9 results about "Cathode ray tube" patented technology

The present invention provides a multi-directional connection hub including a plurality of openings to which an anode adapter made of a metal material is connected through an insulation tube and an electron gun which emits electrons to the anode adapter to generate X-rays is connected, wherein the openings include a plurality of side openings to which the electron gun is connected and an upper opening through which the X-rays generated by the electrons, which are provided from the electron gun through the side opening and collide with the anode adapter, are emitted, and an emission direction of the X-rays is changed toward another side opening of the plurality of side openings or the upper opening according to a type of the anode adapter and a type or installation location of the electron gun.

The invention discloses a lattice password rapid calculation method and system based on composite analog-to-digital number theory transformation. The method comprises the following steps: firstly, performing modular reduction on a polynomial based on a Fermat prime number and an NTT friendly prime number, then converting the polynomial into a point value form, performing point-by-point multiplication on modular polynomial point value representation under the same modulus, further executing inverse transformation, and reconstructing a target polynomial based on CRT (cathode ray tube) to obtain a calculation result. According to the method, the NTT and FNT combined mode is adopted, loop polynomial multiplication calculation is accelerated, and meanwhile the problem that in the prior art, the FNT or NTT technology cannot be directly applied due to the fact that the modulus of an inge cryptographic algorithm does not meet the requirement is effectively solved.

The invention provides a microchannel plate for cathode electron self-focusing in a photocathode X-ray tube and a use method. A micro-channel plate is applied to the technical field of high-performance X-ray tubes, a substrate is a physical substrate of the micro-channel plate and is of a Fresnel lens structure, and the substrate is provided with a plane incident plane and a distorted surface output plane formed by concentric annular belts; a gradient aperture array is distributed on the substrate, and the gradient aperture array is arranged on the plane of the substrate; the radial gradient material is a surface functional coating of the inner wall of the micro-channel; the variable aperture channel is an inner wall surface three-dimensional contour of each independent micro-channel forming the gradient aperture array, and each independent micro-channel in the gradient aperture array is defined. Different secondary electron emission materials are coated on the surface of the inner wall of each micro-channel defined by the gradient aperture array in a partitioned manner along the radial direction. In this way, the problems that in the prior art, an X-ray tube is loose in structure and poor in performance can be solved.

The invention relates to the field of power supply terminal management, is used for solving the problem of lack of a technical scheme capable of simultaneously deconstructing a power supply operation effect in dynamic and instantaneous multi-dimension and multi-parameter angles in the prior art, and particularly relates to a safety monitoring method and system for a negative high-voltage power supply terminal of a thermionic cathode X-ray tube. Comprising a multi-source data monitoring module, a data slice analysis module, a dynamic series analysis module, an operation situation judgment module and an early warning output module. According to the method, the data is primarily processed in an edge calculation mode, the processed data is returned and then is further analyzed, edge and cloud collaborative processing is realized, data processing benefits are improved, analysis is carried out on two different dimensions including an instantaneous dimension and a dynamic dimension through different analysis modes, and the data processing efficiency is improved. And synchronous analysis is carried out on different parameters, so that operation safety monitoring analysis of different dimensions and different parameter angles is realized, and the comprehensiveness and accuracy of safety monitoring of the negative high-voltage power supply terminal are improved.

A cathode-ray ultraviolet light source comprising: an elongated glass envelope having a first end and second end, the glass envelope defining an evacuated volume; an electron gun positioned within the evacuated volume proximate to the first end and being capable of developing an electron beam; a target disposed within the evacuated volume between the first and second end of the glass envelope, the target comprising a phosphor material covered with a reflective metal film; and an electron beam focusing and deflecting mechanism disposed within the evacuated volume between the electron gun and the target to direct the electron beam towards the reflective metal film of the target.

This invention provides a microchannel plate for cathode electron self-focusing in photocathode X-ray tubes and its usage method. Applied to the field of high-performance X-ray tube technology, the substrate is the physical base of the microchannel plate, configured as a Fresnel lens. The substrate has a planar incident surface and a deformed output surface composed of concentric rings. A gradient aperture array is distributed on the substrate, arranged on the plane of the substrate. A radial gradient material is a surface functional coating on the inner wall of the microchannel. Variable aperture channels are the three-dimensional contours of the inner wall surface of each independent microchannel constituting the gradient aperture array, defining each independent microchannel in the gradient aperture array. Different secondary electron emission materials are coated radially on the inner wall surface of each microchannel defined by the gradient aperture array. This method solves the problems of loose structure and poor performance in existing X-ray tubes.

The application discloses a cold cathode X-ray tube and an imaging device thereof, and relates to the field of field emission technology. The cold cathode X-ray tube comprises a vacuum tube shell, a cold cathode field emitter encapsulated in the vacuum tube shell and used for emitting an electron beam, a control grid arranged in front of the cold cathode field emitter and used for controlling the on-off and initial intensity of the electron beam, an electrostatic deflection system arranged at one end of the control grid away from the cold cathode field emitter and used for generating an electrostatic field to cause the electron beam emitted through the control grid to be deflected by a set angle, an anode target arranged on a bombardment path of the deflected electron beam to generate X-rays through bombardment of the electron beam, and an X-ray emission window arranged on one side of the anode target and capable of emitting the generated X-rays. The cold cathode X-ray tube and the imaging device thereof have the advantages that the cathode has a long service life, the electron beam is stable and controllable, and the equipment has a small size.

The application discloses an electron acceleration structure and method for a photocathode X-ray tube, and relates to the technical field of X-ray tube electron acceleration, which comprises a photocathode, an anode target, and a plurality of ring-shaped acceleration electrodes arranged in sequence along the electron movement direction and arranged between the photocathode and the anode target; each ring-shaped acceleration electrode is provided with a central through hole for the electron beam to pass through, and the diameter of the central through hole is greater than the diameter of the electron beam at the corresponding position; each potential node is increased along the electron movement direction, the voltage difference of each preceding stage is configured according to the same set voltage difference, and the voltage difference of the last stage is less than the same set voltage difference; the photocathode emits an electron beam under laser irradiation, the electron beam sequentially passes through the central through hole and obtains energy in the multi-stage continuous acceleration area, and then hits the anode target. The structure and method can reduce the single-stage voltage difference and the local electric field strength, inhibit gas ionization and electric breakdown, and significantly improve the high-voltage operation stability of the photocathode X-ray tube.

The invention belongs to the technical field of radiation imaging detection, and particularly discloses a cold cathode X-ray vehicle detection emission box and an optical arrangement method thereof. The emission box comprises an emission box shell, an emission unit and an X-ray source. According to the X-ray source, the cold cathode X-ray tube and the high-voltage part of the high-voltage power supply module are integrally immersed in the high-voltage insulating oil, natural heat dissipation is achieved through the emission box shell, and the structure is compact and reliable. And a replaceable optical filter assembly and a lead shielding lining are arranged in the transmitting unit, so that the safety and the flexibility are ensured. By designing the sizes and positions of the light guide strip and the light outlet aperture, the light guide strip and the light outlet aperture are accurately matched with the geometric parameters and the preset coverage range of the target lane. The invention further provides an optical arrangement method, according to parameters such as lane width and detector height, the installation position and size of each component are accurately determined through geometric calculation, accurate projection of X-ray beams is achieved, scattering is effectively reduced, and the imaging quality is remarkably improved while radiation safety is guaranteed.