851 results about "Receiver coil" patented technology

The invention discloses an underground space time-shifting transient electromagnetic unmanned monitoring device and method. The underground space time-shifting transient electromagnetic unmanned monitoring device comprises a mobile platform, a multifunctional transient electromagnetic detection device and a ground remote control terminal, the multifunctional transient electromagnetic detection device can actively adjust the distance between a transmitting coil and a receiving coil so as to realize a mutual inductance eliminating 8-shaped coil structure, and through cooperation with a calibration algorithm of a control center, the automation level and reliability of detection are remarkably improved, and it is ensured that the 8-shaped coil is in a mutual inductance eliminating state. In addition, the transient electromagnetic monitoring device can perform structure switching between deep layer detection and shallow layer detection, so that a high-efficiency detection mode that one circle has two purposes is realized, and the efficiency and the flexibility of detection operation are remarkably improved. In the actual detection process, the advantages that the 8-shaped coil is small in shallow blind area and large in overlapped loop detection depth are fully played, advantage complementation of two coil modes is achieved, and comprehensiveness and accuracy of a detection result are remarkably improved through a data fusion mode.

The invention discloses a single-load wireless power transmission system with single transmitting and double receiving coils and a method thereof. The system comprises a direct-current power supply, a high-frequency inverter, a transmitting end compensation topology module, a transmitting coil module, two receiving coil modules, two receiving end compensation topology modules, a rectifier module, a filter capacitor and a system load module. The topological structure adopts S-LC and S-LCC compensation topology, and a topological structure parameter optimization method is provided, so that the anti-offset characteristic of the system is effectively improved. The optimized system can realize the stability of the output power of the system under the working conditions of offset and load change within a certain range. According to the system, the cost of the system is reduced, the high anti-offset capability can be achieved, the output power is stable, and the overall efficiency of the system is improved.

The invention belongs to the technical field of magnetic particle imaging, particularly relates to a magnetic particle imaging system and method based on a flexible receiving coil array, and aims to solve the problems that an existing rigid receiving coil is poor in biological surface adaptability and low in signal-to-noise ratio for micro geometric texture imaging. According to the structure, a receiving coil array adheres to the surface of an object to be measured, the receiving coil array and a compensation coil array are distributed on the two sides of a flexible substrate, the receiving coil array is used for receiving magnetic nanoparticle signals, and the partitioned small compensation coil array is used for conducting feed-through interference and electromagnetic interference compensation on a receiving coil; the reconstruction method comprises the following steps: sequentially carrying out Fourier transform on the collected receiving signals, extracting in-phase third harmonics and superposing to obtain processed signals, interpolating to construct a sinogram for Cartesian coordinate distribution, and reconstructing the three-dimensional particle concentration distribution of a measured object by a filtering back projection method. A flexible receiving coil array strategy is adopted, an adaptive reconstruction method is provided, and the imaging signal-to-noise ratio is improved.

The invention is suitable for the technical field of grounding grid defect evaluation, and provides a transient electromagnetism-based grounding grid corrosion defect evaluation method and system, and the method comprises the steps: placing a sensor of a transient electromagnetic detection device above a to-be-detected region of a grounding grid, injecting a pulse current excitation signal into a conical focusing excitation coil, and carrying out the detection of the to-be-detected region of the grounding grid; acquiring an induced voltage time sequence signal through a receiving coil; extracting at least one characteristic parameter from the induced voltage time sequence signal, wherein the characteristic parameter comprises a signal peak value, peak value time, an attenuation rate or a signal integral quantity; inputting the characteristic parameters into a preset corrosion evaluation model, and performing inversion to obtain a residual thickness value or a corrosion depth value of the grounding grid in the to-be-detected area; generating and outputting a quantitative evaluation result containing the residual thickness value or the corrosion depth value; the method can be implemented in a non-stop state of the grounding grid, and an efficient and reliable decision basis is provided for safe operation and state maintenance of a power system.

The invention discloses a power supply system of vehicle window glass and a vehicle, and relates to the technical field of vehicles. The power supply system comprises a wireless charging receiving coil pre-buried in vehicle window glass, a wireless charging transmitting coil installed on a vehicle to which the vehicle window glass belongs, and an integrated circuit board installed in the vehicle window glass and connected with the wireless charging receiving coil. The wireless charging transmitting coil is connected with a low-voltage power supply circuit in the vehicle; the low-voltage power supply circuit is used for providing electric energy for the wireless charging transmitting coil, so that the wireless charging transmitting coil generates a changed magnetic field and transmits the magnetic field to the wireless charging receiving coil; the wireless charging receiving coil induces a changing magnetic field through the electromagnetic induction principle and then generates induction current to charge a battery in the integrated circuit board. Electric energy wireless transmission is realized through an electromagnetic induction principle between the wireless charging transmitting coil and the receiving coil, so that the vehicle window glass can receive electric energy without physical connection, and wireless power supply of the vehicle window glass is realized.

The present invention discloses a wireless ultrasonic measurement system and a construction method thereof, wherein the measurement system includes a sensing module and a detection module; the sensing module includes a piezoelectric layer on the surface of the detection object, a first lead-out electrode structure, a first grounding electrode structure, a first insulating plate, and a sensing coil; the first insulating plate is provided with a first opening; the first lead-out electrode structure includes a first lead-out electrode on the top of the piezoelectric layer and a second lead-out electrode in the first opening; the first grounding electrode structure includes a first grounding electrode and a second grounding electrode; the second lead-out electrode and the second grounding electrode are respectively connected to the first lead-out electrode and the first grounding electrode; the sensing coil is provided at the top of the first insulating plate. The detection system of the present invention uses an insulating plate to isolate the sensing coil away from the surface of the detection object, which is conducive to the sensing coil generating a non-zero induced voltage U ind , thereby enhancing the signal of the receiving coil, and realizing contactless ultrasonic signal reception with a receiving distance of up to 20mm.

The invention discloses a liquid metal electromagnetic flowmeter capable of eliminating the influence of an environmental magnetic field and a use method. The flowmeter comprises a flow channel, a magnet exciting coil, a first environment magnetic field eliminating coil, a second environment magnetic field eliminating coil, a first signal receiving coil, a second signal receiving coil and a measuring device. Induced electromotive forces generated by an environment magnetic field on the four induction coils are equal, and the electromotive forces of the elimination coil and the signal receiving coil are superposed and counteracted through a specific connection mode, so that the influence of the environment magnetic field is reduced, and the signal-to-noise ratio is improved. When the flow needs to be measured, firstly measuring the phase difference, then adjusting the frequency to determine the working frequency, obtaining the relationship between the flow velocity and the phase difference, inputting the relational expression, finally measuring the phase difference, performing interpolation calculation to obtain the flow velocity, and calculating the volume and mass flow by combining the geometric parameters of the flow channel and the liquid metal density. The device and the method have the advantages of wide measurement range, high precision, strong applicability and the like, are suitable for various environmental magnetic fields and flow channel sizes, are higher in measurement precision and are stable, and measurement signals are not influenced by corrosion of working media.

The invention aims to provide an aircraft blade detection probe and method based on flexible double-frequency differential eddy current, and relates to the technical field of nondestructive testing, when defect detection of an aircraft blade is carried out, a flexible substrate can be adaptively attached to a complex curved surface of the blade; the double-frequency excitation coil cooperatively works through high frequency and low frequency and respectively captures surface micro-cracks and subsurface corrosion defects, and when differential signal amplitude fluctuation occurs in the differential receiving coil, it can be judged that abnormal damage exists in a corresponding blade area; if the coil induction signal is kept stable and unchanged, the corresponding area is in a normal state, and the geometric characteristics of the damaged part can be quantitatively analyzed by observing the numerical range of the amplitude change; specifically, the intensity of signals output by the induction lines and the integrity of the blade structure are in positive correlation, and the larger the fluctuation value is, the more serious the damage degree is.

The invention discloses a semi-aviation transient electromagnetic signal adaptive gain method and system, and relates to the technical field of geophysical exploration, and the method comprises the steps: obtaining a differential signal of a receiving coil, and carrying out the chopping self-stabilization zero amplification processing of the differential signal; the method comprises the following steps: dividing a total time window of a differential signal into a plurality of time channels under a set time reference, adjusting the length of each time channel according to a signal attenuation characteristic, calculating the time length and data point number of each time channel according to a sampling rate and the total time window, and calculating the time length and data point number of each time channel; the data points are distributed to an early time channel, a middle time channel and a late time channel, so that different gain multiples are switched, and adaptive gain amplification is carried out; and the differential signal subjected to adaptive gain amplification is transmitted to a receiver after being collected by an ADC (Analog to Digital Converter). By dynamically adjusting the gain coefficient in different time channels, the technical problems of large dynamic range of transient electromagnetic signals and low signal-to-noise ratio of weak signals are solved, and high-fidelity acquisition of full-time-domain signals is realized.

The invention discloses a control circuit and method for a three-phase wireless power transmission system to supply power to a single-phase load. The method comprises the following steps: setting the frequency, amplitude and electrical angle of a three-phase voltage; determining the input voltage of the direct-current power supply; a proportional resonance (PR) controller is used for processing input voltage of a direct-current power supply and three-phase instantaneous voltage input by a transmitting and receiving coil module, and control signals are obtained after processing; inputting the control signal into a three-phase high-frequency inverter and a modulation circuit module to generate a square wave signal conforming to a set three-phase voltage phase; inputting the square wave signal into a resonance compensation module to generate a three-phase sinusoidal voltage wave which is the same as the set three-phase voltage; the three-phase sinusoidal voltage wave is subjected to wireless electric energy transmission through the transmitting and receiving coil module to obtain a corresponding square wave signal; corresponding square wave signals are converted into sinusoidal voltage waves through the rectifying and filtering module and are transmitted to a system load. According to the invention, the transmission power of the three-phase wireless power transmission system can be improved.

The invention discloses an air-ground cooperative excitation integrated time-frequency receiving aviation electromagnetic detection system and method, and belongs to the technical field of aviation geophysical detection. The electromagnetic detection system comprises a time frequency receiver, a helicopter aviation time domain transmitter, a time frequency receiving coil and a ground frequency domain transmitter. According to the electromagnetic detection method, time-domain pulses are transmitted in the air through the helicopter, frequency-domain continuous waves are transmitted on the ground, the time-domain pulses and the frequency-domain continuous waves are excited synchronously and received in a full-aviation mode, and helicopter aviation time-domain electromagnetic data and ground-air frequency-domain electromagnetic data are obtained through one-time flight based on the frequency point splitting and data decoupling technology. The electromagnetic detection system integrates the high-resolution imaging capability of helicopter aviation time domain electromagnetism to a hectometer-level shallow part and the strong penetration characteristic of ground-air frequency domain electromagnetism to a deep part, and is particularly suitable for large-range resource exploration under complex surface conditions such as mountainous areas and water areas; the method can realize shallow geologic structure refining considering large-depth geologic structure detection.

The invention belongs to the technical field of gap measurement, and particularly relates to a high-temperature-resistant transparent shell type eddy current tip gap measuring device and method, and the device comprises a sensor probe module, a signal conditioning module, a data collection module and a data processing module. The sensor probe module is mounted on the outer wall of the casing; the sensor probe module comprises a permanent magnet excitation source, a soft magnet magnetic core and a receiving coil; the signal conditioning module is electrically connected with the receiving coil and is used for amplifying, filtering and integrating the weak induction signal; the data acquisition module is electrically connected with the signal conditioning module and converts an analog signal into a digital signal; the data processing module is used for processing the acquired digital signals and extracting blade tip clearance information.

The invention discloses a dynamic environment parameter sensing and self-adaptive information pushing system and method fused with the near field communication technology, and relates to the field of information pushing.The system comprises a terminal, an acquisition end and a cloud server, the radio frequency energy conversion unit comprises a near field communication chip and a radio frequency receiving coil, and the radio frequency receiving coil is coupled with the input end of the near field communication chip and used for capturing radio frequency energy through electromagnetic induction; the near field communication chip is used for storing and sending data information. The system is based on multi-dimensional data, and realizes pushing of different information and data under different scenes, positions and time.

The invention belongs to the technical field of underwater wireless charging, and particularly relates to an underwater robot wireless charging position autonomous matching method, a charging module and a system, and the method comprises the steps: obtaining the operation information of a target AUV through a position recognition unit, and the operation information comprises the horizontal offset, the vertical depth, the azimuth angle, the dynamic track, the water salinity, the temperature and the turbidity; a vector propeller of the wireless charging system is controlled to sail near the target AUV, and the real-time distance and pose deviation between the AUV and a receiving coil are calculated through visual information of a camera and magnetic field change data of a magnetic coupler; and generating a waypoint sequence based on a PID control algorithm, and adjusting the space six-degree-of-freedom motion of the propeller to enable the charging module to move to a preset attitude angle. Through designed hardware circuits of the power driving unit and the position identification unit, a communication protocol in a control system and a control algorithm, information of the position identification unit is acquired and processed, a propeller is controlled to carry out accurate matching, and autonomous matching of the position of the AUV wireless charging system is realized.

The invention belongs to the technical field of pulsed eddy current detection, and particularly discloses a co-excitation type pulsed eddy current thickness measurement and flaw detection composite sensor. The sensor comprises a shell, and the shell is internally provided with an excitation coil used for exciting a pulsed eddy current magnetic field in a measured object; the absolute receiving coil coaxially sleeves the peripheral surface of the excitation coil and is used for sensing the pulsed eddy current magnetic field and outputting a thickness measuring signal for reflecting the thickness change of the measured object; the differential receiving coil comprises two sub-coils which are respectively arranged at the two radial ends of the absolute receiving coil, and the dotted terminals of the two sub-coils are connected and jointly used for sensing a pulsed eddy current magnetic field and outputting defect signals for reflecting defects of a detected object. According to the sensor, thickness measurement and flaw detection can be carried out on a detected object at the same time, and the detection sensitivity is extremely high.

The invention discloses a seabed dipole-dipole electromagnetic detection system and method carried on a remote control underwater robot, and belongs to the technical field of seabed metal mineral resource fine exploration. The system comprises a remote control underwater robot (ROV), a retractable receiving coil extension bracket, a transient electromagnetic transmitting coil, a transient electromagnetic receiving coil, a transient electromagnetic main engine room and an instrument fixing bracket. The extension bracket is controlled through the hydraulic retraction device, so that the receiving coil is arranged away from the ROV body, and the interference of the equipment body on electromagnetic signals is obviously reduced. The ROV performs low-altitude cruising on the seabed along a preset fine measuring line to acquire transient electromagnetic data, and the actually measured data is corrected in real time by using the full-space seawater environment response in the diving process, so that the system interference is effectively inhibited. According to the method, the high-resolution electromagnetic detection capability of ore bodies such as seabed polymetallic sulfide is improved, and the method is suitable for mineral resource investigation of complex terrains and small-scale regions.

A wireless charging receive end, system, and control method related to the field of wireless charging technologies are provided. The wireless charging receive end includes a receiver coil, a compensation network, a power converter, and a receive end controller. The receiver coil converts an alternating magnetic field transmitted by a transmit end into an alternating current and transmits the alternating current to the compensation network. The compensation network compensates for the alternating current and then transmit a compensated alternating current to the power converter. The power converter rectifies the compensated alternating current into a direct current for charging a load. The receive end controller obtains a reference signal based on an input current of the power converter and an input reference current, and sends the reference signal to a transmit end controller.

The invention relates to the technical field of geophysical exploration, in particular to a semi-aviation transient electromagnetic detection system based on cooperation of a robot dog and an unmanned aerial vehicle, and the system consists of a robot dog platform, an unmanned aerial vehicle platform and a ground control station. The robot dog platform comprises a high-power transient electromagnetic transmitter, a line source laying module, a voice warning module and a mobile positioning module, and can automatically lay a line source and inject pulse current to the ground; the unmanned aerial vehicle platform comprises a visual field auxiliary module, a flight driving module and a receiving coil, and the coil can be dragged according to a preset route to collect electromagnetic data; the ground control station is used for job scheduling and data processing. Wiring-transmitting-receiving integrated collaborative operation is realized through the robot dog and the unmanned aerial vehicle, and the robot is suitable for detection of a complex mountain environment.

The present invention discloses a fully wireless ocular surface pressure monitoring system based on a multi-frequency phase-shift decoupling self-calibration algorithm, relating to the technical field of intelligent ophthalmic detection. The system comprises a wearable three-layer contact lens, wherein the outer layer is embedded with a capacitive eyelid pressure sensor and a first spiral coil, and the inner layer is embedded with a piezoresistive intraocular pressure sensor and a second spiral coil, which are respectively tuned to different center frequencies to modulate pressure changes into radio frequency signals. Externally powered receiving glasses or eye masks comprise a multi-frequency transmitting coil, a rectifier circuit and a receiving coil, which supply energy to the sensing structure in the contact lens and sense and obtain a composite signal formed by spatial superposition, which is transmitted to a processing circuit and then sent to a mobile computing terminal. The terminal performs multi-frequency decoupling, sparse matrix separation and temporal self-calibration processing to generate calibration curves of eyelid pressure and intraocular pressure, thereby realizing real-time perception of dual parameters in the eyes-closed state. The system has the advantages of compact structure, high signal separation accuracy and high degree of wirelessness.

The objective of the present invention is to achieve downsizing of a power-receiving coil unit including a power-receiving coil.　A power-receiving coil unit (60) comprises: a first power-receiving coil (34a); a ferromagnetic first core member (65) having a first base part (65b) and a core part (65a) that protrudes to one side of the first base part and passes through the first power-receiving coil; a substrate (66) disposed on the other side of the first base part; and a transformer in which a primary-side coil is configured by wiring formed on the substrate. The first core member constitutes a part of the transformer core.

In an embodiment, an apparatus for charging an electric vehicle, can include a receptacle mountable to a structure above the electric vehicle. The receptacle can maintain a charge transmitting device, which can be automatically moveable and directable from the receptacle toward a target area on the electric vehicle associated with a receiving coil mounted on the electric vehicle for the charging of an electric vehicle when the one receiving coil engages with the charge transmitting device when the electric vehicle is located below the receptacle. One or more optical sensors can be utilized to direct the charge transmitting device toward the target.

The invention discloses an underwater vehicle wireless electric energy transmission system with an omnidirectional anti-offset function. The transmission system comprises a magnetic coupler receiving assembly and a magnetic coupler sending assembly. The sending assembly is used for providing a charging magnetic field for the receiving assembly. The magnetic coupler transmitting assembly comprises a stepped coil and an anti-series coil, and the stepped coil is located in the anti-series coil; the magnetic coupler receiving assembly comprises a plurality of receiving coils, magnetic cores are arranged in the receiving coils, and the receiving coils are of solenoid structures and are wound around the magnetic cores; the number of the receiving coils is five, one receiving coil is arranged in the middle of the H shape, and the other four receiving coils are fixed to the ends of the H shape. According to the invention, the magnetic field intensity of the surrounding area of the wireless electric energy transmission system is improved, and the mutual inductance between the transmitting coil and the receiving coil is ensured to be stable when the omnidirectional position offset of the aircraft occurs.

The invention relates to a radio frequency coil assembly suitable for a magnetic resonance system, the magnetic resonance system and a control method. The radio frequency coil assembly comprises a coil body formed by arranging a plurality of coil units, and the mode switching circuit is connected with at least one coil unit and used for controlling the coil unit to be switched from a transmitting mode to a receiving mode or from the receiving mode to the transmitting mode. The mode switching circuit is arranged between the radio frequency power amplifier and the coil unit, the pre-amplifier is used for amplifying magnetic resonance signals received by the coil unit, and the matching circuit is arranged between the mode switching circuit and the pre-amplifier and is used for realizing power matching between the radio frequency power amplifier and the coil unit or realizing noise matching between the coil unit and the pre-amplifier. By adopting the arrangement of the invention, the working mode of the radio frequency coil can be conveniently and quickly switched, and the radio frequency assembly and the receiving coil are used for receiving magnetic resonance signals to obtain richer acquisition information, so that the signal-to-noise ratio of a reconstructed image is improved.

The invention belongs to the technical field of long-wave communication and electronic information, and discloses a cross-medium communication system based on a magnetoelectric mechanical antenna, which comprises the magnetoelectric mechanical antenna, a receiving coil, a transmission medium container, a signal generator, a power amplifier and a static bias magnetic field applying device, the magnetoelectric mechanical antenna is arranged on a support of the static bias magnetic field applying device, the receiving coil is arranged in the transmission medium container, and the main vibration direction of the receiving coil and the main vibration direction of the magnetoelectric mechanical antenna are coaxial; the signal generator is connected with the power amplifier in series, the power amplifier is connected with a lead-out wire of a piezoelectric layer of the magnetoelectric mechanical antenna, and the signal generator provides an excitation signal for the piezoelectric layer of the magnetoelectric mechanical antenna through the power amplifier; and the digital oscilloscope is connected with the port of the receiving coil and is used for collecting electromagnetic wave signals which are captured by the receiving coil and are transmitted by the magnetoelectric mechanical antenna. The cross-medium communication system provided by the invention can realize effective and stable transmission of information among different media.

The invention belongs to the marine electromagnetic exploration technology, and relates to a deep-sea hydrothermal sulfide anisotropy detection system and method, and the system comprises a transmitting system which comprises an X-axis coil whose normal direction is located at an X axis, a Y-axis coil whose normal direction is located at a Y axis, and a Z-axis coil whose normal direction is located at a Z axis, and forms an orthogonal structure; the three-component synchronous receiving system comprises a three-axis receiving coil located in a seabed hole, and the three-axis receiving coil continuously collects the magnetic field intensity, the polarization direction and the three-dimensional space coordinates at each receiving node; the three-axis synchronous control system adopts a multi-frequency orthogonal current signal with a phase difference of 90 degrees; and the processor is used for performing spectral analysis on the signal received by the three-component synchronous receiving system, calculating an anisotropic response ratio in each polarization direction in a horizontal plane according to the complex amplitude response, and determining a superior principal axis direction of conductivity anisotropy according to the anisotropic response ratio. According to the invention, full-angle scanning excitation is realized, and the detection capability of the anisotropic structure of the hydrothermal sulfide is remarkably improved.

A magnetic resonance (MR) receive coil (18) includes a conducting loop (20) that is resonant at a Larmor frequency of a design-basis B0 magnetic field of at least 3 Tesla; and a conducting trace (22) configured to detune the conducting loop from the Larmor frequency in response to a DC current flowing through the conducting trace. The conducting trace further includes a receive |B1|-field uniformity-enhancing inductor (L3) positioned at an intermediate point along the conducting trace.

The invention relates to the technical field of wireless charging, in particular to an automobile wireless charging positioning method based on quantitative displacement, which comprises the following steps: constructing a wireless charging system, and judging a positioning mode and a charging mode by using an additional resistor and a relay; setting different initial positions of the receiving coil, carrying out quantitative displacement on the receiving coil, and collecting corresponding load voltage; constructing a mapping relation between the relative offset and the load voltage; and calculating the deviation angle of the receiving coil and the area of the receiving coil by using the quantitative displacement of the receiving coil. The problems of high cost and system complexity due to the fact that position confirmation of an existing receiving coil needs to be measured by means of an external sensor are solved.

The invention relates to an in-hole transient electromagnetic response characteristic numerical simulation method based on a tunnel three-dimensional geoelectric model and an absorption boundary finite element method, and belongs to the technical field of geophysical exploration. The method comprises the following steps: constructing a tunnel full-space three-dimensional conductivity model; based on a Maxwell equation set, a vector potential and a scalar potential are introduced, a vector control equation of a transient electromagnetic field is derived in combination with Coulomb specifications, first-order absorption boundary conditions are established, and a weak form finite element equation is derived through a Galerkin weighted margin method; generating a global sparse matrix by utilizing spatial discretization and unstructured grid division, and performing iterative solution on the dynamic electromagnetic field by adopting a Newmark time discretization method; and simulating the transient electromagnetic response of geological anomalous bodies with different resistivity and the distance between the geological anomalous bodies and the receiving coil, and analyzing the attenuation characteristic and the geometric gravity center effect to obtain an electromagnetic response rule. The device can accurately simulate the electromagnetic response of abnormal bodies such as aquifers and faults in front of a tunnel face and around drill holes.

A method, a system, and a computer program product for increasing sensitivity and / or readability of contactless cards. One or more signals are received from a first device. Each of the signals is responsive to one or more transmissions generated and sent to the first device by a respective receiving coil, upon being energized. A signal strength of each of the signals received from the first device is determined. A first signal in having a highest signal strength is identified based on determined signal strengths of one or more signals. A first receiving coil corresponding to the first signal is selected. The plurality of receiving coils are de-energized. The selected first receiving coil is energized and a communication with the first device is and established using the selected first receiving coil.