CN111413806B - Dual-mode switching system for space coronagraph and switching method thereof - Google Patents
Dual-mode switching system for space coronagraph and switching method thereof Download PDFInfo
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- CN111413806B CN111413806B CN202010271019.5A CN202010271019A CN111413806B CN 111413806 B CN111413806 B CN 111413806B CN 202010271019 A CN202010271019 A CN 202010271019A CN 111413806 B CN111413806 B CN 111413806B
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Abstract
The invention relates to the field of space coronagraphs, in particular to a dual-mode switching system for a space coronagraph and a switching method thereof. The switching system comprises a self-calibration light source switching device, a light path switching device and a positioning device. A plurality of self-calibration light sources in the self-calibration light source switching device are connected with a wavelength division multiplexer through optical fibers, and the wavelength division multiplexer is connected with an optical fiber connector. The optical path switching device is characterized in that a motor is connected with a worm, the worm and a worm wheel shaft are arranged on an outer frame, the worm wheel is arranged on the worm wheel shaft and meshed with the worm, an optical fiber fixing rod is arranged at the locking end of the worm wheel shaft, and an optical fiber connector is arranged on the optical fiber fixing rod. The encoder is connected to the positioning end of the worm wheel shaft. The switching method comprises the steps that an encoder obtains angle position information; rotating the worm wheel shaft to the position of a calibration angle, and calibrating the light path; when the worm wheel shaft rotates to the zero position, the starlight enters the space coronagraph. The invention provides a switching system with higher precision and reliability and smaller weight and volume by improving the structure.
Description
Technical Field
The invention relates to the field of space coronagraphs, in particular to a dual-mode switching system for a space coronagraph and a switching method thereof.
Background
The space coronagraph needs to carry out self calibration on the whole light path before working, and the high-order wave aberration of the system is accurately corrected through a high-precision wave aberration control technology, and the mode is called a self-calibration mode. After the coronagraph self-calibration is completed, the calibration light source needs to be moved out of the light path, and the telescope starlight is introduced into the light path and enters an observation mode for scientific observation. When the observation mode and the self-correction mode of the space coronagraph are switched, the light path switching system of the observation starlight and self-correction mode of the space coronagraph in the prior art is large in size, and the switching precision and reliability are difficult to meet higher requirements.
Chinese patent document CN106970448A discloses a biaxial multi-optical-path switching device suitable for a large-scale solar telescope. The device comprises a double-channel rotating shaft, a polarizing device, a driving worm gear pair and a motor. The quick switching and accurate positioning of the polarization device or other optical devices are realized through computer control, and the double-shaft multi-light-path channel switching device is suitable for large-scale solar telescopes. One set of device can realize two sets of optical device supports and the automatically controlled switching of a plurality of light path passageway simultaneously, compact structure. However, this device is not compatible with the switching system of the space coronagraph.
In summary, when the observation mode and the self-calibration mode of the space coronagraph are switched, how to develop a switching system with higher precision, more reliability, and smaller weight and volume becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a dual-mode switching system for a space coronaries, which has higher precision and reliability and smaller weight and volume.
In order to achieve the purpose, the invention adopts the following scheme:
a dual-mode switching system for a space coronagraph comprises a self-calibration light source switching device, a light path switching device and a positioning device;
the self-calibration light source switching device comprises wavelength division multiplexers, self-calibration light sources and optical fiber connectors, wherein the self-calibration light sources are connected with one ends of the wavelength division multiplexers through optical fibers, the other ends of the wavelength division multiplexers are connected with the optical fiber connectors, and isolators are arranged between each self-calibration light source and each wavelength division multiplexer;
the optical path switching device comprises a speed reducing motor, a worm and gear box, a worm gear, a base, an optical fiber fixing rod and a worm gear shaft, wherein the base is fixedly arranged on the space coronagraph and serves as a supporting structure of the optical path switching device;
the positioning device comprises a V-shaped groove positioning block and an encoder, the encoder is fixedly arranged at the positioning end of the worm wheel shaft through a second coupler, the V-shaped groove positioning block is fixedly arranged on the base, and the V-shaped groove of the V-shaped groove positioning block is used for positioning that when the side surface of the optical fiber fixing rod is pressed in the V-shaped groove, the axis of the optical fiber connector is collinear with the central line of the optical path of the space coronagraph;
in the self-correcting mode, a speed reducing motor is started, the speed reducing motor drives a worm and a worm wheel to rotate, a worm wheel shaft and the worm wheel synchronously and coaxially rotate, an optical fiber fixing rod is driven by the worm wheel shaft to rotate towards a V-shaped groove positioning block, an encoder determines the position of the optical fiber fixing rod by detecting the rotation angle of the worm wheel shaft, when the rotation angle detected by the encoder is consistent with a calibration angle, the speed reducing motor is closed, the side face of the optical fiber fixing rod is pressed in the V-shaped groove, the axis of an optical fiber connector is collinear with the central line of a space coronagraph light path, and output light of a self-correcting light source enters the space coronagraph light path;
in an observation mode, the speed reducing motor is turned off, the optical fiber fixing rod is located at a position completely separated from the optical path of the space coronarism, and the starlight enters the optical path of the space coronarism.
Preferably, when the optical fiber fixing rod is completely separated from the position of the space coronagraph, the zero position of the encoder is marked, the rotation angle is the angle of rotation of the worm wheel shaft relative to the position corresponding to the zero position of the encoder, the calibration angle is larger than the standard rotation angle, the standard rotation angle is the angle of rotation of the worm wheel shaft from the position corresponding to the zero position of the encoder, and the side surface of the turning optical fiber fixing rod is in contact with the position in the V-shaped groove.
Preferably, quick-change connectors are arranged at two ends of the optical fiber between the isolator and the self-calibration light source.
Preferably, the self-calibration light source switching device has 2 self-calibration light sources.
Preferably, the optical fiber fixing rod is fixedly mounted at the locking end of the worm gear shaft by a fastener.
Preferably, the surfaces of the worm, worm gear, worm shaft, first bearing assembly and second bearing assembly are coated with a molybdenum disulfide coating.
Preferably, the outer surfaces of the optical path switching device and the positioning device are coated with black coatings.
According to the invention, a switching method for a dual-mode switching system of a space coronagraph is also proposed, comprising the following steps:
the method comprises the following steps that firstly, an encoder acquires information of a zero position, a standard rotation angle and a calibration angle;
step two, the gear motor drives the worm wheel shaft to rotate to a position of a calibration angle, and the self-calibration light source switching device introduces output light of different self-calibration light sources into a light path of the space coronagraph;
and step three, after the light path calibration of the space coronagraph is finished, the speed reducing motor drives the worm wheel shaft to rotate to the zero position, and the starlight enters the light path of the space coronagraph.
Compared with the prior art, the invention has the following prominent substantive characteristics and remarkable progress through the improvement of the structure:
1. the self-calibration light source switching device completes the switching of the self-calibration light sources by controlling the on and off of the two self-calibration light sources. Compared with the traditional light source switching device, the switching-in of different self-correcting light sources by the movement mechanism is reduced, and the size and the weight of the device are reduced. And because the space coronagraph is used in space, the movement mechanism needs to be specially customized, and the cost is extremely high. The moving mechanism is reduced in the device, and the cost is reduced.
2. When the encoder determines the calibration angle, the side surface of the optical fiber fixing rod is pressed in the V-shaped groove with proper pretightening force, so that the movement gap of the worm and gear mechanism is eliminated, and the switching precision is improved.
3. The surfaces of moving parts such as the worm wheel, the worm wheel shaft, the first bearing assembly, the second bearing assembly and the like are plated with molybdenum disulfide layers, so that the dynamic characteristics of the moving parts in a vacuum environment are ensured.
4. The surfaces of the light path switching device and the positioning device are blackened, so that the influence of stray light on the performance of the space coronarism instrument or related detection equipment is reduced.
Drawings
FIG. 1 is a schematic diagram of a dual mode switching system for a space coronagraph in an embodiment of the present invention;
fig. 2 is a cross-sectional view at a-a in fig. 1.
Reference numerals: the device comprises a wavelength division multiplexer 1, an isolator 2, an optical fiber 3, a first self-calibration light source 4, an optical fiber connector 5, a second self-calibration light source 6, a motor 7, a base 8, a first coupler 9, a first bearing assembly 10, a worm 11, a worm gear box 12, a V-shaped groove positioning block 13, a worm gear 14, an optical fiber fixing rod 15, a bolt 16, a second bearing assembly 17, a second coupler 18, an encoder 19 and a worm gear shaft 20.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The dual-mode switching system of the space coronaries instrument shown in fig. 1 and 2 is used for switching the self-correcting mode and the observing mode of the space coronaries instrument. The dual-mode switching system comprises a self-calibration light source switching device, an optical path switching device and a positioning device. A wavelength division multiplexer (1) in a self-calibration light source switching device couples output optical fibers of a plurality of self-calibration light sources into one optical fiber for light beam output. This fiber introduces the calibration light source into the optical path of the space coronet through a fiber optic connection 5. And the plurality of self-calibration light sources are switched on and off (when one self-calibration light source is turned on, other self-calibration light sources are turned off), so that the self-calibration light sources are switched in the self-calibration mode. A speed reduction motor 7 in the optical path switching device drives an optical fiber fixing rod 15 to rotate through a worm gear and a worm to complete switching of optical paths, and then switching of two modes of the space coronagraph is achieved. And a V-shaped groove positioning block 13 and an encoder 19 in the positioning device are used for ensuring the switching precision of the dual-mode switching system.
The self-calibrating light source switching device as shown in fig. 1 includes a wavelength division multiplexer 1, an isolator 2, an optical fiber 3, a first self-calibrating light source 4, an optical fiber connector 5, and a second self-calibrating light source 6. The first self-calibration light source 4 and the second self-calibration light source 6 are respectively connected with one end of the wavelength division multiplexer 1 through the optical fiber 3, the other end of the wavelength division multiplexer 1 is connected with the optical fiber connector 5, the isolator 2 is arranged between the first self-calibration light source 4 and the wavelength division multiplexer 1, and the isolator 2 is also arranged between the second self-calibration light source 6 and the wavelength division multiplexer 1.
Quick-change connectors are arranged at two ends of the optical fiber between the isolator 2 and the first self-calibration light source 4 and the second self-calibration light source 6 and used for quickly connecting the optical fiber with interfaces of the isolator 2, the first self-calibration light source 4 and the second self-calibration light source 6.
One end of the optical fiber between the wavelength division multiplexer 1 and the isolator 2 is provided with a quick connector, and the quick connector is used for quickly connecting an interface of the isolator 2. The wavelength division multiplexer 1 couples the other ends of the two optical fibers shown in fig. 1 to an output optical fiber for outputting light beams. The other end of the output fibre is provided with a quick-change coupling for quick connection to the interface of the fibre optic coupling 5.
Optionally, the self-calibrating light source switching device has a plurality of self-calibrating light sources.
As shown in fig. 1 and fig. 2, the optical path switching device includes a reduction motor 7, a base 8, a worm 11, a worm gear box 12, a worm wheel 14, an optical fiber fixing rod 15, and a worm wheel shaft 20. The base 8 is used as a supporting structure of the light path switching device and is fixedly arranged on the space coronagraph.
The worm gear box 12 is fixedly arranged on the base 8. The worm 11, the worm wheel 14 and the worm wheel shaft 20 are disposed in the worm gear case 12. The axis of the worm 11 is perpendicular to the central line of the optical path of the space coronagraph. The worm wheel 14 meshes with the worm 11. The worm gear 14 is an interference fit with the worm gear shaft 20. The axis of the worm gear shaft 20 is parallel to the central line of the optical path of the space coronagraph.
The worm 11 is provided with a first bearing assembly 10, and the first bearing assembly 10 comprises 2 first bearings, and the 2 first bearings are respectively arranged on bearing positioning steps at two ends of the worm 11. The housing of the worm gear housing 12 is provided with a first bearing assembly mount. The 2 first bearings are placed in the first bearing assembly mounting seat and play a role of positioning and supporting the worm 11. The worm 11 comprises 1 input end, and the input end is the end of the worm 11 far away from the optical path of the space coronagraph. The input end and the other end of the worm 11 extend out of the box body of the worm gear box 12.
The worm wheel shaft 20 is provided with a second bearing assembly 17, and the second bearing assembly 17 comprises 2 second bearings, and the 2 second bearings are respectively arranged on bearing positioning steps at two ends of the worm wheel shaft 20. The housing of the worm gear housing 12 is provided with a second bearing assembly mount. The 2 second bearings are located in the second bearing assembly mount and serve to position and support the worm gear shaft 20. The worm-gear shaft 20 comprises a locking end and a positioning end, wherein the locking end is the end of the worm-gear shaft 20 pointing to the light path inlet of the space coronagraph. The locking end and the positioning end of the worm-gear shaft 20 extend out of the housing of the worm gear housing 12.
The gear motor 7 is fixedly arranged on the base 8. The output shaft of the speed reducing motor 7 is connected with the input end of the worm 11 through a first coupling 9.
The optical fiber fixing rod 15 is fixedly installed at the locking end of the worm-gear shaft 20 by means of a bolt 16. The optical fiber connector 5 is fixedly mounted on the optical fiber fixing rod 15. The axis of the optical fiber connector 5 is parallel to the central line of the optical path of the space coronagraph.
Optionally, the surfaces of the first bearing assembly 10, the worm 11, the worm wheel 14, the second bearing assembly 17 and the worm wheel shaft 20 are all coated with a layer of molybdenum disulphide. The molybdenum disulfide layer plays a lubricating role for the mutual movement of the moving parts.
As shown in fig. 1 and fig. 2, the positioning device includes a V-groove positioning block 13 and an encoder 19. The encoder 19 is fixedly mounted on the positioning end of the worm wheel shaft 20 through the second coupling 18. V type groove locating piece 13 fixed mounting is on base 8. The V-shaped groove on the V-shaped groove positioning block 13 is used for positioning the optical fiber fixing rod 15. The V-shaped groove ensures that the axis of the optical fiber connector 5 is collinear with the central line of the optical path of the space coronagraph when the side surface of the optical fiber fixing rod 15 is pressed in the V-shaped groove.
Optionally, the side surface of the optical fiber fixing rod 15 is a circular arc surface. The arc surface can be better matched with the positioning of the V-shaped groove.
Optionally, the outer surfaces of the optical path switching device and the positioning device are blackened. The external surface is blackened, so that the interference of stray light to the space coronagraph can be reduced.
The space coronagraph needs to carry out self calibration on the whole light path before working, and the self-calibration light source switching device respectively sends light with different wavelengths into the light path. As shown in fig. 1, a first self-calibration optical path is formed between the first self-calibration light source 4 and the wavelength division multiplexer 1, and a second self-calibration optical path is formed between the second self-calibration light source 6 and the wavelength division multiplexer 1. When the first self-calibration light source 4 and the second self-calibration light source 6 are used for calibrating the light path of the space coronaries, the first self-calibration light source 4 is turned on, the second self-calibration light source 6 is turned off, and the axis of the optical fiber connector 5 is collinear with the central line of the light path of the space coronaries. The output light of the first self-calibration light source 4 is guided into the optical fiber connector 5 through the first self-calibration light path and the wavelength division multiplexer 1 and the output optical fiber, and then enters the light path of the space coronarism instrument.
The first self-calibration light source 4 completes calibration of the space coronagraph, and the self-calibration light source switching device switches the two self-calibration light sources. Namely, the first self-calibration light source 4 is turned off, the second self-calibration light source 6 is turned on, and the axis of the optical fiber connector 5 is collinear with the central line of the optical path of the space coronaries. The output light of the second self-calibration light source 6 is guided into the optical fiber connector 5 through the second self-calibration light path and the wavelength division multiplexer 1 and the output optical fiber, and then enters the light path of the space coronarism instrument.
The isolator 2 in the first self-calibration light path and the second self-calibration light path separates the two self-calibration light sources, and mutual interference between the two self-calibration light paths is prevented.
The self-calibration light source switching device in this embodiment completes switching of the self-calibration light sources by controlling the turning on and off of the two self-calibration light sources. Compared with the traditional light source switching device, the switching-in of different self-correcting light sources by the movement mechanism is reduced, and the size and the weight of the device are reduced. And because the use environment of the space coronagraph is in space, the movement mechanism needs to be specially customized, and the cost is extremely high. The moving mechanism is reduced in the device, and the cost is reduced.
When the self-calibration light source switching device with the plurality of self-calibration light sources switches the self-calibration light sources, one of the self-calibration light sources is turned on, and the other self-calibration light sources are turned off, so that the output light of only one self-calibration light source in the light path is ensured.
In the self-calibration mode of the space coronarism instrument, as shown in fig. 1 and fig. 2, the side surface of the optical fiber fixing rod 15 is pressed in the V-shaped groove, and the axis of the optical fiber connector 5 is collinear with the central line of the optical path of the space coronarism instrument.
In the self-calibration mode, the speed reduction motor 7 in the optical path switching device is turned on, and the speed reduction motor 7 drives the worm 11 and the worm wheel 14 to rotate through the first coupler 9. Because the worm wheel 14 is in interference fit with the worm wheel shaft 20, the worm wheel shaft 20 and the worm wheel 14 rotate coaxially in synchronization. The locking end of the worm-gear shaft 20 and the optical fiber fixing lever 15 are fastened by a bolt 16. The optical fiber fixing rod 15 is driven by the worm gear shaft 20 to rotate towards the V-groove positioning block 13. An encoder 19 is mounted on the positioning end of the worm shaft 20 by a second coupling 18. The encoder 19 determines the position of the optical fiber fixing rod 15 by detecting the rotation angle of the worm wheel shaft 20. When the rotation angle detected by the encoder 19 is consistent with the calibration angle, the speed reducing motor 7 is turned off, the side surface of the optical fiber fixing rod 15 is pressed in the V-shaped groove, and the axis of the optical fiber connector 5 is collinear with the central line of the optical path of the space coronagraph.
The zero position of the encoder 19 is marked at the position where the optical fiber fixing rod 15 is completely separated from the optical path of the space coronagraph. The encoder 19 detects the rotation angle of the worm wheel shaft 20 as an angle by which the worm wheel shaft 20 rotates with respect to a position corresponding to the null position of the encoder 19. When the worm-gear shaft 20 is turned from the position corresponding to the zero position of the encoder 19 to the position where the side surface of the optical fiber fixing rod 15 just contacts the V-groove, the angle of rotation of the worm-gear shaft 20 is called the standard rotation angle.
In order to ensure high switching precision, the calibration angle of the optical path switching device is larger than a standard rotation angle, so that the side surface of the optical fiber fixing rod 15 is pressed in the V-shaped groove with proper pretightening force to eliminate the switching gap of the worm gear mechanism.
In observation mode, the speed reduction motor 7 in the optical path switching device is turned off, the optical fiber fixing rod 15 is located at a position completely separated from the optical path of the space coronarism, and the starlight enters the optical path of the space coronarism.
The action of the optical path switching device for switching the space coronaries from the self-calibration mode to the observation mode is as follows: the gear motor 7 is started to drive the side face of the optical fiber fixing rod 15 to rotate towards the direction of separating from the V-shaped groove until the side face of the optical fiber fixing rod rotates to the position corresponding to the zero position of the encoder 19, and the gear motor 7 is closed. The optical path switching device completes switching from the self-calibration mode to the observation mode.
The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be made in the present invention in addition to the above embodiments. It will be understood by those skilled in the art that various changes, substitutions of equivalents, and alterations can be made without departing from the spirit and scope of the invention.
Claims (8)
1. A dual-mode switching system for a space coronagraph is characterized by comprising a self-calibration light source switching device, an optical path switching device and a positioning device;
the self-calibration light source switching device comprises wavelength division multiplexers, self-calibration light sources and optical fiber connectors, wherein the self-calibration light sources are connected with one ends of the wavelength division multiplexers through optical fibers, the other ends of the wavelength division multiplexers are connected with the optical fiber connectors, and isolators are arranged between the self-calibration light sources and the wavelength division multiplexers;
the light path switching device comprises a speed reducing motor, a worm and gear box, a worm gear, a base, an optical fiber fixing rod and a worm gear shaft, wherein the base is fixedly installed on the space coronagraph and used as a supporting structure of the light path switching device, the worm gear and the worm gear shaft are arranged in the worm and gear box, the axis of the worm is perpendicular to the central line of the light path of the space coronagraph, the worm gear is meshed with the worm, the axis of the worm gear shaft is parallel to the central line of the light path of the space coronagraph, first bearing assemblies are arranged on bearing positioning steps at two ends of the worm, second bearing assemblies are arranged on bearing positioning steps at two ends of the worm gear shaft, the worm gear shaft comprises a locking end and a positioning end, an output shaft of the speed reducing motor is connected with an input end of the worm through a first coupler, and the optical fiber fixing rod is fixedly installed at the locking end of the worm gear shaft, the optical fiber connector is fixedly arranged on the optical fiber fixing rod;
the positioning device comprises a V-shaped groove positioning block and an encoder, the encoder is fixedly mounted at the positioning end of the worm gear shaft through a second coupler, the V-shaped groove positioning block is fixedly mounted on the base, a V-shaped groove of the V-shaped groove positioning block is used for positioning an optical fiber fixing rod, and when the side face of the optical fiber fixing rod is pressed in the V-shaped groove, the axis of the optical fiber connector is collinear with the central line of the optical path of the space coronagraph;
wherein:
in a self-correcting mode, the speed reducing motor is started, the speed reducing motor drives the worm and the worm wheel to rotate, the worm wheel shaft and the worm wheel synchronously and coaxially rotate, the optical fiber fixing rod is driven by the worm wheel shaft to rotate towards the direction of the V-shaped groove positioning block, the encoder determines the position of the optical fiber fixing rod by detecting the rotation angle of the worm wheel shaft, when the rotation angle detected by the encoder is consistent with a calibration angle, the speed reducing motor is closed, the side face of the optical fiber fixing rod is pressed in the V-shaped groove, the axis of the optical fiber connector is collinear with the central line of a space coronagraph light path, and output light of the self-correcting light source enters the space coronagraph light path;
in an observation mode, the speed reducing motor is turned off, the optical fiber fixing rod is located at a position completely separated from the optical path of the space coronagraph, and starlight enters the optical path of the space coronagraph.
2. The dual-mode switching system for the space coronagraph according to claim 1, wherein the position of the optical fiber fixing rod corresponding to the zero position of the encoder is a position where the optical fiber fixing rod is completely separated from the optical path of the space coronagraph, the rotation angle is an angle by which the worm-wheel shaft is rotated relative to the position corresponding to the zero position of the encoder, the calibration angle is larger than a standard rotation angle, and the standard rotation angle is an angle by which the worm-wheel shaft is rotated from the position corresponding to the zero position of the encoder to a position where the side surface of the optical fiber fixing rod is contacted in the V-shaped groove.
3. The dual mode switching system for space coronaries according to claim 1, wherein quick-change connectors are provided at both ends of the optical fiber between said isolator and the self-calibrating light source.
4. The dual mode switching system for space coronaries according to claim 1, wherein said self-calibrating light source switching device has 2 of said self-calibrating light sources.
5. The dual mode switching system for space coronagraphs of claim 1, wherein the fiber securing lever is fixedly mounted at the locking end of the worm-wheel shaft by fasteners.
6. The dual mode switching system for space coronagraphs of claim 1, wherein the surfaces of the worm, worm gear shaft, first bearing assembly and second bearing assembly are all coated with a molybdenum disulfide coating.
7. The dual-mode switching system for space coronaries according to claim 1, wherein the outer surfaces of said optical path switching means and said positioning means are coated with a black coating.
8. Switching method of a dual-mode switching system for space coronaries, according to claim 1, characterized by comprising the following steps:
the method comprises the following steps that firstly, an encoder acquires information of a zero position, a standard rotation angle and a calibration angle;
step two, the gear motor drives the worm wheel shaft to rotate to a position of a calibration angle, and the self-calibration light source switching device introduces output light of different self-calibration light sources into a light path of the space coronagraph;
and step three, after the light path calibration of the space coronagraph is finished, the speed reducing motor drives the worm wheel shaft to rotate to the zero position, and the starlight enters the light path of the space coronagraph.
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| US20180058922A1 (en) * | 2016-09-01 | 2018-03-01 | U.S.A. As Represented By The Administrator Of The National Aeronautics And Space Administration | Spherical occulter coronagraph cubesat |
| US10338371B1 (en) * | 2018-06-29 | 2019-07-02 | Glenn Arthur Morrison | Space telescope with beam steering objective |
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| CN1444065A (en) * | 2002-03-11 | 2003-09-24 | 帝人制机株式会社 | Optical path switching-over device |
| CN103399401A (en) * | 2013-07-15 | 2013-11-20 | 北京理工大学 | Wavefront error correction system and method for inhibiting speckle noises of coronagraph system |
| US20180058922A1 (en) * | 2016-09-01 | 2018-03-01 | U.S.A. As Represented By The Administrator Of The National Aeronautics And Space Administration | Spherical occulter coronagraph cubesat |
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