75 results about "Pulse delay" patented technology

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 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.

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 invention relates to the technical field of distributed pulse control, in particular to a complex network distributed containment pulse control method and system based on dual-channel attack and a computer readable storage medium, and the method comprises the steps: building a complex dynamic network and a leader node; pinning nodes are selected from the complex dynamic network; constructing a distributed delay containment pulse controller; constructing an error network; and solving the distributed control intensity, the pulse interval and the pulse time delay of the distributed delay contained pulse controller based on a constraint condition for stabilizing the global index of the error network to obtain a target distributed delay contained pulse controller. The distributed delay containment pulse controller constructed by the invention enables the network to quickly realize synchronization under the combined action of dual-channel fraud attacks, thereby improving the network security and reducing the control cost on the aspects of time and space.

The invention discloses a multi-channel high-precision time sequence pulse transmitting system, and the system comprises a control panel which comprises a command receiving control unit and a time sequence generation unit; the command receiving control unit is configured to receive a control command and analyze the control command into pulse basic information; the time sequence generation unit is configured to receive the pulse basic information, generate a coarse delay pulse signal according to the pulse basic information, and generate a driving signal; the daughter board comprises a pulse precise delay unit and an optical port output unit; the pulse fine delay unit is configured to receive the driving signal, perform fine delay adjustment on the coarse delay pulse signal and generate a time pulse sequence; the optical port output unit is configured to receive the time pulse sequence and convert the time pulse sequence into an optical signal. The delay precision of the system can be effectively improved.

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.

The invention relates to the technical field of lasers, in particular to a three-level adjustment linear frequency modulation laser pulse generation device which comprises M narrow linewidth lasers with different wavelengths, a pulse modulation module, a wavelength division chopping module and an acousto-optic frequency shift module. Compared with a traditional OTDR-based distributed optical fiber sound wave sensing technology, the method has the advantages that a higher sound wave sampling frequency can be obtained, and the sound wave sampling frequency can even be improved by more than 100 times under the condition that the sensing distance is particularly large; compared with the technology that a narrow linewidth laser of each wavelength adopts a set of independent modulation and frequency shift equipment, and then laser pulses of all wavelengths are combined, modulation and frequency shift of the laser pulses are completed only through one set of modulation and frequency shift equipment, and the material cost is greatly saved. Therefore, the problem of high hardware cost caused by adopting a multi-wavelength pulse delay modulation technology to improve the sampling frequency is solved.

The present invention relates to the field of microgrid control technology, and discloses an intelligent cloud-edge collaborative microgrid control system. In a time period before a water pump contactor closing signal is detected, the rate of change of the zero-sequence voltage per unit time is measured at fixed time intervals; the presence of a zero-sequence cross-reverse jump is determined based on the rate of change, and the jump moment of the zero-sequence cross-reverse jump is recorded; a virtual reactance is generated based on the polarity of the rate of change of the zero-sequence cross-reverse jump, and the virtual reactance is injected into the DC bus through an inverter; the presence of a DC negative pulse delayed zero crossing is determined based on the bus current, and the negative pulse energy corresponding to the DC negative pulse delayed zero crossing is estimated; the negative pulse energy is used as a control quantity, combined with a preset phase shift angle, and the control quantity is fed back to the water pump motor according to a preset power curve; after the feedback continues for a preset feedback time, the zero-sequence voltage and the DC bus current are obtained, and when the zero-sequence voltage and the DC bus current return to the normal operating range, the normal control mode is returned.

To provide a pulse width measuring circuit with which a measurement time is shortened.SOLUTION: A first programmable delay circuit 130 and a second programmable delay circuit 140 respectively delay a first pulse S1 and a second pulse S2 corresponding to an input pulse SIN and generate a first delay pulse Sd1 and a second delay pulse Sd2. A latch circuit 150 latches the first delay pulse Sd1 in response to an edge of the second delay pulse Sd2. A controller 160 continuously sweeps a delay amount τ2 of the second programmable delay circuit 140 in first processing, and detects a first delay mount τP when the output Q of the latch circuit 150 changes. In second processing, the delay amount τ2 of the second programmable delay circuit 140 is changed by a binary search and a second delay amount τn is detected when the output Q of the latch circuit 150 changes. The difference between the first delay amount τP and the second delay amount τn is made a pulse width Tp of the input pulse SIN.SELECTED DRAWING: Figure 1

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.

A visual quantitative measurement system and method for the airflow angle at the outlet of a reverse thrust cascade belongs to the field of engine aerodynamics. The present invention comprises a binocular photogrammetry system, a digital pulse delay signal generator, a computer, a square guide rail, and a wrench slider. The binocular photogrammetry system is slidably mounted on the square guide rail via the wrench slider. The binocular photogrammetry system is connected to the digital pulse delay signal generator. Images collected by the binocular photogrammetry system are input and stored in the computer. The digital pulse delay signal generator is connected to the computer. In order to overcome the problem that existing wire technology can only provide intuitive qualitative display, the present invention realizes the quantitative measurement capability of the airflow angle at the outlet of the reverse thrust cascade of the entire machine on the ground platform of the reverse thrust full-ring performance test piece.

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.

There is provided a method for ultrasound imaging comprising applying an ultrasound modulation wave at a fixed frequency F1 and a period P1 to a target in a body, the body having received an injection of microbubbles through a fluid, the modulation wave causing the microbubbles to undergo stable acoustic cavitation, emitting, toward the target and concurrently with the modulation wave, ultrasound imaging pulses centered at a frequency F2 and having a pulse repetition period of n*P1 and a pulse delay of m*P1 / k, where the pulse delay varies with m, m<k, and k>1, detecting reflections of the ultrasound pulses by the microbubbles after each emission for a duration corresponding to a maximum depth of the target, and forming ultrasound images from the reflections.

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 invention relates to the technical field of micro-grid control, and discloses an intelligent cloud edge collaborative micro-grid control system, which is characterized in that the change rate of zero sequence voltage in unit time is measured according to a fixed time interval in a time period before a closing signal of a water pump contactor is detected; according to the change rate, judging that zero-sequence alternating current and reverse current jump exists, and recording the jump moment of the zero-sequence alternating current and reverse current jump; virtual reactance is generated according to the polarity of the change rate of the zero-sequence alternating current bounce, and the virtual reactance is injected into the direct-current bus through the inverter; judging whether direct-current negative pulse delay zero crossing exists or not according to the bus current, and estimating negative pulse energy corresponding to the direct-current negative pulse delay zero crossing; negative pulse energy is used as a control quantity, a preset phase shift angle is combined, and the control quantity is fed back to a water pump motor according to a preset power curve; and after the feedback lasts for a preset feedback duration, obtaining a zero-sequence voltage and a direct-current bus current, and when the zero-sequence voltage and the direct-current bus current are recovered to a normal operation range, returning to a conventional control mode.

The present invention provides 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 multiple energy pulses, each energy pulse separated by an inter-pulse delay period.

A communication system comprising: a pulse generation system comprising one or more pulse repetition frequency (PRF) oscillators and one or more pulse generators, wherein each PRF oscillator is connected to a pulse generator, and wherein each pulse generator is configured to generate a pulse; and three or more transmitters 310a-N, wherein each transmitter is connected to the pulse generation system and wherein the pulse generation system is configured to send a pulse to each transmitter, each transmitter comprising: a pulse delay block configured to introduce a time delay to the pulse sent to the transmitter; and an antenna 314a-N.

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.