and mounted, and the target scribing surface faces the lens 1. The optical path of the sinking groove surface of the direct-connection target mounting groove 15 in the optical path is equal to the optical path of the direct-connection light focusing surface f 0. As shown in fig. 5, nine bands B1, B2, B3, B4, and B5 are engraved on the through target 10, and B1, B2, B3, B4, and B5 are five bands of the first focal plane assembly 5, and are equal in proportion to the detectors of the first focal plane assembly 5. b1, b2, b3, b4 are four spectral bands of the second focal plane assembly 7, in equal proportion to the second focal plane assembly 7 detector. The distance L=tan (4) ×2000×2= 279.71mm between the field mark lines of + -1, and the rest field mark lines are calculated according to the corresponding proportion of the field angle. B5, B1 pitch d=2000× (tan (5.6) -tan (4.9))=24.64 mm. The relative position of the target scribe line on the target is the same as the focal position of each band of the straight-through optical path of fig. 4. The mounting interface between the straight-through support frame 9 and the focal plane main frame 2 is a through hole, and the diameter of the through hole and the outer diameter clearance of the mounting screw are controlled within 0.1mm by machining; the clearance between the through target mounting groove 15 on the through bracket 9 and the target is controlled within 0.05mm by machining so as to ensure that the target resetting precision is within 0.1 mm.
As shown in fig. 7, the mechanical interface surface between the first focal plane component supporting frame 11 and the focal plane main frame 2 is F1, the first focal plane component supporting frame 11 is provided with a first focal plane component target mounting groove 17, the first focal plane component target 12 is embedded and mounted, and the target scribing surface faces the first reflecting surface of the reflecting mirror 3. The optical path of the sink surface of the first focal plane component target mounting groove 17 in the optical path is equal to the optical path of the light focusing surface f1 of the first focal plane component 5. As shown in fig. 8 (a), five bands B1, B2, B3, B4, and B5 are engraved on the first focal plane assembly target 12, in equal proportion to the first focal plane assembly 5 detector. The distance between the + -1 visual field marking lines is 279.71mm, and the rest visual field marking lines are calculated according to the corresponding proportion visual field angles. The relative position of the target scribe line on the target is the same as the focal position of each band of the first focal plane assembly 5 of fig. 7. The mounting interface between the first focal plane assembly support frame 11 and the focal plane main frame 2 is a through hole, and the diameter of the through hole and the outer diameter clearance of the mounting screw are controlled within 0.1mm by machining; the gap between the first focal plane component target mounting groove 17 and the target on the first focal plane component supporting frame 11 is controlled within 0.05mm through machining so as to ensure that the target resetting precision is within 0.1 mm.
The design method of the second focal plane assembly supporting frame 13 and the second focal plane assembly target 14 is similar to that of the first focal plane, and will not be repeated.
The fixed focus adjustment is completed according to the following steps:
1) The camera lens is initially assembled and adjusted, a through bracket 9 and a through target 10 are arranged on a focal plane main frame 2, and the target dividing surface faces to the lens 1;
2) Adjusting the lens to ensure that the Y-direction view angle of the linear array corresponding to the + -1 view field mark lines of the upper edge bands B5 and B1 of the through target 10 is + -4 degrees, the X-direction view angle of the vertical linear array corresponding to the bands B5 and B1 is 5.6 degrees and 4.9 degrees, and the transfer function of the lens in each view field of each band meets the lens index;
3) Removing the through bracket 9 and the through target 10 from the focal plane main frame 2;
4) A spectroscope 3 and a spectroscope gasket 4 are arranged on the focal plane main frame 2, and the spectroscope gasket 4 adopts theoretical thickness;
5) A first focal plane component supporting frame 11, a first focal plane component target 12, a second focal plane component supporting frame 13 and a second focal plane component target 14 are arranged on the focal plane main frame 2;
6) The position of the spectroscope 3 along the Z axis (figure 2) is adjusted, and the thickness of the spectroscope gasket 4 is adjusted, so that the Y-direction view angle of the linear array corresponding to the +/-1 view field mark lines of B1 and B5 on the first focal plane component target 12 is +/-4 degrees, and the X-direction view angle of the corresponding vertical linear array is 5.3 degrees and 5.6 degrees; the Y-direction view angles corresponding to the ±1 field mark lines of b1, b4 on the second focal plane assembly target 14 are ±4°, and the corresponding X-direction view angles are 4.9 ° and 5.1 °.
7) Fixing a spectroscope 3 and a spectroscope gasket 4, wherein the spectroscope gasket 4 is the thickness adjusted according to the step 6);
8) Removing the first focal plane assembly support frame 11, the first focal plane assembly target 12, the second focal plane assembly support frame 13 and the second focal plane assembly target 14 from the focal plane main frame 2;
9) A first focal plane assembly 5, a first focal plane assembly gasket 6, a second focal plane assembly 7 and a second focal plane assembly gasket 8 are arranged on the focal plane main frame 2, and the first focal plane assembly gasket 6 and the second focal plane assembly gasket 8 adopt theoretical thicknesses;
10 Using theodolites to monitor the angles of view of the first 5 and second 7 focal plane assembly detector bands in the X-direction of the vertical array and in the Y-direction of the linear array. The positions of the first focal plane component 5 and the second focal plane component 7 along the Z axis and the Y axis (figure 1) are adjusted, so that the positions of the band view fields of the detectors of the first focal plane component and the second focal plane component respectively meet the index requirements of the optical system of 5.3-5.6 degrees, 4.9-5.1 degrees and +/-4 degrees along the Y direction of the linear array.
11 The transfer functions of the system are measured, and the thicknesses of the first focal plane assembly gasket 6 and the second focal plane assembly gasket 8 are adjusted, so that the transfer functions of the fields of view of each band of the first focal plane assembly 5 and the second focal plane assembly 7 detector meet the indexes of the camera system.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Claims (5)
1. A fixed focus adjustment method for a light splitting type double-channel focal plane space camera is characterized in that,
A spectral dual channel spatial camera focal plane assembly comprising: a focal plane main frame (2), a spectroscope (3), a spectroscope gasket (4), a first focal plane assembly (5), a first focal plane assembly gasket (6), a second focal plane assembly (7) and a second focal plane assembly gasket (8);
The spectroscope (3) is fixedly arranged in the focal plane main frame (2) through a spectroscope gasket (4); the edge of the beam splitter (3) where the first reflecting surface and the second reflecting surface intersect faces the lens (1), and the edge is perpendicular to the incident light direction; the direction of the incident light is taken as the positive direction of the Z axis, the direction along the detector linear array is taken as the Y axis, the direction perpendicular to the detector linear array is taken as the X axis, and a right-hand orthogonal coordinate system is established;
The light of the effective visual field is converged and irradiated onto the spectroscope (3) through the lens (1), the spectroscope (3) is used for splitting the light of the effective visual field into two channels to form two focal planes, and the two focal planes comprise: a first focal plane assembly (5) and a second focal plane assembly (7);
The first focal plane assembly (5) is fixedly arranged on the focal plane main frame (2) through a first focal plane assembly gasket (6), and the second focal plane assembly (7) is fixedly arranged on the focal plane main frame (2) through a second focal plane assembly gasket (8);
The first focal plane component (5) faces the first reflecting surface of the spectroscope (3), and the second focal plane component (7) faces the second reflecting surface of the spectroscope (3);
the light rays passing through the effective field of view of the first reflecting surface vertically enter the first focal plane component (5);
the light rays passing through the effective field of view of the second reflecting surface vertically enter the second focal plane assembly (7);
The spectroscope gasket (4) is used for positioning and adjusting the spectroscope (3);
The first focal plane assembly gasket (6) is used for positioning and adjusting the first focal plane assembly (5);
the second focal plane assembly gasket (8) is used for positioning and adjusting the second focal plane assembly (7);
A spectral dual-channel focal plane space camera focusing device, comprising: the device comprises a straight-through support frame (9), a straight-through target (10), a first focal plane assembly support frame (11), a first focal plane assembly target (12), a second focal plane assembly support frame (13) and a second focal plane assembly target (14);
the straight-through support frame (9) is fixedly connected with the focal plane main frame (2);
the straight-through target (10) is fixedly connected with the straight-through support frame (9);
The straight-through target (10) is used for simulating the theoretical focal plane position of the camera under the condition that the spectroscope (3) is not arranged, and the theoretical band positions of the two focal plane components and the view field scribing line are carved on the straight-through target (10);
the first focal plane assembly supporting frame (11) is fixedly connected with the focal plane main frame (2);
The first focal plane component target (12) is fixedly connected with the first focal plane component support frame (11);
The first focal plane component target (12) is used for simulating the theoretical focal plane position of the first focal plane component after the beam splitting by the beam splitter (3); a theoretical band position of the first focal plane component and a field of view score line are carved on the first focal plane component target (12);
the second focal plane assembly supporting frame (13) is fixedly connected with the focal plane main frame (2);
the second focal plane assembly target (14) is fixedly connected with the second focal plane assembly support frame (13);
The second focal plane component target (14) is used for simulating the theoretical focal plane position of the second focal plane component after the spectroscope (3) is used for spectroscopically dividing, and the theoretical band position of the second focal plane component and the view field line are carved on the second focal plane component target (14);
The fixed-focus adjustment method comprises the following steps:
1) A straight-through support frame (9) and a straight-through target (10) are arranged on the focal plane main frame (2), and one side of a band score line surface of the straight-through support frame (9) faces towards the lens (1); the through support frame (9) is provided with a through groove, and the through target (10) is positioned at the through groove of the through support frame (9); the length direction of the band score line on the direct-connection target (10) is arranged along the Y axis;
2) The lens (1) is assembled and regulated, so that the X-direction view angle of a vertical linear array on a focal plane corresponding to a band dividing line on the through target (10) and the Y-direction view angle of the vertical linear array meet lens indexes, and the lens transfer function value of each view field meets the requirement;
3) Dismantling the straight-through support frame (9) and the straight-through target (10) from the focal plane main frame (2);
4) The spectroscope (3) and the spectroscope gasket (4) are fixedly arranged on the focal plane main frame (2), and the thickness of the spectroscope gasket (4) is equal to the theoretical design thickness; the spectroscope (3) can move along the Z direction of the incident light;
5) Fixedly mounting a first focal plane assembly supporting frame (11) outside the focal plane main frame (2), wherein the mounting position of the first focal plane assembly supporting frame (11) corresponds to the position of the first focal plane assembly (5); the first focal plane assembly target (12) is fixedly arranged on the first focal plane assembly support frame (11); the first focal plane component target (12) is provided with a scribing surface facing to a first reflecting surface of the spectroscope (3); the length direction of the band score line on the first focal plane assembly target (12) is arranged along the Y axis;
6) Fixedly mounting a second focal plane assembly supporting frame (13) outside the focal plane main frame (2), wherein the mounting position of the second focal plane assembly supporting frame (13) corresponds to the position of the second focal plane assembly (7); the second focal plane assembly target (14) is fixedly arranged on the second focal plane assembly support frame (13); the scribing surface of the second focal plane assembly target (14) faces the second reflecting surface of the spectroscope (3); the length direction of the band score line on the second focal plane assembly target (14) is arranged along the Y axis;
7) The position of the spectroscope (3) along the Z direction of incident light is regulated, and meanwhile, the thickness of the spectroscope gasket (4) is regulated, so that the X-direction view angle of a vertical linear array on a focal plane and the Y-direction view angle of a linear array corresponding to band score lines on a first focal plane component target (12) and a second focal plane component target (14) meet indexes;
8) Fixing the mounting positions of the spectroscope (3) and the spectroscope gasket (4), and dismantling the first focal plane component support frame (11), the first focal plane component target (12), the second focal plane component support frame (13) and the second focal plane component target (14);
9) Fixedly mounting a first focal plane assembly (5), a first focal plane assembly gasket (6), a second focal plane assembly (7) and a second focal plane assembly gasket (8) on a focal plane main frame (2), wherein the thickness of the first focal plane assembly gasket (6) and the thickness of the second focal plane assembly gasket (8) are equal to the theoretical design thickness; the positions of the first focal plane component (5) and the second focal plane component (7) along the Z axis and the Y axis are adjusted, so that the X-direction view angle and the Y-direction view angle of the actual focal plane vertical linear arrays of the first focal plane component (5) and the second focal plane component (7) meet camera indexes; the thicknesses of the first focal plane assembly gasket (6) and the second focal plane assembly gasket (8) are adjusted, so that the transfer function of the camera system also meets the index requirement.
2. The fixed focus adjustment method of the light splitting type double-channel focal plane space camera according to claim 1, wherein the included angle between the first reflecting surface and the second reflecting surface of the spectroscope (3) is 30-60 degrees.
3. The fixed focus adjustment method of the light splitting type double-channel focal plane space camera according to claim 2, wherein the included angle between the first reflecting surface and the second reflecting surface of the spectroscope (3) is 45 degrees.
4. The fixed focus adjustment method of the light splitting type double-channel focal plane space camera according to claim 1, wherein the material of the straight-through support frame (9), the material of the first focal plane component support frame (11) and the material of the second focal plane component support frame (13) are all made of aluminum alloy.
5. The method for focusing and adjusting a spectroscopic dual-channel focal plane space camera according to claim 1, wherein the direct-connection target (10), the first focal plane component target (12) and the second focal plane component target (14) are made of K9 glass.
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| CN102419207A (en) * | 2011-09-06 | 2012-04-18 | 中国科学院长春光学精密机械与物理研究所 | Spectral plane or focal plane installation and debugging method of hyperspectral imager |
| CN108833909A (en) * | 2018-07-16 | 2018-11-16 | 北京空间机电研究所 | A kind of binary channels focal plane registration debugging device and method |
| CN111896108A (en) * | 2020-07-13 | 2020-11-06 | 中国科学院空天信息创新研究院 | Method and device for assembling and adjusting imaging spectrometer |
| CN111999848A (en) * | 2020-08-04 | 2020-11-27 | 北京空间机电研究所 | Off-axis three-mirror multispectral space remote sensing camera double-imaging-channel optical lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102419207A (en) * | 2011-09-06 | 2012-04-18 | 中国科学院长春光学精密机械与物理研究所 | Spectral plane or focal plane installation and debugging method of hyperspectral imager |
| CN108833909A (en) * | 2018-07-16 | 2018-11-16 | 北京空间机电研究所 | A kind of binary channels focal plane registration debugging device and method |
| CN111896108A (en) * | 2020-07-13 | 2020-11-06 | 中国科学院空天信息创新研究院 | Method and device for assembling and adjusting imaging spectrometer |
| CN111999848A (en) * | 2020-08-04 | 2020-11-27 | 北京空间机电研究所 | Off-axis three-mirror multispectral space remote sensing camera double-imaging-channel optical lens |
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