18 results about "Cold cathode" patented technology

This invention discloses a novel welding machine, comprising: a welding frame, the welding frame including a support frame, a sealed door on the front of the support frame, a welding chamber at the upper end of the inner cavity of the support frame, and a welding table at the bottom of the inner cavity of the welding chamber. This invention belongs to the field of welding machine technology. The purpose of this invention is to solve the problems of traditional hot cathode electron beam welding machines in the prior art, where the hot cathode requires continuous preheating, has a long start-up time, and still needs to maintain a high temperature in standby mode. The technical effect achieved is: using a directional carbon nanotube array microbeam emitter as a cold cathode, utilizing the field emission principle of carbon nanotubes, an electric field is applied between the grid and the cathode to allow electrons to escape from the tip of the carbon nanotube through quantum tunneling effect, without heating the cathode to a high temperature, achieving millisecond-level instantaneous start-up, solving the drawback of traditional welding machines requiring 5-10 minutes of preheating, and significantly improving work efficiency and equipment response speed.

This application relates to the field of cold cathode field emission material preparation technology, and discloses a method for preparing a graphene-diamond composite structure to improve the field emission performance of diamond. The method involves first dispersing nanodiamonds and graphene oxide in a deep eutectic solvent; then adding boric acid to induce an in-situ sol-gel transformation under heating, forming a gel network that locks the dispersed phase; followed by microwave-assisted interface activation and gradient high-temperature carbonization, and finally cleaning and drying to obtain the product. This invention effectively suppresses phase separation and agglomeration during pyrolysis through a gel solidification mechanism, and utilizes the deep eutectic solvent and boric acid pyrolysis to achieve in-situ co-doping of nitrogen and boron, constructing a low-barrier continuous conductive channel on the diamond surface, and realizing tight electrical interconnection between components. This method is simple and controllable, and the resulting composite material possesses excellent conductivity, low turn-on electric field, and high emission stability, thus improving the electron emission efficiency of cold cathode devices.

This invention belongs to the field of non-destructive testing equipment technology, and specifically relates to a cold cathode X-ray flaw detector for pipelines. It includes a cold cathode X-ray emitting module and a pipeline crawler. The bottom end of the cold cathode X-ray emitting module is fixedly connected to the top end of the pipeline crawler. A heat insulation box is fixedly connected to the top end of the pipeline crawler, and a temperature regulating mechanism is fixedly connected to the inner wall of the heat insulation box. A rectangular mounting hole is opened at the top end of the heat insulation box, and a U-shaped block is fixedly connected to the wall of the rectangular mounting hole. A support rod and a pad are fixedly connected to the inner wall of the U-shaped block. This invention enables the cold cathode X-ray flaw detector to not only have temperature regulation and limiting functions to prevent displacement of the pipeline crawler, but also improves the cold cathode X-ray flaw detector's resistance to harsh environments, further enhancing the reliability of the cold cathode X-ray flaw detector's operation and the accuracy of the test results. It can meet the needs of non-destructive testing of large-size pipeline welds in different seasons.

The embodiment of the application relates to the technical field of security inspection, and discloses a cold cathode X-ray luggage security inspection instrument, a control method and a program product; the security inspection instrument comprises a cold cathode X-ray source and a conveying unit; the method comprises the following steps: acquiring load data and shape size data of a detected object, and monitoring conveying speed of the conveying unit in real time; calculating an equivalent density parameter of the detected object according to the load data and the shape size data; determining basic working parameters of the cold cathode X-ray source according to the equivalent density parameter; adjusting a negative secondary high-voltage amplitude in a negative secondary high-voltage circuit; simultaneously adjusting an output amplitude of a positive high-voltage circuit; performing dynamic exposure compensation on the cold cathode X-ray source according to the conveying speed; adjusting a duty cycle of a positive high-voltage output in the positive high-voltage circuit in real time; during beam emission of the cold cathode X-ray source, collecting high-energy signals and low-energy signals penetrating through the detected object, and generating an X-ray image, so that imaging quality is ensured, and device power consumption is significantly reduced.

This invention relates to a method and device for fabricating a curved cold cathode X-ray source, achieving better process compatibility, more precise curvature, and a more precise and compact structure. The fabricated curved cold cathode X-ray source includes: a curved anode substrate, a curved cathode substrate, and an insulating isolator; the curved anode substrate includes a curved anode base and a metal anode target disposed on the curved anode substrate; the curved cathode substrate includes a curved cathode base, a cathode electrode disposed on the curved cathode base, a cold cathode emitter array disposed on the cathode electrode, an insulating layer, and a gate electrode disposed on the insulating layer; the metal anode target is fixedly connected to one side of the insulating isolator, and the cathode electrode is fixedly connected to the other side of the insulating isolator.

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.

This invention discloses an explosive wire detonator initiation system and method, relating to the field of pyrotechnic initiation measurement and control technology. The system includes an integrated controller and a high-current drive board. The integrated controller is connected to the high-current drive board via a high-voltage cable and is configured to provide the high-current drive board with DC high voltage and trigger pulses, and to receive and process signals fed back from the high-current drive board. The output end of the high-current drive board is connected to the explosive wire detonator via an initiation cable and is configured to instantaneously release stored energy to the explosive wire detonator to complete the initiation when preset conditions are met. This invention uses a gas discharge tube instead of a traditional cold cathode tube as the main switching device and integrates a self-made current sampling unit and a synchronous output unit inside the high-current drive board, significantly reducing the overall system cost and improving the convenience of on-site operation and experimental efficiency.

The application discloses a preparation method of a carbon nanotube / perovskite composite structure cold cathode. First, carbon nanotube slurry is prepared through an audio frequency resonance technology, then the dispersed slurry is transferred to a preprocessed conductive substrate through a patterning process to obtain a carbon nanotube array structure. Then, an inorganic cesium lead halide perovskite polycrystalline thin film is prepared on the carbon nanotube array structure by using a continuous vapor deposition method, so that a carbon nanotube / perovskite composite structure cold cathode emitter with a lower work function is obtained, and the field emission performance is greatly improved. The cold cathode slurry is prepared through the audio frequency resonance technology, and the carbon nanotube / perovskite composite structure cold cathode is prepared by combining the continuous vapor deposition technology, so that a low-cost, high-efficiency and high-performance cold cathode emitter preparation method is provided.

The application provides a carbon nanotube cold cathode, a preparation method thereof and an X-ray tube. The preparation method comprises the following steps: ball milling agglomerated carbon nanotubes to obtain carbon nanotube powder; mixing the carbon nanotube powder with a first solvent and an electrolyte solution, and then performing ultrasonic oscillation to obtain a suspension; placing a metal substrate in the suspension to perform electrophoretic deposition, thereby obtaining a carbon nanotube film cold cathode; coating a curing agent on the carbon nanotube film cold cathode to perform cross-linking and curing, thereby obtaining a cured carbon nanotube cold cathode; using a high-energy ion beam to form a tip of the carbon nanotube in the cured carbon nanotube cold cathode; and using a high-strength electric field to make the carbon nanotube stand upright, thereby obtaining an activated carbon nanotube cold cathode.

The application relates to the technical field of ray detection, and particularly discloses a cold cathode ray machine digital control system based on high-frequency inversion and pulse modulation, which specifically comprises a master control module and a calculation module, a high-frequency high-voltage inversion and modulation module, a pulse driving and field emission control module, a precision sensing and acquisition module, a safety interlocking and state monitoring module, and a man-machine interface and communication module. The application first proposes a closed-loop control scheme of high-frequency inversion, pulse modulation and cathode state, solves the problem of the independent operation of traditional system power supply, control and emitter, and realizes cross-module collaborative optimization.

This invention relates to a method and device for fabricating an X-ray source, enabling the localized fabrication of nanocold cathodes on cathode substrates of different shapes and materials. The uniform emission of high current over a large area by the X-ray source depends on the controllable growth of nanocold cathodes on the X-ray cathode. The X-ray source cathode comprises: a cathode substrate, a conductive layer on the cathode substrate, a growth source film on the conductive layer, and a nanocold cathode in a stress-controlled region of the growth source film.

This application provides a carbon nanotube material for a cold cathode, a method for preparing the same, and an electron emission device. The method for preparing the carbon nanotube material includes: preparing a catalyst using a transition metal; placing the catalyst in a high-temperature reaction chamber and reducing the catalyst at a first temperature; introducing a carbon source gas into the high-temperature reaction chamber and causing the carbon source gas to decompose under the action of the catalyst at a second temperature, thereby growing a first carbon nanotube mixture; increasing the temperature in the high-temperature reaction chamber and subjecting the first carbon nanotube mixture to high-temperature purification at a third temperature; selecting a portion of the obtained product to obtain a second carbon nanotube mixture; and purifying and drying the second carbon nanotube mixture to obtain the carbon nanotube material.

A production method for producing an anode for a cold cathode X-ray source, including the following steps: producing an element referred to as target from a first material adapted to generating X-rays from the absorption of an electron beam, the first material having a first thermal expansion coefficient Ce,1(Tu) at a predetermined temperature Tu of use of the anode in the X-ray source, producing an element referred to as target support from a second material having a second thermal expansion coefficient Ce,2(Tu) at the predetermined temperature Tu, joining the target to the target support by hard soldering using a solder material at a soldering temperature higher than the predetermined temperature Tu and higher than a melting point of the solder material, so as to form a film of solder interposed between the target and the target support.

The application belongs to the technical field of vacuum electron devices, and relates to a magnetic focusing system, and particularly provides a miniaturized permanent magnetic focusing system of a cold cathode electron gun, to solve the problems of the oversized size, difficult heat dissipation, complex structure, and difficult processing of a traditional permanent magnetic system and an electromagnetic focusing system under the increasingly miniaturized trend of a terahertz band vacuum electron device. The permanent magnetic focusing system is designed by using a magnetic material, the peak strength of the magnetic field in the electron channel is ensured by a main magnet, the magnetic field strength on the surface of the frustum-shaped cold cathode carrier is enhanced by combining two pole shoes and a guide magnet, and the length of the uniform region of the magnetic field in the electron channel is prolonged, so that a long enough strong magnetic field region is ensured to meet the condition that the electron beam enters the collecting cavity after fully interacting with the high-frequency field. In summary, the application provides the miniaturized permanent magnetic focusing system of the cold cathode electron gun, which has the advantages of compact structure, stable performance, easy assembly, low cost, and the like, and is beneficial to batch processing and manufacturing.

This invention discloses a low-temperature preparation technology for plasma-assisted hydrothermal synthesis of carbon nanotubes and its application in the field of cold cathode technology. It relates to the fields of carbon nanotube preparation and cold cathode technology, including the construction of a reaction system containing a catalyst precursor and a carbon source, and a hydrothermal reaction: the catalyst precursor is a phosphorus-free core-shell Ni-Mo-ammonium citrate complex, formed by nickel nitrate, sodium molybdate, and ammonium citrate in the order Ni... 2+ :MoO4 2‑ The reaction is carried out with a citrate molar ratio of 3:1:1.2. In this invention, phosphorus residue and catalyst agglomeration are eliminated by using a phosphorus-free core-shell catalyst, combined with a composite heteroatom source and ultrasonic-stirring dispersion process, and a three-stage pulsed plasma reaction at ≤190℃. This optimizes the quality of carbon nanotubes, eliminates the need for acid washing / annealing, and is compatible with flexible substrates. The cold cathode is fixed by a modified PET substrate and a metal-free transition layer, ultimately achieving a 1×10⁻⁶ reaction. ‑4 Achieving an on-state electric field ≤1.8V / μm, a threshold electric field ≤4.2V / μm, and a current density stability ≥90% under Pa conditions, this technology solves the problems of carbon nanotube quality, cost, substrate compatibility, and cold cathode performance in traditional technologies.

This invention relates to a timing and synchronization control system for the SPERF device, belonging to the field of space plasma environment simulation and research technology. The invention aims to meet the time requirements of space plasma environment simulation experiments and the synchronization requirements of the trigger modes of various sub-devices. The trigger source of this invention is used to set the delay time and pulse width of the trigger output signals of delay generators A through F respectively. Delay generator A is used to set the delay time of the magnet power supply, cold cathode source, and plasma gun respectively. Delay generators B and C are both used to set the delay time of the acquisition system. Delay generators D and E are both used to set the delay time and pulse width of the gas filling system. Delay generator F is used to set the delay time and pulse width of the 2.45G ECR source. This invention allows for adjustment of the start time and duration of sub-device operation, meeting the experimental requirements of the space plasma environment simulation chamber.

This invention relates to a graded capacitor configuration voltage multiplier module for a portable cold cathode X-ray source and its parameter optimization design method, belonging to the field of power electronics technology. The method targets a bidirectional voltage multiplier rectifier circuit, establishing its charge transfer model and performing mathematical optimization with the goal of minimizing the total voltage drop, deriving the optimal proportional relationship between each capacitor stage. Compared to traditional equal-capacitance designs, the graded capacitor configuration rule optimizes the performance of the voltage multiplier rectifier circuit by using a differentiated capacitor configuration module. This achieves a synergistic reduction in load voltage drop without increasing the number of voltage multiplier stages or capacitor capacity, thereby improving the stability and efficiency of the X-ray source. This technology is applicable to the high-efficiency power supply design of portable X-ray sources. The invention also provides corresponding simulation and experimental verification schemes.

A sterilization system, comprising a pressure regulator, solenoid valves, an active oxygen module group, a cold cathode UV mercury lamp, a control center, sensors and UV-LED lamps, connected to the pressure regulator from the external water source direction, the pressure regulator is divided into two waterways, two waterways are connected to the first / second solenoid valve respectively, the first solenoid valve controls the waterway through the active oxygen module group, and the second solenoid valve controls the waterway bypassing the active oxygen module group, two waterways are connected to the cold cathode UV mercury lamp, the waterway passes through the water flow sensor and the bacteria sensor in turn and leads to the drinking water outlet and the drain respectively, the UV-LED lamp is arranged at the drinking water outlet and / or the drain, the control method of the sterilization system comprises using the sterilization system as described above, completing different operation programs, the operation programs include a flushing program and a sterilization program, the system uses different judgment standards to judge the system, and the specific cleaning process and program of the system are determined.