13 results about "Coronagraph" patented technology

The invention discloses a few-sample coronagraph mass projection segmentation method and system based on low-rank adaptation, and belongs to the technical field of coronagraph mass projection segmentation, and the method comprises the steps: obtaining a white-light coronagraph image sequence, carrying out the differential fusion processing, generating a multi-channel fusion image, and carrying out the segmentation of the multi-channel fusion image; inputting the coronal mass into a visual basic segmentation model subjected to low-rank adaptation for segmentation to obtain a segmentation mask of coronal mass ejection; wherein the visual basic segmentation model carries out parameter fine tuning on a pre-trained image encoder by using a few-sample data set containing coronal mass ejection marks through a low-rank matrix decomposition mode; in the fine tuning process, original weights of the image encoder and the prompt encoder are frozen, and a trainable low-rank adaptation layer is inserted into the image encoder; image-level labels are determined based on the segmented mask of coronal mass ejection. According to the method, high-quality CME segmentation is realized under a small amount of annotation data, and the calculation and manual annotation cost is reduced.

The application discloses a low-rank adaptation-based few-shot coronal mass ejection segmentation method and system, and belongs to the technical field of coronal mass ejection segmentation. The low-rank adaptation-based few-shot coronal mass ejection segmentation method comprises the following steps: acquiring a white light coronagraph image sequence and performing differential fusion processing to generate a multi-channel fusion image, inputting the multi-channel fusion image into a low-rank adaptation-based visual basic segmentation model for segmentation, and obtaining a coronal mass ejection segmentation mask; wherein the visual basic segmentation model uses a low-rank matrix decomposition method to fine-tune the parameters of a pre-trained image encoder using a few-shot dataset containing coronal mass ejection labels; the original weights of the image encoder and the prompt encoder are frozen during the fine-tuning process, and a trainable low-rank adaptation layer is inserted into the image encoder; and the image-level label is determined based on the coronal mass ejection segmentation mask. The application realizes high-quality CME segmentation under a small amount of labeled data, and reduces the calculation and artificial labeling costs.

This utility model discloses a loop heat pipe cooling system for a coronagraph, including an equipment mounting plate, a heat collection plate, a main loop heat pipe evaporator, and a backup loop heat pipe evaporator. The equipment mounting plate and the heat collection plate are connected by channeled heat pipes. Several discrete heating devices are mounted on the equipment mounting plate. The outer surface of the heat collection plate has a main evaporator mounting surface and a backup evaporator mounting surface. The main loop heat pipe evaporator is mounted to the heat collection plate via the main evaporator mounting surface, and the backup loop heat pipe evaporator is mounted to the heat collection plate via the backup evaporator mounting surface. The cooling system of this utility model features a backup evaporator design, which improves the on-orbit reliability of the loop heat pipe system. Redundancy is used to address potential failure risks. The system is equipped with two loop heat pipe evaporators connected to the heat source mounting surface, meeting special requirements such as good thermal conductivity of the evaporator mounting surface, temperature uniformity, and a small temperature difference between the main and backup mounting surfaces.

The invention discloses a coronagraph deformable mirror actuator dead pixel interference analysis method and system. The method comprises the following steps: constructing a coronagraph high-contrast imaging system framework; measuring the obtained defective pixel position information of the deformable mirror actuator, and fixing the defective pixel position information in an actuator control matrix; establishing a phase modulation control system based on an SPGD algorithm; establishing a convolution model with interferences among the actuators; the dead pixels are introduced into a dark space optimization process, and when dark space optimization is carried out through an SPGD algorithm, a system monitors key indexes of each quadrant dark space and observes the influence degree of the dead pixels on the dark space optimization process. Amplitude modulation is achieved through the focal plane modulation optical filter, the contrast ratio of the image plane reaches 10 <-6 > magnitude, phase modulation, namely dark space optimization, is achieved through the thousand-unit deformable mirror, and the contrast ratio reaches 10 <-8 > magnitude through the SPGD modulation algorithm; the dead pixel influence is introduced into the dark space optimization process, and the coupling influence of the dead pixel on the adjacent actuator is analyzed.

The invention discloses an extrasolar planetary imaging coronagraph structure with a detection function, the extrasolar planetary imaging coronagraph structure comprises a main frame, and an optical assembly, a visible light imaging camera, a high-order wave aberration correction box, a wavefront detection camera, a scientific data processing electric box and a tilt correction box which are mounted in a sealed cavity in the main frame, and the optical assembly is provided with a light inlet hole. According to the invention, the main frame is made of a high-strength carbon fiber composite material, and through optimized mechanical architecture design and material combination, the structural strength is obviously improved on the basis of light weight, larger load and a harsh working environment can be borne, rigid body displacement or deformation of an internal optical instrument is prevented, and the service life is prolonged; meanwhile, innovative materials and structural design of the pre-embedded aluminum bee layer are adopted, the overall weight is greatly reduced on the premise that the functional integrity is guaranteed, material consumption is effectively reduced, and the installation efficiency of the product is improved; it is guaranteed that the coronagraph structure and internal components can bear the dynamic environment when a rocket is launched.

The invention relates to a coronagraph optical system, in particular to a light and small type triple imaging coronagraph optical system, and solves the technical problem that an existing coronagraph optical system is large in overall size. The three-time imaging design is adopted, three-time imaging is achieved through the front objective lens set, the first relay unit and the second relay unit, the folding-axis mirrors are arranged at the focal plane positions of the front objective lens set and the first relay unit respectively, the inner blindage is arranged in the mode that holes are formed in the centers of the two folding-axis mirrors so that solar beams can be filtered out, the overall size of the system can be compressed, and the overall size of the system can be reduced. The miniaturization of the system is realized; meanwhile, LYOT diaphragms are arranged on the first relay unit and the second relay unit respectively, stray light suppression of the system can be achieved, and meanwhile miniaturization of the system is further achieved.

The invention discloses an annular pupil modulation high-contrast coronagraph transmittance smooth design and a working method. According to the method, circular radial transmittance gradient modulation is carried out on the pupil of the telescope, and suppression of strong diffraction light of a fixed star is realized. According to the pupil modulation design concept with the gradually-changed circular ring band transmittance, limited circular rings are adopted, the transmittance of each circular ring is the same, energy distribution of a fixed star at the pupil position of an optical system is changed by further restraining the transmittance difference between the adjacent circular rings, and the optimal high-contrast imaging performance is achieved. According to the modulation band, the transmittance design curve of the modulation band is integrally smooth by restraining the transmittance difference of adjacent bands, the manufacturing process problem caused by violent transmittance jump of a traditional optical filter can be solved, the machining precision is further guaranteed, and the problems of wavefront phase jump and the like caused by sudden change of the thickness of a film layer can be solved; and the high-contrast imaging performance of the whole system is finally improved.

The application discloses a kind of high contrast imaging wave front detection and correction method and system, this method uses FPGA and CPU hybrid programming architecture to realize high-precision high contrast imaging wave front detection and correction, locking is realized to high contrast imaging dark area in closed-loop correction, wherein, high-precision wave front slope calculation is completed in FPGA, sub-aperture image division and wave front recovery calculation are realized in CPU, and voltage control deformable mirror correction wave front aberration is output.The application uses hybrid programming architecture to carry out high contrast imaging wave front detection and correction, realizes high-precision wave front detection and correction, solves the problem of insufficient performance of CPU for aerospace, and then realizes the locking of high contrast imaging dark area of space coronagraph, for direct imaging detection of exoplanet.After wave front detection and correction, the energy stability of high contrast imaging dark area can be guaranteed, and dark area locking is completed.

The application provides a high-contrast polarization imaging system for direct imaging of exoplanets, which comprises a coronagraph system, a relay lens, a polarization modulation assembly based on phase modulation, an imaging lens and a detector. A polarimeter is introduced on the basis of the coronagraph system, a liquid crystal phase retarder is used as a modulation device, different intensity values are obtained by applying different voltages, and finally the Stoeks parameter is inverted. In view of the fact that the planet light has certain polarization characteristics and the star light has no polarization characteristics, the planet light can be distinguished from the star light after passing through the high-contrast polarization imaging system, and high-contrast polarization imaging is realized. Meanwhile, the system introduces a Wollaston prism to form a double light path, so as to reduce the influence of atmospheric turbulence, and meanwhile, additional contrast gain can be obtained, and an imaging contrast gain of about 100 times can be realized.

The present application relates to the field of astronomical, space science and solar observation coronagraph instrument, especially relates to a kind of external mask type image stabilization coronagraph, it includes in turn: external mask, heat rejection mirror, objective lens group, field stop, field lens, Lyot diaphragm, image converter group and linear polarizer, it further includes: image stabilization device, the image stabilization device includes: image stabilization lens group, guide mirror and image stabilization lens adjusting mechanism, wherein, the image stabilization lens group is located between objective lens group and field stop;The guide mirror is set to the incident light path direction parallel to external mask outside external mask, for collecting solar azimuth and solar elevation angle optical signal, obtains solar pointing deviation signal;The image stabilization lens adjusting mechanism is based on solar pointing deviation signal, adjusts the pose of image stabilization lens group, to compensate solar pointing deviation.The present application combines high-precision imaging and image stabilization technology organically, significantly improves the observation performance of coronagraph, provides reliable technical support for the research of solar activity and coronal structure.

The invention discloses a coronagraph near-infrared unit vacuumizing system which comprises a vacuum Dewar, a vacuum chamber valve, a roughing pump unit system, a main pump unit system and a control system. The vacuum Dewar is connected with the roughing pump unit system and the main pump unit system through the vacuum chamber valve and the three-way switching valve, and the three-way switching valve enables the vacuum Dewar to switch the connection state between the roughing pump unit system and the main pump unit system. The rough pump unit system and the main pump unit system are respectively composed of a plurality of pipelines, valves and pumps, and are used for extracting air from the vacuum Dewar to enable the vacuum Dewar to reach a preset vacuum degree; the control system collects the vacuum degree numerical value of the vacuum Dewar and controls the vacuum chamber valve and the opening and closing of all valves and pumps in the roughing pump unit system and the main pump unit system; based on a mechanical pump, a molecular pump and an electrical control system, the technical design of a multi-station, automatic operation and oil-free high-vacuum system is realized.

An occulting assembly for use with a telescope or other imaging instrument when viewing the sun or other bright light source. An occulting disk is supported by a set of thin stiff truss rods. These truss rods are attached to the dark side of the adapter at one end and to an adapter at the other end. The adapter provides a mechanical interface to the telescope or other imaging instrument and has an aperture piece that defines an aperture in its center. The occulting disk is sized to completely shadow the aperture and the truss is arranged so that it is within the shadow of the occulting disk.

Imaging systems and associated imaging methods are described. One example imaging system includes a lens positioned to receive a light associated with a scene, and a first spatial mode sorter positioned along an optical path to receive the light from the lens and to demultiplex the incident light incident. The imaging system also includes an occulting mask, and a second spatial mode sorter. The occulting mask is positioned between the first spatial mode sorter and the second spatial sorter to inhibit one or more predetermined modes of the first multiplexed light from propagating towards the second spatial sorter, the second spatial mode sorter is configured to recombine light received thereon to produce an output light for detection by an imaging detector, the output light allows for detection by the imaging detector of features in the scene that are separated by a distance that is below a Rayleigh diffraction limit.