ALL-FIBER OPTICAL VORTEX LASER BASED ON RESONANCE OF ORBITAL ANGULAR MOMENTUM MODES

    公开(公告)号:US20210257804A1

    公开(公告)日:2021-08-19

    申请号:US17266114

    申请日:2018-10-31

    Abstract: Disclosed is an all-fiber optical vortex laser based on resonance of orbital angular momentum modes. The all-fiber optical vortex laser has an annular cavity structure, and includes a narrow-linewidth pump laser, an optical amplifier, an orbital angular momentum mode generator, a first polarization controller, an optical fiber circulator, an optical fiber coupler, a second polarization controller and a vortex optical fiber. The orbital angular momentum mode generator (3) realizes directional conversion from a fundamental transverse mode in a single-mode optical fiber into an orbital angular momentum mode with a specific topological charge in a vortex optical fiber. The optical fiber coupler can realize directional coupling from an orbital angular momentum mode in one vortex optical fiber to an orbital angular momentum mode in another vortex optical fiber; the vortex optical fiber is an optical fiber supporting stable transmission of an orbital angular momentum model.

    Finger reading method and device based on visual gestures

    公开(公告)号:US11087637B2

    公开(公告)日:2021-08-10

    申请号:US15117948

    申请日:2014-12-03

    Abstract: A finger reading method and device based on visual gestures. A user makes a circle on a required finger reading region on a book by using a finger; a camera captures the circle making action of the finger, and an image processing module acquires the position a fingertip according to a profile analysis algorithm, acquires the endpoints of the track edge in upper, lower, left and right directions, and fits a rectangle according to the upper, lower, left and right end points in order to identify content such as characters or graphs of rectangular region content. A voice synthesis technology is performed. Voice information is fed to the user to realize a finger reading functions. The device can be worn on the head of the user, and includes camera and bone conduction earphones arranged on both sides thereof.

    Hollow porous spherical particle artificial bone as well as preparation method and application thereof

    公开(公告)号:US11077225B2

    公开(公告)日:2021-08-03

    申请号:US16725861

    申请日:2019-12-23

    Inventor: Jiandong Ye Fupo He

    Abstract: The disclosure provides a preparation method of a hollow porous spherical particle artificial bone. The method comprises: (1) uniformly mixing bioceramic powder, bioglass powder and an excipient to obtain a solid-phase mixture, then adding binder solution to the solid-phase mixture, and uniformly mixing to obtain a plastic wet material; (2) loading a plastic wet material into an extrusion device of an extrusion rounder to be extruded by the orifice plate of the extrusion device to form a strip-shaped material; (3) putting the strip-shaped material into the spheronization device, cutting, and then spheronizing to form spherical particles; and (4) placing the spherical particles into a furnace, debinding, removing the excipient and the binder, and then sintering at 750-1550° C.

    Isodiketopyrrolopyrrole dye and use thereof

    公开(公告)号:US11056287B2

    公开(公告)日:2021-07-06

    申请号:US15747766

    申请日:2015-12-31

    Abstract: The present invention discloses an isodiketopyrrolopyrrole dye and use thereof. A series of pure organic dye based on isodiketopyrrolopyrrole are synthesized in the present invention, using 4,4′-dihexyloxytriphenylamine as an electron donor, isodiketopyrrolopyrrole as a π-bridge, and cyanoacetic acid as an electron acceptor and an anchoring group, and with a alkyl chain introduced on an isodiketopyrrolopyrrole group. The types of dyes have a relatively good light-harvesting performance as well as a relatively large steric hindrance, and they are not easy to gather while being absorbed on a semiconducting film. The pure organic dye with isodiketopyrrolopyrrole as an electronic π-bridge, which is used in a dye-sensitized solar cell, has a good ability of inhibiting the recombination of electrons, and the dye-sensitized solar cells have a high photoelectric conversion efficiency.

    INTELLIGENT IDENTIFICATION COOKING SYSTEM FOR OVEN

    公开(公告)号:US20210186262A1

    公开(公告)日:2021-06-24

    申请号:US17053693

    申请日:2018-10-25

    Abstract: intelligent identification cooking system of an oven including an image acquisition system, an image analysis and processing system, and a temperature measurement and monitoring system The image acquisition system is connected to the image analysis and processing system and an intelligent menu control system is connected to the image analysis and processing system and the temperature measurement and monitoring system respectively. Through computer vision and identification technology and temperature sensing technology, parameters such as the type, thickness, size, fattiness and temperature are identified and automatically matched and calibrated to a cooking menu. A control program is output to a control terminal and executed

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