290 results about "Pulse duration" patented technology

The invention discloses a wavelength-adjustable high-power picosecond all-solid-state laser. The microchip seed source adopts a passive Q-switching principle, can directly generate laser with the pulse width as narrow as 300ps, is high in seed laser efficiency, good in beam quality and large in energy, can synchronously output TTL (transistor-transistor logic) level, and is used for controlling the pulse duration and delay of a 808nm QCW pumping source; the optical isolator protects the front-stage microchip solid laser from being damaged by returned light of the rear-stage amplifier; the single-rod two-way end pump amplifier amplifies laser pulse energy output by the microchip solid laser; the light beam shaper comprises a Galileo laser beam shrinking system and a soft edge diaphragm and is used for shaping light beams; the single-rod one-way end pump amplifier amplifies the pulse energy of the preceding-stage laser; and the frequency multiplier performs frequency conversion on the output laser, and outputs wavelength-adjustable picosecond laser with millifocus magnitude, high power and high beam quality.

The invention relates to the technical field of welding, in particular to a hot riveting welding head synchronous temperature control method and system based on the temperature change rate, and the method comprises the steps: executing full-power heating pulse triggering operation on a welding head, calculating the pulse duration according to a start timestamp and an end timestamp, calculating the temperature rise, and eliminating peak noise through a digital filtering algorithm; environment temperature and relative humidity are collected in real time, and equivalent heat capacity is calculated; the initial temperature difference between any welding heads is calculated, and a dynamic target temperature curve is constructed; and calculating an actual temperature change rate, synchronously extracting a target change rate of the dynamic target curve at a corresponding moment, calculating a change rate deviation between the two change rates, judging whether intervention adjustment is needed or not, calculating an output signal by using an incremental PID algorithm if intervention adjustment is needed, and adjusting the heating power according to the output signal. According to the scheme, the stability of the hot riveting welding quality is effectively improved by accurately quantifying the thermal characteristics of the heterogeneous welding head, dynamically planning a personalized temperature rising track and performing high-frequency closed-loop regulation and control.

An optical metrology device includes a selectable pump arm that is used to produce a transient response in the target sample and a probe arm and may be configured to perform static Magneto-Optic Kerr Effect (MOKE) measurements or ellipsometry measurements when the pump arm is not selected, and time resolved (TR) MOKE measurements or ellipsometry measurements when the pump arm is selected. The optical metrology device may be further configured to perform opto-acoustic measurements when the pump arm is selected. A pulse shaper in the pump arm may be used to pulse duration, phase, or both, of the incident pump beam to enable measurement of the dependence of the magnetic dynamics on the pump pulse characteristics. The optical metrology device may be configured to operate at a single selectable wavelength or multiple wavelengths in a continuous or discontinuous spectrum.

The invention relates to the technical field of cable fault detection, in particular to an insulation fault detection method, system and device for a flexible signal cable, and the method comprises the steps: obtaining the electromagnetic wave intensity of each position at different sampling moments in the working process of the flexible signal cable, extracting the local pulse segment of each high-frequency sequence, and obtaining the local pulse segment of each high-frequency sequence; constructing a pulse steep coefficient of each local pulse segment by combining the change degree of the electromagnetic wave intensity in each local pulse segment and the pulse duration; and analyzing the frequency range and the phase difference of the electromagnetic wave intensity in the frequency domain, and constructing the partial discharge frequency coefficient of each ultrahigh frequency sensor by combining the amplitude average level and the phase fluctuation, thereby obtaining the partial discharge characterization value of each ultrahigh frequency sensor so as to detect the insulation fault of the flexible signal cable. According to the invention, the influence of electromagnetic interference on insulation fault detection can be reduced, and the accuracy of insulation fault detection of the flexible signal cable is improved.

According to the mask defect in-situ repairing method, the femtosecond laser is adopted for defect repairing, and all the advantages of the femtosecond laser are absorbed. Femtosecond laser is ultrashort pulse laser with'femtosecond 'as a time unit, the pulse duration time of the femtosecond laser is extremely short (femtosecond magnitude), and the peak power of the femtosecond laser is extremely high (the maximum can reach pat watt). Therefore, according to the repairing method, the repairing precision can be reduced to 15 nm, the heat affected zone is smaller than 1 micron, the repairing time can be shortened to 100 ms for the defect of 100 nm, the roughness of the repaired surface is smaller than or equal to 0.5 nm, meanwhile, the good effects of high repairing precision, low heat affected zone, high repairing speed, low equipment cost and simple operation are achieved, and the rejection rate of the mask is reduced. The method is especially suitable for repairing advanced process masks, such as EUV and ArF, and display panel masks, such as OLED and FMM, and MEMS device masks.

The invention relates to the technical field of single-photon detection, in particular to a single-photon detector performance parameter measurement method, device and equipment and a storage medium, and the method comprises the steps: building a statistical histogram of time domain interval data, and building the statistical distribution characteristics of the photon counting rate and dark counting of a single-photon detector; the probability of no photon detection event in the duration of the optical pulse and the ideal probability of no dark pulse in a preset time window are defined based on the statistical distribution characteristics, and then the probability of generating a single photon signal by the periodic optical pulse is calculated based on the obtained parameters; and finally, determining a periodic statistical peak count value based on the statistical histogram and the probability of generating the single photon signal by the periodic light pulse, and calculating an average detection photon number and a dark count rate so as to obtain the dead zone time, so that information such as the average detection photon number, the dark count rate and the dead zone time of the single photon detector is simultaneously represented through one-time data acquisition, and the detection accuracy of the single photon detector is improved. The problems that in a traditional method, the data storage amount is large, and cost is high are solved.

Disclosed herein is an electroporation system including a catheter shaft, at least one electrode coupled to the catheter shaft at a distal end thereof, and an electroporation generator coupled in communication with the at least one electrode. The electroporation generator configured to supply a biphasic pulse signal to the at least one electrode. The biphasic pulse signal includes a first phase having a first polarity and a first pulse duration, and a second phase having a second polarity opposite to the first polarity, and a second pulse duration. Each of the first phase and second phase has a voltage amplitude of at least 500 volts and a pulse duration of less than 20 microseconds. The second phase is generated at a non-zero interval following the first phase.

An audio authentication and identity verification system and method that encodes dynamic cryptographic information across the audible and inaudible spectrum (0 Hz→30 kHz, scalable to 124 kHz). A rolling acoustic signature simultaneously embeds identity, time, date, and GPS location using a hybrid of frequency shift keying (FSK), phase shift keying (PSK), Morse style pulse duration modulation, and time domain multiplexing. To guarantee post-event privacy and integrity, the system further incorporates a dual custody audio architecture in which every authenticated recording is split into complementary bit interleaved segments stored separately, and the decryption key is fragmented via Shamir 3-of-5 secret sharing—preventing unilateral access or tampering. The system establishes a tamper proof, real time, and offline capable authentication layer that functions in air, through conventional microphones, and via dedicated emitter hardware.

In accordance with an embodiment, a method for controlling a constant on-time switched mode power converter includes: generating a pulse signal having an on-time; during a soft-start phase of the power converter, successively increasing the on-time from an initial duration to a final duration, wherein the final duration is larger than the initial duration; sensing an output voltage of the power converter and generating a feedback signal proportional to the output voltage; adjusting a frequency of the pulse signal based on the feedback signal and a reference signal; and driving a power switch with the pulse signal to control the power switch and regulate the output voltage.

A keyboard system comprises a key structure including a key switch with a lighting element and phototransistor, and one or more processors that drive the lighting element for a first pulse duration. The output of the phototransistor is determined at the end of the first pulse duration, wherein the key structure is determined to be pressed when the output is below a first output value at an end of the first pulse duration, and unpressed when the output of the phototransistor is above a second output value at the end of the first pulse duration. A fall-time of the output during the first pulse duration is determined and the first pulse duration is calibrated to a second pulse duration when the fall time less than the first pulse duration, the second pulse duration being greater than the fall time and less than the first pulse duration.

A method and system for generating deep ultraviolet (DUV) laser light is disclosed, in one embodiment the DUV laser system includes a fiber laser source configured to emit a poised fundamental laser beam in the near-infrared with a pulse duration of less than 400 femtoseconds (fs), a nonlinear crystal assembly comprising first, second, and third nonlinear crystals that is configured to convert the fundamental laser beam to produce a fifth harmonic laser beam having a wavelength in a range from 200 nanometers (nm) to 230 nm, and at least one compensation plate disposed in at least one position preceding at least one of the first, second, and third nonlinear crystals and configured such that a pair of pulsed laser beams transmitted through the at least one compensation plate are spatially and temporally overlapped within the at least one of the first, second, and third nonlinear crystals.

A spacecraft thruster distribution and pulse width modulation method based on a dynamic inverse matrix comprises the following steps: calculating a torque matrix generated by each thruster in combination with the installation position, the thrust size and the thrust direction of the thruster; the control direction of each thruster is determined, and grouping is carried out according to the control directions of the thrusters; a thruster for controlling the three-axis positive direction is pre-selected, a torque matrix corresponding to the pre-selected three-axis positive axial thruster is generated, and the air injection pulse width duration of the three axes is calculated in combination with instruction control torque; according to the calculated symbol of the three-axis jet pulse width duration, reselecting a thruster, and obtaining a dynamic torque matrix of the reselected thruster; according to the instruction torque sent by the upper computer and the dynamic torque matrix of the reselected thrusters, the jet pulse width duration of each thruster is calculated based on a matrix inversion algorithm; the thruster pulse width modulation method is designed on the basis of considering the coupling influence of the three axes of the thruster, and can adapt to the large-range change of the mass center of the aircraft.

The application provides a method for regulating halogen perovskite microstructure at a frozen temperature by using a laser and an electric field, and relates to a device, which is a customized TEM in-situ sample rod equipped with a laser optical fiber and a liquid nitrogen Dewar bottle, and a Nd:YAG pulse laser system with a wavelength of 532 nm, adjustable pulse frequency and a pulse duration of 7 ns coupled into a transmission electron microscope through the optical fiber; first, at a frozen temperature, perovskite nanocrystals are etched by controlling the energy, frequency and action time of the pulse laser, then at the frozen temperature, the small crystal nucleus rotation of the perovskite nanocrystals is controlled by using a low-energy pulse laser and applying an electric field, and the perovskite nanocrystals are recrystallized along specific crystal faces, so that perovskite nanocrystals with specific exposed surfaces, reduced microstructure defects and increased radiation resistance are obtained, and the method has great value for large-scale industrial production.

A cancer treatment with improved effectiveness may feature emission of radiant energy from a laser source based upon measured parameters, particularly melanin content, in a patient's surrounding tissues. Multiple wavelengths of radiant energy, pulse durations, and intensities may be utilized in the radiant energy emission based upon the patient's tissue parameters. One embodiment of a laser source features multiple laser modules (201) which may be independently operated and adjusted for intensity and active duration.

A method for treating a metal substrate includes generating a beam from a single laser having a pulse duration less than 800 femtoseconds and a wavelength greater than 700 nanometers. The beam is split via a diffractive optical element to establish first and second separated beams angled away from each other. An optical prism alters respective pitches of the separated beams, and a focal lens receives the altered beams to angle them toward each other at or near a single focal point on the metal substrate. The combined laser irradiation from the altered, separated beams affects the metal substrate to concurrently form a plurality of microstructures and nanostructures thereon.

The present invention relates to a method and to a device for correcting the shape of an optical component (1) using pulsed laser radiation. For this purpose, the component (1) is measured and excess material (7) is determined by way of comparison with a target geometry (6) and is at least partially removed by machining using at least one pulsed laser beam (4) with pulse durations of > 1 μs in order to at least approximate the actual geometry (5) to the target geometry (6). During machining, the component (1) is rotated at a rotational speed about an axis of rotation, wherein the distance of the laser beam (4) to the axis of rotation is changed at least temporarily. The rotational speed, the beam diameter of the laser beam (4) on the component (1) and the temporal pulse interval between the pulses of the laser beam (4) are selected such that material regions of the component (1) removed by successive pulses of the laser beam (4) do not overlap.

The invention relates to the field of non-invasive monitoring, and particularly provides a method for evaluating vascular elasticity through radial artery pulse waves. The method comprises the following steps that 1, radial artery pulse waves are obtained; step 2, preprocessing the radial artery pulse wave to obtain an average pulse period; 3, calculating a dominant wave angle based on the average pulse period; step 4, calculating pulse duration based on the average pulse period; step 5, calculating rise time based on the average pulse cycle; step 6, calculating a main wave amplitude based on the average pulse period; step 7, calculating a waveform area based on the average pulse period; and 8, establishing an evaluation model, inputting the dominant wave angle, the pulse duration, the rise time, the dominant wave amplitude and the waveform area into the evaluation model, and outputting a vascular elasticity predicted value by the evaluation model. According to the method, the accuracy of predicting the vascular elasticity is high, and the cost is low.

A method and apparatus for inscribing a high-temperature stable Bragg grating in an optical waveguide, comprising the steps of: providing the optical waveguide; providing electromagnetic radiation from an ultrashort pulse duration laser, wherein the wavelength of the electromagnetic radiation has a characteristic wavelength in the wavelength range from 150 nanometers (nm) to 2.0 micrometers (μm); providing cylindrical focusing optics; providing a diffractive optical element that when exposed to the focused ultrashort laser pulse, creates an interference pattern on the optical waveguide, wherein the irradiation step comprises irradiating a surface of the diffractive optical element with the focused electromagnetic radiation, the electromagnetic radiation incident on the optical waveguide, from the diffractive optical element, being sufficiently intensive to cause permanent (Type II) change in the index of refraction within multiple Bragg grating planes in the core of the optical waveguide resulting from at least one micropore.

Apparatus and method for managing data in a non-volatile memory (NVM) having an array of ferroelectric memory cells (FMEs). A data set received from an external client device is programmed to a group of the FMEs at a target location in the NVM using a selected profile. The selected profile provides different program characteristics, such as applied voltage magnitude and pulse duration, to achieve desired levels of power used during the program operation, endurance of the data set, and latency effects associated with a subsequent read operation to retrieve the data set. The profile may be selected from among a plurality of profiles for different operational conditions. The ferroelectric NVM may form a portion of a solid-state drive (SSD) storage device. Different types of FMEs may be utilized including ferroelectric tunneling junctions (FTJs), ferroelectric random access memory (FeRAM), and ferroelectric field effect transistors (FeFETs).

We present a ground-based laser system for searching, ranging, and tracking that actively illuminates small resident space objects (RSOs) in low Earth orbit (LEO) and observes position and transit-time of reflections, enabling orbital custody of most one-to-few centimeter-sized objects. A diode-pumped alkali laser (DPAL) augmented with mode-locking and Q-switching serves as an illuminator and offers exceptionally high spectral brightness due to its output beam's sub-nanosecond pulse duration and picometer-level spectral linewidth. Kilohertz fast-rastering enables interrogations of distinct few-meter-sized sky-patches at megahertz rates. Paired on the observation side with one or more telescopes outfitted with Faraday anomalous dispersion optical filters (FADOFs), image intensifiers, multi-pixel arrays, and nanosecond timing, the combined system could offer nearly background-free discoveries of RSOs every hour, even during daytime. Periodically re-flashing previously discovered objects to maintain orbit custody expends only a small fraction of total observing time.

The invention discloses a converter transformer fault diagnosis method and system based on voiceprints and thermal signals, and the method comprises the steps: carrying out the time-frequency decomposition of each voiceprint original signal data and temperature thermal signal data of a converter transformer, and obtaining a sound time-frequency matrix and a temperature time-frequency matrix; the kurtosis and the sound pulse duration of the time-frequency matrix of the sound are calculated to serve as basic time-frequency characteristics of the sound; calculating an energy gradient and an entropy change rate of the time-frequency matrix of the temperature as basic time-frequency characteristics; coupling characteristics of the time-frequency matrixes of the sound and the temperature in the same frequency band are extracted; performing feature screening on all basic time-frequency features and coupling features by calculating a maximum mutual information coefficient, and outputting an optimal feature subset; and constructing a converter transformer fault diagnosis-oriented identification model fusing ensemble learning and random forest, and training the identification model according to the optimal feature subsets in different operation states to perform fault diagnosis. The fault risk sensing capability of the converter transformer can be effectively improved.

The invention relates to a method for producing a material board having at least one layer comprising at least a portion of natural fibers, wherein at least one of the at least one layer comprises a useful product made from a raw material comprising natural fibers, wherein the method comprises at least the following steps: i) providing a system for producing a material board, at least comprising: material preparation, gluing, shaping, pressing, and finishing, iii) breaking down the raw material under the action of a pressure shock wave having a pulse duration and a pulse frequency into at least a first, odd-indexed component and a second, even-indexed component using at least one device for breaking down the raw material under the action of a pressure shock wave having a pulse duration and a pulse frequency,iv) Separating the first, odd-indexed component and the second, even-indexed component based on at least one parameter. v) Making the (at least one) obtained odd-indexed component available for use in at least one further process step of the method. In order to be able to produce material plates in an environmentally friendly and cost-effective manner, among other things, it is proposed to provide the following step: vi) Disassembling at least one of the even-indexed components under the influence of a pressure shock wave having a pulse duration and a pulse frequency, such that at least one further odd-indexed component is created.

The invention provides a display device and an image brightness modulation method thereof. In the display device, a clock signal generator is used for generating a plurality of original clock signals in a display frame. The display frame has a valid frame and a plurality of skip frames. Each of the original clock pulse signals has a first pulse duration in a valid frame and a plurality of skip frames, respectively. The pulse width modulator is used for receiving a plurality of original clock pulse signals and setting a plurality of pulse width compensation values respectively corresponding to each original clock pulse signal in a plurality of skip frames. The pulse width modulator modulates each original clock signal from a first pulse duration to a second pulse duration in a plurality of pulse durations in a plurality of skip frames according to a plurality of pulse width compensation values.

This invention relates to a keyboard system and a method of operating the keyboard. The keyboard system includes: a key structure comprising a key switch having a light-emitting element and a phototransistor; and one or more processors driving the light-emitting element for a first pulse duration. The output of the phototransistor is determined when the first pulse duration ends, wherein if the output is lower than a first output value when the first pulse duration ends, it is determined that the key structure is pressed, and if the output of the phototransistor is higher than a second output value when the first pulse duration ends, it is determined that the key structure is not pressed. The fall time of the output during the first pulse duration is determined, and if the fall time is less than the first pulse duration, the first pulse duration is calibrated to a second pulse duration, the second pulse duration being greater than the fall time and less than the first pulse duration.

This disclosure provides systems, methods, and apparatus related to broadband emitters. In one aspect, a method includes providing a material. A pulse fluence, a wavelength, a repetition rate, and a pulse duration of a laser pulse are specified, and a number of laser pulses are specified. The material is exposed to the specified number of laser pulses at the pulse fluence, the wavelength, the repetition rate, and the pulse duration. The material is translated and the exposing operation is repeated to form an x-y array of exposed areas on the material. Each exposed area is about 25 microns to 35 microns from each other exposed area.

This invention discloses a method and system for resisting slice reconstruction interference based on alternating frequency modulation slope polarity and time-series agility. It mainly addresses the problems of high complexity, poor real-time performance, and high dependence on prior information and training data in existing technologies. The scheme is as follows: At the transmitting end, a joint agile transmission signal is established based on the number of sub-pulses, sub-pulse duration, sub-pulse interval, sub-pulse bandwidth, and sub-pulse frequency modulation slope; at the receiving end, the received signal is segmented according to the recorded sub-pulse timing to obtain each segment signal, and pulse compression and delay compensation for both matched and mismatched channels are performed simultaneously; dynamic weights are generated based on the energy of the two compensated channels; an anomaly suppression factor is constructed based on the energy of the matched channels of each segment, and the output of each segment's matched channels is weighted and accumulated using this factor and the dynamic weights to obtain a one-dimensional range profile result. This invention does not require a large amount of training data or estimation of interference parameters, has low computational complexity, can suppress false targets generated by slice reconstruction interference while maintaining the energy of the real target, and can be used for target detection.

The invention relates to a method and a device for determining a phase difference (6) between a measurement signal (4) and a reference signal (5), at least comprising: converting the measurement signal (4) into a first square-wave signal (33) and the reference signal (5) into a second square-wave signal (35), which are each substantially symmetrical square-wave signals (33, 35), the pulse duration of which corresponds to half a period duration; determining the phase difference (6) by means of a phase comparison of the two square-wave signals (33, 35), wherein, by means of a logic module (36, 63), a pulse-duration-modulated signal is generated, from which the phase difference (6) is extracted. The invention also relates to an optical arrangement (200) for determining a phase difference (6) between a first optical signal (1) and a second optical signal (2).

The present invention belongs to the field of frequency-hopping communication protection, and particularly relates to a frequency-hopping parameter modification protection method based on cooperative reconnaissance. The protecting party obtains the pulse duration parameter of the frequency-hopping radio of the communicating party through cooperative reconnaissance; while detecting the frequency-hopping communication signal, time synchronization and signal forwarding are carried out to ensure that a processed signal with a random length is immediately transmitted after the end of the frequency-hopping communication pulse as a protection signal, thereby destroying the single-transmitter working rule that only one hop pulse exists at the same moment in the frequency-hopping signal and the rule that the pulse duration of most frequency-hopping signals is fixed; for the reconnaissance party, within the same moment, there is an overlap in the time domain between two adjacent frequency-hopping pulses, and the pulse durations are inconsistent, so the reconnaissance system will not recognize it as a frequency-hopping signal but will recognize it as a discontinuous signal at different frequency points, destroying the signal detection link in the frequency-hopping reconnaissance process and reducing or even invalidating the reconnaissance effectiveness of the reconnaissance system for the frequency-hopping signal.

A device includes a grouping of N qubits, where N is equal to two or more, and a coherent light source configured to, given selected values for a set of parameters of at least a first and a second laser pulse, the parameters selected from a relative phase shift, a laser frequency, a laser intensity, and a pulse duration: apply at least the first and second laser pulses to all qubits within the grouping of N qubits, thereby coupling a non-interacting quantum state |1 to an interacting excited state |r, such that each qubit that begins in quantum state |1 returns to the state |1 upon completion of the at least first and second laser pulses, and such that qubits in the grouping are mutually blockaded.

The present disclosure relates to an inertial sensor for measuring an amount of inertia along a sensing axis. The sensor includes an atom interferometer including a pulse generator for generating one or more pulsed light beams defined by respective pulse durations to place atoms in superposition and recombine the atoms to measure interference of the atoms, the one or more pulsed light beams being configured to generate one or more pulsed light beams, the one or more pulsed light beams being defined by respective pulse durations, the one or more pulsed light beams being defined by respective pulse durations, and the one or more pulsed light beams being defined by respective pulse durations, the one or more pulsed light beams being defined by respective pulse durations. And calculating the amount of inertia based on the measured interference. The sensor further includes an auxiliary acceleration sensor configured to measure acceleration transverse to one or more of the pulsed light beams; and a control system configured to calculate a lateral offset of the atoms relative to the pulsed light beam caused by the measured acceleration transverse to the one or more of the light beams, increase the pulse duration, and adjusting the pulse timing to compensate for a reduced beam strength applied to the atoms due to the lateral offset.