37 results about "Ultrahigh frequency" patented technology

The application discloses a VFTO-induced partial discharge causality determination method based on time sequence characteristics, relates to the technical field of power equipment state monitoring, and comprises the following steps: acquiring a VFTO detection data set and an ultrahigh frequency partial discharge detection data set synchronously collected by an integrated sensing device; preprocessing each VFTO collection data and ultrahigh frequency partial discharge collection data; determining each causally related quantitative value; determining whether the collection data corresponding to each VFTO time sequence characteristic structure unit is partial discharge induction source data based on the causally related quantitative value; and outputting a VFTO-induced partial discharge causality determination conclusion based on the causality determination rule. After the integrated sensing device synchronously collects VFTO and ultrahigh frequency partial discharge multi-physical quantity data, the application can automatically mine the time sequence coupling correlation of the two, analyze the internal logic of insulation impact and discharge behavior, realize end-to-end intelligent analysis, and effectively improve the accuracy of VFTO-induced partial discharge causality determination.

The application discloses a partial discharge detection method and device and a nonvolatile storage medium. The method comprises the following steps: based on a plurality of preset sensors, absolute field strength data and electromagnetic wave space-time data inside a cavity of a target device are acquired at a plurality of preset positions inside the cavity of the target device, wherein the plurality of sensors comprise a plurality of Rydberg sensors and a plurality of ultrahigh frequency sensors; the absolute field strength data and the electromagnetic wave space-time data at the same time are integrated to obtain a plurality of joint data frames; and based on the joint data frames, a partial discharge detection result of the target device is determined, wherein the partial discharge detection result comprises a discharge type, a defect position and an insulation state. The application solves the technical problem that the traditional technology is difficult to realize high-precision, multi-parameter and traceable monitoring requirements in a complex electromagnetic environment.

The application provides a partial discharge detection device based on multi-physical quantity collaborative sensing, belongs to the technical field of electrical engineering, and comprises a detection device shell, a sealing column, an ultrasonic sensing module, an ultrahigh frequency sensing module, a filtering and amplifying module, a light source module, a photoelectric conversion module and a gas insulated equipment. The bottom of the detection device shell is integrally formed with the sealing column. The bottom of the sealing column is electrically connected with the ultrasonic sensing module. The bottom of the ultrasonic sensing module is electrically connected with the ultrahigh frequency sensing module. The upper surface of the detection device shell is electrically connected with the filtering and amplifying module, the light source module and the photoelectric conversion module. The application avoids the complicated processes such as power failure, gas recovery, vacuum extraction, gas filling, standing and leakage detection that must be experienced in the traditional installation mode, shortens the original maintenance time of several hours or even several days to several minutes, greatly improves the power supply reliability, and reduces the operation and maintenance cost.

The application discloses a kind of λ / 4 stepped impedance transformation method and system.Therein, the method includes: in the impedance mismatching of partial discharge ultrahigh frequency load impedance and the characteristic impedance of partial discharge ultrahigh frequency measurement system, access λ / 4 stepped impedance transformation two-port network, the load impedance is wave impedance;According to characteristic impedance Z 0, wave impedance Z L And the characteristic impedance of two-section λ / 4 transmission line Z 1, Z 2, determine partial voltage reflection coefficient;According to the partial voltage reflection coefficient, determine total voltage reflection coefficient;According to the total voltage reflection coefficient, broaden the working frequency band of λ / 4 stepped impedance transformer.Therefore, break through the limitation of direct matching, by the progressive stepped impedance matching mode of sensor element, realize partial discharge ultrahigh frequency signal sensor element and subsequent radio frequency processing circuit good matching, thereby reduce the partial discharge ultrahigh frequency signal attenuation caused by impedance mismatching.

The embodiment of the application discloses a discharge detection method for surface defects of an insulator and related equipment, through obtaining a plurality of ultrahigh frequency electromagnetic wave signals and low-frequency electric field time-domain waveform signals of the surface defects of the insulator within a preset detection period, and performing eigenvalue extraction to obtain an amplitude mean value, an amplitude variance and a phase variance corresponding to the ultrahigh frequency electromagnetic wave signals, and a voltage zero-crossing moment electric field amplitude, a voltage and electric field waveform cross-correlation coefficient and an electric field waveform kurtosis factor corresponding to the low-frequency electric field time-domain waveform signals, multi-dimensional information reflecting the discharge state of the surface defects of the insulator is comprehensively obtained; a discharge degree evaluation factor is calculated in combination with a preset weight, the influence of various eigenvalues on the discharge degree can be comprehensively considered, and occasional and weak discharge signals can be effectively captured; whether the insulator discharges or not is judged according to the discharge degree evaluation factor and a preset threshold value, and the accuracy and reliability of the discharge detection result are improved.

The application provides a transformer partial discharge positioning method based on digital twinning, relates to the technical field of power equipment state monitoring and fault positioning, and comprises the following steps: S1, inputting the structural parameters of a transformer, sensor candidate coordinates and electromagnetic wave propagation speed; constructing a three-dimensional digital twinning model comprising a transformer tank, a core and winding internal components according to the input parameters, and discretizing the internal space of the model and the surface of the components into a spatial point array network; S2, defining the transmission rule of partial discharge ultrahigh frequency signals according to the spatial point array network, and the rule stipulates that the signals only propagate between the free space nodes and the component surface nodes. Reliable collection of ultrahigh frequency partial discharge signals, accurate modeling of the propagation path, stable solution under multi-source interference and traceable analysis of the whole process data can be realized under the constraint of the complex electromagnetic structure inside the transformer.

The utility model discloses an intelligent tool cabinet using ultrahigh frequency technology to carry out warehouse management, include: cabinet, set up on the control system of cabinet, set up on the cabinet door of cabinet, set up on the electric lock of the door frame of cabinet corresponding cabinet door, control system and electric lock electric connection, its characterized in that, the inside setting of cabinet has identification module, and the tool in storage in cabinet is provided with identification element, identification module and control system electric connection, identification module carries out identification to identification element and will identification result transmission to control system. The utility model discloses through identification module to the identification element that binds on the tool detection identification, will corresponding detection information feedback to control system in, realize the warehousing and inventory of tool, reduce the efficiency delay that needs to place the tool on the matching position when returning the tool, effectively satisfy the demand of tool efficient warehouse management.

The application discloses a full-band GIS ultrahigh frequency partial discharge pulse non-loss collection system and belongs to the technical field of intelligent sensing of primary equipment. The system comprises a signal collection and conditioning module, a double-channel high-speed ADC module and a high-speed data processing and storage module. The signal collection and conditioning module is used for connecting an ultrahigh frequency sensor signal and performing filtering and amplification preprocessing on the signal. The double-channel high-speed ADC module comprises two independent and synchronous collection channels and is used for synchronously collecting the preprocessed signal in a full band. The high-speed data processing and storage module is used for controlling the alternate collection of the double channels, real-time linear compensation, trigger timing control and real-time signal processing. The intelligent analysis and control module is used for performing real-time analysis and fault diagnosis on the collected data and dynamically adjusting system parameters. The application adopts a double high-speed channel collection single signal and realizes a cooperative working mechanism of mutual backup, effectively avoids pulse loss caused by system processing delay, and improves the accuracy of partial discharge analysis and the intelligent level of equipment state sensing.

This invention discloses an ultra-high frequency control system and method for piezoelectric stack actuators. The system includes a LabVIEW-based high sampling rate drive control system and a charge amplifier. The LabVIEW-based high sampling rate drive control system generates drive signals for the piezoelectric stack actuator, acquires displacement signals of the piezoelectric stack actuator, and processes the acquired displacement signals and drive signals to obtain control signals for the piezoelectric stack actuator. The control signals are output to the charge amplifier, which receives and amplifies the control signals. The amplified control signals are then sent to the piezoelectric stack actuator. This invention achieves high-precision trajectory tracking of the piezoelectric actuator at high operating frequencies, with tracking errors reaching the tens of nanometers level under high-frequency operating conditions.

Communication system for trucks, comprising a UHF radio module for wireless transmission of standardized picto signals in the frequency range of 433 MHz or 868 MHz, a display and control module with a 172×320 pixel 262K color IPS touch display, a dual-core processor with a clock frequency of up to 240 MHz for processing, selecting and displaying the picto signals, a control unit for transmitting at least ten defined picto signals and a power supply via the 12 / 24 V electrical system of a truck, wherein the system is designed for the vehicle-to-vehicle transmission of safety-relevant information between preceding and following trucks.

The application discloses an ultrahigh-frequency heating ultrahigh-temperature multi-field CT in-situ loading system and method, and belongs to the field of high-temperature mechanical testing.The application comprises a mechanical loading testing machine, a high-temperature furnace, a clamp unit and a cooling system.The high-temperature furnace and the clamp unit are fixed to the testing machine and the furnace respectively through an adapter, and the furnace wall water cooling pipeline constitutes the cooling system.The mechanical loading testing machine realizes loading and unloading of the sample and rotation during scanning.The high-temperature furnace is a cylindrical double-furnace structure, which is composed of a front furnace body and a rear furnace body, and is provided with multiple types of installation holes and is sealed.The ultrahigh-frequency coil completes heating and heat preservation, and the clamp unit clamps the sample.The application can realize ultrahigh-temperature heating of not less than 2500 DEG C and in-situ testing of thermal-force-oxygen multi-field coupling based on the ultrahigh-frequency heating mode, has a large CT scanning field, a spatial resolution of up to 3 mu m, supports multi-mode temperature measurement calibration and coupling testing, can realize 100kN super large load loading, the furnace body is easy to disassemble and assemble, the operation difficulty is effectively reduced, and the ultrahigh-temperature in-situ experiment efficiency and testing quality can be greatly improved.

This invention discloses an automated testing device and method for ultra-high frequency induction heating power supplies. The device includes a control system, a signal generation and conditioning module, a status control module, a parameter acquisition module, a communication module, and a display module. When the power supply under test is off, the control system sends input signals such as 5V, 10V, PWM, infrared temperature measurement, and water pressure detection, and receives sampled feedback data to determine whether calibration is needed or if the sampling circuit is abnormal. When the power supply is on, it sends a specific power input and collects DC voltage, grid current, and output coil current to determine whether the actual operating power and output heating capacity meet design requirements. Based on the results, it performs a fault shutdown or proceeds to the next factory setting stage. This invention improves testing efficiency, consistency, and fault location accuracy, and is suitable for automated factory testing of ultra-high frequency induction heating power supplies.

This invention relates to the field of electromagnetic relay manufacturing technology, and discloses an ultra-high frequency induction brazing device for an electromagnetic relay contact spring system, comprising: a worktable, a fixture, a moving mechanism, and an ultra-high frequency induction brazing machine; the fixture is disposed on the worktable surface and is used to clamp and fix the contact spring system; during welding, a spring sheet is sleeved on the Kovar alloy lead-out rod in the contact spring system to form a welding point between the two; the output end of the moving mechanism can move along a first direction and a second direction, and the induction brazing head of the ultra-high frequency induction brazing machine is disposed on the moving mechanism; during operation, the moving mechanism drives the induction brazing head to move along the first direction and the second direction, so that the induction coil of the induction brazing head is aligned with each welding point. This device adopts non-contact induction heating, completely avoiding the use of carbon rod electrodes, eliminating the generation of excess carbon powder from the source, and greatly improving the internal cleanliness and long-term operational reliability of the electromagnetic relay.

The application relates to a frequency division multiplexing ultrahigh frequency RFID label, and relates to the technical field of the frequency division multiplexing ultrahigh frequency RFID label. The application comprises a general basic radiation module configured to work in a predetermined wide frequency band; the general basic radiation module comprises a replaceable frequency point tuning module which is detachably electrically connected to the general basic radiation module; and a standardized interface formed between the two; the replaceable frequency point tuning module is coupled with the general basic radiation module through the standardized interface, and is used for tuning the overall resonance frequency of a resonance unit to a target discrete frequency. The application realizes flexible and accurate configuration of the resonance frequency by modularizing separation of the wideband radiator and the narrowband tuner and designing a standardized coupling interface; meanwhile, the production supply chain is greatly simplified, the material and management costs of the multi-frequency point product are reduced, and the miniaturization of the overall structure is promoted.

Disclosed are passive reflector radio communications systems, such as for UHF frequencies or greater than UHF frequencies, and related deployment systems and devices that provide underground communications. Embodiments of the system include reflector elements to provide passive radio communications, structural frameworks to support and orient the reflector elements, methods for calculating reflector size, shape, and position corresponding to a desired wavelength, and deployment methods and devices to install the communication system at a desired location. The passive reflectors can be placed in a folded or otherwise compact mode, for transport into underground tunnels. Once at the desired installation location, the system can be installed, with the reflectors positioned appropriately for the radio frequencies used at the location. Some of the embodiments include any of vertical or horizontal foldable reflector poles, reflective sheets, reflective mesh sheets and / or ropes, inflatable reflective pucks, and rapid deployment systems and methods.

This invention relates to the field of injection mold technology, specifically to an ultra-high frequency induction coil embedded weld line elimination device for injection molds. The device includes a device body, an ultra-high frequency induction coil body, a magnetic collecting head, an isolation cover, a cooling ring, a cylinder, and a lever mechanism. The device body is detachably embedded in a mounting groove at the bottom of the fixed mold of the injection mold. The magnetic collecting head is wedge-shaped with its tip facing the straight area where the weld line occurs within the mold cavity. During injection molding, the ultra-high frequency induction coil body is energized to generate a high-frequency magnetic field, achieving localized heating of the cavity surface within seconds. After heating, the cylinder drives the isolation cover and the magnetic collecting head to move backward as a whole, while the lever mechanism drives the cooling ring to move in the opposite direction and fit against the mold. Coolant circulates through the annular cooling channel within the cooling ring, forcibly cooling the device. This solves the problems of slow response, severe heat diffusion, and difficult maintenance associated with traditional resistance heating, achieving precise and rapid elimination of weld lines without affecting the injection molding cycle.

The utility model discloses a communication audio power amplifier noise reduction circuit, and this circuit eliminates environmental low frequency noise through audio threshold detection and noise suppression unit, and the effective human voice frequency band is accurately extracted, and ultrahigh frequency noise is absorbed, through dynamic response optimization unit, the button blasting sound is eliminated, and the speech first letter integrity is guaranteed, through the anti -error trigger unit realizes that the hard limiting of plus or minus 0.7V, constructs two -way voltage clamping and prevents strong interference signal and leads to error trigger, through the power consumption management unit, the power amplifier chip is pulled down to the ground when there is no audio signal, and the standby power consumption of circuit is reduced, through the audio playback unit, the power amplifier control is carried out according to the SPK EN signal outputted by the anti -error trigger unit, and the power amplifier of audio signal is realized and plays. The utility model discloses simple structure, and effective noise reduction is realized through hardware circuit, and the communication quality is improved.

The present invention relates to a method for manufacturing a flexible metal laminated film, and more particularly, to a method for manufacturing flexible metal laminated film for ultra-high frequency to ensure stability between a low-dielectric material and a metal electrode layer.

The application discloses an oil-immersed core reactor oil tank wall surface partial discharge signal measuring point position optimization method, which comprises the following steps: establishing an oil-immersed core reactor simulation model through finite element simulation; researching the distribution characteristics of the reactor ultrahigh frequency electromagnetic wave and ultrasonic wave through electromagnetic field and acoustic field; calculating the frequency spectrum correlation coefficient of each partition signal and the partial discharge source signal through the oil tank surface partition method; and determining the best monitoring point position of the reactor oil tank inner and outer wall surface, thereby laying a foundation for subsequent oil-immersed core reactor state monitoring based on the partial discharge signal characteristics. The application can find the best measuring point of the oil tank wall surface, thereby playing an important role in the oil-immersed core reactor partial discharge signal detection.

The present disclosure relates to a method for preparing a ferrite material, including the following steps: S1: grinding the ferrite particles P1 with grinding balls B1, to obtain the ferrite particles P2, the diameter d90 of the ferrite particles P2 being smaller than the diameter d90 of the particles P1, S1 being carried out at an energy E1 greater than 1.5 kWh / kg; and S2: grinding the ferrite particles P2 with grinding balls B2 to obtain the ferrite particles P3, the diameter d90 of the ferrite particles P3 being smaller than the diameter d90 of the particles P2, S2 being carried out at an energy E2 greater than 5 kWh / kg, and the diameter of the balls B1 being greater than the diameter of the balls B2. The disclosure also relates to a magneto-dielectric ferrite material obtained by such a method, intended for use in the VUHF frequency band.

The invention concerns a glazing, comprising a pane of glass, a conductive coating on a surface of the pane of glass, a data transmission window in or adjacent the conductive coating, wherein the data transmission window is at least partly coating-free, wherein the data transmission window comprises, a rectangular portion having a shorter edge and a longer edge; and a protrusion from the shorter edge or the longer edge, wherein the protrusion comprises an axial portion having an axis parallel with the longer edge. A method for manufacturing the glazing and use of the glazing for example as window of a motor vehicle is also claimed. The invention is suitable for radio frequency identification transponders operating for example in the UHF frequency band.

The application provides a device and method for measuring the ultrahigh frequency ultrasonic acoustic radiation force on an object, wherein the device comprises an elastic force receiving component, an ultrahigh frequency ultrasonic transducer and a displacement measuring device, the elastic force receiving component comprises a glass capillary and an object, the lower end of the glass capillary is a fixed end, the upper end of the glass capillary is a free end, and the object is fixed to the upper end of the glass capillary; the ultrahigh frequency ultrasonic transducer is located on the side of the object, the ultrahigh frequency ultrasonic transducer is used to generate ultrahigh frequency ultrasonic waves according to an excitation signal, and the object moves axially and laterally under the action of axial and lateral ultrasonic acoustic radiation forces; and the displacement measuring device is arranged above the object and is used to measure the axial and lateral displacements of the object under the action of the axial and lateral ultrasonic acoustic radiation forces. The device can be used to simultaneously measure the axial and lateral ultrasonic acoustic radiation forces on the object.

The application provides an external ultrahigh frequency sensor calibration method based on penetration depth optimization, and the method comprises the following steps: obtaining a target parameter of a transformer; determining the installation position of a first ultrahigh frequency sensor through an ideal penetration depth formula; installing a to-be-tested external ultrahigh frequency sensor at the joint of the transformer oil tank; determining a calibration pulse signal injected into the first ultrahigh frequency sensor through a formula; and controlling the to-be-tested external ultrahigh frequency sensor to receive the calibration signal. The application provides an external ultrahigh frequency sensor calibration method suitable for the transformer equipment in a field environment, and improves the accuracy and reliability of field calibration.

A microwave-safe inlay includes an RFID chip, an antenna, and a substrate having special shielding surfaces. These shielding surfaces are arranged in such a manner that they block microwave radiation, while communication in the HF / NFC and UHF range continues to be possible. The inlay is thin, mechanically and thermally durable, and can be used with or without shielding elements to be additionally placed under it. It is particularly intended for use with and integration into reusable microwavable dishes, so as to allow reliable identification and writing and / or reading of additional information, as well.

Conventional RFID antennas using flat patch antennas, when used in the UHF band, experienced a concentration of current at the edges of the antenna pattern due to the skin effect, with almost no current flowing elsewhere. As a result, a strong electromagnetic field was generated at the edges of the antenna pattern, but only a weak electromagnetic field was generated in the center, leading to the problem of poor communication with RFID tags in the center of the antenna. [Solution] An RFID antenna 6 for communicating with an RFID tag, wherein a conductive pattern 25 made of metal foil is arranged on a substrate 21, and the conductive pattern includes meander shapes.

The application discloses a transformer partial discharge positioning method based on photoelectromagnetic signal fusion. The method fuses partial discharge ultrahigh frequency, high frequency current and micro-light three signals, and adaptively selects the optimal positioning strategy through analyzing the ultrahigh frequency preliminary positioning result and the response of different sensors. Specifically, firstly, the arrival time difference method is adopted based on the ultrahigh frequency signal to carry out preliminary positioning, and the three-dimensional model is automatically used to distinguish whether the preliminary discharge point is located inside or outside the winding, and then the multi-end high frequency current positioning or the light-electric combined positioning strategy is selected, and finally, the result is visualized and output in the transformer three-dimensional model. The application can significantly improve the transformer partial discharge positioning precision, and provides a reliable basis for transformer fault diagnosis.

The application provides a kind of acoustic radiation force control method and system of ultra-high frequency ultrasound, comprising: the sound beam of ultra-high frequency ultrasound is aimed at force object;Carrier voltage of pulse signal is set, so that acoustic radiation force reaches preset magnitude;Adjust the pulse width of pulse signal;After adjusting the pulse width, it is judged whether force object satisfies preset driving effect, if yes, end;If not, then fine-tune carrier voltage, and return to adjust pulse width, until force object satisfies preset driving effect.The technical scheme of the application, according to the preset driving effect of force object, carrier voltage and pulse width are adjusted, which can be applied to different driving effects and has wide application range.

The utility model provides a kind of high-pitched horn, including horn body, horn body is in and is set along its length direction communication and overall is the sound wave channel of horn shape, and the small caliber end of sound wave channel is sound inlet, the one end of horn body close to sound wave channel sound inlet is used to connect loudspeaker, it is located in intermediate position and is set along vertical between the left and right side wall of sound wave channel with horizontal first guide solid block, it is also set at least two second guide solid blocks of symmetrically intermediate guide solid block in the left and right side wall of sound wave channel, first guide solid block and each second guide solid block are used to separate sound wave channel into at least four sound transmission channel, the path length that sound wave enters sound wave channel from sound inlet until from each sound transmission channel is transmitted is equal.The high-pitched horn disclosed by the utility model has smooth frequency response characteristics and good ultrahigh frequency extension characteristics.