35 results about "Electromagnetic field" patented technology

A right-hand circularly-polarized patch antenna comprising a ground plane and a patch connected to each other with one or more wires for which the wire shape and location of the end points are selected such that they do not cause an antenna mismatch, and the electrical current carried in the wires produces an extra electromagnetic field subtracted from the patch field in the nadir direction.

An alternating-current electromagnetic field stress measurement system, comprising: an excitation signal generation module, an alternating-current electromagnetic field stress measurement stress probe, a signal amplification circuit, an A / D conversion circuit and a processor, wherein the excitation signal generation module is used for loading a sinusoidal alternating-current signal to an excitation coil of the alternating-current electromagnetic field stress measurement stress probe, such that a periodically changing electric field is generated on a measured magnetic object; the alternating-current electromagnetic field stress measurement stress probe is used for sequentially routing a stress characterization signal, which is detected from the measured magnetic object, through the signal amplification circuit and the A / D conversion circuit, and then sending the stress characterization signal to the processor; and the processor is used for processing the received stress characterization signal by using an optimized J-A model in which an implicit equation originally characterizing a change in the magnetization intensity or magnetic induction intensity along with stress is made explicit, so as to calculate the stress of the measured magnetic object. The alternating-current electromagnetic field stress measurement system can monitor the stress increase trend in real time, and notice potential dangers in time. Further comprised is an alternating-current electromagnetic field stress measurement method and a computer program for executing the alternating-current electromagnetic field stress measurement method.

The invention provides a deep and far sea wind power plant area lightning dynamic parameter inversion method and device, and relates to the technical field of lightning protection, and the method comprises the steps: building a fan return stroke model based on current reflection caused by the wave impedance discontinuity of a fan top, a return stroke channel and a fan bottom grounding position, obtaining an initial propagation model of the electromagnetic field along the sea-land mixed path by combining the surface equivalent impedance of the sea surface and the land of the observation point zone; correcting the initial propagation model through electromagnetic field influence parameters to obtain a target propagation model; inputting a radiation source signal received by an array into the target propagation model for waveform time sequence inversion processing to obtain a corresponding time reversal signal; the time reversal signals in different directions are superposed and focused to obtain the peak azimuth, and the three-dimensional positioning of the lightning radiation source is carried out in combination with the positioning result of the double stations, so that the lightning development spatial-temporal distribution law is determined, and the measurement precision of the lightning leader development speed is remarkably improved.

The invention discloses a Helmholtz coil material lightning magnetic field shielding performance measuring device, which comprises a magnetic field generation device, a shielding test box is arranged in a magnetic field coverage range of the magnetic field generation device, an open hole is formed in the shielding test box, and the open hole enables a magnetic line of force of the magnetic field generation device to transversely penetrate through the shielding test box. The shielding test box is internally provided with the signal measurement unit, the signal measurement unit measures the magnetic field in the shielding test box, the lightning stroke magnetic field environment is accurately simulated, and the repeatability and accuracy of the shielding performance test are improved. The invention further discloses a method for measuring the lightning magnetic field shielding performance of the Helmholtz coil material, the lightning magnetic field shielding performance of the measured shielding material is measured by applying the device for measuring the lightning magnetic field shielding performance of the Helmholtz coil material, and the problem that traditional measurement is poor in accuracy is effectively solved.

The utility model relates to copper wire production technical field, concretely relates to a kind of copper wire production and processing's stretching device, including lubricating bucket and the conveying part for being immersed into the copper wire in lubricating bucket;Electromagnetic rod is located in lubricating bucket, it includes the sealing sleeve coaxially fixed in lubricating bucket and the electromagnetic coil coaxially located in sealing sleeve, for generating strong magnetic field and drive copper powder to the arc-shaped inner wall of lubricating bucket, fishing part is located in lubricating bucket, it includes the fishing ring coaxially slidingly located in lubricating bucket, the outer edge of the fishing ring contacts the inner wall of lubricating bucket.The utility model generates strong electromagnetic field by electromagnetic rod, since copper powder belongs to inverse magnetic material, it generates induced eddy current in alternating magnetic field, and then generates reverse magnetic field, forms repulsion with magnetic field source Lorentz magnetic force and is pushed to low magnetic field area by magnetic repulsion, copper powder can be pushed to the arc-shaped inner wall of lubricating bucket and gathered in real time, greatly extend the period of lubricating liquid cleaning or replacement, reduce its cleaning or replacement frequency.

A method and system for evaluating a cement bond. The method may include disposing a logging tool in a wellbore. The logging tool may include an electromagnetic (EM) sub and an acoustic sub. The method may further comprise transmitting an EM field from the EM sub into one or more tubulars to energize the one or more tubulars with the EM field and measuring a secondary EM field in the one or more tubulars with a EM receive. The method may further comprise transmitting a shaped acoustic signal from the acoustic sub into one or more tubulars and formation, measuring a result signal with the acoustic sub to form one or more acoustic measurements, estimating one or more pipe parameters from the eddy current, and evaluating a cement bond based at least in part on the one or more pipe parameters and the one or more acoustic measurements.

The invention discloses a high-selectivity broadband optical transparent energy selective surface and a control method. The high-selectivity broadband optical transparent energy selective surface comprises a single-layer optical transparent substrate and a parallel circuit structure, the LC series resonance branch is used for forming a fixed stop band in a conventional working state and can form a double-stop-band coupling structure with the field nonlinear device series branch after impedance change under strong electromagnetic attack so as to expand the protection bandwidth, and stable and efficient shielding in the whole target protection frequency band is achieved; and the field-induced nonlinear device series branch is used for performing main shielding and passband adaptive adjustment under strong electromagnetic attack through state switching of the field-induced nonlinear device, that is, the field-induced nonlinear device series branch can change the impedance characteristic under strong electromagnetic field excitation. The LC series branch and the field nonlinear device series branch are integrated on the single-layer light transparent base material, broadband protection performance and low insertion loss which are equivalent to those of a multi-layer or cascade structure are obtained, and meanwhile an extremely small section and a compact structure are achieved.

The invention discloses a nuclear magnetic resonance passive shimming module design method and device based on Gaussian splashing, and relates to the technical field of precision electromagnetic field optimizing.The nuclear magnetic resonance passive shimming module design method comprises the steps that initialization is conducted in a design domain of a passive shimming module, and an initial parameter set of all Gaussian splashing particles is obtained; constructing a mapping relation between the equivalent magnetic moment and the magnetization weight factor of each Gaussian splashing particle and between the intrinsic magnetization intensity and the scaling vector of the magnetic material, and constructing a magnetic field intensity calculation model; inputting the initial parameter set of all Gaussian splashing particles and the real magnetic field intensity into a Gaussian splashing particle parameter set iterative optimization algorithm, and calculating and predicting the magnetic field intensity through a magnetic field intensity calculation model; and based on the predicted magnetic field intensity, the real magnetic field intensity, the magnetization weight factor vector and the center position vector, constructing a multi-objective loss function and performing iterative optimization to obtain an optimized parameter set and manufacture a passive shimming module. The method solves the problem of low precision and efficiency of compensating a magnetic field with a complex shape.

The present application relates to a kind of wave frequency energy emission devices, the device includes: electromagnetic modulation layer, for modulating preset frequency and power electric signal pulse, and change magnetic field is generated according to the electric signal pulse;Energy conversion layer is arranged in the magnetic field range of the change magnetic field, and the energy conversion layer is used to convert the magnetic field energy of the change magnetic field into vibration energy wave;The energy conversion layer is composed of one or two kinds of strain materials, and the expansion rate and response time of each strain material are different;The vibration energy wave is used to cause the resonance inside target object, to change the state of the target object.The present application utilizes the characteristics that the energy conversion layer generates expansion with the change of electromagnetic field, causes vibration, thereby converts into high-frequency vibration wave, thereby improves the efficiency and effect of energy output.

The invention provides an electromagnetic field visualization measurement method and device and electronic equipment, and the method comprises the steps: controlling an electromagnetic field measurement probe to move on a to-be-measured plane at a preset distance from a to-be-measured object in a preset track, and detecting the real-time electromagnetic field data; acquiring images of the to-be-measured object and the electromagnetic field measuring probe through a camera; identifying image features of the electromagnetic field measurement probe in the image; determining position data of the electromagnetic field measuring probe in the image according to image features of the electromagnetic field measuring probe; determining a target color corresponding to the real-time electromagnetic field data according to a mapping relationship between the real-time electromagnetic field data and a preset color; and overlapping the real-time electromagnetic field data and the pixel color blocks with target colors and transparency on the image according to the target position data of the electromagnetic field measurement probe corresponding to the real-time electromagnetic field data for displaying. According to the method, efficient cooperation of electromagnetic field measurement and display is realized, the measurement efficiency is remarkably improved, and the method supports flexible adaptation to different scene requirements.

This invention relates to the field of magnetic pole topology design, and more particularly to a method for designing the magnetic pole topology of a finite-angle torque electromagnetic drive. The method includes: meshing the rotor back iron, air gap, and stator domain of a finite-angle torque motor; defining permanent magnet material variables and soft magnetic material variables; based on the material variables, performing filtering, projection, and constitutive equation electromagnetic field mapping through an electromagnetic field finite element model to generate mapped material variables and torque variables; constructing constraints and an objective function; and solving the magnetic field strength characterization variables of the objective function using an optimization solver to determine the optimal combination of the corresponding permanent magnet material variables and soft magnetic material variables. This invention transforms the distribution problem of permanent magnets and soft magnetic materials in the rotor back iron into a topology optimization problem, achieving a high-performance combination of permanent and soft magnetic materials, improving the material utilization rate and torque density of both permanent and soft magnets, and realizing high material utilization of the rotor back iron of a finite-angle torque motor.

Head-mounted augmented reality (AR) devices can track pose of a wearer's head to provide a three-dimensional virtual representation of objects in the wearer's environment. An electromagnetic (EM) tracking system can track head or body pose. A handheld user input device can include an EM emitter that generates an EM field, and the head-mounted AR device can include an EM sensor that senses the EM field. EM information from the sensor can be analyzed to determine location and / or orientation of the sensor and thereby the wearer's pose. The EM emitter and sensor may utilize time division multiplexing (TDM) or dynamic frequency tuning to operate at multiple frequencies. Voltage gain control may be implemented in the transmitter, rather than the sensor, allowing smaller and lighter weight sensor designs. The EM sensor can implement noise cancellation to reduce the level of EM interference generated by nearby audio speakers.

The present application relates to the technical field of particle detection, and provides a non-blocking beam three-dimensional profile measuring device and a measuring method thereof, wherein the internal structure of a measuring main body has a first chamber and a second chamber, a first slit is arranged between the first chamber and the second chamber, and a second slit is arranged on the bottom wall of the second chamber; a beam inlet channel and a beam outlet channel are arranged in the measuring main body in a penetrating manner, and the beam inlet channel and the beam outlet channel are both communicated with the first chamber; an electrostatic magnetic field assembly is arranged in the first chamber; a radio frequency deflection assembly is arranged in the second chamber, and the radio frequency deflection assembly forms a radio frequency electric field; a beam profile measuring component is used for multiplying and amplifying signal electrons, and the signal electrons are captured by an imaging detector after electric-optical conversion, so that the beam profile is measured; a beam bunch length measuring component is arranged on the measuring main body and located below the position of the second slit, and is used for multiplying and amplifying signal electrons and I-V conversion, and cooperates with radio frequency power sweep phase to realize beam bunch length measurement.

The application provides a polishing device and method for a micro resonator by using a photocatalytic fluid energy field, which comprises a machine tool and a spindle system, a control system, a magnetic field system and a photocatalytic system arranged on the machine tool, the output end of the spindle system is connected with a fixed resonator device disc, a plurality of closed light-transmitting core shells for clamping workpieces to be polished are arranged on the fixed resonator device disc, and polishing liquid with magnetic abrasive particles is arranged in the closed light-transmitting core shells, an electromagnetic field is formed in the closed light-transmitting core shells during processing, and the photocatalytic system is arranged in the space above the spindle system and is used for assisting the polishing of the workpieces to be polished through photocatalysis. The application successfully solves the technical problems of low polishing efficiency and poor surface quality of the inner and outer spherical surfaces of the micro resonator and realizes the ultra-precision polishing of the micro resonator.

The invention relates to a device for measuring the electromagnetic radiation of a radiating object (10), comprising: a sealed box (20) housing said radiating object (10); means (12) for moving said radiating object (10) in a longitudinal direction (L); a heat-sensitive film (14) housed in said box (20); a camera (16) housed at a longitudinal end of said sealed box (20), opposite said radiating object (10) to be measured relative to the heat-sensitive film (14), and configured to acquire images of said heat-sensitive film; means (18) for processing said images configured to provide a map of the electromagnetic field of said radiating object (10) picked up by said heat-sensitive film (4).

A method and system for evaluating a cement bond. The method may include disposing a logging tool in a wellbore. The logging tool may include an electromagnetic (EM) sub and an acoustic sub. The method may further comprise transmitting an EM field from the EM sub into one or more tubulars to energize the one or more tubulars with the EM field and measuring a secondary EM field in the one or more tubulars with a EM receive. The method may further comprise transmitting a shaped acoustic signal from the acoustic sub into one or more tubulars and formation, measuring a result signal with the acoustic sub to form one or more acoustic measurements, estimating one or more pipe parameters from the eddy current, and evaluating a cement bond based at least in part on the one or more pipe parameters and the one or more acoustic measurements.

The invention discloses an electromagnetic field assisted low-temperature storage and preservation method for figs, and belongs to the technical field of storage and preservation of fruits. Comprising the following steps: picking figs from trees, screening the figs, and pre-cooling the figs in a refrigerator at the temperature of 1 DEG C; then the precooled figs are placed in a magnetoelectric coupling freezing and refrigerating box, and electric field treatment with the electric field intensity being 30 kV / cm, magnetic field treatment with the magnetic field intensity being 8 mT and combined treatment with the electric field intensity being 30 kV / cm and the magnetic field intensity being 8 mT are adopted; setting two treatment time of 30 minutes and 60 minutes under each treatment condition, and finally putting the figs treated by the electromagnetic field into a refrigeration house at the temperature of 1 DEG C for storage. According to the method, electromagnetic field treatment and low-temperature storage technologies are combined, the preservation period of the figs can be effectively prolonged, nutritional ingredients and good quality of the fruits are kept, and the method has a remarkable preservation effect and a wide application prospect.

Portable self-standing electromagnetic (EM) field sensing locator systems with attachments for finding and mapping buried objects such as utilities and with intuitive graphical user interface (GUI) displays are described. Accessories may include a ground penetrating radar (GPR) system with a rotating Tx / Rx antenna assembly, a leak detection system, a multi-probe voltage mapping system, a man-portable laser-range finder system with embedded dipole beacon, and other detachable accessory sensor systems are accepted for attachment to the locator system for simultaneous operation in cooperation with the basic locator system. The integration of the locator system with one or mom additional devices, such as fault-finding, geophones and conductance sensors, may be used to facilitate the rapid detection and localization of many different types of buried objects.

This invention relates to an electromagnetic field scanning system for diamond NV centers based on heterodyne detection, belonging to the field of microwave quantum detection technology. It includes a laser pumping module, a fluorescence collection module, a microwave pumping module, a magnetic field control module, and a scanning detection module. The laser pumping module generates a laser to excite the diamond NV centers to emit fluorescence signals. The microwave pumping module generates an injection microwave signal and a reference microwave signal with similar frequencies. The injection microwave signal is injected into the microwave radiation device under test to generate the microwave signal to be measured. The reference microwave signal and the microwave signal to be measured generate a heterodyne mixing signal. The magnetic field control module applies a static magnetic field to the diamond, enabling the diamond NV centers to resonate with the microwave signal to be measured and emit fluorescence response signals. The fluorescence collection module collects the fluorescence signal and obtains the spectrum, which is sent to the control unit. The control unit calculates the microwave signal to be measured based on the spectrum information. This invention solves the problem of the lack of a system solution for applying heterodyne detection to the detection of diamond NV centers in the prior art.

The application discloses a surgical navigation system, comprising: a magnetic field generator for generating an electromagnetic field; a plurality of electromagnetic locators fixed on a target object, the electromagnetic locators for generating induced current or induced voltage under the electromagnetic field; a controller for acquiring a medical image obtained by shooting the target object on which the plurality of electromagnetic locators are fixed, and determining a conversion matrix between an image coordinate system of the medical image and a locator coordinate system of each electromagnetic locator according to a first position coordinate of each electromagnetic locator in the medical image and a pose of each electromagnetic locator when the medical image is shot, the pose of the electromagnetic locator being determined based on the induced current or induced voltage generated by the electromagnetic locator under the electromagnetic field; the controller is further used for acquiring a real-time pose of the electromagnetic locator, fusing the real-time pose with the medical image according to the conversion matrix and displaying a fusion result, and realizing surgical navigation.

The invention discloses an induced magnetic field carrier integration device and a method for changing physicochemical properties of a liquid sample. The induced magnetic field carrier integration device comprises a magnetic coupling integration assembly which comprises N magnetic ring inductance coils, the N magnetic ring inductance coils are combined into one or more magnetic ring inductance coil groups, and M magnetic ring inductance coils included in the magnetic ring inductance coil groups are sequentially arranged along a selected track, windows of M magnetic ring inductance coils included in the magnetic ring inductance coil group are communicated in sequence to form a hollow structure; one part of the sample placing pipe is arranged in the hollow structure of the magnetic coupling integrated assembly, the medium-frequency induced magnetic field can induce to generate an induced electric / magnetic field in a liquid sample in the sample placing pipe, and M is greater than or equal to 2 and less than or equal to N. Through the special design of the structure integration of the magnetic coupling integrated assembly, efficient magnetoelectric coupling treatment on the sample is obtained, the sample has an induced magnetic field and an induced electric field at the same time, the active power is improved, the heat dissipation power is reduced, and in other words, the eddy current loss is remarkably reduced.

The utility model discloses an electric heating tube of a high-power water heater, which comprises a first electric heating tube body, a second electric heating tube body, a flange plate, a wiring board and a temperature detection tube, the first electric heating pipe body comprises a spiral heating section, a first vertical heating section, a first inclined heating section and a first electric heating pipe body fixing section which are connected in sequence; the second electric heating pipe body comprises a bent heating section, a second vertical heating section, a second inclined heating section and a second electric heating pipe body fixing section which are connected in sequence; a first electric heating pipe body composed of a spiral heating section, a first vertical heating section, a first inclined heating section and a first electric heating pipe body fixing section is matched with a second electric heating pipe body composed of a bent heating section, a second vertical heating section, a second inclined heating section and a second electric heating pipe body fixing section to form a three-dimensional heating network. And in addition, the three-dimensional layout enables the electromagnetic field to be uniformly distributed, and the conversion efficiency of converting electric energy into heat energy is improved.

This invention discloses a design method and apparatus for nuclear magnetic resonance shimming coils based on Gaussian splashing, belonging to the field of precision electromagnetic field optimization technology. The method includes: inputting an initial parameter set of all Gaussian particles and the target magnetic field strength at each sampling point on the current-carrying surface into an iterative optimization algorithm for the Gaussian particle parameter set; obtaining the predicted magnetic field strength at each sampling point on the current-carrying surface based on the parameter set obtained in the previous iteration using a magnetic field strength calculation model; constructing a multi-objective loss function based on the deviation between the predicted and target magnetic field strengths, the stream function weighting factor vector, and the center position vector; updating the parameter set obtained in the previous iteration to obtain the parameter set for the current iteration; repeating the above iterative optimization process until the maximum number of iterations is reached; outputting the optimized parameter set and fabricating the resulting shimming coil. This invention solves the problem of low accuracy and efficiency of current shimming coils when generating magnetic fields with complex shapes.

The object of the invention is to create a system capable of controlling the nuclear process and coherent nuclear fusion during initiation and evolution of a self-coordinating electromagnetically constrained explosive implosion mode. The claimed system is capable of controlling the implosion pattern in the agglomerated material of the pellet and of the medium surrounding the pellet. It also has a specially shaped multi-component plasma electrode that ensures effective beam focusing. It allows the environment around the electrode to be controlled, which ensures a high value of the beam volume charge parameter in the pellet for a sufficiently long time interval. Further, it is formed using plasma with certain non-uniformity and non-stability in the focal region of the electron beam, which provides an impact sufficient to alter the direction of energy of the process. Furthermore, it contains an electromagnetic field source having a specific ring topology and a high proportional radial component to control the coulomb barrier value and the internal structure of the nuclei of the reactor pellet fuel. In addition, it has means for converting the kinetic energy and electromagnetic radiation of the fusion product in a wide energy range into electrical and thermal energy.

The invention discloses a thrust pad drawing device, and relates to the technical field of generator maintenance. Comprising a mounting unit which comprises a circumferential inner rail, a circumferential outer rail arranged on the outer side of the circumferential inner rail and a splicing assembly arranged on the circumferential inner rail and the circumferential outer rail; the tile drawing unit comprises a radial sliding rail and a sliding assembly which is arranged on the radial sliding rail and matched with the circumferential inner rail and the circumferential outer rail; the rail transfer unit comprises rail transfer grooves formed in the radial sliding rail, the circumferential inner rail and the circumferential outer rail. According to the mechanism, the transmission unit is arranged, the sliding assembly and the adjusting assembly can be matched with each other, the electromagnetic field direction of the supporting plate is opposite to the magnetic field force direction of the sliding rail, the magnetic field forces repel each other, the pushing plate can move along the rail through gentle pushing, the manpower burden is relieved, and the overhauling efficiency is improved; a plurality of circumferential rails can be mounted according to the position change of the thrust pad, so that the flexibility of the device is improved.

Methods, apparatus, devices, and systems for displaying objects in three dimensions (3D) are provided. In one aspect, a method includes: obtaining data including corresponding primitive data of primitives corresponding to the object; determining the electromagnetic field contribution of the primitives to the display elements by calculating the electromagnetic field propagation from each primitive to each display element of the display screen; generating a sum of electromagnetic field contributions of a plurality of the primitives to each display element; sending a corresponding control signal to each display element to modulate at least one characteristic of the display element based on the sum of electromagnetic field contributions; and sending a timing control signal to an illuminator to activate the illuminator thereby illuminating light onto the display screen, such that the modulated display elements of the display screen cause the light to form a volumetric light field corresponding to the object.

To provide methods, apparatuses, devices, and systems for three dimensional (3D) display of objects.SOLUTION: In one aspect, a method includes obtaining data including respective primitive data for primitives corresponding to an object, determining, for each of the primitives, an electromagnetic (EM) field contribution to each element of a display by computing a propagation of the EM field from the primitive to the element, generating, for each of the elements, a sum of the EM field contributions from the primitives, sending respective control signals to each of the elements to modulate at least one characteristic of the elements based on the sum of the EM field contributions, and sending timed control signals to light emitters to activate the light emitters to illuminate the display such that light is produced by the modulating elements of the display to form a volumetric light field corresponding to the object.SELECTED DRAWING: Figure 4

The application discloses a dynamic adjustable magnetic field focusing method and system based on a phased current element array, and relates to the technical field of electromagnetic field control. The method comprises the following steps: based on a target focusing position, performing phase calibration on each current element in the current element array to obtain a phase compensation value of each current element, wherein the current element array comprises a plurality of current elements; based on the phase compensation value of each current element, determining an excitation signal of each current element; and based on the phase compensation value of each current element and the excitation signal of each current element, dynamically adjusting a phase term of each target point to enable the adjusted magnetic field to focus on the target focusing position, wherein the target point is a target point in the magnetic field generated by the current element array. According to the electromagnetic wave interference theory and the magnetic vector superposition principle, a dynamic focusing algorithm is constructed, the phase and amplitude of the excitation signal are adjusted in real time, the array unit is driven to generate a coherent superimposed magnetic field, and high magnetic field energy dynamic focusing is realized at the target position.