22 results about "Array coil" patented technology

The invention discloses a bladed disc detection system based on a flexible eddy current sensor, and the system employs rubber as a flexible substrate of a flexible array probe, can adapt to each complex region of the surface of a blisk, guarantees the fitting of the flexible array probe and the surface of the bladed disc to the greatest extent, and improves the detection precision. The flexible circuit board integrated with the array unit has higher deflection, and can ensure that the arrangement and the structure of the array coil are not damaged under the condition of simultaneously adapting to the curvature change of the leaf disc and the rubber; and the distances between the central point of the excitation coil or the detection coil on the outermost layer and the two sides of the flexible circuit board are respectively 6mm and 4mm, so that the detection blind area is smaller.

The invention discloses a sparse and dense stacked nonlinear electromagnetic ultrasonic detection transducer and a pipeline creep detection device, and relates to the technical field of pipeline creep damage detection. The sparse coil (namely the first coil) with the distance between the wires equal to the half-wavelength of the fundamental frequency ultrasonic waves and the dense coil (namely the second coil) with the distance between the wires equal to the quarter-wavelength of the fundamental frequency ultrasonic waves are arranged in a stacked mode to form the sparse and dense stacked coil. Fundamental frequency ultrasonic waves with enough strength can be effectively excited to enter a material of a detected pipeline, and nonlinear ultrasonic response signals (namely second harmonic signals) generated by lattice nonlinear change caused by early creep micro-damage (such as micro-voids, grain boundary slippage and dislocation pinning point weakening) in the material are captured and enhanced in a high-sensitivity manner; and timely and reliable technical guarantee is provided for safe operation of the pipeline.

The invention discloses an array coil excitation coupling eddy current detection probe, system and method and a related device, and relates to the technical field of nondestructive testing. The probe comprises a double-coil excitation module and a sensing module; the double-coil excitation module comprises two semicircular Helmholtz coils; the two semicircular Helmholtz coils are symmetrically arranged, are parallel and coaxial, and are electrified with alternating-current excitation current with the same direction, the same frequency and the same phase; the distance between the two semicircular Helmholtz coils is adjustable; and the sensing module is arranged in the central area of the two semicircular Helmholtz coils and is used for detecting the magnetic field change caused by the eddy current field at the defect. According to the invention, the detection precision of pipeline corrosion, cracks and composite defects can be improved.

The present application relates to the technical field of nondestructive testing, and provides a kind of dynamic characteristic eddy current detection system and method of scraper chain to solve the problems of low detection efficiency, unable to measure tension and speed synchronously, and probe is easily damaged in harsh environment and inconvenient to maintain, etc.The technical scheme of the system mainly includes: probe detection unit, adopts built-in iron core array coil layout, synchronously induces dynamic eddy current determined by chain speed and induced eddy current caused by tension change;Detection protection unit is provided with upper and lower open and close maintenance opening for quick maintenance;And detection lift-off regulation unit can accurately adjust the distance between probe and chain.The present application can realize the online synchronization, high-precision monitoring of scraper chain tension and speed, significantly improve the detection efficiency and reliability, and at the same time enhance the environmental adaptability and maintenance convenience of the system, and provide effective support for intelligent operation and maintenance of scraper conveyor.

The invention discloses an extensible three-layer decoupling array coil structure, an extensible array coil and a wireless electric energy transmission system, and relates to the technical field of wireless electric energy transmission, a partial element equivalent method is introduced to extract inductance parameters of regular hexagonal coils, the relation between the overlapping size and mutual inductance of adjacent coils is constructed, and model calculation shows that the inductance parameters of the regular hexagonal coils are calculated to be larger than the inductance parameters of the regular hexagonal coils. And when the overlapping size between the adjacent coils is 32.42 mm, the coils are decoupled. In addition, for load position detection, a flexible film pressure sensor detects a load pressure value to realize position positioning, and single-coil, double-coil and three-coil local intelligent charging modes of the array system are switched according to different load positions, so that reasonable utilization of energy is realized.

Example embodiments provide a voice coil array speaker comprising a speaker assembly, a coil assembly, and a magnet assembly. The speaker assembly may comprise a speaker frame, a stationary base plate, a diaphragm configured to be capable of axial movement, a heat conducting front plate connected to the diaphragm, and thermal bridges configured to conduct heat from the heat conducting front plate to the speaker frame. The coil assembly may be connected to the heat conducting front plate, the coil assembly may comprise an array of coils wound around coil formers. The magnet assembly may be attached to the stationary base plate, the magnet assembly may comprise an array of laterally and vertically polarized magnets in contact with flux concentrators. The array of coils may be connected such that the direction of current flow alternates between clockwise and counterclockwise moving laterally across the array.

The application discloses a three-dimensional coil combination excitation pose detection system and method for force tactile reproduction, which comprises a three-dimensional background electromagnet module, a fingertip electromagnet module, a background electromagnet driving module, a fingertip voltage sensing module and a central control module. The three-dimensional background electromagnet is of an inner-outer layer nested type, the inner layer is a one-dimensional laminated coil electromagnet, and the outer layer is a two-dimensional array coil electromagnet. Some three-dimensional background electromagnet coils are selected to have electromagnetic pose detection and force tactile reproduction functions, so that electromagnetic pose detection based on three-dimensional coil combination excitation and position grid optimization is realized. A cost function is established according to the fingertip electromagnet module induction voltage theoretical value obtained through simulation and the actual measured value of the induction voltage obtained through the voltage sensing module, and the pose of the fingertip electromagnet, namely the position information and the rotation angle information, are solved and obtained. The interactive force that a virtual hand receives in a virtual interactive environment is calculated, and a control signal is output to the electromagnet driving module, so that force tactile reproduction is realized.

The application discloses an underwater robot detection method and system based on arrayed coils, belongs to the technical field of wireless power transmission system detection, and combines multiple detection coils to form an arrayed detection coil group, at least two arrayed detection coil groups are arranged at predetermined positions along a preset motion track of an underwater robot, an impedance change detection circuit is connected to each detection coil, the position of the underwater robot relative to the coils can be determined by using the double arrayed detection coils, different diameters of different models of the underwater robot can be distinguished, whether the underwater robot deviates can be monitored, the speed of the underwater robot at the moment can be determined, the pose of the underwater robot can be better adjusted, the measurement error can be better reduced by uniform arrangement and symmetrical distribution, the underwater robot can safely and stably enter the charging device, and the charging device and the underwater robot are prevented from being damaged.

A Magnetic Resonance Imaging (MRI) scan method and an MRI system are provided in the present disclosure. The method may include generating a first hydrogen nucleus image of an object using a Radio Frequency (RF) coil of the MRI system, and further include identifying at least one coil identification of at least one multi-nucleus coil in the first hydrogen nucleus image. The at least one multi-nucleus oil is placed on body surface of the object. The method may also include determining an imaging range of the at least one multi-nucleus coil based on the at least one identified coil identification in the first hydrogen nucleus image, and determining whether to generate a multi-nucleus image of the object using the at least one multi-nucleus phased-array coil based on the imaging range of the at least one multi-nucleus oil and a Region Of Interest (ROI) on the first hydrogen nucleus image.

The embodiment of the invention provides a cerebral blood flow synchronous array coil system and a cerebral blood flow detection method, and belongs to the technical field of magnetic resonance imaging. The device comprises a controller, a radio frequency power amplifier, a neck coil, a signal source and a coil connector, the controller is used for receiving a first enable signal generated by the MRI equipment cabinet, generating a second enable signal and triggering the neck coil and the matched radio frequency power amplifier to synchronously enter a working state; the signal source is used for providing a second radio frequency pulse; after receiving the second enable signal, the radio frequency power amplifier enters a working state, amplifies a second radio frequency pulse and sends the amplified second radio frequency pulse to the neck coil; the neck coil receives the second radio frequency pulse and is used for applying a pulse signal to a neck area and receiving a second enable signal to enter a working state; the coil connector is used for signal transmission between execution components. According to the embodiment, the accuracy and efficiency of cerebral blood flow detection of the experimental subject can be improved.

The utility model relates to the technical field of magnetic resonance imaging, in particular to a receiving and transmitting integrated array coil and magnetic resonance equipment. The receiving and transmitting integrated array coil comprises N coil unit groups arranged along a first direction, each coil unit group comprises M coil units arranged along a second direction, the first direction is perpendicular to the second direction, and both M and N are integers not less than 2; the M * N preamplifiers are connected to the M * N coil units in a one-to-one correspondence manner; the N power dividers are respectively connected to the M coil units in different coil unit groups in a manner of being in one-to-one correspondence with the N coil unit groups; wherein the M * N preamplifiers are used for being connected to a receiver of magnetic resonance equipment, and the N power dividers are used for being connected to the N radio frequency power amplifiers in a one-to-one correspondence mode.

This invention discloses a telescopic roller conveyor, relating to the field of conveyor technology, including protective outriggers; a flexible guardrail for protection is rotatably mounted on the top plate of the protective outriggers. By adjusting the on / off state of the electromagnetic coil inside the adsorption sleeve, dynamic rigid constraint of the telescopic boom under heavy load or high-speed conditions and energy-saving control under light load conditions are achieved, significantly improving the stability and positional accuracy of the telescopic process; the relative sliding detection mechanism of the photosensitive plate and the light emitter integrated inside the protective outriggers can automatically cut off the power to the drive motor or issue an alarm when the telescopic range exceeds the limit, effectively preventing damage from overtravel; the supporting roller adopts a radially adaptive steering rod and array sleeve combination structure, which allows the surface to automatically conform to the material contour, avoiding local stress concentration and material damage. At the same time, the equivalent diameter of the roller can be actively adjusted by controlling the array coil.

The application discloses a micro electromagnetic eddy current sensor device and a detection method thereof, and relates to a nondestructive testing technology for crack defects (12) of air holes (11) of an aircraft engine turbine blade (1). The device is connected to a detector (2) through a lead (21), and the sensor device (3) comprises a controller (31) and a detection coil (32). The detection coil (32) is characterized by being an array coil unit (321) vertically arranged in a winding direction. The volume of the detection coil unit does not need to be too small, and the manufacturing difficulty of the detection probe in the detection device is greatly reduced.

To provide an eddy current flaw detection device and an eddy current flaw detection method capable of performing inspection in a shorter time while preventing the interference of a magnetic field.SOLUTION: An eddy-current flaw detection device includes an array coil including a pair of excitation coils disposed apart from each other in a first direction and a detection coil, and a voltage application unit that applies alternating current voltage having a phase difference of 180° between the pair of excitation coils. An eddy-current flaw detection method uses an array coil including a pair of excitation coils disposed apart from each other in a first direction and a detection coil, and includes a step of applying alternating current voltage to one of the pair of excitation coils, and a step of simultaneously applying, to the other of the pair of excitation coils, alternating current voltage having a phase difference of 180° from the alternating current voltage applied to the one of the pair of excitation coils.SELECTED DRAWING: Figure 3

The embodiment of the invention provides a wearable magnetic stimulation device for neurological rehabilitation and a control method thereof, and belongs to the technical field of magnetic field treatment instruments. The device comprises a flexible circuit board module which is used for supporting and connecting each functional module and is of a flexible extensible structure; the magnetic stimulation module is configured to generate a magnetic field to achieve nerve stimulation, the magnetic stimulation module comprises a plurality of coil units arranged in an array mode, and each coil unit can be independently controlled to achieve multi-block targeted magnetic stimulation output; the dynamic shielding layer modules are arranged on the outer sides of the coil units respectively, each coil unit is correspondingly provided with one dynamic shielding unit, and the dynamic shielding layer modules are used for limiting magnetic field diffusion of the corresponding coil unit and enhancing the magnetic field focusing effect of the corresponding coil unit; and the control module is used for dynamically adjusting the working states of the magnetic stimulation module and the dynamic shielding layer module. According to the scheme, the problems of poor targeting and lack of dynamic regulation in existing magnetic stimulation are solved.

The utility model discloses a special radio frequency array coil device for horizontal field magnetic resonance intervention in the technical field of nuclear magnetic resonance, which comprises an instrument main body, a lying bed is arranged on one side of the instrument main body, a disinfection bin is arranged on one side of the instrument main body, an electric push rod is arranged at one end of the disinfection bin, a first groove is formed in the disinfection bin, and a second groove is formed in the other side of the disinfection bin. An ultraviolet disinfection lamp is arranged in the first groove, through the arrangement of the disinfection bin, the ultraviolet disinfection lamp and an ozone generator, the ultraviolet disinfection lamp can kill various pathogenic microorganisms on the surface of the coil device body, and ozone is a rapid and efficient bactericide and can kill pathogenic viruses, germs and microorganisms. According to the coil device disclosed by the invention, the biological structure of bacterial viruses is destroyed by utilizing the extremely strong oxidability of ozone, so that the effect of sterilizing and disinfecting the surface of the coil device body is realized, and the ozone is harmless to a human body, so that the using effect of the device is improved, and the service life of the coil device body is prolonged.

The application relates to a nonlinear encoding imaging method and system, relates to the field of nuclear magnetic resonance, and solves the problem that an image cannot be directly obtained through Fourier transform for image reconstruction under nonlinear encoding. The method comprises the following steps: acquiring a uniform ring-distributed sub-encoding field of coil units around a Z axis, so that the current amplitude of all the coil units is distributed on a sine curve in a period, and a static encoding field is generated through superposition; performing sine modulation on the current amplitude of the coil units, so that the current amplitude of all the coil units changes in the sine period, a dynamic encoding field is generated; a nuclear magnetic resonance signal generated by the dynamic encoding field and excitation is received through a radio frequency receiving array coil group, additional spatial encoding information provided by the sensitivity distribution of the radio frequency receiving array coil group is analyzed, a target image is acquired, and reconstruction is performed. The application has the following effects: when the encoding field is a nonlinear encoding field, the rapid imaging of a nuclear magnetic resonance image can be effectively ensured.

The defect detection device detects a defect of a rotor core, and the rotor core has a cylindrical shape centered on an axis, and has a plurality of slots which are recessed from an outer peripheral surface toward a radial inner side and are arranged at intervals in a circumferential direction. The first surface is formed by a pair of first surfaces which are opened towards the outer peripheral side when observed in the axis direction and extend in the radial direction. A tenon part which is formed by a pair of inclined surfaces which are communicated with the head part and of which the interval in the circumferential direction gradually increases toward the inner circumferential side; and a trunk section formed by a pair of second surfaces that communicate with the tenon section and extend in the radial direction, the defect detection device being provided with: a device body having a first inspection surface that comes into contact with the first surface, an inclined inspection surface that comes into contact with the inclined surface, and a second inspection surface that comes into contact with the second surface; the plurality of array coils are respectively embedded in the inner sides of the first inspection surface, the inclined inspection surface and the second inspection surface; and a plurality of permanent magnets arranged in parallel with the array coil.

The utility model discloses a kind of multi-phase row type inductors, by prefabricated array coil and a group of magnetic core assembly molding, wherein magnetic core main body is shaped as oblong block, and the side wall in three directions of magnetic core is flat, the remaining one long side wall is provided with two-to-one group array slot and penetrates top and bottom two sides, the slot aperture of the protruding post bottom formed between each group of slots is inwardly retracted by one slot, any group of coil has three folded sections of protruding post wrapped from bottom to top and electrode pad folded in opposite direction at both ends, coil is positioned in slot and a group of magnetic core is edge-bonded with protruding post opposite direction, wrap coil into an integral whole. The inductor effectively saves the space occupied by inductive device in PCB circuit, can meet the design requirement of smaller terminal product volume, and reduces the interference influence to periphery, further perfects the operation environment of circuit.

The invention relates to the technical field of electromagnetic ultrasonic detection, in particular to an electromagnetic ultrasonic transducer of an annular coil structure and a design method of the electromagnetic ultrasonic transducer of the annular coil structure. The electromagnetic ultrasonic transducer of the annular coil structure comprises a cylindrical permanent magnet and a PCB annular array coil, circumferential and axial static bias magnetic fields are provided; the PCB annular array coil is composed of a first coil and a second coil which are located on the same axial plane, the first coil and the second coil are annular coils, the first coil and the second coil are connected in an end-to-end mode and are wound in a double-layer mode, the head end and the tail end of each coil are connected with an external wire respectively, and the wires guide external excitation current. The electromagnetic ultrasonic transducer of the annular coil structure can control the phase length and destructive interference of symmetric and antisymmetric modes in Lamb waves according to the mode of controlling the width of the coil, namely the number of turns and the like, and excitation of the omnidirectional single-mode Lamb waves is achieved.

The invention relates to the technical field of magnetic resonance imaging, in particular to a low-field magnetic resonance head imaging radio-frequency coil system, which comprises a flexible array coil sensing module for acquiring head magnetic resonance original radio-frequency signals, coil coupling state data and environment interference parameters; the dynamic field intensity calibration module constructs a dynamic magnetic field distribution model, corrects low-field magnetic field uniformity deviation in real time through a multi-source magnetic field compensation algorithm, and outputs magnetic field calibration data; the intelligent imaging optimization center identifies low-field imaging artifacts by using an improved CNN-Transform model according to the original radio frequency signal and the magnetic field calibration data, locates a distortion source and generates an optimization scheme; the three-dimensional imaging reconstruction unit builds a head three-dimensional imaging model, fuses an anatomical structure and signal distribution, and outputs a preliminary imaging result; the self-adaptive radio frequency regulation and control unit predicts coil performance attenuation and imaging risks and dynamically adjusts radio frequency parameters. Therefore, the problems of unbalanced transceiving efficiency, poor universality and the like in the prior art are solved.

The utility model discloses a coil sensor composite assembly applied to a planar motor and the planar motor, and the coil sensor composite assembly comprises at least two layers of coil arrays which are parallel to each other, and a sensor module which is clamped between the two layers of coil arrays and is used for detecting the position information of a mover. The sensor module comprises a sensor circuit board and a magnetic field sensor array arranged on the sensor circuit board, the coil array is formed by arranging a plurality of coils, each layer of coil array is arranged in an up-and-down overlapping manner, and the coil arrays are arranged in series. A rotor or a stator of the planar motor adopts the coil sensor composite assembly. The coil sensor composite assembly is simple in structure, and the magnetic field detection range is expanded and the detection sensitivity is improved on the premise that the measuring range of the sensor is not expanded through ingenious position improvement of the magnetic field sensor array.