95results 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.

Image intensifier systems incorporating a microchannel plate (MCP) and methods for producing the same are disclosed. A device is disclosed that includes a first substrate having a radiation-receiving first surface and an opposed second surface through which electromagnetic radiation is transmitted. A second substrate is coupled to the first substrate to define a vacuum cavity therebetween having electron-emitting photocathode is disposed therein. A microchannel plate (MCP) is disposed within the vacuum cavity and defines microchannels extending from an input end to an output end. Each of the microchannels is configured to generate / amplify electrons in response to the electrons received photocathode. The imaging array can include a plurality of metal plates connected to capacitors and configured to collect electrons from the MCP to produce a digital image responsive to electromagnetic radiation received at the first substrate and converted to electrons by the photocathode and multiplied by the MCP.

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.

A control circuit and method 200 may be provided for regulating a luminous gain of an image intensifier. The control circuit and method may perform automatic brightness control by regulating (240) a luminous gain of the image intensifier to maintain an output brightness at or below a desired maximum output brightness level. When a sudden increase in the scene brightness causes the output brightness to exceed the desired maximum output brightness level, the control circuit and method may deactivate (250) the photocathode and interrupt the automatic brightness control, reduce (260) the luminous gain of the image intensifier in accordance with a first gain reduction parameter and after reducing the luminous gain, reactivate (270) the photocathode and resume the automatic brightness control.

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 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.

A night vision system along with an image intensifier tube having a microchannel plate and method of forming the microchannel plate are provided. The microchannel plate comprises a plurality of spaced channels extending through the microchannel plate, wherein each channel sidewall surface near the input face of the microchannel plate comprises a series of layers formed thereon. The input face of the microchannel plate, as well as the sidewall surfaces of each channel near the input surfaces, are configured with an electron backscatter layer arranged between a contact metal layer and a secondary electron booster layer. When formed partially into the channel openings near the input face, the electron backscatter layer and overlying secondary electron booster layer are configured circumferentially around the sidewall surfaces and extend radially inward toward a central axis of each channel.

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.

A photocathode epitaxial structure. The photocathode epitaxial structure includes a binary compound substrate material. The photocathode epitaxial structure further includes an active device absorber layer forming a portion of a p-type device photocathode formed on the binary compound substrate material. The active device absorber layer comprising at least a quaternary or greater material structure configured to be lattice matched with the substrate material to reduce strain to allow charge carriers to go further in the active device absorber layer implemented in the photocathode of a nightvision system.

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.

A night vision system along with an image intensifier tube and method for forming the tube are provided. The night vision system incorporates the image intensifier tube in both an analog channel as well as a digital channel, with an addressable display within the analog image intensifier tube analog channel configured to create an electronically addressable output. An analog image intensifier tube is included in the digital imager for presenting binary digital signals representative of an image, or of symbol indicia, and registering those digital representation from the digital imager onto one or more electron multipliers of the analog image intensifier tube within the analog channel. The provided night vision system also utilizes a cathodoluminescent screen, which is a highly efficient light source that reduces system power.

A photocathode epitaxial structure. The photocathode epitaxial structure includes a binary compound substrate material. The photocathode epitaxial structure further includes an active device absorber layer forming a portion of a p-type device photocathode formed on the binary compound substrate material. The active device absorber layer comprising a material structure configured to be lattice matched with the substrate material to reduce strain to allow charge carriers to go further in the active device absorber layer implemented in the photocathode of a nightvision system.

The invention elates to a system for protecting photomultiplier in eye imaging comprising an optical measuring system (1), comprising a light level detector (13) in a vicinity of a photomultiplier (11) which is protected by means for blocking the input aperture (14), the optical measuring system being connected in an airtight manner to a front side (21) of the non-transparent head chamber (2) with airtight fastening of the bottom side (22) around patient's jaw, neck or arms, wherein the optical measuring system also comprises a chinrest (15) and the light level detector (13) is preset with maximum acceptable threshold value, above which the means for blocking the input aperture (14) block the light on the photomultiplier.

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.

Image intensifier systems incorporating a microchannel plate (MCP) and methods for producing the same are disclosed. In some examples, a device is disclosed that includes a first substrate having a radiation-receiving first surface and an opposed second surface through which electromagnetic radiation is transmitted. A second substrate is coupled to the first substrate to define a vacuum cavity therebetween. An electron-emitting photocathode is disposed within the vacuum cavity for generating electrons from electromagnetic radiation transmitted through the second surface. A microchannel plate is disposed within the vacuum cavity and defines microchannels extending from an input end to an output end. Each of the microchannels is configured to generate electrons in response to an electron generated by the photocathode being received through the input end of the respective microchannel. A phosphorescent layer also is disposed within the vacuum cavity and adjacent the output ends of the microchannels of the microchannel plate.

A nightvision system includes an underlying device that provides output light in a first spectrum. A transparent optical device transmits light in the first spectrum from the underlying device through the transparent optical device. The transparent optical device includes an active area of a semiconductor chip. The active area includes active elements that cause the underlying device to detect light from the underlying device and transparent regions formed in the active area which are transparent to the light in the first spectrum to allow light in the first spectrum to pass through from the underlying device to a user. An image processor processes brightness maps produced using light detected by the first plurality of active elements. A tunable filter array coupled to the image processor filters at least a portion of the input light into the underlying device the underlying device based on brightness map processing.

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 relates to a colour image intensifier tube (13) comprising the following elements: - an input window (15); - a first filter (30) attached to an external face of the input window; - a microlens array (32) attached to the first filter; - a photocathode (16) attached to an internal face of the input window; - an electron multiplier (18); - a phosphorescent screen (20); - an optical output interface (21); and - a second filter (31), comprising the same set of pixels as the first selective filter, attached to the output interface.

A system for identifying at least one beacon (B) comprising night vision binoculars or a scope incorporating an image amplifier tube (13). The image amplifier tube (13) comprises a diffraction grating (20) placed between an input window (15) and a photocathode (16) so as to diffract the photons in said photocathode and to allow the photocathode to have a quantum efficiency (QE):– greater than 1% in an image formation wavelength range and;– between 0.001 and 1% in a detection wavelength range, distinct from said image formation wavelength range, said detection wavelength range being at least between 1050 nanometers and 1075 nanometers; the image amplifier tube being configured to capture electromagnetic radiation emitted by said beacon in said second detection wavelength range. Figure for abstract: Fig 5

The invention relates to a photodetector comprising a support layer (10), a lattice structure (20) and an active layer (30). The lattice structure (20), referred to as photonic crystal structure, comprises a structured layer (22) formed of patterns (22.1) and of a continuous sublayer (22.2) with a non-zero constant thickness eccs, the patterns (22.1) widening in a direction oriented towards the continuous sublayer (22.2). Moreover, the photonic crystal structure (20) has dimensions such that the structured layer (22) forms a photonic crystal that supports at least one guided mode able to be excited by the incident light radiation of interest, the photonic crystal being 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).

The utility model discloses a large-aperture high-gain image intensifier and a low-light vehicle-mounted night vision system thereof. The large-aperture high-gain image intensifier comprises a high-performance super second-generation image tube, a first-generation image tube, an amplification light cone and a high-voltage power supply, the cathode input window end face of the high-performance super second-generation image tube extends out of the end face of the shell, and the other end of the high-performance super second-generation image tube is coupled with one end of the first-generation image tube; the other end of the first-generation image tube is coupled with the small end face of the amplification light cone; the large end face of the amplification light cone extends out of the other end face of the shell. Practical application verifies that compared with a second-generation inverted image type image intensifier, the sensitivity of the device reaches 850 [mu] A / lm (the sensitivity of the second-generation inverted image type 25 mm image intensifier is 240 [mu] A / lm), the resolution of the device reaches 45 lp / mm (the sensitivity of the second-generation inverted image type 25 mm image intensifier is 28 lp / mm), and the maximum brightness gain of the device reaches 30000-50000 cd / m < 2 > / lx (the maximum brightness gain of the second-generation inverted image type 25 mm image intensifier is 9500-22300 cd / m < 2 > / lx).

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.