73 results about "Single pulse" patented technology

A layered pulse generator for a vertical-cavity surface-emitting laser (“VCSEL”) driver is disclosed consisting of three elements: a low-speed pulse generator, a high-speed pulse generator, and a pulse generator selector, all of which are on-chip with the VCSEL driver. By providing these elements on-chip, overall system power and complexity are reduced while allowing for significantly higher pulse train frequencies compared with known systems. The high-speed pulse generator is capable of generating pulses faster and with higher resolution than that of the low-speed pulse generator. The high-speed pulse generator uses multiple clock outputs, phase shifted, and synthesized into a single pulse waveform capable of wide-ranging frequencies, duty cycles and pulse counts.

The present application relates to radar signal processing technical field, specifically provide a kind of staggered pulse repetition interval time-frequency domain dual-polarized radar detection variable estimation method, comprising: in frequency domain, the estimation of echo signal-to-noise ratio, reflectivity factor, differential reflectivity of horizontal / vertical polarization based on power spectral density;And the estimation of average Doppler velocity and velocity spectrum width;In time domain, after ground clutter filtering based on odd-even pulse, respectively, odd-even pulse correlation parameter estimation is carried out, so that two detection variables of dual-polarized radar correlation coefficient and differential propagation phase shift of odd-even pulse are obtained respectively, then odd-even combination can obtain the estimation result of accurate correlation coefficient and differential propagation phase shift.The present application realizes the accurate estimation of dual-polarized radar multi-class detection variable, ensures that estimation result is not disturbed by ground clutter interference, simultaneously adapts single pulse repetition interval and staggered pulse repetition interval two working modes, improves the reliability and applicability of radar detection.

A radiation detector that suppress a double count which occurs by detecting a single pulse duplicately with a plurality of counters in counter switching, and can acquire highly accurate data, is configured to detect radiation in continuous exposure, comprises a sensor for generating a pulse when a particle of radiation is detected, a plurality of counters provided for counting the pulses, a setting holding circuit for holding a setting of an off-time for turning off any of the plurality of counters, and a control circuit for switching the counter performing counting the pulses after a lapse of the off-time with respect to a trigger signal.

The application discloses a kind of scintillator decay time test methods based on waveform sampling, the steps of test method include: scintillator is coupled to the optical window of photomultiplier tube placed in shielding box, using radioactive source excitation sample, open oscilloscope automatic acquisition not less than 100 pulse signals and transmission to control computer;Pulse waveform data acquired by oscilloscope is handled calculation, obtains the decay time constant corresponding to single pulse data;The above steps are repeated for processing all collected pulse data, obtain decay time constant set;With decay time constant set histogram, data should present normal distribution;Using Gaussian function to the normal distribution is fitted, the decay time value corresponding to the peak obtained is the decay time of the sample.The application can accurately test the decay time of different scintillating materials, especially suitable for high-throughput decay time measurement.

The application discloses a kind of three-dimensional radar low altitude multipath detection and elevation dynamic measurement method of double channel, and the adaptive decision threshold of multipath decision model is constructed in combination with real-time signal-to-noise ratio, so that the judgment of target echo complex signal can be accurately identified the occurrence and end of multipath interference like " switch ", when target echo is interfered by multipath, start the elevation measurement method for multipath interference, significantly improve the environmental adaptability and robustness of radar;The imaginary part characteristics of complex single pulse ratio are used in combination with the adaptive threshold of signal-to-noise ratio, which is more accurate than the simple distance threshold in identifying the multipath state, with higher detection accuracy.The application uses the characteristics that phase information is distorted but still maintains segmented monotonicity under multipath environment, first locks the subdivided monotonic interval where the target is located, and then uses high-sensitivity amplitude information to perform table lookup inversion in the interval, without changing the 1T2R hardware architecture, the problem of angle measurement error caused by multipath interference is solved.

This invention provides a method for eliminating bonding interface defects, a module for eliminating bonding interface defects, a semiconductor device processing apparatus, and a computer-readable storage medium. The method for eliminating bonding interface defects includes the following steps: locating at least one bubble defect on the bonding interface of a grain-wafer bond; and applying a pulsed high-energy beam from the grain side of the bonding interface to the at least one bubble defect to form at least one venting micro-via penetrating the corresponding grain above the bubble defect, wherein the peak power of the pulsed high-energy beam is not less than 10 kW, and its single-pulse energy is not greater than 1 mJ.

The application provides a method for analyzing a 4H-SiC femtosecond laser processing optimal energy interval, and belongs to the technical field of engineering optics based on computer data processing. First, the evolution of electron density, lattice temperature and electron temperature under irradiation is simulated by constructing a three-dimensional model and an electron density cumulative rate equation and a double-temperature model, so that the lattice modification threshold and the ablation threshold are determined. Then, a plurality of experimental data points are selected in the interval for single-pulse laser processing, the surface morphology, removal depth and removal radius of each data point are counted by using conventional characterization methods, and the accuracy and non-thermal removal threshold of the model are determined by observing the number of surface spatter particles and the flux calculation of the morphology edge. Further, the optimal structure modification energy interval, cold processing interval and hot ablation processing interval of 4H-SiC are determined. The application uses fewer sample damage test times, improves the sample utilization rate, shortens the research period, and accelerates the flux screening of the optimal laser processing.

The application discloses an anti-interference frame synchronization method in high-speed frequency hopping communication, equipment and medium, the anti-interference frame synchronization method in high-speed frequency hopping communication includes: combining interference detection based on communication receiving end and single synchronization pulse correlation value multi-feature joint decision, constantly interference detection is carried out to receiving end synchronization pulse signal, and the position of interference point is marked, according to the number of non-interference marked points in synchronization pulse and the synchronization correlation value calculated from non-interference marked points and the threshold value set, multi-feature joint decision is carried out, to carry out error correction processing to the correlation value of current pulse, and the accumulation of multiple synchronization pulse correlation values, by setting reasonable threshold, the correct frame synchronization position is finally detected. The application can be in the case where interference exists, through interference detection and single pulse correlation value multi-feature joint decision technology, can realize the great improvement of anti-interference frame synchronization performance under the premise of not increasing additional resources.

This invention discloses a high-repetition-rate interpolation amplification system, relating to the field of high-power laser technology. It employs a three-stage architecture of time-domain separation, parallel amplification, and polarization beam combining. The core idea is to distribute the thermal load and suppress the accumulation of nonlinear effects by interleaving pulses in the time domain, and then synergistically improve the overall performance of the system through incoherent polarization beam combining. Compared with traditional coherent combining schemes, this invention completely eliminates the dependence on precise phase control, extremely high synchronization accuracy, and strict waveform matching, thus providing a highly promising technical path for synchronously achieving high repetition rate, high single-pulse energy, and high average power laser output.

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.

This invention belongs to the field of laser processing, specifically relating to a method for preparing concentric ring micropores using a femtosecond Bessel beam for polymer thin films. The method includes: guiding a Bessel beam, consisting of a central core and multiple concentric rings surrounding it, onto the surface of a polymer thin film deposited on a transparent substrate; adjusting the single-pulse energy to selectively activate the central core of the Bessel beam, or a combination including the central core and one or more peripheral concentric rings, such that the energy density of the activated region exceeds the ablation threshold of the polymer thin film, thereby forming a micropore in the polymer thin film under the action of a single pulse; wherein the pore size of the micropore is determined by the activated central core or the combination thereof, and the micropore is a low aspect ratio hole with a depth substantially equal to the thickness of the polymer thin film, without damaging the transparent substrate. By controlling the activation of the concentric rings of the Bessel beam, the pore size and shape characteristics can be regulated.

This invention relates to a method for identifying abnormal waveforms of partial discharge pulse groups based on a trigger threshold moving window, comprising: Step 1, calculating the average amplitude of a points at the beginning and b points at the end of the recorded waveform to obtain the reference offset value of the recorded waveform; Step 2, removing the reference offset value from the recorded waveform to form a processed waveform; Step 3, establishing an adjustable-duration trigger threshold moving window based on the trigger threshold Yz, and calculating the time standard deviation T and frequency standard deviation B of the data within the moving window when the absolute amplitude within the moving window is greater than or equal to Yz / m, and recording the extreme values ​​and corresponding positions when T×B≥1; Step 4, when the number of extreme values ​​k... j When the value is greater than 1, the time-domain waveform of the currently recorded single pulse is judged as an abnormal waveform; when the number of extreme values ​​k j When the value equals 1, the time-domain waveform of the currently recorded single pulse is determined to be a normal waveform. Compared with the prior art, the present invention has advantages such as good robustness.

The application discloses a kind of based on multi-dimensional domain feature analysis interference suppression method and device, it is related to radar signal processing technical field, wherein, the method includes: different airspace multi-beam carries out frequency domain, time-frequency domain feature extraction, adaptive threshold calculation, interference mask positioning, interference time domain cancellation, engineering integrated application;It uses single pulse level processing, does not change the original signal processing procedure of radar, can be embedded in radar signal processing link in real time;The application is mainly used to solve the detection and suppression of radar main lobe interference, especially in radar game anti-interference field, real-time is high, interference cancellation effect is good, and it is very easy to engineering integration, suitable for different interference countermeasure scene such as narrow pulse, deception false target, dense false target.

The application discloses a kind of multi-level pore structure aerogel based on pulsed laser and preparation method and application, belong to solar energy conversion and utilization technical field.It is inorganic material containing silicon nano as freezing base element, biomass polymer is crosslinking agent, deionized water is solvent, three are uniformly mixed and stand to form hydrogel after solidification, then freeze to form ice crystal, then remove ice crystal to form micron-nanometer level porous aerogel using freeze drying technology;Finally, the micron-nanometer level aerogel obtained is customized punched using pulsed laser technology Millimeter hole, finally obtain millimeter-micron-nanometer multi-level pore aerogel.The application first uses the high single-pulse energy of laser, and the customization optimization regulation and control of millimeter level hole of aerogel is not limited by the size and shape of template, and only through simple programming can realize the diversified design of millimeter hole, which is simple, stable in process and good in reproducibility.

The application provides a magnetron filament demotion method and device, computer equipment and a storage medium, relates to the technical field of medical instrument control, and determines an initial treatment plan based on a single pulse dose by acquiring treatment demand information and calibration parameters of a magnetron, and further predicts the magnetron input average power corresponding to each treatment stage, determines a filament demotion scheme on this basis, and performs cyclic iteration on the initial treatment plan in combination with a demotion stability index, so as to obtain a target demotion scheme and a target treatment plan. Therefore, the filament demotion strategy matched with each treatment stage can be determined in advance before radiotherapy starts, the hysteresis caused by the demotion control based on the current state or the state at the last moment in the prior art is reduced, the filament demotion is better adapted to the dynamically changing treatment plan, the stability of the magnetron operation is improved, and the service life of the magnetron is prolonged.

This invention discloses a high-voltage nanosecond pulse shaping device and method based on magnetic devices. The device includes: a first magnetic transmission line and a second magnetic transmission line, with their input ends connected in parallel and connected to an initial pulse source; the output end of the first magnetic transmission line is connected to a load terminal; the output end of the second magnetic transmission line is short-circuited to ground; the first magnetic transmission line includes a first magnetic ring arranged along the axial direction and an outer magnetic field coil; the second magnetic transmission line includes a second magnetic ring arranged along the axial direction. Based on the current-dependent nonlinear permeability effect of the magnetic ring, this device simultaneously achieves pulse rise time compression, fall time truncation, pulse width shortening, and suppression of pre-pulse and tail oscillations through the rising sharpening effect of the first magnetic transmission line and the falling truncation effect of the second magnetic transmission line. This overcomes the limitation of single nonlinear transmission line or magnetic switching technology, which can only optimize single pulse parameters, and can obtain high-quality pulse waveforms at the load terminal.

This invention discloses a wafer laser grooving method and system, comprising: a laser beam being adapted to a spatial light modulator via optical path adjustment; the spatial light modulator loading a rectangular phase map to form a main light spot, with a high-frequency modulation pattern superimposed on the edge; the grooving width being adjusted by rotating the main light spot angle; a 4F system filtering the spectrum and reconstructing a composite light field containing the main light spot and two auxiliary sub-light spots; single-pulse staged operation, with the spatial light modulator synchronously controlling the light spot parameters; after focusing by the objective lens, the main light spot cuts the groove, and the auxiliary sub-light spots soften the edge. This invention solves the problems of poor edge quality and low efficiency of traditional methods, improving grooving accuracy, edge quality, and efficiency, and is suitable for high-precision wafer processing.

The utility model relates to four program femtosecond laser compressor, through the light of first time through the compressor output is injected into the compressor for many times, incident chirp pulse is along the compressor light path and is emitted four times, total transmission grating 8 times, finally through the output mirror output completes compression output, make the number of times of light beam through grating increase to 16 times, make the same grating aperture and grating spacing compressor dispersion quantity turn 4 times, adapt to bigger spread width or bigger bandwidth chirp pulse amplifier, many times repeat, expand the use number of times of compression grating, obtain bigger compression under the condition that the grating spacing of compressor is unchangeable, can be compatible with bigger spread width of chirp pulse amplifier, solve the problem of design limit of chirp pulse amplifier, promote femtosecond laser output single pulse energy.

This invention discloses a millimeter-wave high-amplitude and phase-coherent single-pulse sum-difference network, belonging to the field of single-pulse radar. The sum-difference network is a symmetrical planar structure, including two first-order planar magic-Ts, two second-order planar magic-Ts, two 90° twisted waveguides, four 90° waveguide turning structures, and an electromagnetic bandgap structure disposed around the network. The first-order and second-order planar magic-Ts are identical planar magic-Ts, composed of an H-plane power divider and an E-plane waveguide. The electromagnetic bandgap structure includes an interleaved slot electromagnetic bandgap structure and a metal pillar electromagnetic bandgap structure. This invention employs an integrated planar structure, requiring only one-time processing and assembly, significantly reducing processing and assembly errors. Simultaneously, the planar magic-Ts are designed to effectively avoid the inherent dispersion defects of bridges and phase shifters, achieving high amplitude and phase coherence over a wide bandwidth. Furthermore, the use of a hybrid electromagnetic bandgap structure reduces the fabrication difficulty of the device while preventing electromagnetic leakage.

This invention provides a gradient heating control method and system for a diamond HPHT synthesis cavity. The method includes real-time acquisition of current, voltage, displacement, and outer wall temperature data during the cavity's heating process; calculation of input power, cumulative input heat, power fluctuation rate, and displacement change rate; construction of a compaction discrimination quantity; and division of the heating process into four stages: loading coupling, compaction transition, stable heating, and heat preservation connection. In the loading coupling stage, a first constraint quantity is constructed based on the power fluctuation rate and the outer wall temperature slope; if a threshold is exceeded, the pulse energizing interval and single pulse energy are adjusted. In the compaction transition stage, a second constraint quantity is constructed based on the voltage-current ratio dispersion and displacement change rate; the on / off duration ratio is adjusted according to conditions. In the stable heating stage, the converted internal temperature of the cavity is estimated, and the temperature rise deviation and thermal inertia are combined to match the segmented slope control parameters. In the heat preservation connection stage, multiple factors are integrated to generate a final correction quantity, adjusting the input power range and cycle length, and outputting heating control commands for each stage.

The present invention relates to an imaging spectrometer (10) comprising: - an entrance slit (11) for receiving radiation over a range of wavelengths, - an image detector resolved in two directions, - a spherical mirror (12) with focus F positioned opposite said entrance slit (11), said entrance slit (11) being positioned at the focus F of said spherical mirror (12), - a spectrally dispersive optical assembly (17) for dispersing said radiation as a function of wavelength and focusing it into a detection plane of the image detector, - an extraction mirror (16) for directing the radiation from the spherical mirror (12) onto the spectrally dispersive optical assembly (17), said entrance slit (11) and said spherical mirror (12) being arranged so that the radiation is incident on said spherical mirror (12) at an angle of incidence between ]0.8°], or more preferably ]0.2°]. and even more preferentially around or equal to 1°.

The application discloses a hysteresis detection device and method of electronic expansion valve, comprising the following detection steps: step S1: origin reset and sealing verification; step S2: forward stroke detection: S21: point-by-point driving increases the opening of the electronic expansion valve; S22: setting the global value Pset of the inlet pressure of the electronic expansion valve, adjusting the measured inlet pressure value Pmeas of the electronic expansion valve of each pulse detection point to approach the pressure global value Pset; S23: correcting the pulse number of a single pulse point; S24: recording the forward output flow value corresponding to each pulse point; step S3: reverse stroke detection: recording the reverse output flow value corresponding to each pulse point; step S4: according to the forward output flow value and the reverse output flow value corresponding to each pulse point, calculating the hysteresis value of each preset detection pulse point. The application provides a hysteresis detection device and method of electronic expansion valve, and improves the hysteresis detection precision.

This application provides a pulse generation circuit, apparatus, and method. A coordinated pulse, comprising high-voltage pulses and / or low-voltage pulses, is formed by controlling a high-voltage pulse module to transmit high-voltage pulses and a low-voltage pulse module to transmit low-voltage pulses. Thus, a single pulse generation circuit can generate both high-voltage and / or low-voltage pulses without requiring additional equipment. The coordinated pulse output by the pulse generation circuit includes both high-voltage and low-voltage pulses, expanding the voltage range of the output pulses. This allows the pulse generation device to simultaneously achieve the effects of both high-voltage and low-voltage pulses. Furthermore, the proportion and combination of high-voltage and low-voltage pulses output by the pulse generation device can be adjusted via a coordinated pulse control signal, ensuring the flexibility of the coordinated pulse output by the pulse generation circuit.

The present invention provides a single-pulse converging shock wave system. The system comprises: a gas source, wherein the gas source is configured to provide a test gas; and a converging shock wave pipe, comprising: a shock wave attenuation device, wherein the test gas enters the shock wave attenuation device, then an incident shock wave is formed, the incident shock wave forms a reflected shock wave under the action of reflection, and the reflected shock wave is reflected and attenuated in the shock wave attenuation device, such that the shock wave attenuation device outputs the test gas and incident shock wave having undergone reflection and attenuation treatment; and a parameter measurement device configured to perform parameter measurement on the test gas and incident shock wave having undergone reflection and attenuation treatment, wherein parameter measurement involves at least one of pressure information, flame morphology, and combustion characteristics.

This invention discloses a laser marking method for crystal oscillator circuits, comprising: Step 1: fixing the crystal oscillator to be marked; Step 2: obtaining the coordinates of the area to be marked on the crystal oscillator; Step 3: using a laser at a first preset power to etch and remove the marking layer on the crystal oscillator according to the obtained coordinates; Step 4: using a laser at a second preset power to etch the circuit layer on the crystal oscillator according to the obtained coordinates, and capturing the spectral / acoustic characteristics of the etching product in real time. When it is detected that the nickel layer is about to be etched through, the laser is controlled to etch intermittently in a single-pulse manner until a preset adjustment amount is reached, and then the etching is stopped to complete the marking. This invention utilizes the high absorption rate of 355nm ultraviolet light to metals and the high transmittance of quartz, combined with picosecond ultrashort pulses, to directly vaporize and sublimate the metal material, achieving coating etching without damaging the quartz substrate; the heat-affected zone is strictly controlled within 2μm, completely eliminating burrs and recast layers.

The present invention relates to a hybrid wired / wireless lighting dimming control system using a set / reset latch method, and more specifically, to a hybrid wired / wireless lighting dimming control system using a set / reset latch method that significantly improves the stability and reliability of lighting control independently of the communication status by introducing a method of commanding the lighting state with a single pulse signal and permanently fixing (latching) the corresponding state within the control device to solve the lighting instability and flickering problems that occur in the event of communication failures in conventional continuous signal control methods. Through this, unlike conventional technology which relied on continuous control signals and caused the lighting to become unstable or flicker upon communication interruption, the dimming control command is transmitted as a single pulse signal, and the state is permanently latched and maintained within the dimming controller. As a result, even if the communication connection between the transmitter and receiver is temporarily interrupted, the lighting can stably maintain the last commanded brightness level or ON / OFF state.

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.

This invention relates to the field of laser processing technology, specifically to a time-series ultrafast laser lift-off method and system for silicon carbide wafers. The method includes selecting a silicon carbide single-crystal wafer and fixing it at the processing position; emitting an ultrafast laser pulse with a preset total energy and pulse width; dividing the ultrafast laser pulse into at least eight sub-pulses in the time domain to form a sub-pulse sequence; adjusting the energy of the sub-pulse sequence until the peak power of each sub-pulse is lower than the self-focusing critical power threshold of the silicon carbide single-crystal wafer under single-pulse action; focusing the energy-adjusted sub-pulse sequence onto the interior of the wafer to form a single-layer modified region; controlling the movement of the focused spot to expand into a continuous modified lift-off layer; and applying stress along the lift-off layer to separate the wafer into the peeled wafer and the remaining wafer. This invention can suppress vertical deep damage caused by self-focusing, achieve extremely low material loss, and realize rapid, easy, and high-quality wafer separation.

This invention provides a U-band high-energy square-wave pulsed Raman light source module. It first achieves initial stable amplification of the seed light through forward pumping with a 100-watt pump source, followed by high-energy main amplification through reverse pumping with a kilowatt-level pump source. Both stages of Raman amplification utilize highly nonlinear optical fibers as the gain medium to significantly enhance the stimulated Raman scattering effect, efficiently converting pump light energy into signal light and improving overall Raman gain and energy conversion efficiency. Simultaneously, it balances the stability of the amplification process with the integrity of the pulse waveform, thereby achieving a smooth, step-by-step amplification of the U-band pulsed seed light. Ultimately, it stably outputs high-energy U-band square-wave pulsed light with a single pulse energy ≥5μJ and a pulse width of 80–120ns, significantly improving the light source's output performance and better meeting the application requirements of long-distance fiber optic communication expansion and atmospheric methane remote sensing.