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253 results about "Electrometer" patented technology
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An electrometer is an electrical instrument for measuring electric charge or electrical potential difference. There are many different types, ranging from historical handmade mechanical instruments to high-precision electronic devices. Modern electrometers based on vacuum tube or solid-state technology can be used to make voltage and charge measurements with very low leakage currents, down to 1 femtoampere. A simpler but related instrument, the electroscope, works on similar principles but only indicates the relative magnitudes of voltages or charges.
Sample electrification measurement method and charged particle beam apparatus
InactiveUS6946656B2Reduce errorsReduce fluctuationMaterial analysis using wave/particle radiationElectric discharge tubesMagnificationElectrometer
Owner:HITACHI LTD
Instruments for measuring nanoparticle exposure
ActiveUS20060284077A1Material analysis using wave/particle radiationParticle separator tubesElectrical mobilityElectrically conductive
An instrument for non-invasively measuring nanoparticle exposure includes a corona discharge element generating ions to effect unipolar diffusion charging of an aerosol, followed by an ion trap for removing excess ions and a portion of the charged particles with electrical mobilities above a threshold. Downstream, an electrically conductive HEPA filter or other collecting element accumulates the charged particles and provides the resultant current to an electrometer amplifier. The instrument is tunable to alter the electrometer amplifier output toward closer correspondence with a selected function describing particle behavior, e.g. nanoparticle deposition in a selected region of the respiratory system. Tuning entails adjusting voltages applied to one or more of the ion trap, the corona discharge element and the collecting element. Alternatively, tuning involves adjusting the aerosol flow rate, either directly or in comparison to the flow rate of a gas conducting the ions toward merger with the aerosol.
Owner:TSI INC
Non-contact high-voltage electrometer architecture with low-voltage feedback
ActiveUS7098644B1Reduction in electrometer costMaintain accuracyResistance/reactance/impedenceElectrical testingTarget surfaceContact high
A voltmeter measures an unknown voltage on a target surface using multiple sampling stages or a parallel reference capacitor. A movable shutter may alternately be closed during resetting of a voltage measuring circuit and opened so as to expose a detector plate to the target surface during two sampling stages. Alternatively, the shutter may be used to modulate exposure of a detector plate to the target surface.
Owner:ANALOG DEVICES INC
Radiation detection apparatus
InactiveUS20050056791A1Lower potentialGreat cable flexibilityMicrobiological testing/measurementSolid-state devicesShielded cableElectrical conductor
A radiation detection system has a linear array of radiation detectors, which are preferably ionization chambers. The detectors are connected, preferably permanently, to a multi-channel signal processor through a flexible multi-conductor shielded cable. The multi-channel signal processor is connected to a controller, such as a personal computer, through a multi-conductor cable and a communication interface device. Multiple detector arrays and multi-channel electrometers may be connected to a single personal computer and used simultaneously.
Owner:STANDARD IMAGING
Quantum bit with a multi-terminal junction and loop with a phase shift
A solid-state quantum computing qubit includes a multi-terminal junction coupled to a superconducting loop where the superconducting loop introduces a phase shift to the superconducting order parameter. The ground state of the supercurrent in the superconducting loop and multi-terminal junction is doubly degenerate, with two supercurrent ground states having distinct magnetic moments. These quantum states of the supercurrents in the superconducting loop create qubits for quantum computing. The quantum states can be initialized by applying transport currents to the external leads. Arbitrary single qubit operations may be performed by varying the transport current and / or an externally applied magnetic field. Read-out may be performed using direct measurement of the magnetic moment of the qubit state, or alternatively, radio-frequency single electron transistor electrometers can be used as read-out devices when determining a result of the quantum computing. Further, qubits as described above can form arrays of qubits for performing controlled quantum computing calculations. In one example, an array of qubits can be utilized as a random number generator.
Owner:D WAVE SYSTEMS INC
System for automatically measuring charge distribution on surface of solid medium
The invention belongs to the testing field of discharge characteristics of solid insulating materials, relating to a system for automatically measuring charge distribution on the surface of a solid medium. The system comprises a stainless steel sealed chamber body, a high-voltage electrode, a grounding electrode, an electrostatic meter, a vacuum pump and a computer system thereof, wherein the stainless steel sealed chamber body is provided with a one-dimensional worktable and a two-dimensional worktable; a sample under test is fixed on the two-dimensional worktable; a electrostatic capacitanceprobe is arranged on the one-dimensional worktable; the electrostatic capacitance probe and the one-dimensional worktable are arranged in an extended chamber body of the stainless steel sealed chamber body towards the sample under test on the two-dimensional worktable; one end of the sample under test is connected with the high-voltage electrode, while the other end thereof is connected with thegrounding electrode; the one-dimensional worktable and the two-dimensional worktable are connected to an electronic control displacement table control box by a control line; the electrostatic capacitance probe is connected with the electrostatic meter; and the electronic control displacement table control box and the electrostatic meter are accessed to the computer. In the invention, the system for automatically measuring charge distribution on the surface of the solid medium can measure two-dimensional distribution of charge density on the surface of insulating materials.
Owner:XI AN JIAOTONG UNIV +1
Quantum bit with a multi-terminal junction and loop with a phase shift
A solid-state quantum computing qubit includes a multi-terminal junction coupled to a superconducting loop where the superconducting loop introduces a phase shift to the superconducting order parameter. The ground state of the supercurrent in the superconducting loop and multi-terminal junction is doubly degenerate, with two supercurrent ground states having distinct magnetic moments. These quantum states of the supercurrents in the superconducting loop create qubits for quantum computing. The quantum states can be initialized by applying transport currents to the external leads. Arbitrary single qubit operations may be performed by varying the transport current and / or an externally applied magnetic field. Read-out may be performed using direct measurement of the magnetic moment of the qubit state, or alternatively, radio-frequency single electron transistor electrometers can be used as read-out devices when determining a result of the quantum computing. Further, qubits as described above can form arrays of qubits for performing controlled quantum computing calculations. In one example, an array of qubits can be utilized as a random number generator.
Owner:D WAVE SYSTEMS INC
Device for measuring dynamic change of friction static electricity and friction property of insulating material
InactiveCN102944764AWide range of optionsWide measurement rangeThermometers using electric/magnetic elementsUsing electrical meansCapacitanceEngineering
The invention discloses a device for measuring dynamic change of friction static electricity and friction property of an insulating material. An electrostatic potential sensing head (1) of a vibration capacitance type electrometer (4) is horizontally placed on a friction abrasion test machine (27) which rotates horizontally, so as to monitor the dynamic change of the friction electrostatic potential of a working surface of a sample (18) to be tested, and lay a signal into a computer; a friction sensor (12) is connected in the tangential direction of a loading sleeve rod (11), and is used for inputting an obtained friction signal of the sample (18) to be tested into the computer through a friction transmission line (13); the temperature change of the working surface of the sample (18) to be tested can be monitored; a glass sealing shade (37) is installed on a base disc (35) through a sealing groove (36); and the sealing groove (36) ensures that the good air tightness between the glass shade (37) and the base disc (35) is achieved. A test platform for accurate measurement is provided for revealing the principle of electrification by friction and analyzing the influencing factor of the friction electrostatic potential of the insulating material.
Owner:SICHUAN AGRI UNIV +1
Micro-mechanical resonant electrometer with ultra-high sensitivity
ActiveCN106645999AHigh sensitivityReduce the amplitudeElectrical measurementsBand-pass filterClosed loop
The invention, which belongs to the MEMS field, discloses a micro-mechanical resonant electrometer with ultra-high sensitivity. The method comprises a mechanical structure design method of an electrometer header and a testing circuit design method. Compared with the prior art using a movable resonator charge input polar plate, the mechanical structure design enables the conversion efficiency between the electrostatic force and the axial stress to be improved; and with a micro-mechanical lever, the electrostatic force increases to improve mechanical sensitivity. When an external charge is inputted, rigidity disturbance on a resonator I increases and thus the localization phenomenon of the mode becomes dramatic. Meanwhile, the two provided resonators with different structures employ differential detection structures; the differential amplification circuit is used for detecting the amplitudes of the resonators and eliminating feed-through signals, so that the signal to noise ratio of the detection signal can be improved. In terms of the testing circuit design, a closed-loop testing plane is employed. To be specific, a signal at a detection electrode passes through a trans-impedance amplifier, a subtracter, a band-pass filter and a comparator and then is loaded at an alternating-current drive electrode to form a closed loop; rectification and filtering are carried out on two paths of outputs of the subtracter and dividing is carried out to obtain a direct-current voltage signal reflecting an amplitude ratio of two resonators. With a closed-loop drive detection circuit, the amplitude and frequency noise of the resonator can be reduced.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Test unit for monitoring oil-paper insulation state
The invention provides a test unit for monitoring an oil-paper insulation state, and is suitable for the fields of transformers and oil-paper insulation monitoring. The test unit comprises a computer, an electrometer and a control bus communication cable; a high voltage DC power source and an ammeter are arranged in the electrometer; one end of the control bus communication cable is connected with a control bus interface of the electrometer, while the other end is connected with an interface of a control bus control card in the computer; a low voltage end interface of the high voltage DC power source and a grounding interface of the electrometer are grounded together; a high voltage end of the high voltage DC power source is connected with a first electrode of a product to be tested through a high voltage wire; a measuring end of the ammeter is connected with a second electrode of the product to be tested; and the test unit is provided with a control panel capable of displaying and storing data and setting parameters. The test unit is simple to operate, has the current detecting rate at least 1sps, can generate rich measurement information, is convenient to analyze and process test results, and has lower cost than foreign test instruments.
Owner:XI AN JIAOTONG UNIV +1
Portable reactivity meter for carrying out full measuring range automatic monitoring on reactor signal, and reactivity correction method
ActiveCN104376884AFlexible handlingEasy to carryNuclear energy generationNuclear monitoringRead throughEngineering
The present invention provides a portable reactivity meter for carrying out full measuring range automatic monitoring on the reactor signal, and a reactivity correction method. According to the present invention, the reactor signal input portion supports USB data communication, is connected with a computer through USB, and can flexibly support online measurement and offline treatment on the reactivity; the portable reactivity meter is provided with a high-precision micro-current measurement unit, the neutron detector current value is read through an industrial-grade high-precision electrometer, the bus communication circuit is matched to form the micro-current measurement channel of the reactivity meter, and the current mature micro-current measurement technology is integrated into the reactivity meter so as to produce the intrinsic improvement effect on the precision and the stability of the reactivity meter; and with the system adopting the image value to recognize the non-intrusive read nuclear instrument display value, the disadvantages of the hardware intervention, time-saving and easy mistake during human reading in the previous nuclear instrument data acquiring way are overcome, and the nuclear instrument display value can be recognized as the data only requiring the camera so as to achieve the real-time collection and sharing of the important data.
Owner:CHINA INSTITUTE OF ATOMIC ENERGY
Device and method for measuring deep dielectric charging characteristic parameter of spacecraft dielectric material
InactiveCN103454315AApplicable assessmentEasy to measureResistance/reactance/impedenceMaterial impedanceDielectricDose rate
The invention provides a device and a method for measuring deep dielectric charging characteristic parameter of a spacecraft dielectric material. The device comprises a radiation source, a vacuum unit, a sample target table, a control unit, an electrostatic potentiometer, an electrometer, a total conductivity acquisition unit, a potential attenuation measurement unit, a first processing unit and a second processing unit, wherein the electrostatic potentiometer is used for measuring the surface potential of a sample medium under certain flux; the electrometer is used for measuring the leakage current of the sample under certain flux; the total conductivity acquisition unit is used for acquiring the total conductivity based on the measured surface potential and the leakage current; the first processing unit is used for obtaining dark conductivity values under all fluxes based on the obtained potential attenuation curve along with the passage of time and a charge storage attenuation method, and taking an average to obtain the dark conductivity Sigma O; the second processing unit is used for obtaining radiation induction conductivity corresponding to the dosage rate generated in material volume under two different kinds of beam intensity based on the obtained dark conductivity and the total conductivity, so as to obtain the related parameters Kp and the dimensionless exponent delta value of the sample material.
Owner:NAT SPACE SCI CENT CAS
Spin readout and initialization in semiconductor quantum dots
ActiveUS20050184285A1Quick initializationEliminate needNanoinformaticsSemiconductor devicesSingle electronSpins
A semiconductor quantum dot device converts spin information to charge information utilizing an elongated quantum dot having an asymmetric confining potential along its length so that charge movement occurs during orbital excitation. A single electron sensitive electrometer is utilized to detect the charge movement. Initialization and readout can be carried out rapidly utilizing RF fields at appropriate frequencies.
Owner:WISCONSIN ALUMNI RES FOUND
Reduction of banding and mottle in electrophotographic systems
A mechanism and process for detecting mottle or banding in a developed electrophotographic image. Within an electrophotographic reproduction apparatus 10, a photoconductor is used for receiving and developing a latent image. The photoconductor traverses a path that passes a charging station 28, an exposure station 34, a toning station 38, and a transfer station 46. Either a densitometer 76 for measuring the density of the developed image on the photoconductor, or an electrometer 50a or 50b for detecting the voltage of the image on the photoconductor, detects mottle or banding on the developed image. The densitometer 76 or electrometer 50a or 50b has an aperture small enough to detect mottle or banding with wavelengths perceptible by human eyes. A logic and control unit 24 averages the image density or voltage measurements, calculates the variations of the measurements about the average and the periodicities of the measurements, and if the variations or periodicities indicate mottle or banding is present, changes the operation of one or more stations to reduce mottle or banding.
Owner:EASTMAN KODAK CO +1
Detection device and detection method for number concentration of fine particulate matter in motor vehicle exhaust gas
ActiveCN105424570ASimple structureEasy to operateParticle suspension analysisMeasurement deviceFast measurement
The invention relates to a detection device and a detection method for number concentration of fine particulate matters in motor vehicle exhaust gas. The detection device includes: an air source, a jet pump, a filtering drier, an ion source module, a charging zone, a jet throat part, a capture voltage module, a tail gas exhaust tube, a cyclone PM2.5 cutter, and an electrometer. The detection device and the detection method can solve the defects in the prior art, and can achieve quick measurement on the number concentration of fine particulate matters in the motor vehicle exhaust gas even without pre-treatment on the motor vehicle exhaust gas.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Field gas chromatograph with flame ionization
ActiveUS20110192214A1Accurate analysisHigh precision and repeatabilityComponent separationMaterial analysis by electric/magnetic meansDischarge ionization detectorHelium ionization detector
The invention relates to a field gas chromatograph with flame ionization for the analysis of a gaseous mixture of hydrocarbons, extracted, in particular, from oil drilling mud. Said mixture consists of a fraction of heavy hydrocarbons (beyond pentane) dissolved in mud in gaseous form. Said field gas chromatograph is made up of two independent analysis circuits, dephased by half a cycle and synchronised one with the other. Said analysis circuits are comprised of at least one sampling cell in a preferred design layout, at least one capillary separation chromatography column, at least one flame ionization detector, and at least one electrometer for the conversion of an electrical current, collected by the flame ionization detector, into a voltage signal describing a chromatogram.
Owner:GEOLOG
Integrating electrometer amplifying circuit
ActiveUS20050162173A1Prevent excess chargingEasy to trackCurrent/voltage measurementIndividual particle analysisElectrometerHigh pressure
An aerosol particle spectrometer utilizes a high voltage central electrode and a series of annular, axially arranged collector electrodes maintained at ground, for collecting positively charged particles suspended in an aerosol flowing between the electrodes. Each collector electrode provides current to an integrating electrometer including circuitry that rapidly charges and discharges the integrating capacitor during a brief reset cycle, to generate accurate particle characterizing information based on low currents, with high bandwidth and high dynamic range, virtually in real time.
Owner:MIRME AADU
Blown sand and quick sand charge-to-mass ratio real-time measurement system
ActiveCN102323493AReal-time measurementReal-time acquisitionElectrical measurementsMass ratioElectrometer
The invention discloses a blown sand and quick sand charge-to-mass ratio real-time measurement system which comprises a sand particle bearing device, a sand particle weighing device and a sand particle electrified capacity measuring device, wherein the sand particle bearing device is a Faraday cup, the sand particle weighing device is an electronic balance, and the sand particle electrified capacity measuring device is an electrometer; and the Faraday cup is arranged on the electronic balance and connected with the electrometer through a lead. By the matching of the devices, the invention can realize real-time acquisition of sand particle mass and electrified capacity in the Faraday, and can also realize high-frequency measurement of a blown sand and quick sand charge-to-mass ratio.
Owner:LANZHOU UNIVERSITY
Quantum bit with a multi-terminal junction and loop with a phase shift
InactiveUS20020117738A1Lower energy barrierQuantum computersNanoinformaticsElectrometerNumber generator
A solid-state quantum computing qubit includes a multi-terminal junction coupled to a superconducting loop where the superconducting loop introduces a phase shift to the superconducting order parameter. The ground state of the supercurrent in the superconducting loop and multi-terminal junction is doubly degenerate, with two supercurrent ground states having distinct magnetic moments. These quantum states of the supercurrents in the superconducting loop create qubits for quantum computing. The quantum states can be initialized by applying transport currents to the external leads. Arbitrary single qubit operations may be performed by varying the transport current and / or an externally applied magnetic field. Read-out may be performed using direct measurement of the magnetic moment of the qubit state, or alternatively, radio-frequency single electron transistor electrometers can be used as read-out devices when determining a result of the quantum computing. Further, qubits as described above can form arrays of qubits for performing controlled quantum computing calculations. In one example, an array of qubits can be utilized as a random number generator.
Owner:D WAVE SYSTEMS INC
Charge neutralizer for glass substrate
InactiveUS20070188970A1Accurate irradiationReliably neutralizeConveyorsElectrostatic discharge protectionSoft x rayOptoelectronics
The present invention provides a charge neutralizer for accurately irradiating a soft X ray into a narrow gap after a glass substrate is lifted up. A soft X ray is introduced into a gap “d” from a soft X ray charge neutralizer 14, and the soft X ray is detected by a soft X ray optical axis monitor 16. Mounting position adjusting means 15 is adjusted by a detection output from said soft X ray optical axis monitor, and optical axis alignment is performed. Next, according to information from a database 19, a control unit 17 controls gap adjusting means 13, and charge neutralization is performed. Charge neutralization can also be performed by controlling the gap “d” by the gap adjusting means 13 while judging neutralizing conditions as to whether a charged potential measured by an electrometer 18 is within an allowable value by the control unit 17 or not.
Owner:FUTURE VISION
Method and device for the measurement of the number concentration and of the average diameter of aerosol particles
ActiveUS7549318B2Quick measurementLess complex apparatusParticle size analysisMagnetic separationDiffusionElectrometer
Owner:TESTO AG
Spin readout and initialization in semiconductor quantum dots
ActiveUS7135697B2Quick initializationEliminate needNanoinformaticsSemiconductor devicesSingle electronSpins
Owner:WISCONSIN ALUMNI RES FOUND
Method and device for the early detection of fires
ActiveCN102257543AIncrease step sizeDiscover fast and reliableFire alarm smoke/gas actuationMicrocontrollerElectrometer
The invention relates to a method for the early detection of fires based on the detection of volatile thermolytic products which are characteristic of the object to be monitored for fires. According to the method, ambient air of an area to be monitored for fires is taken in and ionized, the ionized gas stream being guided through an electromagnetic field, the resulting field strength of which in terms of its temporal or spatial dependency changes the trajectories of the ions in a parameter set in such a manner that positive or / and negative ions of the ionized gas are forced into predefined trajectories and detected. The invention further relates to a device for the early detection of fires using the detection of characteristic volatile thermolytic products which are specific to the objects to be monitored for fires. The device consists of an intake unit (1), an ion generation and ionic current measuring chamber (10) in which the gas stream (5) of the taken-in ambient air is ionized, electrodes (16, 17), having a connection (19) for generating and controlling a DC voltage (21), a ground connection and a connection (18) for generating and controlling an alternating field (20), two electrometer plates (22, 23) which detect characteristic ions, and a microcontroller system (8) which evaluates and stores the temporal dependency of the ionic currents and utilizes a significant change of the measured current at at least one DC voltage value to generate a fire alarm signal.
Owner:MINIMAX LIMITED
Solid domestic waste crushing and sorting device
InactiveCN108906263AImprove classification efficiencyImprove protectionGas current separationPlastic recyclingElectrometerEngineering
The invention discloses a solid domestic waste crushing and sorting device. The device comprises an underframe, the underframe is vertically fixedly provided with a feeding pipeline, the bottom of thefeeding pipeline is provided with a discharging opening, a glass recovery box is arranged below the discharging opening, a discharging tube is arranged at one side of the feeding pipeline below a crusher, the inner wall of the feeding pipeline is provided with a sheet magnet, a powder collecting box is arranged at the injection opening of the discharging tube, one side of the powder collecting box is opened, fans are arranged at one side opposite to the opening, a first conveyor belt is arranged at the bottom of the powder collecting box, a waste paper recovery box is arranged below the outlet of the first conveyor belt, a second conveyor belt is arranged just below the open side of the powder collecting box, the side surface of the second conveyor belt is provided with an electrometer, aplastic recovery box is arranged below the electrometer, and a nonmagnetic metal recovery box is arranged below the outlet of the second conveyor belt. A problem of difficult sorting and recovery ofsolid domestic wastes in the prior art is solved.
Owner:SHAANXI UNIV OF SCI & TECH
Three-dimensional dosage verification apparatus and method thereof
ActiveCN104857639AFunction increaseImprove efficiencyElectrostatic dosimetersX-ray/gamma-ray/particle-irradiation therapyMeasurement deviceElectrometer
The invention relates to a three-dimensional dosage verification apparatus. The apparatus comprises a computer control platform, a multichannel electrometer provided with a three-dimensional dosage measuring head and a three-dimensional water body provided with a three-dimensional motion support arm; a computer control platform is connected with the multichannel electrometer and the three-dimensional water body; the multichannel electrometer is connected with the three-dimensional dosage measuring head; the three-dimensional water body is fixedly connected with the three-dimensional motion support arm; the three-dimensional dosage measuring head is fixedly connected with the three-dimensional motion support arm; the computer control platform is connected with the three-dimensional dosage measuring head through the multichannel electrometer to form a measuring function; and the computer control platform controls the three-dimensional dosage measuring head to perform space translational motion through the three-dimensional motion support arm. The invention provides a multimode three-dimensional measuring apparatus based on the water body and an ionization chamber detector, and a radiation treatment plan three-dimensional verification apparatus and method based on a heavy ion stereo measuring method and a three-dimensional gamma factor analysis method. The functions are diversified, the operation is convenient, the verification result is visual and accurate, the efficiency is high, the cost is low, and the system errors are small.
Owner:INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
Insulator surface electric charge online measuring probe and measuring method thereof
InactiveCN103837753AEfficiently assess security postureMaintain propertiesElectrical measurementsCapacitanceCoaxial cable
The invention relates to an insulator surface electric charge online measuring probe and a measuring method of the insulator surface electric charge online measuring probe. The probe comprises an SMA connector, a shielding part, a coaxial cable and an electrometer. The SMA connector is connected with the coaxial cable through the shielding part. The coaxial cable is connected with the electrometer. The method includes the following steps that firstly, the probe is installed and forms a capacitor C2 with the tested electric charge; secondly, the input voltage U1 is regulated and the output voltage U2 is recorded; thirdly, a change relation curve between the U1 and the U2 is recorded; fourthly, as a C1 is 113pF, a C2 is calculated out through the formula in the specifications; fifthly, capacitance equivalent area A is calculated out through a capacitance computing formula with the C2; sixthly, sensitivity S is calculated out through a formula S=C1 / A; seventhly, the charge density is calculated out through a formula that sigma equals to SU2. By means of the insulator surface electric charge measuring method, the safety state of the GIS can be effectively estimated and the method has a major significance in safe operation of the GIS.
Owner:STATE GRID CORP OF CHINA +1
Electron multiplier testing device for incident electron source generation by adopting photoelectric method
The invention discloses an electron multiplier testing device for incident electron source generation by adopting a photoelectric method, and belongs to the field of gain current test of electron multipliers. The electron multiplier testing device comprises a first working table, a first moving guide rail, an ultra-violet lamp holder, an ultra-violet lamp, a filter holder, a light filter, a ultra-violet transmission glass window, an insulating stand, a fixed station, a photocathode frame, a photocathode, a second working table, a second moving guide rail, an electron multiplier frame, an electron multiplier, a vacuum gage, a first flange, a second flange, a vacuum tank, an observation window, a high-voltage source, an electrometer, a molecular pump, a mechanical pump and a temperature-control system. The electron multiplier testing device adopts the photoelectric method for generation of the incident electron source, which has the advantages of simple structure, long service life, stable performance, low cost and the like, and the electron multiplier testing device takes the zinc film as the photocathode, which is simple in preparation, convenient to operate, and good in repeatability.
Owner:LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
Sensing device and method for rapidly determining concentrations of microbial organisms using interfacial photo-voltages
InactiveUS20090221025A1Simple and cost-effective and reliableEffective interactionMaterial nanotechnologyRadiation pyrometryElectricityIndicator microorganisms
A system for detecting a wide range of microbial organisms, including virus, and determining concentrations in near real-time to determine titer, without the requirement to grow micro-organisms includes an electrometer configured to measure photo-induced interfacial voltages and an electrode assembly with a substrate and at least one electrode on a surface of the substrate electrically coupled to the electrometer. An attachment factor is applied to an exposed surface of each electrode. The attachment factor is effective for interaction with the microbial organism. A transparent vessel for containing the electrolytic solution is provided. The microbial organism may be contained in the electrolytic solution or applied to the coated electrode before being submerged in the electrolytic solution. A light source is configured to controllably produce a flash of activating light directed through the transparent vessel at the electrode causing a sensible photo-induce interfacial voltage indicative of the microbial organism and titer. A corresponding method includes steps of preparing the electrode surfaces with an attachment factor and exposing the submerged electrode surfaces to a flash of activating light to induce interfacial voltages indicative of a determined microbial agent and titer.
Owner:NORTH FLORIDA UNIV OF
Human respiration self-driven flexible respiration sensor and reparation method thereof
ActiveCN109164140AReduce demandEasy to detectRespiratorsMaterial analysis by electric/magnetic meansElectricityElectrometer
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
High-resolution automatic beam detecting device and method thereof
ActiveCN107589440AEasy accessReduce pollutionX/gamma/cosmic radiation measurmentHigh resolution imagingIonization chamber
The invention provides a high-resolution automatic beam detecting device and a method thereof, wherein the device comprises a housing. Two side walls of the housing are respectively provided with a scintillator fluorescent screen and a beam preventer which face each other. The housing is internally provided with a reflector and a CCD camera which is used for detecting light that is transmitted from the scintillator fluorescent screen and is reflected by a reflector. A finger type ionization chamber is inserted into the beam preventer. The finger type ionization chamber is connected with an electrometer. According to the device and the method, distribution and dosage of the beam for clinic treatment at an isocenter can be automatically obtained through one-time beam irradiation, thereby efficiently ensuring acquisition of daily QA data before clinical treatment, reducing pollution of an environment in a treatment chamber by residual beam, and performing a radiation protecting function accordingly. The device and the method can realize the detecting means and the detecting method for performing high-resolution imaging and beam and dosage verification and protection by QA equipment ina small-dimension irradiation field.
Owner:SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI +1
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