29results about "Electron multiplier details" patented technology

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.

An electron tube is provided in which electrons emitted from an electron emitting section can be reliably made to reach an electron multiplier section, and the electrons can be reliably multiplied in the electron multiplier section. [Solution] The electron tube (1) comprises an electron emitter (3) including a metasurface (32) that emits electrons in response to incidence of electromagnetic waves (W), an electron multiplier (4) that multiplies the electrons emitted from the electron emitter (3), and a first mesh electrode (5) arranged between the electron emitter (3) and the electron multiplier (4). The electron multiplier (4) has an electron incidence region (4a) onto which the electrons emitted from the electron emitter (3) are incident. The distance α between the metasurface (32) and the electron incidence region (4a) is smaller than the width β of the electron incidence region (4a).

The application provides a full fluorescence yield detector for in-situ soft X-ray absorption spectroscopy, which is based on a photomultiplier and can collect weak fluorescence signals excited by soft X-rays under in-situ conditions (reactions under simulated complex environment conditions). A large-diameter photomultiplier is used and the top angle of the detector is improved to increase the fluorescence collection angle as much as possible to improve the signal strength; double gold meshes are used and different voltages are added to shield interference signals such as photoelectrons and positive ions of non-fluorescence yield at the same time; a spliced half-cylinder barrel design is used to realize shielding and facilitate maintenance and replacement of the photomultiplier; a spring and rubber pad are used in cooperation with a screw to fasten the mode, which can maintain good electrode contact while avoiding overpressure damage to the photomultiplier and can work stably in a vibrating environment. The application optimizes the detector from the aspects of the structure of the detector, detection efficiency, signal interference shielding, maintenance convenience and the like.

The invention discloses a hybrid photomultiplier coaxial output structure based on a microstrip line. The hybrid photomultiplier coaxial output structure comprises a semiconductor detector, a bonding wire, the microstrip line, a ground electrode, a lead pin, a medium, an outer conductor base and a detector lead pin. The semiconductor detector is used for receiving the photoelectrons converted by the photoelectric cathode and generating a current signal; the bonding wire is used for electrically connecting the semiconductor detector and the microstrip structure; the microstrip line and the ground electrode adopt gold-plated kovar alloy parts to form an in-tube microstrip structure; the guide pin and the detector guide pin are kovar alloy guide pins and form an inner conductor with a coaxial structure; the outer conductor base is a kovar alloy disc and forms an outer conductor with a coaxial structure; the medium is glass or ceramic. According to the coaxial output structure, a vacuum tube is of a 50-ohm microstrip structure, the exterior of the vacuum tube is of a 50-ohm SMA coaxial structure, and a complete 50-ohm coaxial line is formed by connecting a microstrip line and a guide pin together. The structure provided by the invention has the advantages of high transmission speed, small signal reflection and oscillation and the like, and is more beneficial to detection of ultrafast optical pulse signals.

Provided is an electron tube comprising: an electron emitting part including a metasurface that emits electrons in response to incidence of electromagnetic waves; an electron multiplying part that multiplies the electrons emitted from the electron emitting part; and a first mesh electrode disposed between the electron emitting part and the electron multiplying part. The electron multiplying part has an electron incident region on which the electrons emitted from the electron emitting part are incident. The distance between the metasurface and the electron incident region is inferior to the width of the electron incident region.

The invention provides a high-efficiency X-ray imager containing a built-in transmission line and a preparation method of the high-efficiency X-ray imager. A conductive strip is arranged on the input surface of a lower micro-channel plate, conductive strips are arranged on the input surface and the output surface of an upper micro-channel plate, and the output surface of the upper micro-channel plate is oppositely attached to the input surface of the lower micro-channel plate; the conduction band strip units on the two faces are in one-to-one correspondence, and the micro-channels of the two micro-channel plates are in butt joint to form the micro-channel plate assembly. According to the micro-channel plate assembly, the two groups of micro-channels are in butt joint with each other, the gain is improved, detection of weak electronic signals is met, meanwhile, the design of the conductive strips and the built-in transmission lines formed by the conductive strips is combined, multi-mode polaritons are excited under the single frequency, and the requirement for parallel processing of multi-dimensional information is met.

The invention discloses a time spectrometer system and method based on a microchannel plate photomultiplier (MCP-PMT). The constant proportion discriminator is triggered by adopting an attenuation branch / delay branch differential zero crossing point, and performs latch width limiting and level conversion on a trigger pulse; fPGA-based multi-level carry chain time TDC is adopted, and parallel tap sampling, bubble suppression and code density calibration table look-up correction are carried out; a processing flow of time window histogram accumulation, a first effective hit strategy, a background adaptive threshold and multi-peak positioning and fitting is adopted. According to the invention, the picosecond-level timing precision is obtained at a low clock rate, the sensitivity and precision of weak light signal flight time distance measurement are significantly improved, and the method is suitable for laser radar imaging and high time sequence of time correlation single photon counting, can realize sub-hundred picosecond-level time resolution, and is suitable for flight time distance measurement under a weak light condition.

The invention relates to edge-covered glass for a micro-channel plate, a preparation method of the edge-covered glass and the micro-channel plate, and belongs to the field of glass for micro-channel plates. The composition for the edge-covering glass for the micro-channel plate comprises the following raw materials in percentage by mass of oxides: 52-70% of SiO2; 4 to 6 percent of Al2O3; 1 to 3% of Y2O3; 4 to 6 percent of K2O; 2 to 4 percent of Na2O; the sum of the contents of the Nb2O5 and the MoO3 is 14 to 22 percent; the sum of the content of MgO and the content of CaO is 5-8%. Specific components are selected, and the ratio of the components is adjusted, so that the edge-covered glass has a relatively strong framework, the bending strength is greater than or equal to 70MPa, the transformation temperature Tg is greater than or equal to 650 DEG C, the softening temperature Tf is greater than or equal to 710 DEG C, and the thermal expansion coefficient is 75-80 * 10 <-7 > / DEG C; and the glass is better matched with third-generation leather glass. The obtained micro-channel plate is not deformed or damaged after being prepared in a whole process.

The invention relates to the technical field of optical detectors, and provides an optical detector potting method and a potting tool. The optical detector potting method comprises the following steps: S110, potting a pretreated glue solution into an annular gap to obtain a first potting assembly, and sealing and buckling an upper half cabin body to a lower half cabin body to obtain a second potting assembly; s120, negative pressure pumping is conducted on the interior of the second filling and sealing assembly till the pressure reaches the first set pressure intensity, and pressure maintaining is conducted for the first set duration according to the pressure intensity; s130, after pressure maintaining is completed, pressure maintaining aftertreatment is conducted; repeating the step S110 to the step S130 for N times until the annular gap is filled with the glue solution; after the first to (N-1) th pressure maintaining is completed, gradually releasing vacuum within a second set time period to gradually recover the interior of the glass ball cabin to the standard atmospheric pressure, and after the Nth pressure maintaining is completed, gradually releasing vacuum within a third set time period to gradually recover the interior of the glass ball cabin to the second set pressure intensity, and maintaining the pressure for a fourth set time period, the pressure intensity of the second set pressure intensity is greater than the first set pressure intensity.

To provide a light detection unit capable of suppressing a conductive material for grounding from interfering with a photomultiplier tube, and a radiation detector.SOLUTION: A light detection unit 10 includes a photomultiplier tube 11, a circuit part 12, a housing 13, and an elastic conductive member 14. The housing 13 houses the photomultiplier tube 11 and the circuit part 12. The circuit part 12 has a ground terminal 12a to which reference potential is supplied from outside. The elastic conductive member 14 connects a grounding part 13a inside the housing 13 and the ground terminal 12a. A state in which the photomultiplier tube 11 and the circuit part 12 are housed inside the housing 13 is a state that a length between both ends of the elastic conductive member 14 is at least a natural length and a restoring force of at least zero acts between both ends of the elastic conductive member 14.SELECTED DRAWING: Figure 1

A charged particle beam device includes: a stage 124 on which a sample 108 is to be placed; a charged particle optical system including a charged particle source 113 and an objective lens 121 that focuses a charged particle beam from the charged particle source onto the sample; and a detector 123 disposed between the objective lens and the stage and configured to detect electrons 109 emitted by an interaction between the charged particle beam and the sample. The stage, the charged particle optical system, and the detector are housed in a vacuum housing 112, and the detector includes a scintillator 107, a solid-state photomultiplier tube 104, and a light guide 106 provided between the scintillator and the solid-state photomultiplier tube, and an area of a light receiving surface of the scintillator is larger than an area of a light receiving surface of the solid-state photomultiplier tube.

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

A photodetector comprising: an incident surface plate on which a photoelectric surface is formed which emits photoelectrons according to the incident light;and a semiconductor element arranged to face the photoelectric surface along a first direction and configured to detect photoelectrons emitted by the photoelectric surface, wherein the semiconductor element: has a first section with an electron-incidence surface facing the photoelectric surface and containing a plurality of channels spaced apart from one another along a second direction intersecting the first direction, and comprises a second section arranged at least at both end faces of the electron-incidence surface in the second direction and being thicker than the first section by projecting towards the side of the photoelectric surface relative to the electron-incidence surface.

The invention discloses a photomultiplier tube packaging device and method, and particularly relates to the technical field of photomultiplier tube packaging, the photomultiplier tube packaging device comprises a base, a photomultiplier core assembly is fixedly installed on the base, a pin of the photomultiplier core assembly penetrates through the base, a glass cover window is arranged at the top end of the base, and the glass cover window is arranged on the base. The photoelectric multiplication core assembly is packaged between the glass cover window and the base in a vacuum mode, a sealing bottom frame is arranged at the bottom end of the base, a packaging top cover is arranged at the top end of the sealing bottom frame, the glass cover window is located in the packaging top cover, and shielding layers are arranged on the inner walls of the sealing bottom frame and the packaging top cover. A side window is formed in one side of the packaging top cover, a cooling part is arranged on the side, away from the side window, of the packaging top cover, the photomultiplier core assembly is packaged through the base, the sealing bottom frame and the packaging top cover, multi-stage sealing of the photomultiplier core assembly can be achieved, and therefore the packaging effect of the whole photomultiplier is improved.

The utility model relates to a mechanical installation structure of a small electron multiplier. The mechanical installation structure is composed of a shell, a photomultiplier plate, a pressing plate, a protection cover and an insulation screw. The shell comprises a middle circular hollow area and an embedded area; the photomultiplier plate is fastened with a photomultiplier plate mounting screw hole in the bottom wall of the embedded region through an insulating screw; the pressing plate is placed at the upper part of the photomultiplier plate and is fastened with the pressing plate screw holes in the bottom wall of the embedded area through insulating screws; and the protective cover is fastened with the protective cover mounting screw holes in the outer side of the step avoiding part of the embedded area through insulating screws. The mechanical installation structure of the small-sized electron multiplier is simple in design and small in size, can be installed in a narrow detection space, and meets the requirements of special fields requiring electronic amplification. And an innovative voltage applying design is adopted, so that the problem of applying voltage to the photomultiplier plate which is low in thickness and brittle in material is solved.

An electron tube capable of improving resistance to vibration or impact is provided. [Solution] The electron tube 1 comprises a housing 2 having a window 21a that transmits electromagnetic waves W, an electron emitter 3 that is disposed within the housing 2 facing the window 21a and includes a metasurface 32 that emits electrons on the side opposite the window 21a in response to the incidence of the electromagnetic waves W, and an electron multiplier 4 that is disposed within the housing 2 on the side opposite the window 21a with respect to the electron emitter 3 and multiplies the electrons emitted from the electron emitter 3. The electron multiplier 4 is fixed to the housing 2. The electron emitter 3 is fixed to the electron multiplier 4.

The invention discloses a wavelength-tunable photomultiplier detector based on an optical microcavity, which is used for solving the problems of complex structure, low light utilization efficiency and the like of the traditional silicon-based RGB three-color detector. The wavelength tunable photomultiplier detector based on the optical microcavity comprises a transparent electrode ITO, a hole transport layer PEDOT: PSS, an organic active layer P3HT: PC71BM (100: 1, w / w), a metal electrode Al and the optical microcavity which are sequentially arranged from bottom to top, and the structure of the optical resonance microcavity is Ag / LiF / Ag. According to the device, a trap auxiliary multiplication mechanism in a photomultiplication detector and a spectrum narrowing regulation and control function of an optical microcavity are integrated, so that the detection wavelength can be tuned, and a response spectrum can be limited to three characteristic narrow bands, namely, RGB (Red, Green, Blue). By means of the obvious photomultiplication effect in the RGB wave band, the responsivity and the quantum efficiency are improved by more than two orders of magnitude compared with those of a traditional RGB detector without a multiplication mechanism, and an effective solution is provided for weak light detection.

The utility model provides a photomultiplier tube device, which solves the problems that the existing photomultiplier tube is poor in cooling efficiency and affects the working performance of the photomultiplier tube, and comprises a thermal insulation layer and a refrigeration module, an electromagnetic shielding tube is arranged in the thermal insulation layer, and the photomultiplier tube is inserted on a tube seat and arranged in the electromagnetic shielding tube; the heat preservation layer is further provided with an opening, and the end, away from the pipe base, of the electromagnetic shielding pipe is attached to the refrigeration module through the opening of the heat preservation layer. Through the opening design of the heat preservation layer, the refrigeration module is directly and tightly attached to the electromagnetic shielding pipe, the size of the opening of the heat preservation layer is matched with the attaching size of the refrigeration module and the electromagnetic shielding pipe, direct and efficient heat transfer is achieved, meanwhile, temperature control over the environment where the photomultiplier is located is achieved, and it is guaranteed that the working temperature is stable; therefore, the detection result of the photomultiplier is accurate and reliable.

A photodetector is provided with: an incident panel on which a photoelectric surface that emits photoelectrons in response to incident light is formed; and a semiconductor element for detecting the photoelectrons released from the photoelectric surface, the semiconductor element having: a first portion having an electron incident surface, which is a surface facing the photoelectric surface, the electron incident surface being a surface facing the photoelectric surface, the electron incident surface being a surface facing the photoelectric surface, and the electron incident surface being a surface facing the photoelectric surface; comprising a plurality of channels arranged at intervals along a second direction crossing the first direction; and a second portion provided at least on both end sides of the electron incident surface in the second direction, and formed to be thicker than the first portion by protruding further toward the photoelectric surface side than the electron incident surface.

The application relates to a gradient-diameter micro-channel plate and a preparation method and application thereof, wherein the steps of the preparation method comprise the following: preparing a sheet-shaped base plate from a transparent material; using a femtosecond laser to process a tapered array of micro-holes on the base plate to obtain a gradient-diameter base plate; when the tapered array of micro-holes is processed, the entrance end is first etched to form an opening, and then the diameter is uniformly shrunk step by step to the exit end, and the diameter of the entrance end is larger than that of the exit end; the ratio of the hole depth of the tapered array of micro-holes to the diameter of the exit end is 30-200, and the taper angle is 1-5 DEG; an Al2O3-SiO2-B2O3 sol containing Cs is prepared, is uniformly coated on the inner wall of the tapered array of micro-holes, and is subjected to hydrogen reduction to obtain a micro-channel blank plate; electrodes are plated on both ends of the micro-channel blank plate to obtain the gradient-diameter micro-channel plate. The gradient-diameter micro-channel plate provided by the application has the advantages of high gain and low noise, and is more suitable for practical use.

The application discloses a high-sensitivity detector for day-blind ultraviolet band electronic fluorescence excitation, which comprises a vacuum chamber, a nano-tip combination, a micro-channel plate, an aluminized fluorescent screen, a fiber-optic light cone and a photosensitive element assembly. ‑ 6 mBar~9*10 ‑6 mBar, wherein the ultraviolet incident window, the nano-tip combination, the micro-channel plate, the aluminized fluorescent screen and the visible light output window are sequentially arranged; the nano-tip combination comprises a substrate and a nano-tip array, and the nano-tip array comprises a plurality of nano-tip structures arranged in an array; the tip of each nano-tip structure points to the micro-channel plate; the fiber-optic light cone is arranged between the aluminized fluorescent screen and the photosensitive element assembly, one end of the fiber-optic light cone is connected with the aluminized fluorescent screen, and the other end is connected with a photosensitive element mounting plate. The application can form multiplied electrons. The accelerated electrons excite the aluminized fluorescent screen to generate strong visible light, thereby realizing high-sensitivity detection of ultraviolet band conversion.

The invention relates to the field of photoelectronic devices, and discloses a dustproof and waterproof sealing cover for a photoelectronic device, which comprises a sealing cover body, a base is arranged on the lower surface of the sealing cover body, a first reset spring is arranged in the sealing cover body, a buffer assembly is arranged on the outer wall of the first reset spring, and the buffer assembly is connected with the base. A limiting assembly is arranged on the lower surface of the sealing cover body, heat dissipation fins are arranged on the upper surface of the base, the heat dissipation fins are connected with a buffering assembly, a photoelectronic device body is arranged on the upper surfaces of the heat dissipation fins, and a cooling assembly is arranged in the base. The heat of the photoelectronic device body is transmitted to the base through the heat dissipation fins, so that the effects of continuously dissipating heat of the photoelectronic device body, keeping the photoelectronic device body at a stable working temperature, improving the working efficiency, avoiding heat accumulation of the photoelectronic device body and preventing the photoelectronic device body from being damaged by high temperature can be achieved.

Provided is an electron tube comprising: a housing having a window part that transmits electromagnetic waves; an electron emitting part that is disposed inside the housing so as to face the window part, and that includes a metasurface emitting electrons to the opposite side of the window part in response to incidence of the electromagnetic waves; and an electron multiplying part that is disposed inside the housing so as to be positioned on the opposite side of the window part with respect to the electron emitting part, and that multiplies the electrons emitted from the electron emitting part. The electron multiplying part is fixed to the housing, and the electron emitting part is fixed to the electron multiplying part.

This light emitting body (10) converts incident charged particles into light, and is provided with a multiple quantum well structure (14C) that emits light by the incidence of charged particles. The well layer (141) constituting the multiple quantum well structure (14C) has a thickness of 0.2 nm or more and less than 1.5 nm. The concentration of an additive added to a barrier layer (142) and a well layer (141) constituting the multiple quantum well structure (14C) is greater than 4 * 1018 cm <-3 > and 1 * 1020 cm <-3 > or less.

An electron tube is provided in which electrons emitted from an electron emitting section can be reliably made to reach an electron multiplier section and the electrons can be reliably multiplied in the electron multiplier section. [Solution] The electron tube (1) comprises an electron emitter (3) including a metasurface (32) that emits electrons in response to incidence of electromagnetic waves (W), an electron multiplier (4) that multiplies the electrons emitted from the electron emitter (3), and a first mesh electrode (5) arranged between the electron emitter (3) and the electron multiplier (4). The electron multiplier (4) has an electron incidence region (4a) onto which the electrons emitted from the electron emitter (3) are incident. The distance α between the metasurface (32) and the electron incidence region (4a) is smaller than the width β of the electron incidence region (4a).

A light-emitting body is a light-emitting body that converts incident charged particles into light and includes a multiple quantum well structure for emitting the light upon incidence of the charged particles. A thickness of a well layer constituting the multiple quantum well structure is equal to or greater than 0.2 nm and less than 1.5 nm. A concentration of an additive added in a barrier layer and the well layer constituting the multiple quantum well structure is higher than 4 × 1018 cm-3 and equal to or lower than 1 × 1020 cm-3.

The utility model discloses a positioning and crimping device for PMT sealant pouring in a mass production stage, which comprises a bottom supporting plate, a tool base is arranged on the upper side of the bottom supporting plate, an inner hexagonal countersunk head screw is arranged between the tool base and the bottom supporting plate, and the tool base is connected with the bottom supporting plate. A second supporting positioning pin and a first supporting positioning pin are arranged on the upper side of the tool base, a pipe base positioning plate is arranged at the upper end of the second supporting positioning pin and the upper end of the first supporting positioning pin, four screws are arranged on the upper side of the pipe base positioning plate, and pipe base pressing plates are arranged on the outer sides of the upper ends of the screws. Through the arrangement of the pipe base positioning plate, the pipe base pressing plate, the first supporting positioning pin, the second supporting positioning pin, the screw, the compression spring and the rotary knob, the supporting positioning pins of different lengths and the pipe base positioning plates of different sizes are used for adapting to different types of PMT pipes, the fixing rotary knob capable of being repeatedly positioned is used for determining the final positioning height, hard limiting of the pipe base pressing plate is provided, and the positioning precision of the PMT pipes is improved. And the PMT tube to be crimped is prevented from being damaged.