252 results about "Electrometer" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.