120 results about "Particle detector" patented technology

The invention relates to the technical field of particle detectors, in particular to a signal acquisition, processing and analysis method and system for a particle detector array, and the method comprises the following steps: segmenting a channel amplitude, marking a stable segment by using a range ratio threshold value, calculating a difference ratio, screening monotonically rising channel marking transition, extracting an earliest excitation channel as a starting point, and carrying out signal processing. And retrieving adjacent channel screening time differences in the window as candidates, and taking the channel with the angle change smaller than a threshold value as a trunk section according to time sequence to generate a path structure. According to the method, the amplitude range of a channel in a fixed period is extracted, a stable signal segment is screened, preliminary signal structuring is completed, a rising trend channel is identified through a difference ratio, the first excitation time is extracted to establish a space starting point index, and path candidates are screened in combination with the time difference of adjacent channels and states. Path trunk segments consistent in direction are extracted through angle change analysis, particle path reconstruction is achieved, multi-dimensional parameters synergistically improve the recognition precision, the analysis capability is enhanced, and the misjudgment rate is reduced.

The invention relates to the related technical field of air quality detection, and discloses an air quality detection device with an adjusting function, the air quality detection device comprises a shell, one side of the interior of the shell is provided with a dust detector, a harmful particle detector and an oil-water particle detector, and the other side of the interior of the shell is provided with a purification assembly and a processor; the surface of the adsorption plate can be heated through the temperature of inert gas to desorb adsorbate, and the purging effect of the inert gas is combined; and a plurality of round pipes and cleaning pieces are utilized to repeatedly move back and forth in multiple directions in the vertical direction, so that the cleaning pieces are matched with hot air to clean the surface of the adsorption plate. And a plurality of round pipes and the movable frame are utilized to repeatedly move back and forth in multiple directions, so that hot air in the movable frame can be sprayed to the surface of the adsorption plate in a diffusion manner, the surface of the adsorption plate is conveniently covered, and cleaning dead corners are avoided.

The utility model discloses a pyrolytic particle detector, which comprises a mounting seat, a pyrolytic particle detector, a pyrolytic particle detector and a detector body, the elastic clamping assemblies are arranged on the two sides in the mounting groove; a connecting base is fixedly arranged at the top of the shell, clamping holes are formed in the two sides of the connecting base, an embedding groove is formed in the bottom of the shell, air inlet holes are evenly distributed in the bottom of the shell, and air outlet holes are evenly distributed in the two sides of the shell; the unlocking assembly is arranged in the caulking groove and extends into the connecting seat; and the pyrolysis particle detection mechanism is fixedly arranged in the shell. The pyrolytic particle detector is convenient to install and replace, the application convenience of the pyrolytic particle detector is improved, the early characteristics of a fire disaster can be accurately detected, and the safety of a power distribution cabinet is ensured.

The invention discloses a lunar dust protection system for a low-energy particle detector. The lunar dust protection system comprises a protective cover, a nitrogen blowing opening, a pressing device, an unfolding device, a power supply subsystem and a control subsystem, wherein the protective cover and the nitrogen blowing opening are integrally designed; the protective cover covers the head of the sensor and is consistent with the head of the sensor in shape; the nitrogen blowing port blows nitrogen into the sensor in a ground test stage to prevent pollution; the blocking cap is used for blocking before the satellite is launched to prevent dust pollution; when the system is in a protection state, the pressing device presses the protective cover and the head of the sensor, and the protective cover is released through thermal cutting according to an instruction of the control subsystem; the unfolding device is matched with the pressing device to achieve unfolding of the protective cover, and the protective cover is locked after being released to a designated position. The power supply subsystem supplies power to the pressing device according to an instruction of the control subsystem; the control subsystem periodically collects state monitoring parameters and transmits the state monitoring parameters to the load management unit, controls power-on and power-off of the pressing device according to a ground remote control instruction, and executes unfolding operation of the system.

Systems and methods of imaging a sample using a charged-particle beam apparatus are disclosed. The charged-particle beam apparatus may include a charged-particle source configured to generate primary charged particles, the primary charged particles forming a primary charged-particle beam along a primary optical axis, and a charged-particle detector comprising a plurality of con-centric segments of a charged-particle sensitive material configured to detect charged particles emitting from a sample after interaction of the primary charged-particle beam with the sample, wherein each segment of the plurality of concentric segments is configured to collect the emitted charged particles having a range of energy levels and a dominant energy level.

The application relates to a power distribution system fire early warning device based on pyrolysis particle detection and a mounting method, which comprises a pyrolysis particle detection device including a sampling part and a monitoring part, the monitoring part includes a pyrolysis particle detector, the sampling part includes a multi-pass connector and a plurality of wind receivers, the multi-pass connector has a plurality of sample inlet joints and a sample outlet joint, and each wind receiver is connected with a sample inlet joint; the pyrolysis particle detector is connected with the sample outlet joint through a pipeline; the wind receiving pipe is fixed on the position facing the heat dissipation fan through a mounting plate and a supporting rod, the positive pressure formed by the heat dissipation fan on the wind receiving pipe enables the sampling part to collect and detect the air sample from the target power distribution equipment without negative pressure extraction or only with a small negative pressure; more negative pressure equipment does not need to be configured due to the increase of the pipeline, the cost is reduced, the multi-pass connector increases the interface flexibility, the pipeline is conveniently expanded in the later period, and the monitored power distribution equipment is increased.

The application discloses a thin window sealing method of a particle detector, which comprises the following steps: arranging a clamp on a device support, clamping a thin window by using a sealing assembly, clamping the sealing assembly by using the clamp, fixing the clamp on the device support, and welding the sealing assembly by using a welding device, wherein the clamp is continuously and uniformly rotated during the welding until the thin window to be sealed is completely sealed in the sealing assembly. The clamp is used to press the sealing assembly and the thin window clamped by the sealing assembly, so that the tightness and the sealing property of the sealing assembly during subsequent welding are guaranteed. The clamp is fixed to fix the sealing assembly and the thin window to be sealed, so that the position stability of the sealing assembly and the thin window to be sealed during the welding of the sealing assembly is guaranteed. Meanwhile, the clamp is continuously and uniformly rotated during the welding of the sealing assembly, so that the welding points present the shape of fish scale welding, the uniformity of the welding points is guaranteed, the structural strength of the welding position is improved, and then the structural strength of the sealed thin window is improved, so that the thin window is not prone to deformation.

This application relates to a high-precision timing system and method based on dual-channel time measurement. The system includes: a filtering module for receiving analog signals output from a particle detector, filtering and denoising the analog signals, and converting the processed signals into two co-source valid signals for output; a time measurement module for receiving the two co-source valid signals, and by configuring a first discrimination threshold and a second discrimination threshold, performing discrimination processing on the two co-source valid signals respectively, capturing the characteristic time when each signal reaches the corresponding discrimination threshold, and outputting the first characteristic time and the second characteristic time; and a data processing module for calculating and storing the high-precision arrival time based on the approximately linear characteristics of the rising edge of the signal pulse, according to the first discrimination threshold, the second discrimination threshold, the first characteristic time, and the second characteristic time. Using this system, particle arrival time measurement can be achieved with both stability and high precision, meeting the application requirements of high-precision timing scenarios.

A novel method and a related system are configured to place measured trajectories into a voxel space, which moves with respect to a particle detector system. The trajectories are measured in a detector reference frame. The voxel space, typically fixed with respect to the object being imaged, is tracked optically with markers and a camera system. A decipherable correlation is established between a set of markers and a set of detector elements. This correlation provides coordinate transformation definitions to place the trajectories into the voxel space in medical imaging, treatment planning, and / or therapeutic applications. The novel method provides a clever process to register an optical tracking system with a particle detector system, which improves quality assurance, accuracy, speed, and operating cost efficiencies of ion, particle, and / or radiation-based imaging, treatment planning, or therapies. This novel method may be utilized in proton imaging, helium imaging, other ion-based imaging, or x-ray imaging.

Disclosed is a particle detector comprising: - a semiconductor substrate comprising a sensitive volume for producing charges on passage of a particle, at least one front contact island under a front side of the substrate, and at least one back contact island under a back side of the substrate, - at least one front electrode making contact with the front contact island; - at least one back electrode making contact with the back contact island; - an acquisition chain for detecting transient signals coming from the front electrode. The front electrode is an electrode for applying voltage and detecting transient signals. It is produced on only part of the front side of the semiconductor substrate, without guard electrodes, such that a non-uniform electric field is created in the sensitive volume when the electrode is supplied with a voltage.

The application discloses a water body radioactivity online monitoring system and a monitoring method, and relates to the technical field of water body radioactivity monitoring. The monitoring system comprises a probe device, a probe driver and signal processing device and a data processing device. The probe device comprises a beta particle detector and a gamma ray detector, and is used for detecting beta particles and gamma rays in a water body and outputting detection signals. The probe driver and signal processing device is electrically connected with the beta particle detector and the gamma ray detector, and is used for receiving the detection signals, processing the detection signals and outputting detection data. The data processing device is electrically connected with the probe driver and signal processing device, and is used for receiving the detection data and analyzing the detection data to obtain a monitoring result. The system provided by the application can realize online real-time monitoring of water body radioactivity, and can realize monitoring of water body nuclide content and identification of nuclides.

The utility model belongs to the field of electron beam detection, and relates to a particle detector adjusting device, comprising a sealed container, one end of which is sealed by a fixed pedestal, and the upper wall and the lower wall of which are provided with electron beam holes; the fixed base is connected with the electrode adapter in the sealed container through a corrugated pipe in a vacuum sealing welding manner; an adjusting piece is installed in an adjusting hole of the fixed base, and the other end of the adjusting piece is screwed into a blind hole of the electrode adapter and used for controlling stretching and retracting of the corrugated pipe. A particle detector is installed on the electrode adapter and provided with a detection hole. The expansion and contraction of the corrugated pipe are controlled through the adjusting piece, so that the front-back fine adjustment of the particle detector is realized, the detection hole and the electron beam hole are coaxially aligned, the adjusting efficiency and reliability are improved, and the device is suitable for electron beam detection equipment in various high-precision occasions.

The invention provides an improved camera for electron diffraction pattern analysis, and particularly relates to a device for detecting a Kikuchi diffraction pattern. The apparatus comprises: an electron column adapted to provide, in use, an electron beam directed toward the sample, the electron beam having an energy in the range of 2 keV to 50 keV, and; an imaging detector for receiving and counting electrons from the sample due to the interaction of the electron beam with the sample, the detector comprising an array of pixels and having a count rate capability of at least 2000 electrons per second for each pixel wherein: the imaging detector is adapted to provide electron energy filtering of the received electrons, the particle detector has an active region and a diffraction pattern for counting received electrons representing said diffraction pattern, and the particle detector has an inert layer on a surface on which electrons enter towards the active region of the detector, where the inert layer disperses the detection energy of 20 keV incident electrons having an energy dispersion of a full width at half maximum of less than 3.2 keV. The invention also provides a method for detecting the Kikuchi diffraction pattern.

A device for detecting particles in a lubricating oil of a machine, comprising a particle separator; at least one particle detector; a bypass conduit for the particle-concentrating oil, fluidly connected to an oil outlet of the particle separator, concentrating the particles; and wherein the at least one particle detector is operatively mounted on the bypass conduit so as to be able to detect particles in the bypass conduit.

The invention provides a high-flow high-temperature high-pressure purification device and method for a liquid xenon detector. The purification device comprises a first gear pump, a first heat exchanger, a second heat exchanger, a high-temperature purifier, a liquefaction module, a third heat exchanger and a second gear pump, and the first gear pump extracts a first liquid xenon medium from the liquid xenon detector and pressurizes the first liquid xenon medium; the pressurized first liquid xenon medium enters a first heat exchanger and a second heat exchanger for heat exchange, and the output first gas xenon medium enters a high-temperature purifier for purification treatment and then becomes a second gas xenon medium to enter the hot side of the second heat exchanger; the second gas xenon medium enters the liquefaction module to be cooled and liquefied, then enters the hot side of the first heat exchanger to be subjected to heat exchange to form a second liquid xenon medium, then enters the hot side of the third heat exchanger to be cooled, and finally returns to the liquid xenon detector after being subjected to pressure regulation through a tenth pipeline, a second gear pump and an eleventh pipeline. The device disclosed by the invention is small in space requirement and large in circulating flow, and can obtain a better purification effect on a high-purity target substance of a rare event particle detector.

The application discloses a signal analysis method and device of a particle detector and a storage medium, and belongs to the technical field of detectors. The method is applied to a particle detector, and the method comprises the following steps: acquiring an initial measurement signal, and determining a first response function based on the initial measurement signal and a pulse voltage; performing full-peak fitting on the initial measurement waveform based on the first response function, obtaining a first measurement waveform, and determining the amplitude and width corresponding to the initial measurement signal; performing time-frequency transformation on the first measurement signal and the first response function, and determining an input signal; determining initial parameters of a first filter function based on the input signal, and optimizing the initial parameters; filtering the input signal to obtain an output signal; and performing time-frequency inverse transformation on the output signal to determine the starting time corresponding to the initial measurement signal. Through signal reconstruction on the initial measurement signal, the application can improve the accuracy of the obtained waveform information, so that the signal can be accurately analyzed.

The invention relates to an improvement method for adsorbed particles in a test process of a particle detector, which belongs to the technical field of semiconductor wafer detection equipment and comprises the following operation steps: 1, simultaneously starting a fan and a high-pressure generator; and secondly, the fan sucks air into the air collecting pipe, and the air is blown out downwards through the air outlet pipes to generate airflow. And 3, applying high voltage to the spray point by the high-voltage generator. Under the action of a strong electric field of the needle tip, air flowing through the air outlet pipe is ionized to form airflow containing a large number of positive and negative ions, namely ion wind. And 4, blowing the ionic wind to the detector below and the air around the detector. Through a fan and high-voltage ionization mode, an active electrostatic neutralization environment is created, the problem of electrostatic adsorption generally faced by a silicon wafer and particle detector in testing is effectively solved, and the device has important significance in improving product quality and detection reliability.

The utility model belongs to the technical field of oil particle detection, and discloses an oil particle detector. The oil particle detector comprises an oil pipe assembly and a detection mechanism. The oil pipe assembly comprises an oil inlet sealing head, an oil outlet sealing head and a connecting shaft, the oil inlet sealing head and the oil outlet sealing head are connected to the two ends of the connecting shaft respectively, and the interiors of the oil inlet sealing head, the connecting shaft and the oil outlet sealing head sequentially penetrate through to form a liquid flow pipeline. First sealing pieces are respectively arranged between the oil inlet sealing head and the connecting shaft and between the oil outlet sealing head and the connecting shaft; the detection mechanism comprises lens sets, the lens sets are arranged in the connecting shaft, a detection slit is formed between the lens sets, oil can sequentially pass through the oil inlet sealing head, the detection slit and the oil outlet sealing head, and second sealing pieces are arranged between the lens sets and the oil inlet sealing head and between the lens sets and the oil outlet sealing head respectively. According to the oil particle detector, the sealing performance can be enhanced, oil leakage or leakage is avoided, the detection precision and accuracy are ensured, and the service life of the oil particle detector is prolonged.

The application discloses a cosmic ray cluster muon navigation positioning point feature extraction method, and relates to the technical field of navigation guidance and control. The steps are as follows: S1, through the upper and lower two particle detectors in the closed navigation area, accumulate and collect muon data penetrating into the navigation area, and obtain muon data for effective imaging through time sequence denoising and spatial filtering; S2, a projection horizontal plane is constructed in the closed navigation area and is divided into a grid, the number of muons penetrating into each cell of the grid and the penetrating point position are determined, the muons affecting imaging in the possible abnormal muons in each cell are identified and deleted; S3, the muon distribution density in each cell on the projection horizontal plane is re-estimated, a color heat map of the navigation area is generated through normalization and color mapping; the method realizes intuitive, clear and efficient color heat map imaging of the navigation positioning hotspot area, reduces the processing difficulty of the muon navigation positioning map, and ensures the identification efficiency and reliability of the navigation positioning feature points.

The invention belongs to the field of neutron tubes, and particularly relates to an alpha particle accompanying neutron tube for security check and a region measurement method based on the neutron tube. The neutron tube comprises a tube shell assembly, an ion source assembly, an acceleration collimation assembly, a deuterium tritium target assembly, a storage and an alpha particle detector, the ion source assembly is mounted at the upper end in the tube shell assembly; the acceleration collimation assembly is installed in the tube shell assembly and located on an output path of the ion source assembly. The deuterium tritium target assembly is installed at the lower end in the tube shell assembly and located on an output path of the acceleration collimation assembly. The storage device is installed at the lower end in the tube shell assembly. A mounting opening is formed in the lower end of the side wall of the tube shell assembly, the alpha particle detector is mounted at the mounting opening of the tube shell assembly, and the receiving surface of the alpha particle detector faces the target surface of the deuterium-tritium target body. According to the invention, the flight direction of neutrons can be determined by detecting the accompanying alpha particles, so that the purpose of regional detection is achieved.

The utility model relates to a laboratory clean operation device capable of monitoring particle cleanliness on line. The laboratory clean operation device is provided with a clean working area; a particle cleanliness monitoring mechanism is arranged in the clean working area, the particle cleanliness monitoring mechanism comprises a particle detector and a collecting pipe arranged in the clean working area, and the particle detector is connected and communicated with one end of the collecting pipe and is configured to detect the particle size and concentration of dust particles in the clean working area; the collecting pipe is provided with a plurality of gas capturing openings opposite to the spraying direction of laminar flow gas; and gas treatment equipment is arranged on the outer side of the clean working area and is configured to feed clean laminar gas into the clean working area after the gas is subjected to cleaning treatment. The device can monitor the air cleanliness in the clean working area in real time, whether the specific cleanliness condition in the clean working area meets the requirements of laboratory operation or not can be known in advance during laboratory operation, and samples, operators and the external environment are prevented from being polluted by dust particles.

The invention belongs to the technical field of semiconductor device preparation, and discloses a zinc oxide / magnesium zinc oxide alpha particle detector and a preparation method. The zinc oxide / magnesium-zinc-oxygen alpha particle detector comprises an aluminum oxide single crystal, a high-resistance magnesium-zinc-oxygen region, a hole conductive oxide layer region, a low-resistance zinc oxide region, an insulating layer, a collecting electrode and a gate electrode. The invention designs the structure of the alpha particle detector with the zinc oxide / magnesium zinc oxide structure, provides an effective and simple process manufacturing technology, solves the preparation problem of the alpha particle detector with the internal gain characteristic, and realizes the development of the novel alpha particle detector with the zinc oxide / magnesium zinc oxide structure.

Device (100) for measuring alpha radiation activity and beta radiation activity of radioactive aerosols of artificial origin enriched on a dust filter (40), comprising: - a first particle detector (10) in the form of an ionization chamber, in particular a pulsed one, which is designed to generate a first count rate depending on the alpha radiation activity, - a second particle detector (20) designed to generate a second count rate depending on the beta radiation activity, and - an evaluation unit (50) designed to determine the alpha radiation activity and the beta radiation activity as a function of the first count rate and the second count rate.

The invention discloses a pyrolysis particle detection method and device, relates to the technical field of pyrolysis particle detection, and solves the problem that existing pyrolysis particle methods are designed and realized based on a laser sensor and a gas sensor; the laser sensor and the gas sensor are high in power consumption, so that additional power supplies need to be added in design and use of the pyrolysis particle detectors, or the number of the pyrolysis particle detectors loaded on a host is reduced, and more negative effects are brought to construction wiring and customer use. A laser sensor and a gas sensor are high in cost under the current technical condition and are not beneficial to popularization and application of products; the scattered light intensity of light scattered by pyrolysis particles is obtained through a pyrolysis particle detection device, and the scattered light intensity is converted into a current signal; analyzing the current signal to obtain the concentration of pyrolysis particles; whether early warning is carried out or not is judged based on the concentration of the pyrolysis particles, and the technical problem is solved.

The application discloses a kind of real-time alpha particle detector optimization design method based on air scintillation, with the lowest detection sensitivity as design goal, through Monte Carlo analysis method, carry out multi-parameter optimization design, specifically through detector modeling, threshold and coincidence logic setting, the detection efficiency calculation of alpha particle, cosmic-ray background and the accidental coincidence count rate calculation of PMT and measurement time setting etc. Steps optimize the system parameters of detector, according to the lowest detection sensitivity lower limit principle, determine optimal detector model, threshold and coincidence logic and measurement time etc. The method is simple and easy to understand, high universality, can solve the problem of low detection efficiency of alpha particle and low signal-to-noise ratio of real-time alpha particle detector based on air scintillation due to low air light yield, reach the lowest detection sensitivity lower limit of alpha particle allowed in actual situation, applicable to the efficient real-time measurement of alpha particle concentration / activity under the condition of low radioactivity level with air scintillation.

The invention discloses a vehicle-mounted portable small particle detection device and detection system, and relates to the technical field of particle detectors, and the device comprises a radiation shielding layer, a radioactive source, a small hole, HDPE, an EJ-276 plastic scintillator, a light guide, an XP3232PMT, a packaging clamp, a BNC signal interface, an SHV high-voltage interface, a BNC coaxial signal line, an SHV high-voltage line, a negative high-voltage power supply, a DAQ, a USB data line and an upper computer. Accurate signal discrimination can be provided under high sensitivity, the peak sensitivity is matched with the emission spectrum of PMT, the signal detection accuracy is ensured, and effective discrimination of neutrons and gamma rays has extremely high application value in the fields of nuclear reactor safety monitoring, nuclear detection and the like.

A first particle detector 60A is positioned on an upper surface and a second particle detector 60B is positioned on a lower surface. The upper and lower surfaces are separated by an overburden. The position of the second particle detector relative to the first is based on detecting a flux of particles 69 through the first particle detector and the second particle detector. The particles may be cosmic ray muons. The measurements at the two detectors may be caused by interactions at each detector from the same particle. Determining the position of the second detector may involve measuring time interval between the detected flux at the two detectors and the trajectory of the flux of particles. The magnitude of the flux may indicate an anomalous region 67 e.g. void in the overburden. The method may be used to determine a map of a void or tunnel in which the second particle detector is located. The second particle detector is moved inside the void or tunnel. The location of the second particle detector in the void / tunnel is determined relative to the first particle detector on the surface in order to generate the map.

The invention discloses an ion optical system for extracting an extremely-low-energy parallel high-current ion beam, which comprises a plasma electrode, an extraction electrode, a suppression electrode, a focusing electrode, a speed reduction electrode I, a speed reduction electrode II and an annular magnet, the plasma electrode, the extraction electrode, the suppression electrode, the focusing electrode, the speed reduction electrode I and the speed reduction electrode II are coaxially mounted in sequence; the annular magnet is positioned between the speed reduction electrode I and the speed reduction electrode II; the plasma electrode is a conical electrode, and a through hole is formed in the center; the extraction electrode is formed by combining a conical electrode and an annular electrode, a through hole is formed in the center of the conical electrode, the conical electrode is located on one side of the plasma electrode, and the annular electrode is located on one side of the suppression electrode; the suppression electrode, the focusing electrode, the deceleration electrode I and the deceleration electrode II are annular electrodes. According to the system, parallel high-current ion beams can be obtained, and a basis can be provided for ground calibration work of a space low-energy particle detector.

A method for monitoring precipitation of magnetospheric particles includes detecting charged magnetospheric particles by a particles detector, processing the detection data to associate a respective estimate or measurement of kinetic energy with the detected magnetospheric particles, obtaining a first count value NH associated with a relatively higher estimate or measurement of kinetic energy, obtaining a second count value NL associated with a relatively lower estimate or measurement of kinetic energy, detecting a relative variation of the second count value NL with respect to the first count value NH, determining that an impulsive event of precipitation of charged magnetospheric particles (MPP event) in the magnetosphere occurred, assigning to the MPP event geomagnetic longitude and time, defining one or more groups of MPP events occurred in a time range at a same geomagnetic longitude, and identifying a group of MPP events indicative of an activity of terrestrial origin.