38results about "Image-conversion/image-amplification tubes" patented technology

The present invention discloses a method for preparing an X-ray fluorescent screen and the X-ray fluorescent screen thereof. The preparation method comprises the following steps: S1, pretreatment: cleaning and drying a microchannel structure; the microchannel structure is provided with a plurality of through microchannels, and the microchannel structure is made of glass; S2, microchannel coating: coating the sidewalls of the microchannels with a reflective film; S3, preparing a suspension: mixing fluorescent material particles, a carrier solvent, and a surfactant, and dispersing them to prepare a suspension; S4, filling the microchannels; S5, repeating the filling; S6, post-treatment: cleaning the surface of the microchannel structure and encapsulating it; the X-ray fluorescent screen is prepared using the above preparation method; the X-ray fluorescent screen comprises a microchannel structure, the microchannel structure is provided with a plurality of through microchannels arranged in an array, and the microchannels are filled with fluorescent material particles. The present invention fills the glass microchannel structure with fluorescent material particles to improve the resolution and fluorescence transmission efficiency of the X-ray fluorescent screen.

The invention relates to colloidal quantum dots on a silicon photomultiplier microcell matrix. The techniques employ colloidal quantum dots (CQDs) in which a CQD layer is disposed on an array of SiPM microcells of an image sensor for an imaging module. The CQD layer and the microcell array are individually biased. A method includes biasing a CQD layer of an imaging module at a first voltage, and biasing an array of photomultiplier microcells at a second voltage. Upon receiving photons, the CQD layer generates charge in response. Charge moves from the CQD layer into the array, where at least one photomultiplier microcell amplifies the charge. A signal is then output from the imaging module in accordance with the amplified charge. This method can significantly improve the photon detection efficiency of the imaging element, which can be used in a wide range of applications such as lidar, medical imaging and night vision or in other weak light imaging scenarios.

This invention relates to the field of imaging system technology, providing a time-stretched scanning framing single-line-of-view imaging method and system, comprising: a photocathode for converting incident light signals into electron beams and transmitting ramp-stretching pulses; an anode grid, which, together with the photocathode, forms an accelerating electric field; a long magnetic lens for focusing the time-stretched electron beam; a deflection scanning system consisting of two sets of orthogonally arranged deflection plate electrodes, each set including two parallel and opposing plate electrodes, for applying a two-dimensional deflection electric field to the time-stretched electron beam, thereby spatially separating electron beams incident at different times; a gated microchannel plate detector for gating, multiplying, and imaging the deflected and separated electron beam; and a high-voltage pulse generator for generating cathode ramp-stretching pulses and microchannel plate gated selection pulses. This invention can better achieve high spatiotemporal resolution single-shot multi-frame single-line-of-view imaging.

There is disclosed a gated power supply for a night vision system includes an input terminal to receive source power, and output terminal to electrically couple to a photocathode, a first voltage source to source a positive or neutral voltage to the photocathode, a second voltage source to source a large negative voltage to the photocathode, and a switching circuit to switch between the first voltage source and the second voltage source on a duty cycle, wherein the switching circuit comprises an optical switch.

A photocathode. The photocathode includes an absorber. The absorber a p-type bulk active layer and a plurality of nanostructures formed on the p-type bulk active layer. The Photocathode further includes the plurality of nanostructures, such that the plurality of nanostructures are formed at a band bending region between the bulk active layer and the vacuum.

A night vision optical device includes an underlying device configured to be sensitive to light in a first spectrum, and to provide output light based on absorbing light in the first spectrum. The night vision optical device further includes a stacked device overlapping the underlying device. The stacked device includes one or more openings formed in the stacked device to form one or more transparent regions which are transparent to the light in the first spectrum to allow light in the first spectrum to pass through to the underlying device. The stacked device is sensitive to light in a second spectrum. The stacked device outputs light in the first spectrum to the underlying device as a result of absorbing light in the second spectrum. Thus, the underlying device outputs light based both on light passing through the transparent regions and on light output by the stacked device.

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 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.

The invention discloses a double-indium-sealed image tube which comprises a tube shell, a photoelectric cathode assembled with a first end of the tube shell and a fluorescent screen assembly assembled with a second end opposite to the tube shell. A first indium sealing layer for fixing the first end and the photoelectric cathode together is arranged between the first end of the tube shell and the photoelectric cathode, and a second indium sealing layer for fixing the second end and the fluorescent screen assembly together is arranged between the second end of the tube shell and the fluorescent screen assembly. According to the double-indium-sealed image tube, pollution to the tube shell and the surface of the fluorescent screen is effectively reduced. In addition, the invention also discloses a manufacturing method of the double-indium-sealed image tube.

The invention relates to the technical field of vacuum-solid mixed digital low-light-level devices, and particularly discloses a novel digital low-light-level imaging device and a manufacturing method of the novel digital low-light-level imaging device, and the novel digital low-light-level imaging device is characterized in that a photoelectric cathode is arranged below an input window; the micro-channel plate is arranged below the photoelectric cathode; the anode assembly is arranged below the microchannel plate, the anode assembly comprises a multilayer ceramic base, a chip heat dissipation assembly, a CMOS chip, a fluorescent screen and a getter, the chip heat dissipation assembly is arranged on the multilayer ceramic base, the CMOS chip is arranged on the chip heat dissipation assembly, the fluorescent screen is arranged on the CMOS chip, the CMOS chip is used for receiving optical signals output by the fluorescent screen, and the getter is arranged on the fluorescent screen. The signal is converted into a digital signal to be output; the input window, the photoelectric cathode, the front-end tube shell and the anode assembly are packaged together from top to bottom to form a vacuum cavity; and the high-voltage power supply provides working voltage for the digital low-light imaging device and realizes self-adaptive control of the output brightness of the device along with the working illumination according to a rear-end signal, and the high-voltage power supply comprises three paths of high-voltage outputs, namely cathode voltage, micro-channel plate voltage and anode voltage.

An image intensifier assembly has an image intensifier tube having a optical element. The optical element includes a emitting surface. The optical element comprises an outer dimension. The image intensifier assembly further includes a first power supply comprising a first circuit board having a first inner dimension defining an opening, a first outer dimension and a first thickness. The first inner dimension surrounds the outer dimension of the optical element. The first outer dimension is within the image intensifier assembly. The first circuit board further includes a component surface. The component surface extends from the first inner dimension to the first outer dimension. The first circuit board has power supply components mounted on the component surface.

A streak tube of an embodiment includes a container including an incident panel and an output panel, a photocathode, a sweep electrode, a plurality of electrodes provided between the photocathode and the sweep electrode and forming an electron lens that focuses the electrons, each of the plurality of electrodes being provided with an opening portion through which the electrons pass, and a controller configured to control a potential applied to at least one of the plurality of electrodes. The plurality of electrodes include a first electrode disposed at a position closest to the incident panel, a second electrode disposed at a position closest to the output panel, and a third electrode disposed between the first electrode and the second electrode to be spaced apart from the first electrode and the second electrode. The controller applies a potential higher than a potential of the first electrode and a potential of the second electrode to the third electrode.

The application belongs to the technical field of glass and specifically relates to a glass material with high corrosion resistance and stability, the cation composition of which is as follows in terms of mole percentage: 61-70% of Si 4+ , 3-12.5% of B 3+ , 1-5.5% of Al 3+ , 5-13% of K + , 5-13% of Na + , 0.2-3% of Ca 2+ , 0.1-2% of Li + , 0.1-1% of Mg 2+ , and 0.1-1% of Ti 4+ . The application is designed in a multi-component and multi-functional synergistic manner, so that the prepared glass meets the harsh requirements on thermal, optical, chemical and processing properties, is suitable for high-end optical devices such as micro-channel plates, and has a wide application prospect in the fields of photoelectric detection and imaging, mass spectrometers, high-energy physics, streak cameras, high-end medical imaging and the like.

The invention relates to a microchannel wafer (18) comprising a body (39) provided with a plurality of tubular microchannels (25) whose axes of revolution are parallel to each other; and a functionalization layer (33) present on an internal surface of each microchannel (25). According to the invention, the constituent material of the body (39) is pure silica. Figure for the abstract: Fig 5

The invention relates to the technical field of imaging systems, and provides a time broadening scanning framing single-sight-line imaging method and system, and the system comprises a photoelectric cathode which is used for converting an incident light signal into an electron beam and transmitting a slope broadening pulse; the anode grid mesh and the photoelectric cathode jointly form an accelerating electric field; the long magnetic lens is used for focusing the electron beam after time broadening; the deflection scanning system is composed of two groups of deflection plate electrodes which are orthogonally arranged, each group of deflection plate comprises two parallel and opposite plate electrodes, and the deflection plate electrodes are used for applying a two-dimensional deflection electric field to the electron beams subjected to time broadening, so that the electron beams incident at different time are separated in space; the gating micro-channel plate detector is used for performing gating, multiplication and imaging on the electron beams after deflection separation; and the high-voltage pulse generator is used for generating a cathode slope broadening pulse and a micro-channel plate gating pulse. According to the invention, single-time multi-frame single-sight imaging with high spatial-temporal resolution can be well realized.

This invention relates to a photodetector comprising a support layer (10), a grating structure (20), and an active layer (30). The grating structure (20), referred to as a photonic crystal structure, comprises a pattern (22.1) and a non-zero constant thickness e. ccs The structured layer (22) is formed by the continuous sublayer (22.2), and the pattern (22.1) widens along the direction toward the continuous sublayer (22.2). Furthermore, the size of the photonic crystal structure (20) is such that the structured layer (22) forms a photonic crystal that supports at least one guided mode that can be excited by the incident light of interest. The photonic crystal is optically coupled to the active layer (30), such that the guided mode is optically confined in the structured layer (22) and the active layer (30).

To provide an improved micro channel plate.SOLUTION: A method for selectively vapor-depositing electrode contact metal on one side of a MCP channel opening is prepared. One or more MCPs are removably fixed on the surface of a platter rotating around the central platter axis, inclined on a rotary ring fixture surrounding the vapor deposition source of contact metal and further rotating so as to go around the vapor deposition source of the contact metal. A mask having a mask opening having a variable size is arranged between the rotating platter and the vapor deposition source, and the mask goes around the vapor deposition source with the rotating platter without rotating along the own axis like the rotating platter.SELECTED DRAWING: Figure 10

The invention discloses a low-light-level image intensifier filling and sealing structure and a filling and sealing method, and belongs to the technical field of image intensifiers. According to the encapsulation method, a pressure glue injection vacuum encapsulation technical scheme is generally adopted, and a base, an upper sealing ring, a sealing ring, a lower sealing ring and an image intensifier encapsulation shell in the encapsulation structure form a sealed cavity. In vacuum encapsulation equipment, the encapsulation glue is injected from a bottom glue injection head and enters the image intensifier from the bottom of an image intensifier encapsulation shell and a waist glue inlet hole respectively, air in the image intensifier is exhausted from bottom to top, the encapsulation glue finally overflows from a glue outlet hole of an image intensifier encapsulation cover, and complete filling of glue in the image intensifier is achieved. Compared with a traditional immersion vacuum potting method, on the premise that the same potting quality is guaranteed, the using amount of the potting adhesive is greatly reduced, the production cost is reduced, meanwhile, the designed potting structure is easy to assemble and disassemble, and the large-scale production efficiency is effectively improved.

A photocathode epitaxial structure. The photocathode epitaxial structure includes an improved substrate stack. The improved substrate stack includes a GaAs substrate and one or more additional layers formed on the GaAs substrate. The one or more additional layers are configured to provide an improved substrate stack surface with predetermined characteristics for forming a semiconductor device on the improved substrate stack surface. The photocathode epitaxial structure further includes an InGaAs p-type photocathode formed on the improved substrate stack surface. The InGaAs p-type photocathode has a predetermined percentage of In.

The invention relates to a photodetector comprising a support layer (10), a grating structure (20) and an active layer (30). The grating structure (20), called a photonic crystal structure, comprises a structured layer (22) formed of patterns (22.1) and a continuous sub-layer (22.2) of constant thickness eccs not being zero, the patterns (22.1) widening in a direction oriented towards the continuous sub-layer (22.2). In addition, the photonic crystal structure (20) has dimensions such that the structured layer (22) forms a photonic crystal which supports at least one guided mode capable of being excited by the incident light radiation of interest, the photonic crystal being optically coupled to the active layer (30) so that the guided mode is optically confined in the structured layer (22) and the active layer (30). Figure for abstract: Figure 2A

The present invention provides a microchannel plate for ultraviolet light and X-ray detection with high stability and high detection efficiency, and a preparation method thereof. On the basis of the microchannel plate, a film material with high photoelectric conversion efficiency is plated on the input surface of the microchannel plate and at a certain depth of the channel as a reflective photocathode; after plating the photocathode material, an ultra-thin, uniformly thick, dense protective layer is prepared using atomic layer deposition technology. The protective layer material includes silicon oxide, hafnium oxide, aluminum oxide, titanium oxide, silicon nitride, etc., which has a strong ability to block water vapor and a certain secondary electron emission capability, thereby reducing the impact on the performance of the MCP itself. The MCP prepared according to the above method can be widely used in open structure detectors and related equipment, and can withstand multiple vacuum and atmospheric environment conversions without significant changes, greatly expanding the application range of materials such as halides that are easily affected by humid air as reflective photocathodes on the input surface of the MCP.

The invention discloses a hole bar time compensation type image intensifier and a design and assembly method of a compensation structure, and solves the problems that the consistency of gating time intervals becomes poor and even the gating time intervals are completely separated due to the fact that gating starting or turn-off time of an existing image intensifier in different imaging areas is inconsistent. According to the aperture bar time compensation type image intensifier, the aperture bar time of the image intensifier can be compensated based on the delay difference of the bent optical fiber panel to optical signals in different areas, simultaneous detection of different areas of a physical target image is facilitated, and the application effect of the image intensifier in sub-ns gating is improved.

Extracting data in pulsed light, the method includes receiving input light at an image intensifier tube. At a power supply coupled to the image intensifier tube, current to the image intensifier tube is varied to implement automatic brightness control of the intensifier tube based on intensity of the input light received at the image intensifier tube. At a signal processor coupled to the power supply, changes in voltage or current supplied by the power supply occurring as a result of changes in the intensity of the input light to the image intensifier tube are detected. Based on the changes in voltage or current supplied by the power supply, data embedded in the input light to the image intensifier tube is extracted.

To provide a method for controlling performance of a night-vision device.SOLUTION: A control method contains: a step of supplying a control voltage for controlling a gain of a micro channel plate to the micro channel plate of an image intensifier tube by a power supply; a step of determining a compensation amount for being adapted to the control voltage on the basis of a change of the control voltage caused by a change of a temperature of an operation environment of the night-vision device; a step of adjusting the control voltage in accordance with the compensation amount to acquire a compensation control voltage; and a step of supplying the compensation control voltage to the micro channel plate of an optical intensifier tube by the power supply. The method further contains a step of determining whether the night-vision device is used for a predetermined time, and is constructed so as to supply the compensation control voltage only after the predetermined time.SELECTED DRAWING: Figure 1

The invention relates to a high-temporal-spatial-resolution diagnosis system which comprises an electronic pulse energy dispersion regulation and control system, an electronic pulse space dispersion regulation and control system, a gated imaging system, an ultrafast electric pulse generator and a high-voltage narrow pulse generator. The electronic pulse energy dispersion regulation and control system comprises a micro-strip cathode structure based on electric pulse reflection superposition enhancement, an anode and an electronic flight tube; the gated imaging system comprises a micro-channel plate, a fluorescent screen, a light cone and a camera; and after each path of ultrafast electric pulse in the plurality of paths of ultrafast electric pulses is respectively input to the microstrip cathode corresponding to the microstrip cathode structure, superposition of double paths of electric pulse signals is formed through the reflection effect of the microstrip cathode structure, and the microstrip cathode structure is excited. The micro-strip cathode structure is utilized to reflect ultrafast electric pulses, so that voltage compensation is realized, the problem of non-uniform spatial voltage distribution of the micro-strip cathode is solved, the imaging size is improved, large-imaging-size detection is realized, the slope of ultrafast electric pulse signals is enhanced, and the time resolution is further improved.

The present invention provides a microchannel plate, a preparation method and application thereof, where the microchannel plate is provided with a large number of channels penetrating in the thickness direction. On one side of an inlet end face of the microchannel plate, a flared end face of each channel is a hexagonal tapered bore; and in a cross-section perpendicular to an axial direction of each channel, the flared end face of the channel has an outer edge that is hexagonal and an inner edge that is circular. The present invention proposes a hexagonal special-shaped flared microchannel plate with an array of micropores having hexagonal tapered bores in the end face and cylindrical inside, where the circles in the form of a hexagonal packed periodic array is replaced with the hexagons in the form of a hexagonal close-packed periodic array, so that the close-packed coefficient of the channel array of the microchannel plate increases from 0.907 when the existing circular channels are arranged in a hexagonal manner to 1 when the hexagonal channels are arranged in a hexagonal manner, so that when the flared end face channel wall thickness of the channel of the microchannel plate is ≥100 nm, an open area ratio of the microchannel plate is ≥91%. The present invention significantly improves the open area ratio of the input surface of the microchannel plate, improves the detection efficiency of the microchannel plate for an input signal, while avoiding generation of a flared tip to cause a tip discharge, and thus is more suitable for practical use.

The invention relates to an ultrafast imaging assembly, in particular to a multi-electrode gating type image intensifier and a gating method thereof, and aims to solve the problem that an existing double-proximity image intensifier is difficult to meet high spatial resolution and sub-ns-level time resolution gating at the same time. The device comprises a transparent conductive film, an incidence window, a photocathode, a micro-channel plate, a fluorescent screen, an output window, an encapsulation shell, a kovar metal ceramic vacuum sealing tube, a power supply and a driving part. The capacitive voltage division method is adopted, the transparent conductive film electrode is added in front of the incidence window, sub-ns-level time resolution gating is achieved on the premise that the spatial resolution index of the general double proximity image intensifier is kept, and high-time-resolution and high-spatial-resolution image diagnosis can be achieved at the same time.

An image intensifier assembly has an image intensifier tube having a optical element. The optical element includes a emitting surface. The optical element comprises an outer dimension. The image intensifier assembly further includes a first power supply comprising a first circuit board having a first inner dimension defining an opening, a first outer dimension and a first thickness. The first inner dimension surrounds the outer dimension of the optical element. The first outer dimension is within the image intensifier assembly. The first circuit board further includes a component surface. The component surface extends from the first inner dimension to the first outer dimension. The first circuit board has power supply components mounted on the component surface.

The invention discloses a superlattice blue-green light enhanced photoelectric cathode which comprises a gallium arsenide cap layer, a superlattice absorption layer and a window layer which are arranged in a stacked mode, the thickness of the gallium arsenide cap layer is larger than or equal to 3 nanometers and smaller than or equal to 10 nanometers, and the outer surface of the gallium arsenide cap layer is a negative electron affinity surface; the superlattice absorption layer comprises a plurality of gallium-arsenic-phosphorus barrier layers and a plurality of indium-gallium-arsenic well layers, and the gallium-arsenic-phosphorus barrier layers and the indium-gallium-arsenic well layers are alternately stacked to form a plurality of periodic structures. The thickness of each periodic structure is greater than or equal to 5 nanometers and less than or equal to 15 nanometers to shift the peak value of the light absorption wavelength of the photocathode to a wavelength range greater than or equal to 500 nanometers and less than or equal to 600 nanometers. The superlattice absorption layer is arranged, so that electrons and holes are limited by quantum in the indium gallium arsenic well layer, energy level splitting is triggered, and absorption spectrum blue shift is further achieved.