148results about "Mutiple dynode arrangements" patented technology

The invention discloses a micro-channel plate manufacturing method, which comprises the following steps of: bombarding a processing sample through heavy ions to form a plurality of micro-channels on the processing sample; cleaning the path of the micro-channel, and expanding the aperture of the micro-channel; performing high-impedance treatment on the inner wall of the micro-channel to form a high-impedance inner wall; on the basis of the steps, the high-energy heavy ions generated by the high-energy accelerator are used for bombarding the glass sample with set parameters to manufacture the micro-channel plate, so that the tedious manufacturing processes of manufacturing a capillary glass tube and machining and shaping are omitted; the production efficiency is improved, the manufacturing time is shortened, and the production cost is reduced. The technical problem that much inconvenience is brought to production, processing and use due to the fact that micro-channel plates in the market are prone to deformation and even damage in the production process is solved.

The invention relates to a preparation method of a micro-channel plate, and the method comprises the following steps: 1) processing a transparent material to obtain a micro-channel plate substrate blank; 2) carrying out ultrasonic cleaning on the micro-channel plate substrate blank; 3) performing femtosecond laser induction on the cleaned micro-channel plate substrate blank to modify a glass substrate to form a modified area array; 4) performing ultrasonic chemical etching on the micro-channel plate substrate blank, and corroding the modified area array to form a through hole array; and 5) forming a micro-channel plate glass substrate, and carrying out ultrasonic cleaning on the micro-channel plate glass substrate. The invention has the following beneficial effects: (1) the problem of high manpower and cycle cost caused by various processes such as glass tube drawing, monofilament drawing, multifilament drawing, leveling and the like in the traditional process is solved; and (2) due to the adoption of accurate control and micro-nano manufacturing technologies, the technical problem of high-performance and low-cost preparation of the micro-channel plate is solved, and the yield is improved.

The invention relates to centrifugal bending equipment, a bending type channel micro-channel plate and a preparation method and application of the bending type channel micro-channel plate. The centrifugal bending equipment comprises a high-temperature furnace which is of a cylindrical cavity structure comprising a cavity and a furnace wall and is arranged in the axis vertical direction; a heating body is arranged in the furnace wall; the centrifugal acceleration system comprises a rotating tray; a centrifugal bending fixture is arranged on the rotary tray; the rotary tray and the centrifugal bending fixture can rotate in a horizontal plane around the axis of the high-temperature furnace; the control system is connected with the high-temperature furnace and the centrifugal acceleration system; and the control system sets and controls the temperature in the high-temperature furnace and the rotating speed of the centrifugal bending fixture according to the technological parameters. The technical problem to be solved is how to provide the bending type channel micro-channel plate so as to reduce and eliminate positive ion feedback noise and electron transmission noise of the micro-channel plate. Meanwhile, the preparation process effectively solves the problems of channel aperture deformation and inconsistent bending curvature, and avoids causing non-uniform MCP gain and reduction of imaging resolution.

The present invention provides a micro-channel plate, a preparation method therefor and the use thereof. The micro-channel plate is provided with a plurality of through channels, wherein on the side of an inlet end face of the micro-channel plate, a flared end face of each channel is a hexagonal tapered hole; and in a cross section perpendicular to the axial direction of each channel, the outer edge of the flared end face of the channel is hexagonal, and the inner edge thereof is circular. The present invention provides a micro-channel plate having hexagonal special-shaped flared holes, which micro-channel plate has a micro-hole array presented as hexagonal tapered holes on an end face and cylinders inside; a circular packed array is replaced by a hexagonal close-packed structure, so that the close packing coefficient of a channel array of the micro-channel plate is increased from 0.907 in existing hexagonal arrangements of circular channels to 1 in the hexagonal arrangement of hexagonal channels, and when the channel wall thickness of the channel of the micro-channel plate at the flared end face is greater than or equal to 100 nm, the opening ratio of the micro-channel plate is greater than or equal to 91%. The opening ratio of an input surface of the micro-channel plate is significantly increased, the detection efficiency of the micro-channel plate regarding input signals is improved, and flared tips and tip discharge caused thereby are avoided, such that the micro-channel plate is more suitable for practical application.

In an electron tube, the meta-surface emits an electron in response to an incidence of the electromagnetic wave. The first and second electrodes are spaced away from each other, and apply potentials different from each other to the meta-surface. A holder is disposed in the housing and holds the electron emitter. A first conductive line of the meta-surface is electrically connected to the first electrode. A second conductive line of the meta-surface is spaced away from the first conductive line, and is electrically connected to the second electrode. The first conductive line extends from the first electrode to the second conductive line. The second conductive line extends from the second electrode to the first conductive line.

The invention discloses an axial asymmetric micro-channel plate structure based on an amorphous silicon material and a preparation method of the axial asymmetric micro-channel plate structure. The axial asymmetric micro-channel plate structure comprises a plurality of micro-channels arranged in a penetrating mode in the thickness direction of a device; each micro-channel is provided with an inlet section and an outlet section along the axial direction of the micro-channel plate; the channel geometric parameters of the micro-channels are different on the inlet section and the outlet section; or the equivalent electric fields of the micro-channels are distributed on the inlet section and the outlet section in a different manner; the inlet section of each micro-channel is used for regulating and controlling the initial incidence condition of electrons and the first effective interaction between the inlet section and the inner wall of the channel; collaborative design is carried out on geometrical morphology, electrical characteristics and material characteristics of the microchannels in the axial direction according to different physical stages of the electronic multiplication process corresponding to the structural level of the microchannels. According to the structure, higher controllability and consistency are obtained in the multiplication and transmission process of electrons in the channel on the structural level, and the structural rationality and design flexibility of the micro-channel plate serving as an electron multiplier are improved.

The present invention belongs to the technical field of electron multipliers, and relates to a rotary multi-stage separated dynode multiplication structure, which includes a turntable, a plurality of rotary dynodes, and a fixed dynode arranged outside the turntable; the fixed dynode includes a first cathode plate, a grid, a first upper baffle connected to the upper end of the first cathode plate, and a first lower baffle connected to the lower end of the first cathode plate. The first cathode plate is an arc-shaped plate, and the grid is connected to the side of the first cathode plate; the rotary dynode includes a second cathode plate, a second upper baffle, and a second lower baffle. The second cathode plate has the same shape as the first cathode plate, and both the second upper baffle and the second lower baffle are leaf-shaped plates; the plurality of rotary dynodes includes N working dynodes and a spare dynode, and the turntable is connected with a rotating device. The spare dynode can replace the dynode with deteriorated performance, thereby prolonging the service life of the electron multiplier. By rotation, the problem of too rapid deterioration of the performance of the first-stage and last-stage dynodes can be solved, and the gain of the electron multiplier can be improved.

To provide a photoelectron multiplier capable of improving time characteristics due to an anode.SOLUTION: A photoelectron multiplier 1 includes: a photocathode 3; ten dynodes 10 that multiply electrons emitted from the photocathode 3; and an anode 7 that collects electrons multiplied by the dynode 10. The anode 7 has an electron collection surface 73 that faces a secondary electron emission surface 11j of a tenth dynode 10j and extends along the secondary electron emission surface 11j. The anode 7 has no electron passage hole on the electron path from the ninth dynode 10i to the tenth dynode 10j.SELECTED DRAWING: Figure 2

This MCP detector (1) is provided with: an MCP (3) having an input surface (3a) into which electrons (e1) are input; multiplication units (11A, 11B) that multiply electrons generated in accordance with the input of the electrons (e1); an output surface (3b) that outputs the electrons (e2) multiplied by the multiplication units (11A, 11B); a planar dynode (5) which is separated from the output surface (3b), is arranged substantially parallel to the output surface (3b), and multiplies the electrons (e2) output from the output surface (3b); and an electron collection unit (7) that is disposed between the output surface (3b) and the dynode (5), is separated from the output surface (3b) and the dynode (5), and collects the electrons (e3) multiplied by the dynode (5), the electron collection unit (7) having: a line anode (7a) that includes a metal line extending along a plane substantially parallel to the output surface (3b); and a wire anode (7b) that is electrically insulated from the wire anode (7a), includes a metal wire extending along the plane, and is disposed between the wire anode (7a) and the dynode (5).

The invention belongs to the technical field of vacuum electronic devices, and particularly relates to a dynode with an edge expansion type inner substrate and an electron multiplier comprising the dynode. The dynode comprises a grid mesh assembly, a base frame box and an edge expansion type inner substrate, and the inner substrate is located in the base frame box. The lining bottom comprises an arc-shaped side wall part, an upper wall, a lower wall and a bent part; the bent parts are arranged between the arc-shaped side wall part and the upper wall and between the arc-shaped side wall and the lower wall; the base frame box comprises a side wall, and an upper baffle and a lower baffle which are connected with the side wall; the arc-shaped side wall part of the lining bottom is attached to the side wall of the base frame box, the upper wall of the lining bottom is tightly attached to the upper baffle of the base frame box, and the lower wall of the lining bottom is tightly attached to the lower baffle of the base frame box. The inner substrate structure enables the electric field in the dynode to change, and especially the electric field intensity at the corners in the dynode, namely the area where the bent part is located, is obviously changed. The problem of low dynode electron collection efficiency is solved, and the gain of the electron multiplier is improved.

This photomultiplier tube includes a photoelectric surface, N-stage dynodes (N is an integer of 2 or more) for multiplying electrons emitted from the photoelectric surface, and an anode for collecting electrons multiplied by the dynodes. The anode has an electron collection surface that faces a secondary electron emission surface of the N-th stage dynode and at least partially extends along the secondary electron emission surface, and there is no electron passage hole on an electron path from the N-1th dynode to the N-th dynode.

The invention discloses a silicon-based micro-channel plate (MCP) structure and a manufacturing method thereof, relates to the technical field of semiconductor device manufacturing, and aims to solve the problems of poor high temperature resistance, insufficient etching precision, film layer quality defect and process synergy deficiency of a traditional glass-based / organic-based MCP. An 8-inch N-type monocrystalline silicon wafer is adopted in the structure, the thickness of the N-type monocrystalline silicon wafer is (250-350) + / -25 microns, micropores of 3-10 microns are evenly distributed, the hole pitch is 7-22 microns, the inclination angle is 6-12 degrees, the side wall roughness is smaller than or equal to 50 nm, the perpendicularity deviation is smaller than or equal to + / -0.5 degrees, an AlO or AlO / HfO / AlO electron multiplication layer with the thickness of 10-30 nm is prepared on the inner wall of a channel through ALD, and a Cr / Ni electrode with the thickness of 50-80 nm is plated on the surface. According to the method, the OES is used for monitoring SiFs in real time. According to the invention, the double targets of < = 30% of 1kg impact fracture rate and stable electron multiplication gain are achieved, the tolerable temperature reaches 800 DEG C, the secondary electron emission efficiency is improved by 25%, the production efficiency is improved by 20%, the cost is reduced by 15%, and the method is suitable for the high-sensitivity detection fields of night vision imaging, particle detection and the like.

A night vision system is provided, along with a method for interrupting the continuous drawing of electrons from an image intensifier tube and an electron multiplier. The night vision system includes an electron multiplier, or possibly two electron multipliers, each including a silicon membrane. A shutter voltage is applied between a first surface and a second surface of the substantially parallel, opposing silicon membrane to interrupt the drawing of electrons through the electron multiplier and substantially interrupt the display of an image from the image intensifier tube under certain bright light conditions. Utilizing global shutter control for the electron multiplier and significantly reducing the voltage for such control reduces power consumption within the image intensifier, as well as electromagnetic interference and lag response time. A relatively low negative bias shutter voltage on only the electron multiplier selectively provides a global shutter for the image intensifier device.

The invention relates to a micro-channel plate, in particular to an electron beam focusing method of the micro-channel plate, the micro-channel plate and an image intensifier, and solves the technical problem that the spatial resolution of the image intensifier is reduced due to the fact that the existing micro-channel plate is easy to generate an electron beam spot expansion effect. According to the electron beam focusing method of the micro-channel plate provided by the invention, the insulating dielectric layer and the modulation electrode are arranged outside the output electrode of the existing micro-channel plate, and different working voltages are applied to the output electrode and the modulation electrode, so that an electric field with electron beam focusing capability is formed between the two electrodes; the electron beams emitted by each micro-channel are focused and shaped, so that the size of an electron beam spot is reduced, and the spatial resolution is improved. Meanwhile, the modulation electrode changes the electric field distribution condition at the output electrode, so that more multiplied electrons can be emitted, and the electron gain of the micro-channel plate can be improved.

An electron tube includes a vacuum container having a translucent substrate; a photoelectric element disposed on the inner surface of the translucent substrate; an anode disposed within the vacuum container; and a prism. The prism has a bottom surface bonded to the outer surface of the translucent substrate; a light incident surface; and a light reflecting surface that further reflects light that enters the photoelectric element via the prism and the translucent substrate and is reflected at the interface between the photoelectric element and the vacuum space, causing the light to enter the photoelectric element again. The light reflecting surface has an outwardly convex curved surface. The light incident surface is located inward of an imaginary spherical surface extending along the light reflecting surface.

This electron tube is provided with an electron emission unit including a metasurface from which electrons are emitted in response to entering of an electromagnetic wave having a predetermined electric field vibration direction, an electron multiplication unit that multiplies the electrons emitted from the electron emission unit, and a mesh electrode disposed between the electron emission unit and the electron multiplication unit. The mesh electrode includes a plurality of thin wires defining a plurality of openings arranged in a first direction parallel to the electric field vibration direction. When viewed in a traveling direction of the electromagnetic wave, each of the plurality of openings has an elongated shape of which the longitudinal direction corresponds to a second direction intersecting the first direction at an angle greater than or equal to 45 degrees.

Components of scientific analytical equipment. More particularly, ion detectors of the type which incorporate electron multipliers and modifications thereto for extending the operational lifetime or otherwise improving performance. The ion detector may be embodied in the form of a particle detector having one or more electron emissive surfaces and / or an electron collector surface therein, the particle detector being configured such that in operation the environment about the electron emissive surface(s) and / or the electron collector surface is / are different to the environment immediately external to the detector.

The invention relates to a micro-channel plate manufacturing method based on a mold pouring method and a micro-channel plate. The method comprises the steps that a silicon microchannel array substrate is placed on a metal mold material, and holes of the silicon microchannel array substrate face downwards; based on a crucible and a vacuum hot melting filling device, liquefying a metal mold material and filling the metal mold material into the silicon micro-channel array substrate; cooling to realize metal curing to obtain a metal mold precursor, and corroding silicon to obtain a metal mold; putting the high borosilicate glass material and the metal mold into a crucible, and filling the high borosilicate glass material into the metal mold based on a vacuum hot melting filling device; cooling to obtain a glass-metal complex, and corroding a metal material to obtain a micro-channel plate substrate; carrying out hydroxylation treatment; and preparing a dynode on the micro-channel plate substrate, and performing annealing treatment to obtain the micro-channel plate. The microchannel plate with a high softening point and high purity can be manufactured, the yield is high, noise is low, exhaust in the channel is sufficient, and the service life of the image tube is prolonged.

The invention relates to core material glass for a micro-channel plate as well as a preparation method and application of the core material glass. The core material glass for the micro-channel plate comprises the following components in percentage by mass of oxides: 18-24% of SiO2; 0 to 16% of B2O3; the sum of the contents of La2O3 and HfO2 is 23 to 35 percent; 10% to 16% of BaO; 1 to 4% of Al2O3; 3 to 7% of Y2O3; and 5 to 10% of Ho2O3. The technical problem to be solved is to provide the core material glass for the microchannel plate, the transition temperature Tg of the core material glass is greater than or equal to 700 DEG C, the softening temperature Tf of the core material glass is greater than or equal to 760 DEG C, and the core material glass is suitable for the third-generation microchannel plate.

A photomultiplier includes a housing including a proximal end and a distal end, an optical window disposed at the proximal end of the housing, an end-wall plate disposed at the distal end of the housing, a feedthrough that penetrates through the end-wall plate, and a gas electron multiplier (GEM) board disposed between the optical window and the end-wall plate.

The present invention relates to an MCP-PMT readout circuit, which includes an MCP-PMT socket chip U1, a high-voltage socket chip U2, a signal socket pin unit U3, and the connection relationships between their respective pins; the output signal of the output electrode of the MCP-PMT is read through the pins of the MCP-PMT socket chip U1; the high-voltage socket chip U2 supplies power to each electrode of the MCP-PMT; the signal socket pin unit U3 receives the output signal of the output electrode of the MCP-PMT and transmits it to the front-end circuit. The readout circuit of the present invention can, to the greatest extent, avoid the phenomena of crosstalk and ringing when reading the MCP-PMT signal, improve the performance of the MCP-PMT, and make the performance of the MCP-PMT more stable.

The invention discloses a small-halo vacuum photoelectric device and application thereof. The small-halo vacuum photoelectric device comprises a first ceramic ring, a second ceramic ring, a first metal ring, a second metal ring, an elastic pressing ring and an electron multiplication plate with a conductive input surface and a conductive output surface, a first ceramic ring is arranged on the bottom surface of the first metal ring; a second metal ring is arranged on the bottom surface of the first ceramic ring; the second metal ring is arranged on the top surface of the second ceramic ring; an anode is arranged on the bottom surface of the second ceramic ring. By arranging an angle from 89 degrees to 86 degrees on the elastic compression ring of the structure device, plane contact between the elastic compression ring and the conductive input surface of the electron multiplication plate is realized, and local or complete non-electric contact between the elastic compression ring and the electron multiplication plate and related surfaces thereof is eliminated; the halo phenomenon generated by stray light generated by surface deformation of the electron multiplier plate is eliminated, and the imaging quality is improved.

The application discloses a kind of compact structure, high time resolution microchannel plate assembly, it can be applied to analytical instrument such as mass spectrometry detection field.The microchannel plate assembly includes: output electrode column, fixed screw, insulating substrate, anode cover plate, anode plate, output electrode plate, microchannel plate, metal shielding base, positioning sleeve, wherein, output electrode plate and output electrode column are connected to each other and constitute the output electrode of microchannel plate;Anode plate is connected to each other by plane anode pattern and conical receiving terminal and constitutes;Microchannel plate input surface is plated with high secondary electron emission film, to realize the high detection efficiency of microchannel plate assembly.Insulating substrate, anode cover plate, anode plate, output electrode plate, microchannel plate and metal shielding base are fixed by fixed screw and become integrated form, with compact structure, high time resolution characteristics.

A method for controlling an ion detector is provided. The method includes converting a received ion into emitted electrons, multiplying the emitted electrons, detecting the multiplied electrons, generating a detection signal in response, and determining the ion intensity from the detection signal.

This application relates to the technical field of low-light imaging and photoelectric detection, and discloses an image intensifier with a microchannel plate having dual-layer output electrodes. The intensifier includes a photocathode, a microchannel plate, and a fluorescent screen arranged sequentially along the directions of photon, photoelectron, and secondary electron propagation. The output end of the microchannel plate has a dual-layer output electrode structure, including a first output electrode layer, a high secondary electron multiplication layer, and a second output electrode layer stacked sequentially from the inside to the outside of the channel. This structure collimates and focuses the output electrons, thereby improving spatial resolution. The high secondary electron multiplication layer of the microchannel plate is an insulating material with a high secondary electron emission coefficient, which can compensate for the gain loss caused by the immersion of the first and second output electrode layers into the channel, improving the spatial resolution of the image intensifier while effectively maintaining its gain performance.

The invention relates to the technical field of electron emission, and discloses a large-current pulse micro-channel plate electron emission source and an X-ray generation device. According to the electron emission source, an electron emission function layer at the head end of an MCP assembly is excited by adopting a rapidly regulated and controlled UV LED light source, and ultrafast time sequence modulation of electron beams is realized through an avalanche multiplication process of the electron beams in the MCP. By adopting a specific high-lead, low-alkali or alkali-free glass component or ceramic substrate composite functional film layer structure, the MCP assembly has long service life stability of low resistance, high current output and high power density operation. Independent bias voltage and gating voltage synchronous with electronic pulse are applied to the MCP assembly through the driving control unit, accurate thermal management is carried out in combination with a pulse-charging circulation mode, and the problems of charge compensation and thermal limitation under large current output are effectively solved. The electron emission source breaks through the bottleneck, supports peak current density exceeding 100 mA / cm under submicrosecond pulse, and realizes hundred microampere level steady-state current output under millisecond level long pulse.

This invention discloses a microchannel plate glass and its preparation method, relating to the field of special glass materials technology. The microchannel plate glass includes a skin glass and a core glass. The skin glass includes P2O5, V2O5, BaO, La2O3, Li2O+Na2O+K2O, ZrO, Al2O3 and Al(OH)3, PbO, and Fe2O3. The core glass includes P2O5, ZnO, Al2O3 and Al(OH)3, SiO2, CaO+MgO, and BaO. This invention overcomes the shortcomings of traditional lead-containing silicate glass as a substrate material for MCP microporous arrays. Furthermore, the microchannel plate made of semiconductor glass does not require hydrogenation heat treatment and does not exhibit this "cation feedback" phenomenon. Compared to microchannel plates made of ordinary glass, the bulk conductivity microchannel plate can maintain stable performance over a long period. By screening specific material components and optimizing the ratio of each component, the skin glass and core glass can simultaneously possess a stable network framework and a high softening temperature, while achieving a precise match between their coefficients of thermal expansion and high-temperature viscosity coefficients.

The invention relates to microchannel plate hydrogen directional reduction equipment and a microchannel plate hydrogen directional reduction method. The equipment comprises a micro-channel plate hydrogen reduction device which comprises a chamber for placing a micro-channel plate and reducing hydrogen; a first pipe; one end of the second pipeline is connected with the first pipeline, and the other end of the second pipeline is connected with the microchannel plate hydrogen reduction device; the second pipeline is further provided with a flow and pressure measuring system and a valve. The valve is arranged at the downstream of the flow and pressure measuring system; the exhaust hole is formed in the micro-channel plate hydrogen reduction device; and when the valve is closed, gas in the micro-channel plate is communicated with external gas only through the exhaust hole. The technical problem to be solved is how to provide the device and the method, so that the bulk resistance of the micro-channel plate is stable, and the deformation of the micro-channel plate is reduced or even avoided.

To provide a photoelectron multiplier capable of preventing discharge between dynodes while improving time characteristics.SOLUTION: A photoelectron multiplier 1 includes: a photocathode 3; an N-th dynode 10 (N is an integer of 2 or more) that multiplies electrons emitted from the photocathode 3; and an anode 7 that collects an electron multiplied by the dynode 10. An m-th dynode 10 (m is an integer of 2 or more and N or less) is disposed so as to face an (m-1)-th dynode 10. In a longitudinal direction of the dynode 10, the width of an edge E of the m-th dynode 10 on the (m-1)-th dynode 10 side is smaller than the width of the (m-1)-th dynode 10. In the longitudinal direction of the dynode 10, the edge E of the m-th dynode 10 is included inside the (m-1)-th dynode 10.SELECTED DRAWING: Figure 6

The application relates to the technical field of micro-light imaging, and discloses an image intensifier with a micro-channel plate, which comprises, from top to bottom, a photocathode, a micro-channel plate and a fluorescent screen. The micro-channel plate comprises a lead silicate glass substrate with hundreds of thousands of electron multiplication channels, an input electrode located at the incident end of the channels, an output electrode located at the outgoing end of the channels and a channel inner wall forming the inner surface of the channels. The surface layer of the input electrode and the channel inner wall is a material layer, and the surface layer of the output electrode is a NiCr material layer. The input electrode and the channel inner wall adopt a material layer with a high secondary electron emission coefficient to ensure high gain; the output electrode adopts a NiCr material layer with a low secondary electron emission coefficient to absorb large-angle electrons and collimate the output electron beam, thereby improving the spatial resolution, effectively solving the mutual restriction relationship between the spatial resolution and the gain in the existing micro-channel plate and realizing high-brightness and high-definition imaging.