46 results about "Multiple pulse" patented technology

By utilizing soliton self-frequency shift modulation, the formation of multiple pulsed light beams is suppressed, while the occurrence of ASE (Autonomous Emission Reduction) is suppressed, and the modulated pulsed light beam is reliably amplified. [Solution] The pulsed light generation device 100 comprises an oscillator 1 that oscillates pulsed light L, a fiber amplifier 2 located downstream of the oscillator 1 in the optical path of the pulsed light L, a soliton shift fiber 5 located downstream of the fiber amplifier 2 in the optical path of the pulsed light L, a branching section 8 located downstream of the fiber amplifier 2 in the optical path of the pulsed light L, and a short-wavelength fiber amplifier 11 located downstream of the soliton shift fiber 5 and the branching section 8 in the optical path of the pulsed light L.

This invention provides a millimeter-wave isolation circuit and isolator with multiple receiving links. Its millimeter-wave receiving module includes two or more dipole antennas and receiving units connected one-to-one with each dipole antenna. Each dipole antenna and its corresponding receiving unit constitutes a receiving link. The two or more dipole antennas are arranged along their length, with the radiating elements of consecutive dipole antennas connected end-to-end, forming a millimeter-wave receiving antenna array. It is configured to receive the millimeter-wave signal through two or more receiving links and then output two or more identical pulse signals. This invention enables synchronous reception of multiple pulse signals based on a single structure, ensuring minimal time deviation at the receiving end and reducing system power consumption and cost.

This invention discloses a method for optimizing airborne radar detection waveforms in multi-pulse accumulation scenarios. The method involves calculating the current transmit modulation vector based on the target airborne radar's current phase-coded waveform, target beam pointing angle, and attribute parameters; calculating the current transmit signal space based on the current transmit modulation vector, current phase-coded waveform, and attribute parameters; calculating the current angular domain waveform based on the current transmit modulation vector and current transmit signal space; determining the current cross-correlation sidelobe level, current autocorrelation sidelobe level, current transmit beam pattern, and current Doppler sidelobe level of the current angular domain waveform and other angular domain waveforms, respectively, and substituting these values ​​into a target optimization function to obtain the current target value; and determining the target transmit waveform based on the current target value and a preset iteration termination condition. This invention significantly improves the radar's anti-sorting and anti-spoofing capabilities while maintaining detection performance.

The present application relates to the field of aerospace technology, specifically to a kind of multi-pulse parallel construction method of gravitational wave detection formation considering timing optimization, each spacecraft of formation simultaneously departs from virtual center, each spacecraft is moved to the preset specified position by applying multiple pulses, so as to form a kind of spacecraft formation that can be used for space gravitational wave detection, by giving the steps of calculating the initial position and velocity of each spacecraft and applying initial control to reach the initial position and velocity, the state quantity of each spacecraft at each time in the formation construction process is calculated, so as to provide reference for the design of satellite formation task in actual engineering application, and the accuracy of the linearized relative motion dynamics model established by the multi-pulse parallel space gravitational wave detection formation is improved by differential correction, the error in the relative motion dynamics model is reduced, the initial state set in advance can be effectively reached, and the working efficiency of formation component is improved.

This invention relates to the field of power equipment monitoring technology, specifically to a method and system for phase remapping-enhanced partial discharge ultrasonic feature extraction. The method first acquires partial discharge ultrasonic signals and power frequency synchronization voltage signals; performs pulse event detection on the partial discharge ultrasonic signals to obtain multiple pulses; extracts the amplitude and occurrence time of each pulse; converts the occurrence time of each pulse into a power frequency phase based on the power frequency synchronization voltage signal; maps the amplitude of each pulse to a power frequency cycle according to its phase, constructing a phase-amplitude sequence; and performs a Fourier transform on the phase-amplitude sequence to extract the amplitudes of the 50Hz and 100Hz components. This invention enhances spectral characteristics through pulse event detection, power frequency phase calibration, and periodic sequence remapping.

A multiple-pulses-in-air (MPiA) laser scanning system configured for measuring the time-of-flight of laser pulses, wherein the computing unit is configured for triggering the transmitter to transmit the send pulses with a varying pulse frequency, wherein the transmitter is configured to have a dead mode, wherein in the dead mode an increase in pulse frequency is effected, wherein in the course of increasing the pulse frequency, a reduction in pulse energy per individual send pulse of the send pulses is provided such that the pulse energy of the resulting return pulses is reduced such that it is below a detection threshold, and a measurement mode, wherein in the measurement mode a reduction in pulse frequency compared to the dead mode is effected.

This invention belongs to the technical field of fluorescence lifetime measurement, and discloses a fluorescence lifetime measurement method and system based on time-gated fluorescence imaging. The method includes: acquiring multiple frames of fluorescence images of a sample, wherein the frame rate is greater than the pulse frequency of the pulse beam, and the frame rate and pulse frequency are not integer multiples of each other; the phase difference between two fluorescence images is a delay difference between the sampling delay of the two fluorescence images and their respective reference times; the reference time of each fluorescence image is the on-time of the pulse beam corresponding to its acquisition; calculating the average gray level of the fluorescence images; arranging the average gray levels within multiple pulse beam periods according to the sampling delay to obtain a time-gated sequence of average gray level variation with sampling delay; and obtaining the fluorescence lifetime of the sample by data fitting based on the time-gated sequence. Based on this method, the complexity and cost of detection can be reduced, and the limitations on application scenarios can be lessened.

The application belongs to the technical field of fault diagnosis, and discloses a lightning protection device online fault diagnosis method and system based on multi-pulse waveform feature enhancement and a storage medium. Multi-channel synchronous acquisition units are deployed at an SPD body, a power grid incoming line end and a grounding loop to completely capture multi-pulse full-dimension original data. A three-dimensional feature system of fine features in a single pulse, correlation features between multiple pulses and fault source map features is combined with fault sensitivity analysis and ISEDBO algorithm optimization weighting to nonlinearly enhance high-sensitivity deterioration features, accurately amplify cumulative aging and early weak deterioration signals under continuous impact, adopt a VMD-SVD two-stage noise reduction scheme optimized by a scarab algorithm to adaptively separate noise, a power frequency fundamental wave and a pulse transient component, and eliminate pulse reflection crosstalk and pre-sequence residual wave distortion through deconvolution operation while completely retaining fault propagation core features.

The application discloses a modular multi-channel ultrafast framing camera and a multi-pulse laser combined imaging system, and relates to the technical field of ultrafast imaging and photoelectric measurement. The camera comprises a common-aperture framing optical assembly, a double-camera assembly and a total electronic control assembly, can be combined to realize single-view four-channel eight-framing imaging, can be split to realize double-view four-framing stereoscopic PIV imaging, and the double assemblies share a total electronic control unit. The laser system comprises two multi-pulse lasers, a synchronous control module and a beam combination unit, can be combined to form eight-pulse illumination, or independently output adaptive double-view illumination. The imaging system takes laser as a time sequence main source, is synchronized with the camera at the nanosecond level, and a single-frame ultra-short exposure can freeze a high-speed transient process. The application is convenient to switch between double modes, efficient to deploy, does not need to repeatedly purchase hardware, has a high cost performance, and is suitable for high-precision measurement of high-speed supersonic flow and other transient processes.

This invention discloses a clutter false alarm suppression method based on multi-feature fusion, comprising: acquiring radar echo signals and performing pulse compression processing to obtain time-domain echo data; performing clutter suppression and coherent accumulation on the time-domain echo data to obtain a range-Doppler matrix; performing constant false alarm detection on the range-Doppler matrix to obtain several potential target points; extracting the multi-pulse echo signals and unsuppressed frequency domain signals corresponding to the potential target points from the time-domain echo data, extracting the corresponding clutter-suppressed frequency domain signals from the range-Doppler matrix, and constructing multi-dimensional features for each potential target point based on the extracted signals; inputting the multi-dimensional features into a pre-trained classifier, determining whether the potential target point is a target or false alarm clutter based on the output results, and outputting the final target point trace. This invention effectively suppresses clutter false alarms in complex environments and improves radar detection reliability through multi-dimensional feature fusion and secondary decision-making by the classifier.

The application discloses a zero point dynamic learning method and device, computer equipment and a storage medium. The method belongs to the technical field of zero current detection and comprises the following steps: determining the number of pulse width modulation periods for zero point dynamic learning; generating a trigger signal in a power tube off window period in each pulse width modulation period; acquiring first voltage data collected on a sampling resistor in the power tube off window period in response to the trigger signal; calculating a zero voltage estimation value based on the first voltage data of multiple pulse width modulation periods; and calculating a dynamic zero reference value based on the zero voltage estimation value and a current zero reference value. The embodiment of the application adopts an online sampling strategy of a power tube synchronous off window. In a current zero crossing window period of each PWM period, the voltage of the sampling resistor is continuously collected by an ADC, and the zero reference of current detection is dynamically updated after sliding average processing, so that the detection accuracy and consistency are guaranteed under all working conditions.

The embodiment of the application relates to the technical fields of image processing and water quality detection, and provides a laser matrix bombardment water quality detection method and system based on a multi-pulse fusion algorithm, the method comprising: performing contour extraction on an image corresponding to a to-be-detected sample to obtain first contour information, extracting coordinate information corresponding to each pixel point in the first contour information, determining the coordinate information corresponding to each pixel point in the first contour information as position information corresponding to the to-be-detected sample to obtain first position information, reconstructing a preset laser matrix according to the first position information and a preset reflection loss rate threshold to obtain a first laser matrix, and performing water quality detection on the to-be-detected sample by using the first laser matrix according to a multi-pulse fusion algorithm to obtain a target detection result, the multi-pulse fusion algorithm comprising dynamic weight distribution based on a signal-to-noise ratio and spectrum information fusion, and the accuracy of water quality detection on the to-be-detected sample is improved.

This application relates to the photovoltaic field, providing a method for fabricating a solar cell, a solar cell, and a photovoltaic module. The method includes: providing a pre-formed silicon wafer with a pre-formed surface; controlling multiple first pulses in a pulsed laser to scan sites on the pre-formed surface to form active sites by activating the sites; controlling multiple second pulses in the pulsed laser to scan the active sites to selectively etch the pre-formed silicon wafer to obtain a silicon wafer; the etched pre-formed surface forms a textured surface, and the selective etching characterizes the etching of portions at the active sites on the pre-formed silicon wafer. The multiple first pulses and multiple second pulses are multiple pulses emitted sequentially by the pulsed laser in the same scanning step, and the energy density of the pulses in the pulsed laser is lower than the energy threshold for polishing the pre-formed surface. This application at least helps to improve the problems of low cell efficiency caused by disordered textured surfaces, large thermal damage, and poor passivation performance in laser texturing in the prior art.

This invention proposes a method and apparatus for synthesizing array radar radiation patterns using space-time joint modulation. The method includes: determining initial values ​​of the array radar element excitation coefficients; acquiring the array far-field radiation pattern under the influence of the initial values ​​of the element excitation coefficients; dividing the array far-field radiation pattern into main lobe and side lobe regions based on its characteristics; setting the random modulation phase of the main lobe region to zero, maintaining the same main lobe phase across different pulses, while modulating the phase of the side lobe region regularly or randomly, while keeping the array far-field radiation pattern amplitude constant, thus obtaining array radiation patterns with different phase characteristics under multiple pulses; performing Fourier transforms on the array radiation patterns under different pulses to obtain the space-time two-dimensional element excitation coefficients; and applying the space-time two-dimensional element excitation coefficients to the array radar system to synthesize the array radar radiation pattern after space-time joint modulation. This invention significantly improves the array radar's resistance to sidelobe clutter and interference.

This disclosure relates to the optical fiber sensing technology, and more particularly to an optical time-domain reflectometer and an interference fading rejection method, and includes a laser device, a frequency division multiplex modulator, a circulator and a signal processing device, wherein the frequency division multiplex modulator includes a first modulator, a second modulator, a first attenuator and a second attenuator, the laser device is used to acquire a coherent light source, the coherent light source passes sequentially through the first modulator and the first attenuator to acquire the first pulsed optical signal, the coherent light source passes sequentially through the first modulator and the second modulator to acquire the second pulsed optical signal, the coherent light source passes sequentially through the second attenuator and the second modulator to acquire the third pulsed optical signal, and the output of multiple pulsed optical signals can be realized by different combinations of the first modulator, the second modulator, the first attenuator and the second attenuator, saving hardware costs compared to existing technologies.

The application discloses a shift register, which comprises at least one shift register unit, and the shift register unit comprises: a reset unit, two signal input ends of the reset unit are respectively used for inputting a set signal and a reset signal, and the reset unit is used for determining the level of an output enable signal according to the set signal and the reset signal; a current stage signal generating unit, the current stage signal generating unit is used for inputting a first clock signal and the set signal respectively, and the current stage signal generating unit is used for triggering the level of a scanning signal output end to follow the level of the first clock signal during the enable signal being an invalid level based on the effective level of the set signal; and a first maintaining unit, the first maintaining unit is connected between the scanning signal output end and a first level, and the control end of the first maintaining unit inputs the enable signal, and the first maintaining unit is used for resetting the potential of the scanning signal output end to the first level at least when the input enable signal is an effective level. Since the multiple-pulse line scanning signal realizes multiple programming and compensation, the display effect of a display panel driven by the shift register is improved. The application further provides a gate driving circuit and an active display.

This invention relates to the field of semiconductor technology and discloses a delay simulation device and method for semiconductor devices, comprising: a channel module including multiple data transmission channels corresponding one-to-one with multiple wiring channels; a transmitting module for transmitting pulse signals to the data transmission channels; a transmitting detection module for detecting the waveform of the pulse signals transmitted by the transmitting module to determine the transmitting timing corresponding to each data transmission channel; a receiving module for receiving the multiple pulse signals corresponding one-to-one with the multiple data transmission channels; a receiving detection module for detecting the waveform of the pulse signals received by the receiving module to determine the receiving timing corresponding to each data transmission channel; and a processing module for configuring transmission parameters for each data transmission channel to simulate the corresponding wiring channel and for determining the delay of each data transmission channel. This invention can calculate the delay and delay difference of wiring channels in a single simulation, improving simulation efficiency.

The application discloses a kind of RDL copper surface microstructure detailed processing method and system, for the problems such as grain coarsening, high surface roughness, poor process stability of traditional electroplating copper process, the method is realized optimization by four-step core process: first by micro-current cathode electrolytic cleaning, complex acid-based microetching and in-situ reduction complete synergistic pretreatment;Then controlled multi-pulse electroplating is carried out using a specific formula plating solution and "nucleation pulse-relaxation-growth pulse" multi-stage waveform, cooperate with flow field optimization;Subsequently implement in-situ infrared transient thermal annealing;Finally, the process parameters are dynamically adjusted by multi-module online monitoring and AI closed-loop feedback.The application can obtain equiaxed grain structure with an average grain size of <300 nm, the surface roughness of copper layer Ra≤10nm, significantly improve the electrical performance and process robustness (Cpk>1.67), while eliminating the post-polishing / long-time annealing step, optimizing the production cycle and cost, suitable for mass production.

The application discloses a time-varying antenna based on a distributed switch array and a multi-pulse injection control method, and relates to the technical field of antennas. The time-varying antenna comprises a main antenna section with slow wave characteristics, a distributed switch array, a plurality of umbrella-shaped radiation branches and a main control unit. The distributed switch array comprises a plurality of electronic switches, and the output ends of the electronic switches are connected to the umbrella-shaped radiation branches one by one. The main control unit is used for controlling the on-off time sequence of the electronic switches, so that the electronic switches perform a hierarchical trapping action and a global synchronous conduction action. The application discards the waiting mode of a single cycle and a single pulse of a traditional time-varying antenna, and innovatively adopts a slow wave delay and a pipeline trapping (the hierarchical trapping action) scheduling strategy. Without increasing the overall physical size of the antenna, a plurality of high-frequency pulses can be contained and temporarily stored in a single scheduling cycle, and the system transmission power and energy density are significantly improved.

The invention relates to a coagulant accurate adding system based on multi-source perception and AI-digital twinborn fusion, and relates to the technical field of intelligent control, and the coagulant accurate adding system comprises a microfluidic water quality detection module used for carrying out multi-parameter synchronous detection on raw water and outputting multiple paths of water quality voltage signals; the pulse signal generation module is used for converting the multiple paths of water quality voltage signals into multiple paths of pulse width modulation pulse signals; the pulse neural network decision module comprises an input layer, a coagulation response mapping layer, a flocculation effect prediction layer and a dosing amount output layer; the piezoelectric micro-jet execution module comprises a piezoelectric micro-jet array and a piezoelectric driving circuit; the feedback regulation module comprises an on-line turbidity sensor arranged at the water outlet end of the coagulating basin and is used for realizing closed-loop dynamic optimization of the adding amount of the coagulant; according to the invention, the adaptability of the coagulation process to the water quality fluctuation of raw water is effectively improved, the medicament consumption and the sludge yield are reduced, and the stability of the effluent quality is guaranteed.

This invention discloses a high-resolution timing-programmable burst pulse generator based on an embedded processor, which realizes multi-channel, high-precision, and fully programmable burst pulse output for optical module testing. It combines the advantages of low cost, high integration, low power consumption, and high timing accuracy. It includes an embedded processor module, a host computer configuration module, a USB-IIC bridge communication module, and an embedded main control module. The embedded processor module adopts the GD32E5 series chip and has a built-in SHRTIM timer with a DMA burst transfer unit and multiple pulse output channels. The host computer configuration module establishes data interaction with the embedded main control module through the USB-IIC bridge communication module to provide a visual configuration interface and support users to customize the configuration parameters of each pulse signal. The embedded main control module receives and parses the configuration parameters, stores them in the FLASH parameter storage area, and completes the hardware configuration. The system waits for the rising edge of the external AUX signal to trigger the signal throughout the process. After triggering, it synchronously outputs 6 high-precision pulse signals.

This invention relates to a method and system for locating hot cracks in DED thin-walled parts based on multi-source acoustic emission. The method includes: arranging at least three air-coupled acoustic emission (AE) sensors non-collinearly above the DED forming stage, and pre-calibrating the three-dimensional spatial coordinates of each AE sensor; during the layer-by-layer deposition of the thin-walled part, synchronously acquiring acoustic signals radiated into the air when hot cracks initiate using the AE sensors, and preprocessing the acoustic signals; extracting pulse characteristic signals characterizing hot crack initiation from the preprocessed multi-channel acoustic emission signals, and calculating the time difference between multiple pulse characteristic signals acquired by each AE sensor; constructing a spherical wave hyperbolic positioning equation set, and obtaining the height coordinates of the upper surface of the thin-walled part where the hot crack source is located; and calculating the spatial coordinates of the hot crack source based on the three-dimensional spatial coordinates of each AE sensor, the time difference of each pulse characteristic signal, and the height coordinates.

This invention discloses a method, apparatus, and medium for detecting bridge-structured MMC submodules. The method includes: acquiring a first MMC submodule; wherein the first MMC submodule includes a first target switch and a first capacitor; establishing a detection device based on the first MMC submodule; wherein the detection device includes a first switch module, a first DC voltage source, and the first MMC submodule; charging and discharging the first capacitor through the first switch module to heat the first target switch to a preset temperature; acquiring the signal of the first target switch under a preset multi-pulse signal drive to obtain a first detection result. This invention proposes a method, apparatus, and medium for detecting bridge-structured MMC submodules. By heating the first target switch to a preset temperature before detection, accurate detection results can be obtained, thus solving the problem of ineffective detection of switching devices in MMC submodules.

The application provides a detection data acquisition method based on diabetes pulse characteristics, which extracts multiple pulse signal characteristics, realizes multiple pulse characteristic fusion representation according to a fusion strategy, and the fusion representation is the finally obtained pulse diagnosis data. The application extracts pulse characteristics from three different perspectives, obtains a fusion matrix through complementary learning, and realizes the fusion representation of the pulse signal by relying on the fusion matrix. Thus, the application solves the limitation of single pulse characteristic in pulse representation, sets independent projection matrices for various characteristics, projects each characteristic to a public subspace, fully utilizes the complementary information between multiple characteristics, and retains the difference. The representation information in the pulse signal is effectively retained. Meanwhile, the application also provides a detection data acquisition system based on diabetes pulse characteristics.

This application discloses a method and system for determining cross-scale bridges of femtosecond laser process parameters. By establishing a local response library containing small pulse memory states at the nanoscale, and then mapping the local removal response at the nanoscale to the macroscopic pit shape at the micrometer scale through convolutional epitaxy, a quantitative cross-scale correlation can be established between the atomic-scale microscopic removal mechanism captured by dual-temperature-molecular dynamics and the micro-pit morphology and processing mode at the experimental scale without performing full-scale, full-pulse molecular dynamics brute-force calculations. This preserves the interpretability of the microscopic mechanism and can directly inversely obtain the equipment process parameters applicable to actual processing, effectively reducing the experimental cost of femtosecond laser process development, solving the long-standing spatial scale breakage problem of TTM-MD, improving multi-pulse prediction capability, and enhancing the ability to inversely obtain process parameters.

This specification discloses a filtering method and system for ultrasound imaging. The method includes: acquiring multiple pulse Doppler echo signals, with adjacent pulse Doppler echo signals distributed at intervals in the time domain; demodulating the multiple pulse Doppler echo signals to generate discontinuous multi-segment IQ data; for each segment of IQ data: filtering at least a portion of the data points; and recursively filtering the filtered data points and the unfiltered data points to obtain segmented filtered IQ data.

The application discloses a scattering light intensity measurement uncertainty quantification method based on light spot stability analysis, and belongs to the technical field of plasma diagnosis. The method comprises the following steps: collecting a laser light spot image by using a surface array detector; performing adaptive background noise filtering and stray light removal based on connected region analysis on the light spot data to obtain high signal-to-noise ratio light spot intensity distribution data; accurately calculating the light spot centroid position of each pulse by using a weighted centroid method, and statistically analyzing the multi-pulse centroid positions to obtain a beam pointing stability parameter; combining the spatial matching relationship between the scattering volume and the collection system in the Thomson scattering light path to construct a quantitative model between the laser centroid offset and the scattering light collection efficiency, and then calculating the relative uncertainty of the transmission coefficient according to the error transfer principle. The application can effectively quantify the influence of laser pointing instability and light path vibration on the measurement accuracy without changing the original system structure.

The application discloses a radar communication integrated signal optimization method and belongs to the technical field of radar communication integration. The application constructs a multi-pulse OFDM integrated signal model, designs an ICI self-cancellation precoding matrix based on frequency offset and Doppler effect, and suppresses inter-subcarrier interference; meanwhile, an inter-pulse coherent communication sequence is designed by combining Gold sequences and coherent accumulation constraints, so that the multi-pulse phase coherence is ensured. The transmitting end loads the precoded communication information to OFDM subcarriers to generate an integrated signal; the receiving end first performs ICI compensation and coherent accumulation, and then completes detection and demodulation. The application can significantly reduce waveform sidelobes, improve ranging and speed measurement accuracy and weak target detection performance, is compatible with a traditional OFDM structure, and is suitable for high-speed motion scenes such as vehicle-mounted radars and airborne detection.

The application discloses a TDM-MIMO radar moving target detection method based on signal timing design. The application designs signal receiving and transmitting timing, that is, in a scanning period, a certain virtual channel continuously transmits and receives multiple pulses, and the rest of virtual channels only transmit and receive two pulses; pulse accumulation is realized by transmitting and receiving multiple pulses through a certain channel, two pulses are received and transmitted through the rest of channels to shorten the scanning period, and the problems of small non-blurring velocity range and poor detection real-time performance of the TDM-MIMO radar when detecting a moving target are solved. The application estimates the radial distance and radial velocity of a moving target based on the channel signals of continuously transmitting and receiving pulses, compensates the interference phase introduced by the Doppler frequency caused by movement according to the radial velocity estimation value of the target, realizes velocity-azimuth decoupling, and finally estimates the azimuth angle of the target by using a DBF algorithm. The application can consider the non-blurring velocity measurement range and the detection real-time performance, and realizes real-time detection of a moving target.