104 results about "Pulse shaping" patented technology

The invention discloses a system and method for generating, regulating and controlling a partially coherent space-time light field. The system comprises a pulse shaping assembly composed of a plurality of optical elements and an incident light source used for providing a completely coherent ultrafast pulse light field. An optical element in the pulse shaping assembly comprises a first blazed grating, a first cylindrical lens, a two-dimensional dynamic holographic modulator, a second cylindrical lens and a second blazed grating which are sequentially arranged in the light field propagation direction. The focal lengths of the first cylindrical lens and the second cylindrical lens are the same, and the distance between the adjacent optical elements is equal to the focal lengths of the first cylindrical lens and the second cylindrical lens; the two-dimensional dynamic holographic modulator is used for loading a specific complex amplitude modulation function to reconstruct the spatial-spectral characteristics of the light field. According to the invention, the two-dimensional space-spectrum function of the pulse is dynamically modulated, the generation of the partially coherent space-time wave packet is realized, and the amplitude and structure distribution of the space-time coherence can be designed and regulated as required.

The invention relates to the technical field of power system state monitoring, and discloses an insulator defect detection method and device and a storage medium, and the method comprises the steps: collecting the leakage current of an insulator, and constructing a polarity conduction screening model through power frequency phase information, so as to generate a composite current sequence which highlights the polarization attribute of an interface; analyzing the nonlinear degree of the attenuation rate of the sequence drifting along with evolution time in a multi-stage diffusion evolution time domain, and generating an interface electrochemical mass transfer composite index; utilizing the index to invert and construct an interface polarization background reference and stripping the interface polarization background reference from the composite current sequence so as to extract an abnormal discharge pulse residual error; and finally, quantizing the pulse form distortion degree of the residual error, and performing suppression normalization operation on the distortion degree by using the index to output a judgment result. According to the invention, the interference of the interface mass transfer process is effectively eliminated, and the specific detection of the pollution flashover hidden danger is realized.

The invention discloses a traditional Chinese medicine pulse diagnosis instrument based on multi-modal analysis and a detection method thereof.The device is composed of a shell, a master controller and three sets of pulse diagnosis components used for the cun pulse position, the guan pulse position and the chi pulse position, and each pulse diagnosis component integrates an air path sensing module, an optical sensing module and a pressure sensing module; through cooperative work of the pneumatic piston, the liquid annular bag, the thin film pressure sensor and the optical sensor, accurate collection of pulse signals is completed. The system has the automatic locating and fitting function of three-dimensional linkage of the y axis, the theta axis and the z axis, intelligent locating and layered pressurization of wrist pulse positions can be achieved, and the pulse taking manipulation of'lifting, pressing and searching 'of traditional Chinese medicine is simulated. The device synchronously obtains multi-mode signals such as pulse position, pulse rate, pulse law, pulse shape and pulse potential, and after general control filtering, correction and fusion algorithm processing, a standardized feature matrix is formed and input into a multi-mode fusion model for pulse condition classification and automatic dialectical analysis. According to the device, a visual analysis result is generated based on pulse condition characteristics in combination with eight-line syndrome differentiation and viscera syndrome differentiation.

The invention discloses a construction method of a non-acceleration PST Airy wave packet, and relates to the technical field of non-diffraction beams. The method comprises the following steps: defining Lorentz acceleration of a light beam in a PST domain; lorentz acceleration is applied to the light beam of the PST domain parabola-shaped frequency spectrum; superposing a cubic phase on the parabolic frequency spectrum of the PST domain; a non-acceleration PST Airy wave packet is generated by using a complex amplitude modulation method based on a spatial light modulator. Compared with a space-time light pulse scheme needing a pulse laser source, a 4f pulse shaping system and a complex field scanning device, the method achieves efficient generation of the wave packet through simplified configuration.

The application discloses a kind of pulse shaping method and system of nuclear signal, belong to signal processing technical field, for the problems of existing pulse signal width in prior art Widening, thereby increasing the accumulation event, and there is no better anti-noise effect to Gaussian white noise, the present application includes: the output signal of detector is acquired, and output signal is structured into digital function signal;The Z transform is carried out after the discrete of the digital function signal, and output Z transform signal is obtained;Definition input signal is exponential signal, and the Z transform is carried out to the exponential signal, and input Z transform signal is obtained;According to the input Z transform signal and the output Z transform signal, the transfer function of input signal pulse shaping is obtained;The inverse Z transform is carried out to the transfer function, and the pulse shaping signal of input signal is obtained, and its time domain expression.The purpose is: the pulse shaping signal obtained has better signal-to-noise ratio, and it is convenient to obtain amplitude.

1. The name of the design product: digital multi-channel pulse amplitude analyzer. 2. The use of the design product: the main use of the design product is to provide high voltage for the detector, to provide working voltage for the preamplifier, high-precision signal processing and pulse shaping, high-speed data transmission, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: front view.

A power supply modulator circuit includes a multi-output power supply that generates multiple power output signals; at least one power modulator circuit generates a modulated power output signal from the multiple power output signals of the multi-output power supply; at least one pulse shaping network (PSN) having at least one passive element, the PSN configured to shape the modulated power output signal; at least one power amplifier coupled to receive the modulated power signal; and a switching network having a plurality of switches to create or modify power signal paths from the at least one power modulator circuit to the at least one power amplifier.

Methods and apparatus for characterizing an optical fiber link by optical time domain reflectometry are disclosed. In order to solve the problem of trade-off among signal-to-noise ratio, duration and resolution of optical time domain reflectometry, the embodiment of the invention uses a coded return-to-zero optical pulse sequence. Each return-to-zero light pulse in the coded sequence includes a guard interval to mitigate the effects of pulse shape distortion. In some embodiments, the return-to-zero light pulse sequence is encoded with a complementary Gaulay correlation code. Some embodiments provide methods for encoding and decoding a sequence in a return-to-zero pulse sequence. Some embodiments provide an optical time domain reflectometry apparatus including a light source unit, an optical coupler, a light sensor, and a processing device.

The invention relates to the field of environment monitoring and analyzing instruments, and particularly discloses a portable radon detector which comprises a silicon photomultiplier sensor unit, a low-noise preamplifier unit, a comparator circuit and an STM32 main control module. By adopting the EQR-15 series silicon photomultiplier, the 300 [mu] m epoxy resin protective layer on the surface of the EQR-15 series silicon photomultiplier can directly emit light under the bombardment of alpha particles, the advantages of the integration of a photodiode and the high signal amplitude of a scintillator are integrated, and the detection sensitivity and the signal-to-noise ratio are remarkably improved while an independent scintillator is omitted. Aiming at weak current signals, a low-noise pre-amplification circuit with a TL084CDR operational amplifier as a core is designed, and a pulse shaping and emitter follower is arranged, so that the problems of signal amplification and interference resistance are effectively solved. The main control module realizes accurate capture and counting of alpha particle pulses through ADC sampling, hardware triggering and DMA storage in combination with a threshold self-adaption and baseline tracking algorithm.

The application belongs to the technical field of signal processing, and discloses a digital peak-plateau double-channel shaping method and system for processing nuclear pulse signals, wherein the correlation between peak pulse shaping and plateau pulse shaping results is analyzed, and a peak-plateau double-channel shaping method is established; the severity of pulse pile-up is judged by using the peak pulse shaping channel, whether the pulse is reserved is judged, and the position of the pulse is determined; the peak value signal is provided by using the plateau shaping channel, and the pulse amplitude is extracted. The digital pulse amplitude analyzer adopting the peak-plateau double-channel shaping algorithm can identify and reserve the effective pulse amplitude in the pulse pile-up, so that the resolution of the nuclear energy spectrum is improved. The peak-plateau double-channel shaping method can effectively solve the problem of pulse pile-up in the nuclear energy spectrum measurement system, and greatly improves the count rate in the nuclear energy spectrum measurement. The application also has the advantages of high resolution, good shaping linearity and the like.

A method is disclosed for plasma processing of a substrate. The method includes generating a low frequency radiofrequency (RF) signal. The low frequency RF signal has a frequency within a range extending from about 10 kilohertz to about 2 megahertz. The method also includes supplying the low frequency RF signal to a plasma processing chamber. The method also includes controlling a power level of the low frequency RF signal over a duration of a given state within a multi-state plasma processing operation, such that a plurality of different power levels of the low frequency RF signal are supplied to the plasma processing chamber during the given state. The duration of the given state is less than about 25 microseconds.

The application discloses a kind of communication signal parameter blind estimation methods, devices and program products for intelligent instrument, involve signal identification field, to with low complexity calculation cost, accurately estimate the carrier frequency offset value of electromagnetic signal, symbol rate and pulse shaping filter type.The application carries out normalization to received signal, carrier frequency offset rough correction, estimates carrier frequency offset and meets rate, carries out the pre-estimation of pulse shaping filter type from the spectrum diagram of rough correction signal, and, for square root raised cosine filter / Raised cosine filter, first sequentially carrier frequency offset correction is carried out to first signal, based on square root raised cosine filter Matching filter, and based on symbol rate construction constellation diagram, finally according to constellation diagram, distinguish whether square root raised cosine filter or Raised cosine filter.The application realizes comprehensive, accurate, reliable estimation to electromagnetic signal parameter with low calculation complexity, realizes the automation and wisdom of electromagnetic signal measurement.

A controller for a generator includes a feed-forward control module. The feed-forward control module is configured to generate an adjustment curve to control a parameter of the generator according to a desired output signal. The feed-forward control module generates a plurality of adjustment values according to a sub-region of the output signal. Each sub-region includes a portion of a signal to be output.

This invention relates to a covert communication method based on block parameter uncertainty, belonging to the field of wireless communication technology. The method includes: constructing a covert communication model in a multi-user dynamic access scenario and deriving covert communication judgment rules for eavesdroppers; based on the covert communication judgment rules, analyzing the general conditions for covert communication parties to evade hypothesis testing; and based on the general conditions for covert communication parties to evade hypothesis testing, introducing an equivalent power variance under the condition that the interference source uses a pulse-shaping transmission strategy to obtain the optimal transmission power. This invention addresses covert communication scenarios where interference sources exist. Combining block parameter uncertainty, it utilizes the general covert conditions of intersecting manifold spaces and employs a roll-off coefficient to construct an equivalent power model for pulse shaping, achieving the optimal covert communication power for the transmitter.

A system configured to provide a non-thermal plasma from a variety of feed gases is described. The system includes a plasma applicator; a feed gas source providing a gas flow to the plasma applicator; a power supply configured to deliver electrical power via a transmission line to an electrode of the plasma applicator; a signal generator configured to provide a drive signal to the power supply; and a controller. The controller is configured to receive at least one input status parameter associated with a quality of plasma delivered by the plasma applicator; and provide at least one parameter value for at least one parameter defining an output signal waveform of the power supply. The at least one parameter value is taken from the group consisting of: duty factor, pulse rate, pulse width, pulse delay, pulse modulation and pulse shape.

A pulse-shaping network configured for use in a radio frequency (rf) power amplifier system, the pulse-shaping network comprising: a coupled magnetic element comprising a first inductive element magnetically coupled to a second inductive element, the first inductive element comprising a first winding disposed about a first portion of a core, and the second inductive element comprising a second winding disposed about a second portion of a core, wherein the first and second inductive elements are electrically coupled to provide three output terminals of the coupled magnetic element.

The invention relates to the technical field of industrial adaptive control, in particular to a network adaptive pulse synchronization control method and system fused with event triggering, and the method comprises the steps: controlling a plurality of controlled units to execute a carrying task of a target load; identifying the controlled unit to obtain state feedback data; detecting the state of the target load in real time to obtain disturbance feedback data; performing performance index analysis on the disturbance feedback data, and judging whether a preset event triggering condition is met or not; when the event triggering condition is met, self-adaptive pulse control is started; the self-adaptive pulse control comprises the following steps: comparing and analyzing the state feedback data and a preset benchmark reference model, and determining control deviation data; based on the control deviation data, the disturbance feedback data and the state feedback data, self-adaptive parameter optimization is carried out, and control pulse parameters including pulse amplitude, pulse width, pulse shape and cooperative application time are generated; according to the invention, based on the control pulse parameters, synchronous control of a plurality of controlled units is realized.

The application discloses a kind of numerical simulation method and system of saturable absorber mode-locked fiber laser, method includes the following steps: setting simulation parameter;Input a noise pulse as the initial pulse of simulation system;The numerical solution of nonlinear Schrödinger equation is calculated by improved step-by-step Fourier method, and the evolution result that pulse is transmitted in optical fiber is obtained;The shaping effect of saturable absorber to pulse is simulated using the transmissivity function of saturable absorber;Coupler solver redistributes the energy of pulse;Post-processing module saves the data when pulse stops running, and it is drawn into the curve graph and three-dimensional graph of pulse shape and pulse spectrum.The simulation method and system disclosed in the application can solve the problem of low calculation precision of dispersion term in fiber laser simulation, greatly improve the simulation accuracy, and can more accurately predict the output characteristics of mode-locked fiber laser.

A method includes receiving a plurality of laser pulses as a pulse train on a plurality of imaging sensor pixels in an array of pixels. For each pixel in the array of pixels, the method includes receiving a respective one of the laser pulse trains, and scanning the pixels response across a range of frequencies with a bandpass filter to determine pulse shape characteristics of the respective one of the laser pulse trains. The method includes filtering out all of the laser pulse trains that do not fit a predetermined pulse shape characteristic for a true target designation pulse train, and physically adjusting trajectory of a physical resource toward a target based on location on the imaging sensor of one or more pixels receiving a laser pulse train that fits the predetermined pulse shape characteristic for the true target designation pulse train.

Provided are an ultra-wideband transmitter capable of delay-based spectrum shaping and a method of driving same according to an example of the present disclosure. In particular, the ultra-wideband transmitter may comprise: a clock generation unit for generating and outputting at least one clock signal having a predetermined period; a pulse generation unit for receiving the clock signal generated from the clock generation unit and generating a first pulse signal and at least one second pulse signal having a preset frequency band; a pulse shaping unit for shaping the first pulse signal and the at least one second pulse signal to match a transmission scheme; a multiplexer for selecting one of the at least one clock signal on the basis of phase data and outputting a carrier wave; a power amplification unit for amplifying each pulse signal shaped by the pulse shaping unit or a combined pulse signal obtained by combining the shaped pulse signals; and a combination unit disposed before or after the power amplification unit to combine the pulse signals shaped by the pulse shaping unit or the pulse signals amplified by the power amplification unit and output a combined pulse signal.

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.

The application provides a pulse laser and a processing method, comprising: a first oscillator, a pulse shaper and an amplifier; the first oscillator is used for providing a main light beam; the pulse shaper is arranged at an output end of the first oscillator, and is used for modulating the main light beam in a time domain based on a processing depth or shape requirement, so as to generate a seed light beam with a preset pulse width and / or a preset pulse shape; and the amplifier is arranged at an output end of the pulse shaper, and is used for amplifying the seed light beam. The pulse laser and the processing method can realize accurate control of the processing depth, improve the processing speed under the condition of ensuring the processing quality, obtain a large processing depth by using low energy, and further greatly improve the energy utilization rate.

The invention relates to the technical field of measurement and testing, and discloses a pulse ultrasonic sensing device and method for fluid anomaly detection, and the method comprises the steps: a programmable pulse generator in an application-specific integrated circuit generates a short pulse sequence with preset parameters, and the short pulse sequence is amplified by a power amplifier and then is transmitted to a fluid medium by an ultrasonic transducer. In a transmitting gap, the transmitting-receiving switching circuit switches the system to a receiving mode, and echo signals are conditioned through the low-noise preamplifier, the programmable band-pass filter and the automatic gain control circuit in sequence. The conditioned signals are digitalized through an analog-to-digital converter array, pulse shaping, time sequence alignment, signal accumulation and digital filtering operation are carried out in a digital processing module, then signal envelopes are extracted by an envelope detector, feature vectors are calculated, and finally abnormity judgment is carried out by a judgment logic unit. According to the invention, rapid ultrasonic detection and accurate judgment of abnormal signals are effectively realized.

Method for generating a pulse (7, 9; 207, 209; 307, 309; 407, 409), wherein a predetermined first boundary curve (3) and a predetermined second boundary curve (5) are defined for a pulse shape of the pulse (7, 9; 207, 209; 307, 309; 407, 409), wherein the boundary curves (3, 5) describe the time course of a current quantity (I), and wherein the second boundary curve (5) lies completely within the first boundary curve (3), characterized in that a curve inscribed between the boundary curves (3, 5) is generated as the pulse shape for the pulse (7, 9; 207, 209; 307, 309; 407, 409) by means of a current sink (37), which – compared to a rectangular pulse inscribed between the boundary curves (3, 5) – is located in a first region of the current quantity that is away from an extremum. (I) is deformed towards the first limit curve (3), and in a second region of the current quantity (I) facing the extremum is deformed towards the second limit curve (5).

A reusable battery-operated electromagnetic pulse (EMP) generator system comprising a pyroelectric element that accumulates high-voltage charge, immersed in a dielectric bath. A heating element heats the dielectric bath and the pyroelectric element, while a temperature sensor monitors their temperatures. The components are housed within a thermal chamber that provides insulation. A switched pulse actuator controls the rapid discharge of the accumulated charge from the pyroelectric element. The system includes a pulse shaping subsystem, a power supply unit, and a broadband radiating element such as an ultrawideband antenna for emitting the EMP. The pyroelectric element is heated and cooled to control accumulation of high voltage charge, which is discharged as an electrical pulse that is shaped and radiated as EMP.

Systems and methods are described for generating and implementing pulse-shaping filters for efficient utilization of limited spectral resources in wireless communication systems. Wireless communication systems operating at high spectral efficiency conventionally use pulse shaping filters that rely on Nyquist waveforms for good main lobe performance with low inter-symbol interference (ISI) power. Conventional uses of non-Nyquist waveforms typically involve an orthogonalization process to convert those non-Nyquist waveforms to Nyquist waveforms for ISI free performance. Embodiments of pulse shaping filters described herein generate a non-Nyquist partial response (NNPR) transmit filter and / or matched receive filter based on applying a tunable second-weighted orthogonalization to a tunable first-weighted non-Nyquist waveform to obtain a pulse-shaping waveform with parametric control over throughput and power penalty.

The application relates to a kind of air-based asynchronous communication multi-user transmitter design methods, belong to wireless communication technical field, method includes: constructing air-based uplink asynchronous communication system model, base station received signal is characterized as each user time delay and channel weighted codebook coded pulse shaping signal superposition;Received signal is decomposed into target signal, multi-symbol asynchronous interference and effective noise, the signal-to-noise ratio of each user is determined;With the minimum signal-to-noise ratio in all users as the target, with code word power normalization as the constraint condition, the codebook optimization problem of transmitting signal is constructed;Meta-learning algorithm is used to construct task space with time delay information for offline pre-training to obtain meta-model;In the online stage, the current time delay is input, and the adaptive codebook is quickly generated through the meta-model, and the codebook is used for the transmitter to encode the sending symbol to generate the transmitting signal.The application improves the signal-to-noise ratio of multi-user received signal, thereby realizing the reliability of wide-area asynchronous communication of unmanned aerial vehicle.

The application discloses a pulse ultrafast measurement system based on a time domain amplification method, comprising a reference pulse generation device, wherein the reference pulse generation device is sequentially connected with a first dispersion compensation optical fiber, a first power amplification device and a pulse shaping device; the pulse shaping device is connected with a light combiner; the light combiner is sequentially connected with a high nonlinear optical fiber, a first filter, a third dispersion compensation optical fiber, a second power amplification device and a first oscilloscope; the application further comprises a signal to be measured, wherein the signal to be measured is connected with a second dispersion compensation optical fiber, and the second dispersion compensation optical fiber is connected with the light combiner; the application further discloses a pulse ultrafast measurement method based on the time domain amplification method.

The invention relates to an inductive charging device comprising a first energy coil, a positioning device, and a control device for generating a control current to control the at least one transmitting coil of the positioning device. The control device is configured to generate the control current by receiving or generating an AC signal with a carrier frequency, pulse shaping, and amplitude modulation of the AC signal to generate an amplitude-modulated AC signal by multiplication with a pulse signal and filtering to attenuate harmonics of the amplitude-modulated AC signal.

The invention relates to a grain cleaning loss real-time monitoring system, and belongs to the technical field of grain processing, and the system comprises a piezoelectric sensing matrix which is used for sensing grain collision and generating a charge signal; wherein the piezoelectric sensing matrix comprises a plurality of piezoelectric sensors which are uniformly distributed on the screen surface of the combine harvester in a matrix form, and the detection range of the piezoelectric sensing matrix covers the whole screen surface of the combine harvester; the signal processing circuit is electrically connected with the piezoelectric sensing matrix and is used for performing amplification and frequency selection on the charge signal to extract a grain collision characteristic signal of a preset frequency band and performing pulse shaping to output a level signal; and the main controller is electrically connected with the signal processing circuit and is used for carrying out frequency domain energy analysis on the level signal and determining the output grain mass loss M for a worker to know. The grain cleaning loss monitoring device has the effect of realizing high-sensitivity and high-reliability grain cleaning loss monitoring.