7 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 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.

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.