56 results about "Pulse delay" patented technology

The invention relates to the technical field of signal processing, in particular to a radar antenna signal processing method and system, and the method comprises the following steps: collecting an antenna time domain echo extraction channel energy curve, calculating the initial phase attenuation curvature of a period length energy peak value, and building an interference characteristic parameter set; matching real-time echoes, judging homology, eliminating interference, extracting main echoes, extracting main peak position spacing through frequency spectrum transformation, calculating a judgment threshold, comparing, and judging and executing decoupling operation to obtain target frequency spectrum data. According to the method, by extracting Doppler channel coherent energy distribution and establishing a periodic interference characteristic parameter set, the intrinsic characteristics of periodic interference can be accurately described, rapid judgment and effective stripping of interference source homology are achieved, and by analyzing the Doppler center frequency change trend and generating a pulse delay compensation quantized value, the interference source homology can be quickly judged and effectively stripped. The stable target identification and frequency decoupling operation under the interference background is realized, and the target identification and frequency control level in the variable environment is obviously enhanced.

The invention provides a geographic information surveying and mapping data processing method and system, and the method comprises the steps: obtaining terrain superpixels, carrying out the segmentation operation of the terrain superpixels, obtaining terrain superpixel blocks, carrying out the pulse frequency coding operation of the terrain superpixel blocks, obtaining a pulse frequency sequence, and carrying out the pulse delay coding operation of the terrain superpixel blocks. The method comprises the steps of obtaining a pulse frequency sequence, obtaining a pulse delay sequence, adjusting pulse density through terrain superpixels, obtaining pulse density, carrying out feature integration on the pulse frequency sequence, the pulse delay sequence and the pulse density, and obtaining a structured feature tensor. The method comprises the following steps: obtaining original point cloud data, carrying out position calibration on the original point cloud data through equipment movement track data, carrying out feature extraction on original point cloud according to a structured feature tensor, obtaining a terrain block map with a classification label, and improving the accuracy of geographic information surveying and mapping data while ensuring terrain continuity.

The invention relates to the technical field of laser splitting, and provides a dual-laser synchronous coaxial modified stripping device which comprises a mobile platform, a first pulse laser system, a second pulse laser system and a pulse delay regulation and control system, the moving platform can move the to-be-stripped part along a plurality of different directions; the first pulse laser system emits ultrashort pulse laser to the to-be-stripped part through a first light path, so that an initial modified layer is formed in the to-be-stripped part; the second pulse laser system synchronously emits continuous laser to the to-be-stripped part through a second light path, so that the initial modified layer is heated to form a cracked complete modified layer; the pulse delay regulation and control system is arranged in the first light path and comprises a plurality of regulation and control parts which are arranged in the first light path at intervals in the same straight line direction; and the plurality of regulation and control parts are used for enabling the ultrashort pulse laser irradiated in the pulse delay regulation and control system to form at least two different optical path differences, and mutually interfere in the pulse delay regulation and control system to form pulse delay.

Systems, devices, and methods described herein relate to generation and delivery of pulsed waveforms, e.g., for therapy delivery in soft tissue ablation procedures. In some embodiments, a pulse generator is configured to generate a voltage pulse train including a plurality of biphasic pulses, each biphasic pulse of the plurality of biphasic pulses including a positive pulse, a negative pulse, and an inter-phase delay separating the positive pulse and the negative pulse. In some embodiments, successive biphasic pulses of the plurality of biphasic pulses can be separated by a pulse-to-pulse delay such that the plurality of biphasic pulses is separated by a plurality of pulse-to-pulse delays, and the plurality of pulse-to-pulse delays can include increasing or decreasing sequences of pulse-to-pulse delays.

The application discloses a kind of delay pulse generation device, method and electronic equipment based on FPGA chip, field programmable gate array FPGA chip has M delay units, the device includes: clock generation module, for generating reference clock, output clock and delay clock;Pulse generation module, for generating first output pulse according to reference clock;Delay adjustment module, for first output pulse is delayed adjustment according to delay clock, obtains second output pulse, wherein, delay adjustment module includes N delay units, N is less than or equal to M positive integer;And serial conversion module, for second output pulse is converted into parallel according to reference clock and output clock, and output delay pulse sequence.The device is based on FPGA chip internal logic to realize sub-nanosecond delay adjustment, generates sub-nanosecond delay pulse sequence, and the requirement level of peripheral circuit is low, with the advantages of low cost, simple structure, easy to realize.

The invention relates to the technical field of all-solid-state lasers, and particularly provides a master-slave pulse delay controllable ultraviolet dual-wavelength double-pulse laser, which comprises a pumping source and a V-shaped folded resonant cavity, and is characterized in that the V-shaped folded resonant cavity comprises an input mirror, a gain medium, a Q-switched crystal, a total reflective mirror, a frequency doubling crystal and an output mirror; wherein the Q-switched crystal performs step-type modulation through a double-step electric signal, the double-step electric signal sequentially comprises a high-voltage stage, a low-voltage stage and a voltage-reducing stage in a modulation period, and the double-step electric signal sequentially generates jump from the high-voltage stage to the low-voltage stage and jump from the low-voltage stage to the voltage-reducing stage in a pumping period. The dual-wavelength master pulse and the dual-wavelength slave pulse are respectively output, and the time delay between the dual-wavelength master pulse and the dual-wavelength slave pulse can be controlled by adjusting the duration of the low-voltage phase. According to the invention, ultraviolet dual-wavelength double-pulse output is realized, and master-slave pulse delay is flexible and controllable.

The invention provides a double-pulse laser engraving method and device, and relates to the technical field of laser engraving, the double-pulse laser engraving method and device are used for engraving a gravure forme.The engraving method comprises the steps that the wavelength of femtosecond pulse laser and the wavelength of picosecond pulse laser are determined; determining the pulse delay of the femtosecond pulse laser and the picosecond pulse laser; determining a to-be-engraved area of the gravure plate; adjusting the optical path length of the femtosecond pulse laser and / or the picosecond pulse laser according to the pulse delay; synthesizing the femtosecond pulse laser and the picosecond pulse laser into double-pulse laser by using a polarization beam splitting cube; and ablating the to-be-engraved area according to the double-pulse laser. The femtosecond pulse laser is short in wavelength and high in energy, so that a to-be-engraved area can be pre-ablated quickly, when ungasified plasma is formed in the pre-ablated area, the picosecond pulse laser is used for performing secondary ablation on the pre-ablated area, the machining quality of the gravure plate can be guaranteed, the area of a heat affected area can be controlled, and the etching precision of an etched pattern can be improved.

Waveform characteristics of pulses in a pulse train configured to cause pulsed field tissue ablation may be varied in a manner that improves electromagnetic compatibility while retaining treatment efficacy. Such waveform characteristics may include pulse-to-pulse initiation intervals, inter-pulse delays, pulse on-times, pulse widths, inter-phase delays in the case of biphasic pulses, or a combination thereof. Such waveform characteristics may be varied in a random manner. Variations of waveform characteristics may be bounded by minimum, maximum, or both minimum and maximum differences between various pulses or pulse groups, or between various pulse trains or pulse train groups, for example, to help ensure sufficient stability of treatment signal waveforms while allowing sufficient variability, for example, to improve electromagnetic compatibility.

Provided herein are systems, devices, and methods for delivering electroporation energy to treat target tissue. The system includes a generator for providing an electroporation waveform. The generator includes a signal generator for generating the electroporation waveform and a controller for providing signaling that causes the signal generator to generate the electroporation waveform. The system further includes a catheter including at least one catheter electrode. The signal generator provides the electroporation waveform to the at least one catheter electrode. The electroporation waveform includes a plurality of energy pulses, and each energy pulse is separated by an inter-pulse delay period.

A pulse control device and laser processing system including the same are applicable for a plurality of seed laser drivers. The pulse control device includes a plurality of pulse generation circuits and a pulse delay adjustment circuit. The pulse generation circuits are configured to generate a plurality of pulse signals according to a plurality of pulse setting data, respectively, and each of the plurality of pulse setting data at least includes a pulse frequency. The pulse delay adjustment circuit is connected to the pulse generation circuits and configured to control an interval time between the pulse signals according to a reference signal, and outputs a plurality of adjusted pulse signals to the seed laser drivers, respectively. The reference signal is one of pulse signals or a standard signal, and duration corresponding to the pulse frequency in each of the plurality of pulse setting data is different from the interval time.

Systems, devices, and methods described herein relate to generation and delivery of pulsed waveforms, e.g., for therapy delivery in soft tissue ablation procedures. In some embodiments, a pulse generator is configured to generate a voltage pulse train including a plurality of biphasic pulses, each biphasic pulse of the plurality of biphasic pulses including a positive pulse, a negative pulse, and an inter-phase delay separating the positive pulse and the negative pulse. In some embodiments, successive biphasic pulses of the plurality of biphasic pulses can be separated by a pulse-to-pulse delay such that the plurality of biphasic pulses is separated by a plurality of pulse-to-pulse delays, and the plurality of pulse-to-pulse delays can include increasing or decreasing sequences of pulse-to-pulse delays.

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.

The invention relates to a pulse delay automatic gain control method, which comprises the following steps of: determining an attenuation initial value under each power configuration after starting up according to a self-checking signal and a current environment temperature; the input radio frequency signal and the output radio frequency signal are detected in real time in the detection channel, peak value reading is carried out, and the signal amplitude is judged; reading an initial attenuation value of the current environment temperature under the current input signal, calculating a theoretical optimal gain value according to the detected output signal amplitude and the expected target output amplitude, and preferentially using the value to carry out power control; detecting whether a pulse signal arrives or not, if the difference between the current power and the target power exceeds an error threshold value, after the current pulse signal is ended or the longest signal period is ended, calculating a new gain control value according to the relationship among the attenuator characteristics, the voltage and the power, and performing amplification or attenuation processing on the output signal by adopting the new gain control value, and signals with stable amplitude are output. According to the invention, rapid and undistorted gain control of the pulse signal is realized.

The present application relates to a kind of electrode surface electrocatalysis process detection system based on transient raman spectrum, belong to raman spectrum technical field.It includes circuit part and transient raman spectrum test part, wherein circuit part includes signal generator, electrochemical workstation, computer, digital oscilloscope and resistance, transient raman spectrum test part includes pulse delay, in-situ raman cell, objective lens, double cemented lens, charge coupled device, silver mirror, narrow-band filter and raman filter.The present application has excellent adjustability and ease of use, using nanosecond laser pulse to detect the raman spectrum signal of reaction intermediate generated in electrochemical reaction process under the action of electric pulse, through the system, the dynamic process of electrocatalysis reaction can be accurately monitored and analyzed, which provides a powerful tool for studying electrochemical reaction mechanism.

A ranging chip (201), device, and method based on Time-of-Flight (ToF) are disclosed, relating to the field of chip technology. This invention improves the accuracy of ToF ranging and effectively enhances the ranging distance of ToF. The ranging chip (201) includes: a first signal generator (301) for generating a first signal, the first signal comprising a plurality of first pulses, the width of which is a first width T, the first signal being used to control a light-emitting device to emit a light signal toward a target object; a second signal generator (302) for generating a second signal based on the first signal, the second signal comprising a plurality of first pulses in the first signal, and at least one second pulse delayed by a first width T from each of the plurality of first pulses; and a continuous wave processing circuit (303) for integrating the received light signal reflected from the target object based on the second signal to obtain a plurality of exposure values, the plurality of exposure values ​​being used to calculate the phase delay corresponding to the time of flight of the light signal between the testing chip (201) and the target object.

Providing devices, systems, and methods for treating target tissue SOLUTION: Devices, systems, and methods for delivering pulsed electric field (PEF) energy to tissue through one or more energy delivery bodies each having one or more electrodes are provided. PEF energy is generated from waveforms having various characteristics. Waveform delays, such as pulse-to-pulse delays, cycle-to-cycle delays, phase-to-phase delays, packet-to-packet delays, bundle-to-bundle delays, etc., may be utilized within a treatment to achieve a desired result. In particular, these delays may be specifically manipulated to achieve certain desired results. For example, one, some, or all of these delays may be manipulated to control various aspects of PEF therapy to mitigate any associated risks, such as gas formation, electrical discharge, cavitation, muscle contraction, and temperature rise, to name a few.SELECTED DRAWING: None

The application relates to a target frequency hopping period estimation method based on a rotation phase factor, and belongs to the technical field of signal processing. The method solves the problems of high operation complexity and frequency hopping period estimation error caused by error of a heap in the prior art. The method comprises the following steps: obtaining a frequency hopping signal, obtaining a signal relative time sequence according to an appearance time of the frequency hopping signal; establishing a full zero sequence according to a time duration of the frequency hopping signal and time estimation accuracy, and obtaining a unit pulse sequence according to the signal relative time sequence; taking out a shift value in a frequency hopping shift value range, obtaining a detection threshold according to the time duration of the frequency hopping signal; shifting the unit pulse sequence according to the shift value to obtain a unit pulse delay sequence, obtaining a detection result based on a rotation phase factor; if the detection result is greater than the detection threshold, the shift value is taken as a target frequency hopping period estimation value; and finally, the frequency hopping period estimation value of one or more targets in the frequency hopping signal is obtained. The method realizes fast period estimation of the frequency hopping signal.

The invention belongs to the related technical field of agricultural product nondestructive testing, and discloses a rice quality rapid detection method based on double-pulse differential LIBS (laser-induced breakdown spectroscopy), which comprises the following steps: configuring a detection system comprising a double-laser differential detection module, an AOTF (acousto-optic tunable filter), a gated PMT (programmable metal detector) and an FPGA (field programmable gate array) for a sample; the method comprises the following steps of: decomposing full-index detection into a plurality of continuous detection periods; sequentially executing a series of operations of setting a target wavelength, triggering a first laser pulse, first preset delay, acquiring a reference background signal, preset inter-pulse delay, triggering a second laser pulse, second preset delay, acquiring and analyzing a mixed signal, calculating a net characteristic signal of a current detection period and the like; and combining all the net characteristic signals to jointly execute comprehensive evaluation of the rice quality. According to the invention, continuous background interference in LIBS detection can be effectively inhibited, detection results including heavy metal element content and other physical defect information in rice can be accurately obtained, and rapid and integrated discrimination of rice quality can be realized.

The utility model provides a time-domain double-pulse delay-adjustable high-power nanosecond laser, which comprises a passive Q-switched resonant cavity, a single-lamp double-rod amplification module, a first single-lamp single-rod amplification module, a second single-lamp single-rod amplification module, a light beam collimation module, a half-wave plate and a delay light path control module which are sequentially arranged, the centers of the single-lamp double-rod amplification module, the first single-lamp single-rod amplification module, the second single-lamp single-rod amplification module, the light beam collimation module, the half-wave plate and the delay light path control module are arranged on the same horizontal line. According to the utility model, laser pulse output with adjustable time-domain double-pulse laser delay time is realized, intelligent regulation and control of the double-pulse laser delay time are effectively realized, and the ubiquitous problems of low energy utilization rate and generation of plasma shielding effect in traditional laser shock peening are improved.

1. Name of the product in this design: Pulse Delay Generator. 2. Purpose of this design: To control signal delay output and precisely adjust pulse timing. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The application discloses a nonlinear chirped fiber grating preparation method and system, and the method comprises the following steps: determining basic processing parameters of a fiber grating according to target parameters; based on the coupled mode theory, initially constructing a nonlinear periodic modulation function and a nonlinear apodization function, calculating a reflection spectrum and comparing the reflection spectrum with a target spectrum, and repeatedly adjusting the two functions for iteration optimization until the error reaches a standard; a periodic modulation selects a signal generator or a displacement table chirp, the former calculates a pulse delay according to a period value through a uniform displacement table, and the latter calculates a displacement table speed according to a period value through a uniform laser pulse; apodization modulation selects laser power or grating point spatial modulation, the former dynamically adjusts power to control the refractive index change, and the latter controls the laser focal point and the fiber core position; and the nonlinear chirped fiber grating is processed according to the optimized function and the selected mode. The application meets the application requirement of a complex optical system.

The invention discloses a data input device which comprises an input end circuit, a training circuit, a detection circuit, a data delay line and a clock delay line. The input end circuit is used for receiving a first data signal and a first clock signal. The training circuit is used for setting a first delay setting according to a first data signal and a first clock signal. The first delay setting includes a first data delay amount and a first clock delay amount. The detection circuit is used for setting a second delay setting according to a first delay setting and a clock period of the first clock pulse signal. The second delay setting includes a second data delay amount and a second clock delay amount. The data delay line is used for outputting a second data signal according to the first data signal and a second data delay amount. The clock delay line is used for outputting a second clock pulse signal according to the first clock pulse signal and a second clock pulse delay amount.

1. Name of the product in this design: Panel of light adjustment module. 2. Purpose of this design: The overall purpose of the product is to achieve modulation and generation of various detection optical signals, supporting pulsed light and continuous light emission modes, with adjustable pulse width, average photon count and pulse delay. The partial purpose of the product is to be used as a panel for a light adjustment module. 3. The key design features of this product are the combination of shape and pattern. 4. The picture or photo that best illustrates the key design points: Design 1 front view. 5. Design 1 is designated as the basic design. 6. Other situations requiring explanation: The parts covered by the semi-transparent red filler are non-protected parts.

The present application relates to a kind of based on time domain shaping femtosecond laser high-quality processing CFRP method, belong to CFRP material processing field.The present application is based on femtosecond laser processing CFRP, traditional femtosecond laser is shaped in time domain, it is divided into double pulse with interval 0.1-100ps in time, utilize the characteristics that the material system of each component of CFRP composite material is different, by regulating pulse delay and pulse number explore its respective threshold variation law, and compare between threshold difference change trend, finally according to actual processing purpose select appropriate time domain shaping femtosecond laser processing parameter to realize the high-quality processing of CFRP.This based on time domain shaping femtosecond laser high-quality processing CFRP method, the processing result obtained is without impurity residue, processing uneven, or without layering, tearing, burr and other adverse phenomena, and simultaneously realize the dynamic regulation of different components in material, increase or reduce the difference between different components according to processing demand, to reduce the thermal damage of pre-processing surface or the heat-affected zone of hole and groove structure edge, this method shows the manufacturing capacity and application prospect of high-quality processing CFRP.

The present application relates to a kind of microscopic speckle interferometry full-field imaging detection device, including excitation pulse laser, probe pulse laser and digital pulse delay unit.Pulse laser acts on the heat generated by material surface, thereby exciting ultrasonic pulse signal.Ultrasonic carries the defect structure information of material.On the other hand, light shear speckle interferometry technology uses the speckle field of object surface to be imaged on the surface of digital camera image sensor after passing through shear device.When the measured target is loaded by ultrasonic wave and the surface is slightly deformed, the phase distribution of shear speckle interferogram also changes.The two shear speckle interferograms obtained before and after deformation are directly subtracted, and the light intensity difference or phase difference pattern can be obtained.The distribution of stripe is related to the deformation of measured target, and the surface of measured target can be analyzed according to this, so as to measure the off-plane displacement of object surface caused by internal defect under the condition of ultrasonic wave loading.

1. Name of the product in this design: Light adjustment module. 2. Application of this design: It is used to achieve modulation and generation of various detection optical signals, supports pulsed light and continuous light emission modes, and the pulse width, average photon count and pulse delay are adjustable. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

A method of downregulating and / or upregulating neural activity by applying a high frequency alternating current electrical signal to a nerve in a subject is disclosed. The signal comprises more than one microsecond cycle comprising one or more periods, each period comprising a charge recharge phase, and optionally, a pulse delay, each period having a frequency of at least 1000 Hz; and a microsecond inactive phase. In embodiments, an electrical signal treatment comprises more than one microsecond cycle to form a millisecond cycle, each millisecond cycle separated by a millisecond inactive phase during an on time. In embodiments, the electrical signal patterns can differ in amplitude.

This invention discloses an all-optical brain-like training system and method based on a three-dimensional photonic memristor array, belonging to the field of photonic brain-like computing technology. This invention constructs a three-dimensional optical waveguide interconnect network through femtosecond laser direct writing, and sets GST / LiNbO₃ non-volatile optical modulation units at the optical path spatial intersection nodes to form a three-dimensional photonic synapse array. Relying on on-chip multi-wavelength light sources, pulse delay control, and an all-optical differential module, combined with wavelength division multiplexing and time division multiplexing mechanisms, the same physical optical path can carry forward inference optical signals and backward error update optical signals in a time-division manner. The phase transition effect of photo-induced materials is used to achieve in-situ dynamic weight updates in the pure optical domain, constructing an all-optical brain-like training closed loop without electronic computing power intervention. This invention solves the technical problems of low computing power density, inability to perform on-chip autonomous training in optoelectronic hybrid architectures, and high training power consumption of existing two-dimensional photonic chips. It has the advantages of high computing power density, high architectural integration, extremely low power consumption, and hardware-native iterative learning capabilities, and is suitable for various low-power, high-speed brain-like artificial intelligence computing scenarios.

A method and apparatus for performing a medical ablation procedure. In one example, a medical device includes an ablation waveform generator and an electronic controller. The ablation waveform generator is configured to apply an electrical waveform to a treatment element positionable proximate a treatment site of a patient. The electronic controller is configured to control the ablation waveform generator. The electronic controller is further configured to cause the ablation waveform generator to generate a biphase waveform having an inter-phase delay and an inter-pulse delay greater than the inter-phase delay. The electronic controller is configured to cause the ablation waveform generator to apply the biphasic waveform to the treatment element.

There has conventionally been the problem that it is necessary to transmit and receive ultrasonic signals the number of times equal to the number of focal depths. A pulse control program according to the present invention executes a pulse output process for outputting, on the basis of a delay setting value for each of vibrators, a driving pulse that has a delay amount corresponding to the delay setting value to each of the vibrators. The delay setting value is calculated on the basis of a delay curve in which the delay amount increases toward the center in the scanning direction of a plurality of vibrators, and the delay amount decreases toward the start point and the end point in the scanning direction. The delay curve is different for each focal depth. The delay setting value includes, for each vibrator group in which the plurality of vibrators are grouped in accordance with the number of target focal depths, a value that is calculated on the basis of the delay curve corresponding to the corresponding focal depth. In the pulse output process, a plurality of driving pulses that each have the delay amount which has been calculated on the basis of the different delay curve are output in one scanning period.