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825results about "Electrostatic field measurements" patented technology

Device, system and method for measuring space charges by using electro-acoustic (PEA) method

The invention provides a device, a system and a method for measuring space charges by using an electro-acoustic (PEA) method. The device comprises a first electrode, a second electrode, a first thermostatic source, a second thermostatic source, a high-voltage direct current power supply, a pulse generator and a piezoelectric transducer, wherein the first electrode is used for contacting with one surface of the tested insulation material sample; the second electrode is used for contacting with the other surface of the tested insulation material sample; the first thermostatic source is used forconducting the temperature to the first electrode; the second thermostatic source is used for conducting the temperature to the second electrode; the high-voltage direct current power supply is used for transmitting the high-voltage direct current to the first electrode; the pulse generator is used for transmitting a high-voltage pulse signal to the first electrode; the piezoelectric transducer is used for detecting the acoustic signal of the tested insulation material sample, generated by the functions of the temperature gradient field, the high-voltage electric field and the high-voltage electric pulse, and is used for converting the acoustic signal into an electrical signal to output. The invention is used for measuring the distribution of the space charges in the high-voltage direct current power equipment insulation in the temperature gradient field.
Owner:XI AN JIAOTONG UNIV

Storage capacitor power supply

A long-lived, lightweight, and quickly and precisely charged storage capacitor power supply capable of stably supplying electric power to a load. The power supply has a capacitor block consisting of capacitors connected in series, in parallel or in any combination of series and parallel. The power supply further includes a charging circuit for charging the block, a charging power supply connected with the block via the charging circuit, and a charge-limiting circuit. This charge-limiting circuit detects the voltage across the terminals of the block and limits charging of the block if the voltage reaches a given value. One embodiment of the invention further includes a charge-limiting circuit, a full charge-detecting circuit, and a residual electricity-detecting circuit connected in parallel with the block. The charge-limiting circuit senses that the voltage across the terminals of the block exceeds the given value and causes the charging current to bypass the block. The full charge-detecting circuit senses that the charge-limiting circuit is operated and determines that full charge is attained. The residual electricity-detecting circuit finds the residual electric power from the voltage across the terminals of the block. Another embodiment has a first and a second capacitor block. The voltage across the terminals of the first block is detected. The first block is charged from the second block until the detected voltage reaches a given voltage. The first block supplies electric power directly to the load.
Owner:NANTONG JIANGHAI CAPACITOR CO LTD +1

Electric field detection method and device based on stark effects of Rydberg atoms

The invention relates to a weak electric field detection technology, particularly relates to an electric field detection method and device based on stark effects of Rydberg atoms, and solves the technical problems that the measurement on an electric field, particularly a weak electric field, is not accurate enough at present, and the sensitivity is not high enough. The electric field detection method based on the stark effects of the Rydberg atoms comprises the following steps: (a) oppositely arranging two beams of laser and collinearly emitting the laser into a sample tank which is internally filled with alkaline metal atom steam; (b) acquiring a signal of the second beam of the laser emitted out by the sample tank and converting the signal into a corresponding electric signal; and (c) analyzing the acquired electric signal, and if the electric field exists, observing an absorption spectrum with a stark cracking phenomenon from the signal, so as to further solve the intensity of the electric field E. According to the electric field detection method and device based on the stark effects of the Rydberg atoms, the electric field can be measured by the stark effects with an alkaline metal atom Rydberg energy level; the measurement precision is high and the electric field strength which is weakened to an mV/cm grade can be measured.
Owner:SHANXI UNIV

Microwave electric field intensity meter based on cold Rydberg atom interferometer and measuring method thereof

ActiveCN104880614AHigh measurement accuracyMake up for the defect that only point frequency measurement can be realizedElectrostatic field measurementsRydberg atomBeam splitting
The invention discloses a microwave electric field intensity meter based on a cold Rydberg atom interferometer and a measuring method thereof. The microwave electric field intensity meter comprises: a vacuum system, which is used for cooling and trapping atom to generate a cold atom cloud for preparing a Rydberg state and generating an interference effect so as to generate a phase difference by coherent atomic states; a laser, which is used for generating coupling light and detection light and exciting the cold atom in the vacuum system from a ground state to the Rydberg state coherently; a photoelectric detector, which is used for detecting an interference fringe generated by two beams of cold atom clouds due to coherence; and a microwave source, which is used for generating a microwave electric field. According to the invention, when the microwave electric field intensity meter is applied to the evolution process of coherent beam splitting and combination, the atom cloud in the Rydberg state interacts with a to-be-measured microwave electric field, thereby generating an alternating-current stark effect; and the to-be-measured microwave electric field intensity is associated with a phase generated by the an alternating-current stark, thereby realizing precise measurement of the microwave electric field.
Owner:清远市天之衡量子科技有限公司

Resonance miniature electric field sensor

ActiveCN101685119ARealize constant amplitude self-excited vibrationGuaranteed to work automaticallyTelevision system detailsImpedence networksElectric field sensorInterference resistance
The invention relates to a resonance miniature electric field sensor. The sensor comprises a substrate, an exciting electrode with a comb structure, a vibration sensitive electrode with a comb structure, a shielding electrode, an electric field inductive electrode, a crossbeam and a supporting beam, wherein the exciting electrode with the comb structure is fixed on one side of the substrate by ananchor point, while the vibration sensitive electrode with the comb structure is fixed on the other side of the substrate by an anchor point; the shielding electrode and the electric field inductive electrode are fixed on the area of the substrate in the middle of the exciting electrode and the vibration sensitive electrode; the shielding electrode and the electric field inductive electrode are alternately arranged; the crossbeam is positioned in the middle of the shielding electrode; one end of the supporting beam is fixed on the substrate by the anchor point, while the other end is connectedwith the exciting electrode and the vibration sensitive electrode. The resonance miniature electric field sensor can reduce the static exciting voltage of a device, improve the sensitivity and precision of the sensor, and further improve the environment interference resistance capability of the sensor.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI

System and method for measuring high voltage cable space charges based on electroacoustic pulse method

InactiveCN103605008ARealize space charge distribution measurementReliable data baseElectrostatic field measurementsCapacitanceHigh voltage capacitors
The invention relates to a system and a method for measuring high voltage cable space charges based on an electroacoustic pulse method. A high voltage pulse source and a high voltage capacitor are connected in series and are then connected with measuring electrodes at two ends of a tested piece, a high voltage power source is further connected with the measuring electrodes at two ends of the tested piece through a current limit resistor, a piezoelectric sensor closely clings to the lower measuring electrode, the piezoelectric sensor acquires a stress wave signal and sends the processed signal to a computer to form the measuring system, the high voltage power source can be a direct current high voltage power source and further can be an alternating current high voltage power source, the alternating current high voltage power source is connected with a phase detection unit, and a phase detection circuit outputs a synchronous control signal to a pulse generation unit of the high voltage pulse source. The high voltage power source forms space charges in an insulation layer of an electric power cable through electrodes, disturbance of the charges in the insulation layer of the electric power cable is realized through the high voltage pulse source to form dynamic stress waves, the measuring system acquires a signal of a pressure sensor, and a distribution state of the space charges of the electric power cable is analyzed. Through the system and the method, measurement on the distribution state of the space charges in the insulation layer of the electric power cable under the alternating current state is realized.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER

1000kv extra-high voltage ac non-contact type electricity checking method and apparatus

The invention provides a 1000kV ultrahigh voltage alternating current non-contact-type electroscopy and an electroscope thereof, the hardware part of the electroscope consists of a signal acquisition module, a signal amplification module, a signal processing module, an analog-to-digital conversion and data processing module and an alarm module, the software part thereof is divided into five stages comprising self-check, pre-check, checkup, comparison and alarm; after the self-check is passed and time delay of 3 seconds elapses, a value, which is obtained by performing a data acquisition in 10KHz frequency on the electric field intensity of the working location, is regarded as a reference value for the electroscopy, the inventive reference value is an electric field value of the on-site working location, which effectively enhances the use range and accuracy of the electroscope; the invention implements the electroscopy in terms of field intensity curves of space electric fields and gives a reflection of the size of the electric field via the frequency velocity of acoustic, optical signals for the alarm, which effectually eradicates the interferences from adjacent charged equipment and settles the difficult problem of inferior repetitiveness and low accuracy of the electroscopy result which is resulted from the interference with the space field intensity by charged bodies of the adjacent measured equipment.
Owner:STATE GRID ELECTRIC POWER RES INST

Measurement mechanism and measurement method of ferroelectric materials electric hysteresis loop wire

The invention discloses an apparatus for measuring the ferroelectric hysteresis of ferroelectric materials which is based on a current measurement circuit, as well as a measurement method thereof. The invention inputs a simulated output signal generated by a computer processing unit into a high voltage amplifier through a signal source and a data acquisition board, thus giving excitation voltage to a sample being tested, and then through a sampling resistance R0, sampled current signal is input into a signal regulating module through an operational amplifier, and then the sampled current signal is transmitted back into the computer processing unit through the data acquisition board. By separating the current signal acquired from the measurement into three parts as linear polarization, non-linear polarization and electric loss, the measurement system is provided with not only the function of measuring the P-E relationship, but also the function of acquiring the relationship between the real spontaneous polarization and induced polarization of the dielectric substance being tested and the field intensity. Furthermore, by superimposing actuating signal of a small alternative electric field to a bias electric field with constant intensity and synchronously collecting the corresponding change information of the polarization intensity of the sample being tested, then the reversible permittivity can be acquired.
Owner:XI AN JIAOTONG UNIV

Comprehensive underground test method for deformation and damage of terranes of mining top plate and mining bottom plate of coal bed

ActiveCN101581234AGood for fine graspAccurate determination of damage depth valuesMining devicesSeismology for water-loggingSeismic velocityEngineering
The invention discloses a comprehensive underground test method for deformation and damage of terranes of mining top plate and mining bottom plate of a coal bed, comprising the following steps of: (1) constructing a comprehensive test system; (2) utilizing a network parallel electrical method to synchronously collect test electrode supply current and potential signal in boreholes of the top plate and the bottom plate, thus obtaining the electric field distribution situation between the top plate and the bottom plate of the working face in a control area; (3) respectively extracting the electric field parameter distribution situation of rock masses, the seismic velocity distribution situation and the displacement variation of terranes at different places in the borehole in the control area according to the collected data characteristics of various geophysical fields; (4) dynamically obtaining the parameter change of the geophysical fields in a detected area at different time along with the advancing state of the working face; and (5) completing the installation and sealing of facilities in the tested borehole before the stoping of the coal face. The method precisely masters the damage situation of the rock masses, thus not only delimitating the deformation and damage distribution situation of rock masses in the control area, but also precisely determining the water-guiding fissure zone height of the covered rock masses of the top plate and the damage depth value of the bottom plate.
Owner:张平松 +1
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