34 results about "Electrometer" patented technology

The invention relates to the technical field of photoelectric detection, in particular to a photocurrent imaging system based on a probe station and an electrometer. The system generates a focused detection light beam through a light path system, the focused detection light beam irradiates a sample carried by a probe station after being spatially modulated by a mask plate, weak light current signals generated by the sample are collected by an electrometer, and a high-resolution light current distribution image is generated by combining scanning motion of a high-precision electric control displacement platform and intelligent processing of computer software. A physically-driven signal enhancement model, a multi-dimensional noise suppression algorithm and a dynamic imaging optimization formula are innovatively designed, the problems that in the prior art, weak light current detection precision is low, the scale connection error is large, and imaging efficiency is insufficient are solved, accurate quantitative analysis of the photoelectric characteristics of materials is achieved, and the method is suitable for popularization and application. The method is suitable for semiconductor device research and development, solar cell performance evaluation, biosensor detection and other scenes, and has both detection precision and application flexibility.

This invention relates to the field of thermal management and sensing monitoring technology, specifically an intelligent sensing system and method for the working fluid state within a pulsating heat pipe based on temperature monitoring. The method involves arranging pipe sections on a pulsating heat pipe, composed of alternating frictional and non-frictional materials. A ring-shaped copper electrode is attached to the outer wall of the frictional material section and connected to an electrometer, while thermocouples are used to measure temperature in the non-frictional material section. As the working fluid flows through the frictional section, it generates solid-liquid (vapor) frictional charge signals, which are transmitted synchronously with the temperature signal to a processing system. Feature extraction and model analysis are then used to perceive the working fluid's flow state and phase change characteristics in real time, thereby achieving intelligent sensing of the working fluid flow and heat transfer characteristics within the pipe. This invention has advantages such as simple structure, high real-time performance, high sensitivity, and non-invasive monitoring, and can be widely applied to the monitoring of the working fluid state and thermal performance analysis and evaluation of pulsating heat pipes and other phase change heat transfer components.

The present application relates to the technical field of mass spectrometer signal processing, in particular to a mass spectrometer high resistance amplifier fast switching device and method, which is used to solve the problem that the existing mass spectrometer is complex in operation, time-consuming and may affect the performance of the amplifier during the amplifier replacement process; the device comprises an analysis tube and a plurality of receiving cups arranged in the analysis tube, and further comprises a switching circuit board and a plurality of high resistance amplifier modules, the plurality of high resistance amplifier modules are electrically connected to the switching circuit board, the signal input end of the switching circuit board is electrically connected with the plurality of analysis tubes, and the signal output end is connected with the data acquisition port of the mass spectrometer; the method comprises: using a U-shaped jumper to access a high resistance amplifier module with different resistance values according to ion flow with different abundances; the present application can quickly replace the resistance value without disassembling the amplifier, avoids damage caused by frequent disassembly of the instrument, and ensures the cleanliness of the electrometer cavity.

The invention relates to the technical field of mass spectrometers, in particular to a mass spectrometer electrometer which is used for solving the problem that the working stability of the electrometer is poor due to the fact that the temperature in an electrometer cavity of a mass spectrometer in a low-voltage state is not easy to control. The electrometer comprises a mounting base, an outer layer cavity and an inner layer cavity connected into the outer layer cavity are mounted on the mounting base, the inner layer cavity is connected to an external vacuum system, and an amplifier bottom plate and a circuit board bottom plate are mounted in the inner layer cavity; a heat preservation plate is filled between the outer-layer cavity and the inner-layer cavity, a heating piece is installed on the heat preservation plate, a heat conduction rod is rotationally connected into the heat preservation plate, an extension rod is fixedly connected to the first end of the heat conduction rod, and after the stop door is closed, the rotation angle of the heat conduction rod is increased along with the increase of the negative pressure strength of the inner-layer cavity; the contact area between the extension rod and the heating sheet is increased; according to the electrometer, the heat conduction efficiency is changed by adjusting the angle of the extension rod according to the negative pressure state, so that the working stability of the electrometer is improved.

This utility model discloses a roller bonding machine for SCA adhesive, relating to the technical field of SCA adhesive bonding machines. It includes: a base, a worktable fixedly mounted on the top surface of the base, an electrical distribution box fixedly mounted on the left side wall of the base, a controller fixedly mounted on the front side wall of the worktable, a sliding groove on the top surface of the worktable, a movable plate on the top surface of the base, and two fixed blocks fixedly mounted on the top surface of the movable plate. A detection component is included. When the SCA adhesive, due to its high elasticity and thickness, generates static electricity and tends to curl, the adhesive surface instantly attracts the metal blocks, causing the movable blocks to compress a spring and trigger a microswitch. After the detection triggers, the microswitch directly activates an ion gun. The ion air is blown directionally onto the adhesive surface through a hose and air outlet, neutralizing static electricity. This avoids the interference of ambient light and humidity that traditional photoelectric or electrostatic meter solutions are susceptible to, significantly reducing the curling rate and improving the SCA adhesive bonding yield.

One example includes an electrometer system. The system includes a sensor cell comprising an alkali metal vapor within. The system also includes an excitation beam system configured to provide at least one excitation optical beam through the sensor cell to excite the alkali metal atoms from a ground state to a Rydberg energy state. The system also includes a stimulated emission beam system configured to provide a stimulated emission optical beam through the sensor cell to provide energy decay of the alkali metal atoms to a decay energy state that is less than the Rydberg energy state. The system further includes a detection system configured to monitor fluorescent detection light emitted from the alkali metal atoms as the alkali metal atoms decay from the decay state to the ground state to determine signal characteristics of an external signal based on an intensity of the fluorescent detection light.

A low-temperature fluid flow electrostatic accumulation strength measurement experimental device and method, including a transmission pipe section and a test pipe section; the outside of the test pipe section is wrapped with a bare copper wire, and the test pipe section is provided with a copper mesh shield and a stainless steel square cavity shield; the inlet of the stainless steel square cavity shield is connected with the outlet of a first low-temperature ball valve and a low-temperature orifice flowmeter, the inlet of the low-temperature orifice flowmeter is connected with a first low-temperature stop valve and a transmission pipeline, and the outlet of the stainless steel square cavity shield is connected with a second low-temperature stop valve; the inlet of the test pipe section is connected with the outlet of a second low-temperature ball valve and a low-temperature orifice flowmeter; silver electrodes are arranged at the inlet and the outlet of the test pipe section; the outlet pipeline of the test pipe section extends into the inner container of a Faraday cylinder, and the BNC connector of the Faraday cylinder, the silver electrodes, the bare copper wire, the stainless steel square cavity shield, the copper mesh shield and an electrostatic meter are connected; the application studies the electrostatic accumulation current strength generated by the low-temperature working medium flowing in the pipe, and provides support for the electrostatic safety of a low-temperature propellant pipeline transmission system.

The utility model discloses an MOS antistatic function detection device, and specifically relates to the MOS detection technology field, comprising a work bench, the top end of the work bench is fixedly provided with a fixed seat, the outer side wall of the fixed seat is provided with a PWM square wave signal generator, the top of the front end of the fixed seat is fixedly connected with an arch-shaped frame, the inner side of the top of the arch-shaped frame is movably connected with a pressing rod, and the pressing rod is fixedly connected with the fixed seat. A sliding sleeve is fixedly connected to the bottom end of the arch-shaped frame, a sliding rod is arranged on the inner side of the sliding sleeve in a penetrating mode in the vertical direction, a hinged shaft wall is movably connected to the top end of the sliding rod, and the top end of the hinged shaft wall is movably connected with the end of the pressing rod. According to the utility model, limitation of a traditional measuring tool on MOS tube function detection can be effectively overcome, whether the MOS function is intact can be rapidly and effectively detected, whether the antistatic capability of the MOS is compliant can be checked by cooperating with an electrometer, whether the MOS is abnormal can be found only by function test after SMT pasting of the MOS, and the detection efficiency is improved. And the abnormal occurrence frequency and the abnormal product rejection rate are reduced.

One embodiment includes an electrometer system. The system includes a sensor cell comprising alkali metal atoms within and an optical beam system configured to provide at least one optical beam through the sensor cell to provide a Rydberg energy state of the alkali metal atoms, the at least one optical beam exiting the sensor cell as a detection beam. The system also includes a signal generator configured to generate a radio frequency (RF) tuning signal. The system also includes a waveguide extending along a length of the sensor cell, the waveguide being configured to propagate the RF tuning signal in the sensor cell to tune at least one energy state of the alkali metal atoms relative to the Rydberg energy state. The system further includes a detection system configured to monitor the detection beam to detect an external signal based on monitoring the detection beam.

The application relates to the technical field of mass spectrometers, in particular to a mass spectrometer electrometer for solving the problem of poor working stability of the electrometer caused by the difficulty in controlling the temperature in the electrometer cavity of the mass spectrometer under a low pressure state; the electrometer comprises a mounting seat, an outer cavity is mounted on the mounting seat, an inner cavity is connected to the outer cavity, the inner cavity is connected to an external vacuum system, an amplifier bottom plate and a circuit board bottom plate are mounted in the inner cavity; a blocking door is hingedly connected to the mounting seat, a heat preservation plate is filled between the outer cavity and the inner cavity, a heating sheet is mounted on the blocking door, a heat conduction rod is rotatably connected in the heat preservation plate, a lengthening rod is fixedly connected to a first end portion of the heat conduction rod, after the blocking door is closed, the rotation angle of the heat conduction rod is increased with the increase of the negative pressure intensity of the inner cavity, so that the contact area between the lengthening rod and the heating sheet is increased; the electrometer adjusts the angle of the lengthening rod according to the negative pressure state, changes the heat conduction efficiency, and thus the working stability of the electrometer is improved.

The invention relates to an electric sensor (10) for a coherent longitudinal electromagnetic wave emitted by a biological object (1), the sensor comprising a tubular casing (11) comprising a barrel (12) having a front end (13) that is open and a rear end (14) that is closed on the upstream pole of a bipolar switch (15), wherein the downstream pole of the bipolar switch (13) is connected to a potential charge collector (16) made of diamagnetic material, preferably copper. The invention also relates to a system comprising an electrometer designed to co-operate with this sensor (10), and to a measurement method implementing the sensor and the electrometer.

The invention relates to the field of insulating materials, in particular to an insulating material surface charge and surface trap integrated in-situ measurement device which comprises a measurement cavity and a data acquisition system. The measuring cavity comprises a cavity shell, and an electrode, a three-axis screw rod sliding table group, a surface charge measuring unit and a surface trap testing unit which are positioned in the cavity shell; the data acquisition system comprises a static capacitance probe, an electrometer, an oscilloscope and a computer, and the measuring cavity is connected with the data acquisition system through the static capacitance probe; through the integrated design of integrating surface charge measurement and surface trap test in one device, continuous measurement of the same sample can be realized, damage caused by frequent movement of the sample is avoided, distributed measurement of surface charge space-time distribution, surface potential attenuation characteristics and surface trap distribution characteristics of an insulating material can be realized, and the measurement accuracy is improved. The experimental error is reduced, and the measurement efficiency and accuracy are improved.

The utility model discloses a mass spectrometer electrometer with multiple circuit boards, and belongs to the technical field of electrometers. Comprising a stand column, the stand column is provided with a plurality of first grooves, and the first grooves are used for positioning a circuit board; a second groove is formed in the top of the circuit board, a gland is arranged in the second groove, and the circuit board is fastened through the gland; a base is arranged at the bottom of the circuit board, and a sealing ring is arranged on the inner edge of the base; a shell is arranged on the base; a containing cavity is formed in the shell so as to contain the circuit board and the stand column. A locking piece is arranged outside the shell, and the base, the shell and the sealing ring are tightly matched to form a closed cavity under the action of the locking piece; and one surface, far away from the circuit board, of the base is provided with a quick-connection interface, and is connected with vacuumizing equipment through the quick-connection interface. According to the utility model, the circuit boards are uniformly arranged along the vertical columns, so that the arrangement of multiple circuit boards can be realized, and the size is small.

The application discloses a blood coagulation detector, which comprises a driving motor, a blood coagulation cylinder, a connecting rod, a sealing cover, a magnet, a base plate, a pressing plate, a polymer film, an elastic metal plate, an electrode, a working plane and an electrometer, wherein the driving motor is fixedly installed on the working plane, the rotating shaft of the driving motor is provided with the blood coagulation cylinder, the blood coagulation cylinder is provided with the magnet, the working plane is further provided with the base plate and the pressing plate which are fixedly bonded at an included angle, the included angle between the base plate and the pressing plate is an acute angle, the base plate is pasted with the polymer film, the pressing plate is inserted with the elastic metal plate, the elastic metal plate has elasticity, the front end of the elastic metal plate extends towards the polymer film, the front end of the elastic metal plate is fixedly provided with the electrode, the electrode is in contact with the polymer film, and the electrode is connected with the electrometer through the wire. The electrode and the polymer film are periodically contacted and separated to generate an electric signal, and the electric signal is read through the electrometer, so that the blood coagulation time and other parameters can be detected, and the sensitivity is high.

To provide a static induction electrometer that can control the horizontal position of the iron core. [Solution] A static induction electric device having a winding and an iron core, wherein the winding has an inner winding and an outer winding, and the static induction electric device has a winding support plate that holds both the inner winding and the outer winding.

The invention relates to a large beam monitoring device capable of being used under vacuum and high and low temperature conditions, which comprises a spherical vacuum chamber, an electron accelerator beam outlet is connected with the spherical vacuum chamber, a collector is arranged in the spherical vacuum chamber, positive high pressure is applied to the collector, and the outer wall of the spherical vacuum chamber is grounded. An electron beam of the accelerator drifts towards the collector and forms a current signal, the collector is connected with an electrometer outside the spherical vacuum chamber through a cable interface, and the spherical vacuum chamber is further provided with a temperature adjusting device. According to the invention, the influence of geometric asymmetry on electric field distribution is eliminated through the spherical symmetric design, and the measurement uniformity under a large irradiation area is improved; a titanium alloy shell and a multi-layer vacuum sealing structure are adopted, the long-term stability under extreme temperature and high vacuum conditions is ensured, and therefore a high-reliability monitoring tool is provided for spacecraft anti-radiation testing.

The utility model provides a critical ion mobility measuring device. The critical ion mobility measuring device comprises an ion generating system, a high-precision electrometer, an air negative ion measuring instrument and a high-resolution differential electromobility analyzer, the ion generation system is connected with the high-resolution differential electromobility analyzer through a pipeline; the high-resolution differential electromobility analyzer is respectively connected with the high-precision electrometer and the air anion measuring instrument through corresponding pipelines; the other end of the high-precision electrometer and the other end of the negative air ion measuring instrument are connected with the corresponding sucking pumps through the corresponding flow controllers. According to the utility model, the critical ion mobility is calculated according to the ratio of the ion concentration measured by the high-precision electrometer to the ion concentration measured by the air negative ion measuring instrument, and the measurement result of the air negative ion measuring instrument is calibrated, so that the accuracy of the measurement result is improved; according to the utility model, the carrier gas is used for conveying ions; and the critical ion mobility is measured according to a high-precision electrometer and an air negative ion measuring instrument.

The application belongs to the field of insulator measurement, and relates to an insulating resistance leakage current measurement system and method, which comprises a constant-temperature and constant-humidity isolation box, a high-voltage direct-current power supply, an insulating resistance clamp, an electrometer and a computer. The insulating resistance clamp comprises a copper plate upper electrode, a copper plate lower electrode, a protection electrode, a spring pull rod and a support. The top surface of the copper plate upper electrode is fixedly connected with the bottom of the spring pull rod. The spring pull rod is provided with a rotating bolt, by which the spring tensile modulus can be scaled. The copper plate lower electrode is located below the copper plate upper electrode. The protection electrode is located on both sides of the copper plate lower electrode. The top of the spring pull rod is connected with the high-voltage direct-current power supply. The electrometer is connected with the copper plate lower electrode. The electrometer is connected with the computer through a data transmission line. The application can conveniently correct data fluctuation occurring in the measurement process in time, and improve the efficiency and accuracy of measurement.

The invention relates to a calibration method and device for an ionization chamber type beta applicator monitor. A balance cover is arranged on an ionization chamber main body in the beta applicator monitor; during calibration of a 90Sr-90Y beta standard radiation field, the ionization chamber main body is not provided with the balance cover; when a 60Co gamma standard radiation field is calibrated, a balance cover is mounted on the ionization chamber main body, a beam axis of a ray is aligned with the center of the ionization chamber main body, and the thickness of the balance cover is not smaller than the maximum penetration distance of the ray in a material corresponding to the balance cover; alternately applying positive and negative polarity high voltage to the ionization chamber main body, ionizing working gas in the ionization chamber main body by rays to generate ionization current, and measuring the ionization current through an electrometer; based on the ionization current, a calibration factor is obtained. According to the ionization chamber, the technical effect that the ionization chamber main body accurately monitors the high-dose-rate beta rays emitted by the beta applicator is achieved.

The application discloses a kind of based on corona discharge source's collector type potential measuring device and method, wherein measuring device includes: to be measured electrified body, corona discharge needle electrode, annular ground electrode, ground metal net, suspended collector electrode, ground casing, polytetrafluoroethylene insulating layer, current-limiting resistor, microampere ammeter;Measuring method includes: collector type potential measuring device is connected with to be measured electrified body, sets input voltage and is discharged to to be measured electrified body, obtains the equivalent resistance value after discharge, obtains the potential of to be measured electrified body based on input voltage and equivalent resistance value.The application replaces the radioactive source in traditional collector type electrometer by the electronic source of corona discharge, realizes the advantage that collector type electrometer is higher in accuracy, can also avoid the security risk and use limit brought by radioactive source.

This invention relates to a device for measuring the charge distribution of oil flow using a local transformer model. The device includes a temperature-controlled oil tank, a circulating pump, a speed regulating device, a buffer tank, a test chamber, and a measuring chamber. The temperature-controlled oil tank, circulating pump, buffer tank, test chamber, and measuring chamber are sequentially connected by insulated pipes. The measuring chamber is connected to the temperature-controlled oil tank via an insulated pipe. The speed regulating device is connected to two insulated pipes connecting the circulating pump. A flow meter is installed on the insulated pipe connecting the buffer tank and the test chamber. A first electrometer and a second electrometer are connected to the test chamber. A third electrometer is connected to the measuring chamber. A vacuum pump is connected to the insulated pipe connecting the measuring chamber and the temperature-controlled oil tank. This invention can accurately determine the degree of charge in oil flow and study the spatial distribution characteristics of the charge in oil flow, belonging to the technical field of oil flow charge measurement equipment.

The invention relates to the technical field of mass spectrometer signal processing, in particular to a rapid switching device and method for a high-resistance amplifier of a mass spectrometer, and is used for solving the problems that an existing mass spectrometer is complex in operation and long in consumed time and possibly affects the performance of the amplifier in the amplifier replacement process. The device comprises analysis tubes and a plurality of receiving cups arranged in the analysis tubes, and further comprises a switching circuit board and a plurality of high-resistance amplifier modules, the high-resistance amplifier modules are electrically connected to the switching circuit board, the signal input end of the switching circuit board is electrically connected with the analysis tubes, and the signal output end of the switching circuit board is connected with a mass spectrometer data acquisition port; the method comprises the following steps of: accessing high-resistance amplifier modules with different resistance values by using U-shaped jumpers according to ion currents with different abundance; the resistance value can be rapidly replaced without dismounting the amplifier, damage caused by frequent dismounting of an instrument is avoided, and meanwhile the cleanliness degree of the electrometer cavity is guaranteed.

The invention discloses an ultrahigh / extremely high thermal cathode vacuum gauge calibration and simulation integrated platform, which relates to the technical field of vacuum test instruments, and is characterized in that an ionization gauge sensing unit ball is connected with an air inlet flowmeter, a mass spectrometer and a comparison vacuum gauge, and an extremely high evacuation unit provides ultimate vacuum pressure for an ionization gauge sensing unit ball chamber; the pre-evacuating unit is used as a pre-evacuating pump after a to-be-tested thermionic cathode ionization gauge is replaced, the automatic parameter adjusting unit is used for providing continuous and adjustable electrical parameters, the electrometer is used for acquiring ion flow acquisition signals, and the mass spectrometer is used for providing a deflation rate and component analysis function. The comparison vacuum gauge and the air inlet flow meter form a calibration and simulation integrated platform flow detection and control unit, and the calculation unit serves as an intelligent control unit and provides algorithm processing, electrical parameter adaptation and data processing work for the calibration and simulation integrated platform. Through the calibration and simulation integrated design of the to-be-tested vacuum gauge, a real simulation environment is provided for development, optimization, iteration and shaping of the ultrahigh / extremely high thermal cathode vacuum gauge.

To provide a safety device of a conveying facility capable of preventing the occurrence itself of dust explosion.SOLUTION: A safety device for avoiding dust explosions in a chain conveyor 2 for transporting wood pellets 1 through a closed space 3a surrounded by a conveyor case 3 includes electrostatic meters 15 (electrostatic detectors) disposed in respective connected sections of the conveyor case 3, infrared cameras 19, 20 (temperature detectors) for detecting at least one of a surface temperature of the wood pellets 1 in the conveyor case 3 and a temperature of a transport path (a transport chain 10 and a scraper 11), an anemometer 21 (wind speed detector) for detecting a speed of wind flowing through the closed space 3a, and a control device 16 for activating a danger avoidance mode.SELECTED DRAWING: Figure 1

A quantum device comprising a plurality of qubits, a demultiplexing circuit, a common transmission line for transmitting qubit read signals to the demultiplexing circuit, and, for each qubit of the plurality, one quantum electrometer coupled to the qubit with a view to transmitting, over the common transmission line, a signal depending on a current state of the qubit and on a periodic excitation applied to the quantum electrometer. The quantum device is noteworthy in that, the periodic excitations transmitted to a group of qubits of the device being transmitted with an identical frequency, the device comprises phase-shifting means that introduce distinct phase shifts and optionally amplitude-attenuating means that introduce amplitude differences into the excitations respectively applied to the various quantum electrometers.

One embodiment includes an electrometer system. The system includes a sensor cell comprising alkali metal atoms within, and an optical beam system configured to provide at least one optical beam through the sensor cell to provide a first Rydberg energy state of the alkali metal atoms, the at least one optical beam exiting the sensor cell as a detection beam. The system also includes a tuning laser configured to generate a tuning beam having a predetermined tuning frequency between the first Rydberg energy state and an intermediate energy state of the alkali metal atoms. The system further includes a detection system configured to monitor the detection beam to detect an external signal having a frequency that is approximately equal to an energy difference between the first Rydberg energy state and a second Rydberg energy state based on monitoring the detection beam.

The invention discloses a measurement and control system for electron multiplier acceleration testing, and belongs to the field of electron multiplier service life testing. The system comprises a vacuum system, an electronic gun servo module, a program control high-voltage source, an electrometer, a universal meter and a computer measurement and control program. The system adopts a modular design, and the vacuum system provides an electron multiplier test vacuum degree and an electron gun working vacuum degree; the electron gun servo module comprises an electron gun current source and an electron gun potential servo module and is used for accurately controlling the size of an incident electron beam current of the electron multiplier; the program-controlled high-voltage source can be controlled by a computer program and provides working voltage for the multiplier, and the multiplier is externally connected with a divider resistor port and a current collecting port. The electrometer and the universal meter are used for collecting data. The computer control software is written by MATLAB language and has a graphical interface. After the output of the current source and the potential of the electron gun are fixed, a control program controls the output voltage of the program-controlled high-voltage source through a serial port by collecting the output current of the multiplier, so that the multiplier is ensured to work in a fixed gain mode. The incident current is controlled to be at a relatively large value, and the total output charge number when the multiplier fails can be obtained through an acceleration test in a fixed gain mode.

QUANTUM APPLICATION ELECTRONIC DEVICE COMPRISING A CAPACITIVE READING AMPLIFIER The present description relates to a quantum application electronic device (100) comprising at least: - a quantum dot (102) intended to form at least one spin qubit; - an electrometer (104) electrostatically coupled to a potential well of the quantum dot (102), comprising at least one input electrode (106) on which an excitation signal is intended to be applied and at least one output electrode (108) distinct from the input electrode (106) and on which a reading signal is intended to be delivered;- a transimpedance amplifier (116) with a feedback loop including at least one capacitor (150, 152, 154), the transimpedance amplifier (116) comprising two differential inputs (118, 120) at least one of which is coupled to the output electrode (108) of the electrometer (104), and a local common mode stabilization circuit (164, 166). Figure for abstract: Fig. 1;

The invention provides a powder friction live line measurement device and measurement method based on multi-point real-time monitoring, the device comprises a chute, a multi-point charge monitoring system, a charge quality synchronous measurement system and a data integration processing system, the chute is obliquely arranged, and the inclination angle is adjustable; the multipoint charge monitoring system comprises a plurality of through hole type Faraday cylinders which are arranged at intervals along the length direction of the chute, a bottom Faraday cylinder which is arranged at the tail end of the chute, and an electrometer which is connected with the bottom Faraday cylinder and the through hole type Faraday cylinders. According to the invention, through the plurality of through hole type Faraday cylinders arranged along the chute, visual monitoring of a powder friction electrification process can be realized, and then a core area where static electricity is generated is accurately positioned, so that accurate protection of equipment is realized, the experiment safety is improved, and the risk control cost is reduced.

The utility model discloses a low common mode interference electrometer, and belongs to the technical field of electrometers. Comprising an electrometer, and the input end of the electrometer is provided with an anti-interference module; the anti-interference module comprises a circuit board, an operational amplifier, a wire A and a wire B are arranged on the circuit board, the wire A and the wire B are connected with different pins of the operational amplifier, and an input signal and an input signal ground are directly bridged on the circuit board through the wire A and the wire B; the wire A and the wire B have the same model and length and are parallel to each other. According to the utility model, the parallel input signal ground leads with the same length and the same model are bridged on the edge of the input signal lead. The same common-mode interference can be generated on the input signal wire and the output signal ground wire, and the influence of the common-mode interference on the signals is reduced by utilizing the extremely high rejection ratio of the operational amplifier to the common-mode signals, so that the stability of the electrometer is improved.