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64 results about "Pulse rise time" patented technology
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Pulse rise time. The interval of time required for the leading edge of a pulse to rise from 10% to 90% of the peak pulse amplitude.
Optical disk recording method, optical disk device and optical disk
ActiveUS20050058047A1Accurate recordEasy to operateRecording strategiesTelevision system detailsFall timeEngineering
Owner:HITACHI CONSUMER ELECTRONICS CORP
Methods and systems for providing emission of incoherent radiation and uses therefor
InactiveUS6541924B1High outputPower maximizationGas-filled discharge tubesStatic indicating devicesElectrical resistance and conductanceVoltage pulse
Methods and systems for providing emission of incoherent radiation and uses therefor are disclosed. A system for providing emission of high peak power (in watts) incoherent radiation, comprises an electrically impeded discharge lamp linked to an electrical energy supply. The lamp comprises a discharge chamber which is at least partially transparent to the incoherent radiation, a discharge gas in the chamber, two electrodes disposed with respect to the chamber for discharging electrical energy therebetween, at least one dielectric barrier disposed between the two electrodes to electrically impede electrical energy passing between the two electrodes, an electrical energy supply capable of providing fast risetime, high peak power unipolar linking the electrodes with the supply, the energy supply being capable of providing a sequence of high peak power unipolar voltage pulses from the energy supply to the electrodes and means to control (i interpulse period, and (ii) pulse risetime, whereby, in use, a substantially homogeneous discharge occurs between the two electrodes which causes emission of incoherent radiation pulses of high peak power from the lamp.
Owner:MACQUARIE RES
Methods and systems for providing emission of incoherent radiation and uses therefor
InactiveUS20040183461A1High peak power UV outputMaximizes peak powerElectrical apparatusElectric light circuit arrangementElectricityElectrical resistance and conductance
Methods and systems for providing emission of incoherent radiation and uses therefor are disclosed. A system for providing emission of high peak power (in watts) incoherent radiation, comprises an electrically impeded discharge lamp linked to an electrical energy supply. The lamp comprises a discharge chamber which is at least partially transparent to the incoherent radiation, a discharge gas in the chamber, two electrodes disposed with respect to the chamber for discharging electrical energy therebetween, at least one dielectric barrier disposed between the two electrodes to electrically impede electrical energy passing between the two electrodes, an electrical energy supply capable of providing test risetime, high peak power unipolar voltage pulses, means of electrically linking the electrodes with the supply, the energy supply being capable of providing a sequence of high peak power unipolar voltage pulses from the energy supply to the electrodes and means to control (i interpulse period, and (ii) pulse risetime, whereby, in use, a substantially homogeneous discharge occurs between the two electrodes which causes emission of incoherent radiation pulses of high peak power from the lamp.
Owner:MACQUARIE RES
Functional electrical stimulation device and system, and use thereof
ActiveCN103052424AElectric pulse generator circuitsExternal electrodesPeriodic alternatingCapacitance
Disclosed herein is a functional electrical stimulation (FES) device and system. In one embodiment, sequential bipolar pulse stimulation may be provided to an area of a living body via one or more electrode leads applied to the area via a FES device comprising a current pulse generating circuit comprising output nodes for operative coupling to the one or more electrode leads, and configured for operative coupling to a voltage supply. The current pulse generating circuit generally comprises positive and negative stimulation paths drawing from the voltage supply to respectively apply positive and negative currents through the area via the one or more electrode leads. In one example, the stimulation paths comprise respective capacitive elements, a capacitance ratio of which dictating, at least in part, an amplitude ratio of the positive and negative currents, wherein periodic alternative activation of the stimulation paths provides the sequential bipolar pulse stimulation. In another example, each path comprises a respective charging element and a respective activation switch, wherein each respective charging element is charged by the voltage supply and discharged upon activation of the respective activation switch to generate positive and negative current pulses respectively, such that a pulse rise time of the positive and negative current pulses is predominantly dictated by a switching speed of each respective switch. Systems and uses for these devices, and FES in general, are also described.
Owner:UNIV HEALTH NETWORK
Method for processing semiconductor material
InactiveUS6360755B1Inhibited DiffusionReduce erosionPolycrystalline material growthHollow article cleaningShock waveLiquid medium
A method is for processing semiconductor material, in which one or more shock waves generated using a transducer are transmitted through a liquid medium to semiconductor material in rod form. The transducer is at a distance of from 1 cm to 100 cm from the semiconductor material, and the shock waves have a pulse energy of from 1 to 20 kJ and a pulse rise time to the energy maximum of from 1 to 5 mus.
Owner:WACKER CHEM GMBH
Ultrafast edge step pulse generating method and generator thereof
InactiveCN101777891ASmall impedance discontinuity distancePulse shapingAmplitude controlTester device
The invention relates to the technical field of electrical equipment and in particular relates to an ultrafast edge step pulse generating method and a generator thereof. In the invention, a high-precision clock reference source is used for generating a clock excitation signal exciting a high-speed comparator to generate a pulse signal of a faster edge, and a pulse amplitude adjustment circuit is used for amplifying and pre-shaping the amplitude of the pulse signal of the faster edge; then the pulse signal enters a pulse rising edge accelerating circuit, and the rising edge of the pulse signal after amplitude adjustment is further accelerated by utilizing the step recovery effect of a step recovery diode; meanwhile, the waveform of the output pulse signal is subjected to shaping and amplitude control so as to meet the requirements on the rising time, the amplitude and the overshoot pulse of a characteristic impedance tester; and finally, the pulse signal is output by using a pulse output interface. The output pulse rising time is 150ps, the amplitude is larger than 500mV, the overshoot pulse is smaller than 10 percent, and the prepulse can be ignored. The invention can discover or sense smaller impedance discontinuous distances.
Owner:GUANGDONG ZHENGYE TECH +1
10/350 shock current system for air or vacuum crowbar switch
InactiveCN1767335ABig trigger energyGuaranteed reliabilityApparatus without intermediate ac conversionCircuit interrupters testingCapacitanceElectricity
The invention relates to a 10 / 350 impact current system of an air or vacuum CROWBAR switch, which comprises a capacity resistance connected with the power, a main discharging gap, an inductance and a resistance, wherein it coupled with a CROWBAR switch between the main discharging electrode and the capacity discharging circuit of the inductance; the CROWBAR switch comprises an active electrode and a fixed electrode or it fixes fabrics a trigger electrode in the fixed electrode or the discharging gap between the active electrode and the fixed electrode; it electric connects a trigger system between the active electrode and the fixed electrode or between the fixed electrode and the trigger electrode.
Owner:XI AN JIAOTONG UNIV
Composite battery pack
InactiveUS20060250113A1Rapid pulse rise timeLower impedanceBatteries circuit arrangementsElectric powerEngineeringLithium-ion battery
A composite battery set, including a metal-ceramic ruthenium-oxide ultracapacitor and a secondary lithium-ion battery, is provided. The composite battery set is electrically connected to an electrical device, which cuts down the total impedance by the metal-ceramic ruthenium-oxide ultracapacitor to increase the output power and the current. The composite battery set is also able to react a pulse rise time less than 5 ms, to speed up the signal react time of the electronic device. And the composite battery set further includes a protective circuit module (PCM) to protect the secondary lithium-ion battery so as to extend the service life and lifespan.
Owner:APOGEE POWER
Display device
InactiveUS7280093B1Reduce the impactReduce impactStatic indicating devicesNon-linear opticsShift registerDisplay device
An image display device in which a positive clock signal and a negative clock signal of high frequency are made slightly different in a pulse rise time (tr) and a pulse fall time (tf) from each other to reduce the magnitude of noises each having a sharp waveform which noises are generated in a drive circuit (in particular, a shift register circuit) by being superimposed on each other, thereby providing the image display which has the high picture quality and the high definition and which is free from the turbulence of the image. Delay means is provided in a signal producing unit, a control unit, or an input wiring distributed to the associated circuit in order to shift the phases of the positive clock signal and the negative clock signal from each other by the pulse fall time period (tf), thereby reducing the influence exerted on the display.
Owner:SEMICON ENERGY LAB CO LTD
Real-time monitoring device for neutron flux in fission reaction
ActiveCN104464856AHigh measurement accuracyShort glow timeNuclear energy generationMeasurement with scintillation detectorsGamma rayFluorescent light
The invention discloses a real-time monitoring device for the neutron flux in a fission reaction. The device is characterized in that a fast neutron conversion body (1), a fluorescent light reflection tube (3), a boron plastic flash body (2), a Cherenkov light reflection tube (5) and a Cherenkov radiation body (4) are arranged in the incident direction of particles in sequence; neutrons and gamma rays enter the boron plastic flash body (2) to interact with substances to generate e+ / e-, recoil protons and alpha particles, the e+ / e-, the recoil protons and the alpha particles are excited to generate fluorescent light, and the fluorescent light enters a first photoelectric multiplier tube (7) through reflection of the fluorescent light reflection tube (3) and is amplified through an amplifier (10) to obtain neutron and gamma information; after secondary particles enter the Cherenkov radiation body, only e+ / e- generates Cherenkov light, and the Cherenkov light is amplified through a second photoelectric multiplier tube to obtain gamma information; two signals are subjected to subtraction to obtain neutron flux information. According to the device, the n and gamma signals are judged in combination with the pulse rise time difference, so that the measurement precision of the pulsed neutron flux is further improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Phase angle detection apparatus and variable valve timing control apparatus using the phase angle detection apparatus for internal combustion engine
InactiveUS20070295295A1Improve accuracyValve arrangementsMachines/enginesVariable valve timingInternal combustion engine
A phase angle detection apparatus includes an intermediate rotary member changing an operating angle of a driven member that is driven by a driving member, a detection unit detecting a rotational angle of the intermediate rotary member, which corresponds to the operating angle of the driven member, and outputting the rotational angle as a detection pulse signal, a controller receiving the detection pulse signal and calculating a pulse rising time difference between the detection pulse signal and a pre-set reference pulse signal. The controller detects, based on the pulse rising time difference, a predetermined middle angle position of the driven member from all the operating angles of the driven member.
Owner:HITACHI LTD
Multi-pulse high-voltage triggering device of rotary switch
The invention discloses a multi-pulse high-voltage triggering device of a rotary switch, and relates to the field of high-voltage pulse power sources. The problems that a rotary switch is triggered through a single high-voltage pulse in the prior art, the triggering voltage pulse rise time is long, and triggering is not reliable are solved. The multi-pulse high-voltage triggering device is composed of a grid electricity rectifying filtering circuit, a pulse signal source, a pulse control circuit, a semiconductor switch drive circuit, a high-power semiconductor switch, a semiconductor switch protection circuit, an energy storing capacitor, a high-voltage pulse transformer, an output detection feedback circuit and a PID regulation control circuit, wherein the grid electricity rectifying filtering circuit is electrically connected with a power supply, the pulse control circuit is electrically connected with the pulse signal source, the semiconductor switch drive circuit is electrically connected with the pulse control circuit, the high-power semiconductor switch is electrically connected with semiconductor switch drive circuit, the semiconductor switch protection circuit is electrically connected with the high-power semiconductor switch, the energy storing capacitor is respectively and electrically connected with the grid electricity rectifying filtering circuit and the high-power semiconductor switch, the high-voltage pulse transformer is electrically connected with the energy storing capacitor, the output detection feedback circuit is electrically connected with the high-voltage pulse transformer, and the PID regulation control circuit is electrically connected with the output detection feedback circuit. According to the multi-pulse high-voltage triggering device, the triggering pulse rise time is smaller than 10 microseconds, and triggering is reliable and stable.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
0-150 V wide-range remote control synchronous pulse generator
InactiveCN104468073AWith status lock functionAvoid misuseElectric pulse generatorSynchronisation signal speed/phase controlMOSFETElectromagnetic environment
A 0-150 V wide-range remote control synchronous pulse generator consists of a pulse control end, a pulse generating end and a connecting optical fiber and mainly comprises an outer trigger circuit (1), a manual trigger circuit (2), a reset circuit (3), an or-gate circuit (4), a state locking circuit (5), a mode switching module (6), an electro-optical conversion module (7), a single mode fiber (8), a photovoltaic conversion module (9), a 0-150 V adjustable power supply circuit (10) and a pulse generating output circuit (11). The problem that a synchronous control pulse signal cannot effectively trigger level compatibility between a far-end device and different devices under the electromagnetic interference is solved, and the 0-150 V wide-range remote control synchronous pulse generator can be used for triggering of long-distance devices in a strong electromagnetic environment. The scheme involved by the 0-150 V wide-range remote control synchronous pulse generator is achieved mainly by adopting a logic IC, a photovoltaic conversion device, a high-speed MOSFET field effect switch tube and a transmission optical fiber, and when optical fiber transmission time is not calculated, the overall delay of the synchronous pulse generator is smaller than 290 ns from trigger signal input to synchronous pulse signal output, output pulse rising time is about 21 ns, and maximum delay of four pulse outputs is smaller than 500 ps.
Owner:SOUTHWEAT UNIV OF SCI & TECH
Control system and method of bipolar high voltage pulse power supply
ActiveCN108322198ASafe and reliable workMeet needsMultiple input and output pulse circuitsFall timeControl system
The invention discloses a control system and method of a bipolar high voltage pulse power supply. A switching sequence in a solid switch group module through control modules in a high voltage positivepulse generating circuit and a high voltage negative pulse generating circuit to obtain the bipolar high voltage pulse power supply in which a positive / negative pulse rising time, a positive / negative pulse falling time, a time interval between positive and negative pulses within one period, a positive / negative pulse voltage, a positive / negative pulse width, pulse frequency and a pulse number can be flexibly adjusted. The parameter-adjustable bipolar pulse realized by the control system and method disclosed by the invention has very important significance for studying the mechanism and the application of nanosecond pulse discharge.
Owner:XI AN JIAOTONG UNIV +1
Pulse-shape discrimination of neutrons using drift tubes
InactiveUS20140158895A1Accurate measurementElectric discharge tubesMaterial analysis by optical meansElectrical impulseDrift tube
Apparatus and method for separating neutron-induced 4He (or other nuclei) recoil from background, which is predominantly gamma-ray induced electrons and cosmic rays, using software analysis of digitized electrical pulses generated in a six tube, high-pressure (11 bar) helium-4 (4He) detector, are described. Individual electrical pulses from the detector were recorded using a 12-bit digitizer, and differences in pulse rise time and amplitudes, due to different energy loss of neutrons and gamma rays, are used for neutron / gamma ray separation.
Owner:LOS ALAMOS NATIONAL SECURITY
System for detecting single-particle transient current pulse
The invention provides a system for detecting a single-particle transient current pulse, which includes an irradiation device used for irradiating a to-be-measured area of a device, and an oscilloscope used for capturing signals of single-particle pulse current. Through adopting the method and the equipment provided by the invention, the pulse shape of original single-particle transient current can be captured, the pulse rise time, pulse width, pulse amplitude and other parameters of the single-particle current can be measured visually, further, the node state of a characterization circuit can be analyzed through the single-particle transient current pulse, and the width distribution of the single-particle current pulse in a specific circuit can be obtained, so that the reinforcement reference of the circuit for single-particle radioresistance can be obtained.
Owner:INST OF MICROELECTRONICS CHINESE ACAD OF SCI
Ultra-high voltage pulse transformer
ActiveCN105489356AFix damageSolve assembly problemsTransformers/inductances coolingTransformers/inductances coils/windings/connectionsCapacitanceUltra high voltage
The invention discloses an ultra-high voltage pulse transformer, which comprises a transformer component and an oil cylinder, wherein the transformer component is connected with the oil cylinder in a rapid connecting manner of a socket and a plug; the transformer component comprises a main transformer, a bias inductor, a capacitive voltage divider, a current transformer and an equipotential capacitor, which all are arranged on a semicircular bottom plate to be conveniently and quickly installed and maintained; the main transformer is formed by combining multiple groups of iron cores which are rectangular cutting iron cores in parallel; and corners of all iron cores are rounded. According to the ultra-high voltage pulse transformer, multiple problems that a traditional ultra-high voltage pulse transformer is huge in volume, heavy, not beautiful in appearance, complicated in structure, difficult to produce, assemble and maintain, too long in pulse rising time and the like, and the problem that surroundings and operators are harmed due to the fact that the radiation dose of dangerous rays exceeds the standard in online charging work are solved; the production cost is reduced; and the production efficiency is improved.
Owner:GLORYMV ELECTRONICS
Interconnected line failure detection method
InactiveCN101769975ASimple methodThe detection process is fastSemiconductor/solid-state device testing/measurementFault location by pulse reflection methodsTime domainTime-domain reflectometer
The invention discloses an interconnected line failure detection method, which comprises the following steps: connecting a first pulse generator to an excitation point of a first electrode of an interconnected line; connecting a time-domain reflectometer to a test point; connecting a second pulse generator to a second electrode; inputting a voltage pulse to the excitation point by using the first pulse generator, wherein the raising time of the pulse is 2 times less than the time for inputting the voltage pulse from the excitation point in the interconnected line to receiving the voltage pulse by the second electrode; and determining the position of failure points according to the reflecting time if the reflected voltage pulse is received by the time-domain reflectometer of the test point. The invention improves the speed and the efficiency of the detection and the accuracy of the positioning.
Owner:SEMICON MFG INT (SHANGHAI) CORP
Method and Apparatus for Nerve and Muscle Stimulation and Pain Treatment
InactiveUS20110178571A1Robust muscle stimulationGood pain reliefElectrotherapyArtificial respirationPulse sequenceMuscle Stimulation
An apparatus for transcutaneous stimulation comprising: a pulse generator operative to generate repetitive pulses exhibiting a pulse width of 25-60 microseconds, a consistent pulse rise time of no more than 5% of the pulse width and an inter-pulse interval of between 0.1 and 3 milliseconds; an intra-group modulator producing modulated pulses exhibiting an amplitude of between 50% and 100% of a maximum modulated pulse amplitude in a generally increasing manner, the modulated pulses defining a group of pulses, the intra-group modulator being further operative to modulate the pulses to exhibit an amplitude of no more than 25% of the maximum modulated pulse amplitude for a predetermined time period between successive groups of pulses thereby creating a pulse train; and an output modulator modulating the pulse train to produce output pulses exhibiting an amplitude of between 50% and 100% of a maximum according to a predetermined repetitive waveform.
Owner:PAINLESS
67GHz coaxial broadband peak power probe
The invention provides a 67GHz coaxial broadband peak power probe. The 67GHz coaxial broadband peak power probe comprises a detecting circuit and a post-detection video processing circuit, wherein the detecting circuit is composed of a 1.85mm coaxial connector, a round gold foil, a corrugated pipe, a 3dB attenuator, a 50 ohm matching network, at least two resonance controlling resistors, at least two low barrier schottky diodes, at least two video filter capacitors and at least one positive coefficient thermistor, and the detecting circuit is used for filtering out carrier waves of pulse modulation signals to obtain envelope signals of the pulse modulation signals. By means of the scheme, achieved typical indexes include that carrier signal frequency range is 500MHz to 67GHz; the peak power dynamic range is (-20) dBm to 20dBm; the pulse rise time is <= 5ns; the input port standing-wave ratio is smaller than 1.6: 1, the post-detection video bandwidth is large, <= 5ns pulse rise / fall time can be measured, and the measurement of <= 5ns pulse rise / fall time is better than that of < 15ns pulse rise / fall time.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD
Comprehensive diode forward recovery parameter test and analysis platform
ActiveCN104155590AImprove performanceLabor savingIndividual semiconductor device testingCapacitanceHemt circuits
The invention discloses a comprehensive diode forward recovery parameter test and analysis platform which is characterized by comprising the following units: a pulse generator, a pulse current amplitude adjusting circuit, a pulse edge accelerating circuit, a pulse rise time processing circuit, a pulse rise time signal pulse width-voltage conversion circuit, a tested diode, a forward recovery voltage test and peak detection circuit, a forward recovery time processing circuit, a forward recovery time signal pulse width-voltage conversion circuit, an A / D conversion circuit, a central processor, and a display. A transistor with high feature frequency, low junction capacitance and small leakage current is chosen as a signal processing unit as much as possible, and the transistor is set and adjusted to a non-saturated work state, which can effectively avoid the charge storage effect, and is conducive to bandwidth maintaining and conduction velocity improving. The platform of the invention can be used for measuring and evaluating parameters of power diodes, switching diodes and IGBTs such as forward recovery waveform, forward recovery time and forward recovery voltage peak, and can contribute to the development of high-performance electrical systems.
Owner:徐州振丰原喷灌设备有限公司
Method for reducing damage of substrate material by high-energy particle bombardment
ActiveCN105070627AAvoid damageControl securityElectric discharge tubesSemiconductor/solid-state device manufacturingRadio frequencyPlasma etching
The invention provides a method for reducing damage of a substrate material by high-energy particle bombardment, wherein the method belongs to the field of plasma etching. The method comprises the steps of presetting a pulse modulation signal, wherein a pulse rising time t is shorter than D*T(D is the duty cycle of the pulse, and T is the period of the pulse); and then performing pulse modulation on a substrate bias RF power source through utilizing the pulse modulation signal as a modulation signal, thereby obtaining an RF modulation power with a rising edge t. Compared with the prior art, the method has advantages of reducing damage of a pulse modulation substrate material caused by high-energy particle bombardment at the early period of an offset voltage, ensuring high safety of the substrate material in an etching process, and realizing better performance of the etching device. Furthermore, according to different bias parameters required in etching, an appropriate t value can be selected so that the t value satisfies a requirement for etching various substrate materials. Furthermore the method can be combined with the discharging mode of different coil RF power sources, so that the method is adapted to different plasma discharging conditions.
Owner:DALIAN UNIV OF TECH
Functional electrical stimulation devices and systems and uses thereof
ActiveCN103052424BElectric pulse generator circuitsExternal electrodesPeriodic alternatingCapacitance
Owner:UNIV HEALTH NETWORK
Pulse generation device used for flue gas purification
ActiveCN107081046AShorten the lengthReduce inductanceGas treatmentDispersed particle separationFlue gasEngineering
The invention provides a pulse generation device used for flue gas purification. According to the device, on the one hand, the technical scheme that a pulse power supply insulator and a discharge electrode insulator are arranged on a traditional pulse generation device respectively is improved, one insulator is directly used for making a pulse power supply and a discharge electrode connected, so that the cable length and the loop inductance are reduced, the pulse rising time is shortened, and the plasma generation efficiency in each unit of electric energy is improved; on the other hand, by using a series high-voltage switch set, the voltage of primary pulses is increased, so that the ratio of transformation of a pulse transformer is reduced, and the efficiency of the pulse transformer is improved. When the device is used for the flue gas purification, the flue gas purification efficiency can be improved on the basis of reducing energy consumption, and environmental requirements are met. The experimental results show that when the pulse generation device is used for the flue gas purification, the emission concentrations of flue gas pollutants can be reduced, that is the emission concentration of SO2 is reduced to 35 mg / m<3>, the emission concentration of NOx is reduced to 50 mg / m<3>, and the emission concentration of dust is reduced to 5 mg / m<3>. Besides, compared with the traditional pulse generation device, the power consumption is reduced to 38 KV from 50 KW, and the energy is saved by 24%.
Owner:HANGZHOU TEAMS ENVIRONMENTAL PROTECTION ENG
Scintillation pulse model-simplifying, reconstruction and energy-obtaining methods
ActiveCN106443760AReduce Rebuild ComplexityImprove rebuild speedRadiation intensity measurementReduced modelImage resolution
The invention discloses a simplified scintillation pulse model establishment method. The method comprises the following steps that an original scintillation pulse model Y'(t)=a*e<-(t-t0)*b>*[1-e<-(t-t0)*d>] is used in the reconstruction process of scintillation pulse signals obtained by practical sampling; for scintillation pulses of different energies, it is defined that a practical start moment t0 of the scintillation pulse, a pulse rise time related parameter b and a pulse fall time related parameter d are not changed and that only the pulse amplitude changes; and during scintillation pulse reconstruction, a moment of a pulse sampling value is used as the moment 0, and a simplified scintillation pulse model is y(t)=a*e<-(t-t'0)*b0>*[1-e<-(t-t'0)*d0>], wherein t'0, b0 and d0 represents empirical values of t0, b and d in the original scintillation pulse model respectively. The invention also discloses a scintillation pulse reconstruction method and a rapid energy information obtaining method on the basis of the simplified model. According to the methods, the complexity of reconstruction of the scintillation pulses can be reduced effectively, scintillation pulse reconstruction and energy information obtaining can be accelerated, and adverse influence on the system energy resolution is reduced as possible.
Owner:RAYSOLUTION DIGITAL MEDICAL IMAGING CO LTD
Long-lifetime neutron tube with ceramic-head ion source
InactiveCN105744714ASmall diameterHigh dielectric strengthDirect voltage acceleratorsPulse characteristicsMetal electrodes
The invention belongs to the technical field of a neutron source, in particular to a miniature long-lifetime neutron tube which can be switched off. In the long-lifetime neutron tube, a copper head is substituted by a ceramic head, an ion source cathode and a metal electrode are welded on the ceramic head, and a positive electrode cylinder is welded on the metal electrode, so that a ceramic-head ion source for the neutron tube is assembled. An ion source ceramic insulation ring is arranged for filling between the positive electrode cylinder and an ion source cover, an acceleration gap ceramic insulation ring is arranged for filling between the ion source cover and an acceleration cylinder, the insulation strength is improved, the sealing difficulty is reduced, and the coaxiality is ensured; discharge and breakdown probability is substantially reduced, the miniaturization of the neutron tube is promoted, the yield, the stability and the pulse characteristic of the neutron tube are improved, the service lifetime of the neutron tube is prolonged, the finished rate is greatly improved, the technological parameters of the neutron tube are high in consistency, the neutron tube is long in service life, and industrial condition is possessed; and the service lifetime of the neutron tube after improved is prolonged by 2-3 times, the yield is improved by around 3 times, the stability is improved by not more than 2%, the pulse rising time is smaller than 2.5 microseconds, the pulse failing time is smaller than 0.5 microsecond, and the finished rate is higher 90%.
Owner:NORTHEAST NORMAL UNIVERSITY
Power-frequency synchronization depth storage ns-grade pulse multi-parameter generation system
InactiveCN105281715AGuaranteed accuracyEasy to operateElectric pulse generator circuitsElectric digital data processingNumerical controlElectricity
The invention provides a power-frequency synchronization depth storage ns-grade pulse multi-parameter generation system, comprising a computer, a waveform storage module in electric connection with the computer, a numerical-control pulse signal generation module and a power-frequency synchronization trigger module, wherein the numerical-control pulse signal generation module and the power-frequency synchronization trigger module are electrically connected with the waveform storage module, and the power-frequency synchronization trigger module is electrically connected with the numerical-control pulse signal generation module. By means of the power-frequency synchronization depth storage ns-grade pulse multi-parameter generation system of the invention, pulse amplitude, pulse rising time, pulse fall time, pulse polarity, the number of pulses, pulse repetition frequency and pulse trigger phase are set via the computer, and the power-frequency synchronization trigger module is further controlled to trigger the numerical-control pulse signal generation module at the set phase, thereby realizing power-frequency synchronization, standard pulse generation, low cost and high convenience and efficiency. The precision of signal output is guaranteed, complicated control-panel operation is avoided, and the problem of the prior art of single function is solved.
Owner:YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Method of sterilizing liquid and liquid food
InactiveCN101496626ASuppress flavorInhibit deteriorationFood scienceElectrical field strengthEngineering
A method of sterilizing a liquid food material which comprises applying a high electric filed pulse, wherein the pulse width is regulated to less than 200 ns, the pulse rising time is regulated to 50 ns or less and the electric field strength is controlled to 10 to 200 kV / cm, to the liquid food material and thus heating the liquid food material at least to 100 DEG C.
Owner:SUNTORY HLDG LTD
Calibration method of pulse current
InactiveCN103116081APulse characteristics measurementsElectrical resistance and conductanceWave shape
The invention discloses calibration method of pulse currents. The calibration method includes following steps: the pulse currents output by a pulse current source (1) pass through an attenuator (2), an oscilloscope (3), the ground and a matched resistor (4) to form a closed current circuit; by the attenuator (2), input voltage of the oscilloscope (3) is attenuated; and characteristic parameters of the pulse currents are obtained by the corresponding relation between a wave shape displayed by the oscilloscope (3) and the pulse currents. The corresponding relation between the wave shape displayed by the oscilloscope (3) and the pulse current can be adjusted by adjustment of the attenuation ratio of the attenuator (2). The calibration method can calibrate the pulse currents generated by the pulse current source, and the characteristic parameters of pulse height, pulse rise time, pulse fall time, pulse width and the like of the pulse current are obtained.
Owner:BEIJING INST OF RADIO METROLOGY & MEASUREMENT
Method for operating a light-emitting device and arrangement
Owner:NOVALED GMBH
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