17 results about "Parallel excitation" patented technology

The invention discloses a single-coil multi-layer parallel magnetic resonance imaging method based on multiple excitation in a low field, and the method comprises the steps: achieving the multi-layer parallel excitation through a multi-band pulse, and carrying out the 0-pi phase modulation of the multi-band pulse; constructing a fast spin echo sequence of secondary phase modulation; performing imaging by using the fast spin echo sequence subjected to secondary phase modulation; and reconstruction is carried out through an odd-even echo classification method, and a scanning result graph is obtained. Aiming at the common problem of low signal to noise ratio of low-field magnetic resonance imaging in practical application, based on hardware characteristics of a single coil of low-field magnetic resonance equipment and actual requirements of repeated scanning, a series of SMS related technologies such as an FSE fast spin echo sequence, Hadamard pulse coding, multi-band pulse and secondary phase modulation are combined; and the signal-to-noise ratio of the low-field FSE sequence is effectively improved.

The invention discloses an efficient parallel excitation seawater monopole antenna and wireless communication equipment, the antenna comprises a seawater monopole, a shunt excitation feed structure, a magnetic ring, a metal floor, a dielectric plate and a power divider feed network, the seawater monopole is arranged in the middle of the shunt excitation feed structure; the metal floor is arranged on the upper surface of the dielectric plate, the power divider feed network is arranged on the lower surface of the dielectric plate, the power divider feed network is used for feeding to the shunt excitation feed structure, and the seawater monopole and the bottom of the shunt excitation feed structure penetrate through the metal floor and are flush with the bottom of the dielectric plate. According to the invention, a shunt excitation feed structure is utilized, the dynamism, high efficiency and good reconfigurable capability of the seawater monopole antenna are realized, and the seawater monopole antenna has the advantages of wide frequency band, simple structure, high radiation efficiency and good reconfigurable capability.

The invention belongs to the technical field of detection, and particularly relates to an optical device for pore plate fluorescent material detection, which comprises a tunable laser light source, a reflective optical fiber collimator, an optical filter assembly, a beam splitting cube, a beam expanding lens group and a microlens array, the beam splitter is used for splitting the expanded light beams and focusing the light beams to all the sample holes at the same time to realize parallel excitation. Parallel excitation and detection are achieved through the microlens array, chromatic aberration is eliminated through the reflective light path design, the problems that a traditional hole-by-hole detection mode is low in efficiency and prone to causing fluorescence quenching and protein inactivation are effectively solved, the detection efficiency and precision are remarkably improved, and the detection cost is reduced. The method has a wide application prospect in the fields of biomedical research and clinical diagnosis.

The present invention provides a single-molecule sensing array module, a quantitative analysis chip and a quantitative analysis method, which can achieve high-throughput parallel excitation and sensing of single molecules, and the detection sensitivity limit can reach the single-molecule level; a standard curve can be formed for the optical signals of target molecules at ultra-low concentrations, and the problems of uneven and non-repetitive optical signal intensities can be solved by using digital processing methods, enabling accurate quantitative analysis of ultra-low concentration molecules, improving the detection sensitivity, and the sensitivity level reaching the single-molecule level. It has great application value in the fields of clinical medicine, life sciences, food detection, environmental protection, national defense and public safety, and basic research. It can also be applied to single-molecule immunoassay to achieve single-molecule immunoassay with ultra-low detection limits.

The invention belongs to the field of magnetic particle imaging, particularly relates to a multi-resolution magnetic particle imaging method and system based on magnetic field free line parallel excitation, and aims to solve the problem that high-resolution and high-sensitivity image reconstruction cannot be realized at the same time. The method comprises the following steps: generating a magnetic field free line; moving the magnetic field free line to a target position; the alternating current of the excitation coil is started to generate a single-frequency excitation field, and a voltage signal induced by the receiving coil is collected; extracting amplitudes of different orders of harmonic waves as single pixel values; and mapping the single pixel values corresponding to the harmonic waves of different orders to the spatial positions of the magnetic field free lines until all spatial positions are scanned, thereby obtaining a multi-resolution image. According to the method, multi-resolution images can be obtained simultaneously through single scanning, multi-parameter repeated scanning and additional registration fusion are not needed, and the measurement efficiency is greatly improved. Meanwhile, the multi-resolution image can provide complementary information of structure positioning and concentration quantification, and clinical diagnosis can be guided.

The invention relates to an external excitation inductance parameter design method, a resonant converter and an electric energy conversion system. The method comprises the following steps: determining design indexes and electrical performance parameters of the resonant converter; setting target dead zone time; determining a first expression, a second expression and a third expression of the external parallel equivalent excitation inductor; calculating according to the design indexes, the electrical performance parameters, the target dead zone time, the first expression, the second expression and the third expression, and judging whether the inductance value of the external parallel equivalent excitation inductor meets the requirement or not; if the requirements are met, parameter design of the external parallel equivalent excitation inductor is completed; and if not, readjusting the target dead zone time. According to the LLC resonant converter, the overall efficiency of the LLC resonant converter can be remarkably improved, the LLC resonant converter is suitable for batch and automatic engineering design, the innovative structural design of the external parallel excitation inductor can be flexibly and accurately adjusted, the structure of the main magnetic core does not need to be changed, and the limitation of conventional air gap adjustment is broken through.

The present invention belongs to the field of magnetic particle imaging, and particularly relates to a multi-resolution magnetic particle imaging method and system based on parallel excitation of magnetic field free lines, aiming to solve the problem that high-resolution and high-sensitivity image reconstruction cannot be achieved simultaneously. The present invention includes: generating magnetic field free lines; moving the magnetic field free lines to the target position; turning on the alternating current of the excitation coil to generate an excitation field with a single frequency, and collecting the voltage signals induced by the receiving coil; extracting the amplitudes of different order harmonics as single pixel values; mapping the single pixel values corresponding to different order harmonics to the spatial positions of the magnetic field free lines until all spatial positions are scanned to obtain a multi-resolution image. The present invention can obtain multi-resolution images simultaneously through a single scan, without the need for repeated scans of multiple parameters and additional registration and fusion, greatly improving the measurement efficiency. At the same time, the multi-resolution images can provide complementary information on structural localization and concentration quantification, which helps to guide clinical diagnosis.

The application discloses an end-to-end pulse neural network industrial process fault diagnosis method, and belongs to the field of fault diagnosis and brain-like computing. The method is characterized in that the end-to-end fault diagnosis is performed through a pulse coding module, a multi-scale feature extraction module, a parallel excitation-inhibition module and a pulse decoding module. First, the input process variables are encoded into pulse sequences by using convolution layers and pulse neuron layers with different receptive field sizes. Then, multi-scale high-dimensional features related to faults are extracted by using multi-scale convolution layers, and the extracted multi-scale features are selectively focused by using a channel attention mechanism. Subsequently, the features related to faults are further extracted by using parallel excitatory pulse pathways and inhibitory pulse pathways. Finally, the extracted features are decoded to obtain fault diagnosis results by using convolution layers and fully connected layers. The method can accurately diagnose the faults occurring in industrial processes, and has lower energy consumption compared with traditional methods.

The invention discloses a piezoelectric electromagnetic bimorph sensing structure and a simulation analysis method thereof, and relates to the technical field of sensor design and simulation. The structure comprises a PZT5H piezoelectric layer, an AFC260 alloy elastic blade layer and a PZT5H piezoelectric layer which are stacked in sequence, terminal-ground-terminal parallel excitation is adopted to induce bending vibration, and the resonant frequency can be accurately tuned within the range of 2327 kHz through additional mass. The structure can be further compounded or coupled with a FeGa magnetostrictive layer to form a magnetoelectric sensing unit for non-contact current measurement. According to the matched simulation method, accurate prediction and optimization of resonant frequency, vibration amplitude and stress distribution are realized through parametric modeling, grid encryption, electromechanical / magnetoelectric multi-physics field coupling analysis and stress evaluation. The device is high in integration level and flexible in tuning, remarkably shortens the development period through simulation driving design, improves the reliability, and is suitable for the field of power monitoring and micro sensing.

The internal detection differential mode eddy current probe is composed of three spiral coils and comprises a pair of parallel excitation coils and a detection coil, the excitation coils comprise two pairs of coils connected in parallel, and the two pairs of excitation coils are arranged front and back in the axial direction of a supporting shell. The detection coil is arranged between the two pairs of exciting coils and is orthogonal to the exciting coils, and a magnetic core is additionally arranged between the detection coils to enhance magnetic flux convergence; the winding of the two exciting coils needs to meet the right-hand spiral rule, so that the starting directions of magnetic fluxes generated by the exciting coils are respectively along the two sides of the probe and are finally converged at the magnetic core of the detection coil; when the eddy current defect detection system performs defect detection, the probe scans along the axial direction of the excitation coil, the detection coil captures the change of an induced magnetic field and uploads the change to the computer, and the computer detects different defect information through analysis and processing, so that internal detection of tiny hole-shaped defects and pipeline surface corrosion is realized.

The present invention discloses an aggregation-induced luminescence material, a preparation method thereof, and an application thereof. The structural formula of the luminescent material is as follows: #imgabs0# This material introduces two tetraphenylethylene (TPE) structures into a fluoroboron dipyrrole dye, and has better aggregation-induced luminescence performance in solution, with a quantum yield of 86%. At the same time, the aggregation-induced luminescence material is introduced into a laser design with whispering gallery properties, thereby improving the energy utilization efficiency of the excitation laser, while significantly reducing the detection threshold and improving the laser stability, thereby realizing a low-threshold organic dye microcavity laser. The system and method of the present invention can also achieve parallel excitation of multiple microbubble cavities by adjusting the laser spot, which has the advantage of achieving multi-wavelength output. And there is no need to pull a tapered optical fiber to introduce pump light, and the device is more robust. The process of the present invention is simple, easy to operate, easy to replace liquid, and has a low production cost, which broadens the application prospects of organic materials in micro-nano lasers, materials, and detection fields.

The invention provides a pre-balanced parallel excitation method and device, and belongs to the technical field of lithium ion batteries, and the method comprises the steps: starting equipment, switching a relay to a current sharing gear, and carrying out the current sharing of different parallel battery monomers until the equipment detects that the current sharing is completed; switching the relay to an excitation gear, and carrying out an impedance test; and collecting excitation current and response voltage flowing through each parallel single body, switching the relay to a current sharing gear after the test is completed, and ending the test. The battery pack does not need to be disassembled to damage the integrity of the battery pack. Impedance data of all the batteries under the same SOC can be collected at a time, and compared with traditional single-channel equipment, the detection time can be saved by more than 99%.

The invention provides a synchronism detection and abnormity protection device and method for a spacecraft multi-set parallel excitation vibration test system, and the device comprises a vibration controller, a vibration table, power amplifiers, a current sensor, an acceleration sensor, and a synchronous detection circuit box. Each power amplifier is in power signal connection with an independent vibration table, each power amplifier is connected with an independent current sensor, each vibration table is connected with an independent acceleration sensor, and the current sensors and the acceleration sensors are in signal connection with a synchronous detection circuit box. And the synchronous detection circuit box is in signal connection with the vibration controller.

The present invention relates to the technical field of excitation signal processing circuits, and discloses a design method for an excitation signal processing circuit capable of eliminating parasitic capacitance reactance. At the rear end of an excitation capacitive sensor, a capacitor with parallel excitation is added, and the excitation signal of this capacitor is the same as that of the sensor itself. However, the excitation processing methods at the rear end are different. One path converts the AC excitation signal into a positive voltage / positive current output, and the other path converts the AC excitation signal into a negative voltage / negative current output. The two processing methods are controlled by a switch array logic. By using the symmetry principle and the summation cancellation principle of AC signals, parasitic parameters such as capacitance reactance during cable transmission are eliminated. At the same time, it can also be used as a dual-channel redundancy output, enabling dual-redundancy feedback output for DC measurement of capacitive sensors. The present invention is used to eliminate the parasitic capacitance reactance brought by the measurement output end of the sensor, realize long-distance transmission of capacitive sensors, and support dual-redundancy synchronous measurement.

The utility model belongs to the technical field of vibration test, and discloses a parallel excitation vibration test device, which comprises a plurality of vibration tables, a test tool, an external guide assembly and a connecting piece, and is characterized in that the plurality of vibration tables are arranged at intervals along the linear direction; the test tool is used for mounting a test piece; one end of each connecting piece is in transmission connection with the output end of the corresponding vibration table, and the other end of each connecting piece is in rigid connection with the test tool; the external guide assembly is arranged in the circumferential direction of the test tool in a surrounding mode, one end of the external guide assembly is fixedly connected to the foundation, and the other end of the external guide assembly is fixedly connected to the test tool so that transverse shaking of the test tool can be reduced. The test tool is in rigid transmission connection with the vibration table through the connecting piece, the external guide assembly provides guidance for vibration of the test tool, transverse shaking of the test tool can be reduced, the ability of the test tool to move in the vertical direction is improved, and therefore a plurality of vibration tables can be connected, the number of control points is increased, and the vibration magnitude and the frequency range are improved. And various test requirements are met.

The embodiment of the application provides a fusion system of a phase modifier and an in-station energy storage of a new energy power station, comprising: a phase modifier and an energy storage system arranged in the new energy power station, the fusion system comprises an energy storage independent excitation mode, an energy storage excitation and self-parallel excitation complementary mode, an energy storage independent starting mode and an energy storage standby starting mode, the application can effectively fuse the phase modifier and the energy storage system in the new energy power station, improve the reliability of the phase modifier equipment and the utilization rate of the energy storage system, and fully play the supporting role of the phase modifier on the new energy power grid.

This invention discloses an ultra-wideband side-fire Vivaldi phased array antenna conformally to the surface of a flight platform fuel tank, and the flight platform fuel tank itself. The antenna body includes: a dielectric substrate layer conformally to the composite material surface of the flight platform fuel tank, and a metallic radiating layer and a feed network layer attached to the upper and lower surfaces of the dielectric substrate. The metallic radiating layer has a mirror-symmetrical bidirectional extension structure; it has gradually widening outward-facing slots and a circular resonant cavity on both sides, achieving a side-fire effect after conforming to the cylindrical surface. The feed network uses a microstrip line structure to provide parallel excitation signals to the metallic radiating structure. This invention is suitable for large-area array deployment on the surface of a flight platform, effectively solving the contradiction between low antenna profile, wide bandwidth, and high-gain side-fire while maintaining the aerodynamic shape.