38 results about "Fast pulse" patented technology

The invention discloses a pulse stable output control method and system for an ns-level high repetition frequency fast pulse power supply, and relates to the technical field of automatic control, the system is composed of a plurality of functional modules, and the system comprises a self-adaptive absorption module, a control module and an output control module, and the self-adaptive absorption module obtains power supply parameters through real-time sampling, and the power supply parameters comprise load impedance and switch tube parasitic parameters; dynamically optimizing R and C parameters of the RCD absorption circuit and the active clamping circuit based on power supply parameters; the feed-forward prediction module is used for extracting derivative state information according to the power supply parameters, acquiring load current feed-forward and resonant circuit states based on the derivative state information, modeling based on the load current feed-forward and resonant circuit states, and predicting the drain-source voltage valley bottom moment of the switch tube; and the multi-section variable impedance transmission module adopts a three-section variable impedance structure, performs broadband impedance matching based on R and C parameters of the optimized RCD absorption circuit and the active clamping circuit, inhibits pulse leading edge reflection distortion, and outputs undistorted pulse signals.

The invention discloses a wide fundamental frequency electric energy metering method and device suitable for rapid change of a tidal current direction. The method is based on a Fir zero-step angular difference compensation algorithm, a self-convolution multi-order cascade adaptive filter algorithm and a single-cycle fast pulse forming algorithm. The metering device comprises a signal conditioning unit, an algorithm data processing unit and a function management unit. According to the invention, point-by-point compensation of a sampling signal angle difference is realized, residual high-frequency components in an integral interval under a wide fundamental frequency signal are filtered, the problem that forward active electric energy and reverse active electric energy counteract each other when a power flow changes frequently is solved through a single-cycle fast pulse forming algorithm, and the metering accuracy is improved.

The invention relates to an equivalent modeling method and system for an impulse voltage disturbance source in a immunity test, and the method comprises the steps: building an equivalent circuit model of a static gun according to a static gun equivalent circuit in combination with SPICE simulation optimization, and in combination with the overall structure of the static gun used by a human body; the method comprises the following steps: constructing an equivalent circuit model of an electrical fast pulse train based on a circuit structure suggested by an electrical fast pulse train immunity test standard in combination with SPICE simulation optimization; a combined wave circuit is analyzed by adopting an SPICE tool, a surge combined wave generator circuit model is constructed by adopting a step voltage source on the basis of an original circuit model in combination with circuit parameters, and an impulse voltage disturbance source in an immunity test is realized based on the three models. By constructing the equivalent circuit model of the electrostatic gun, the equivalent circuit model of the electrical fast pulse train and the circuit model of the surge combination wave generator, the protection performance of the electromagnetic protection device under the surge voltage disturbance source is simulated and tested, and the anti-interference performance of protection measures is accurately predicted and evaluated.

The invention discloses a short-stroke fast pulse generating device which comprises a shell, a generator module, a rotating shaft, a magnetic coupling module, a plunger pump, a piston body, a reset spring, a pressure balance rubber sleeve and a piston rod, the generator module, the rotating shaft, the piston body and the piston rod are sequentially arranged in the shell in the length direction of the shell, and the generator module comprises a stator and a rotor; the stator is fixedly arranged in the shell, the rotor is rotationally arranged in the stator, and the stator is arranged at one end of the rotating shaft. According to the technical effects, the magnetic coupling module is adopted, conversion from mechanical energy to electric energy is achieved through external slurry pressure, the self-power-generation requirement is met, the stroke of 4.6-5.6 mm is designed, pulse signals are generated in a short period through rapid reciprocating motion of the piston body, the pulse signals can be rapidly generated, and therefore the transmission rate of the pulse signals is increased; the device can be used in a complex drilling process, realizes high transmission rate through fast pulse, and provides support for fast decoding of ground equipment.

The present invention discloses a high-speed motion control method applied to a phase modulation workbench of an LCOS system, which includes dividing a large-format processing pattern into several pattern blocks, generating two-dimensional physical coordinates and pattern block numbers corresponding to each pattern block, and sorting the two-dimensional physical coordinate set in the position file in ascending order row by row or column by column; the motion controller uploads the data row by row or column by column to the memory of the motion controller in sequence, and uploads the sub-bitmaps corresponding to the pattern block numbers to the memory of the LCOS board row by row or column by column; the workbench scanning axis triggers a timing pulse signal by position, and simultaneously sends it to the LCOS and the pulsed light source to form a fast pulse scanning exposure. The present invention utilizes the characteristics of high pulse laser energy, short pulse width, and high repetition frequency, and realizes single-frame polarization pattern recording based on multiple pulses. For the precise control of the motion of the workbench, it has achieved the advantages of large exposure area, high efficiency, and good reliability.

The invention provides a pulse trigger and a phase discriminator. The pulse trigger comprises a logic module, a first input stage module and a second input stage module, the circuit structures of the first input stage module and the second input stage module are the same; the logic module comprises a first charging path corresponding to a differential signal positive end signal of the first clock signal and a second charging path corresponding to a differential signal positive end signal of the second clock signal; the second clock signal and the first clock signal are clock signals with the same frequency, and a phase difference exists between the second clock signal and the first clock signal; the logic module is connected with the first input stage module and the second input stage module, and when the first clock signal is a rising edge signal, the logic module conducts the reverse output end of the pulse trigger to output a high level signal based on the input signals of the first input stage module and the second input stage module. By accelerating the charging and discharging stages of the pulse trigger, the dead time is shortened, the resolution of the pulse trigger is improved, and static errors are eliminated.

The application discloses a kind of based on navigation star bistatic InSAR's fast data preprocessing method, on the premise of guaranteeing the amplitude and phase accuracy of imaging result, every 1ms echo data is truncated into 50 portions 20us data, and the 20us data corresponding to 1ms reference signal is cross-correlated;50 results obtained by calculation are accumulated again, and the sum obtained is the result of pulse compression;Finally, the final image is obtained using the result of the outcome. The 20us data pulse compression method used changes the size of PRT in the imaging process to speed up the pulse compression speed, which can reduce the difficulty of data processing and the physical cost required for storage under the premise of ensuring the accuracy of imaging results.

The present invention discloses an erbium-doped fiber mode-locked laser with seed injection startup. A seed laser, an energy regulator, a spatial fiber coupler, a spectrum-broadening fiber, a first fiber coupler, and a first filter are sequentially connected to form a seed injection startup device. The first fiber coupler, a first filter, an isolator, a first wavelength division multiplexer, a first erbium-doped fiber, a second fiber coupler, a second filter, a second wavelength division multiplexer, and a second erbium-doped fiber are sequentially connected by fiber fusion to form an all-fiber ring resonator. The all-fiber ring resonator, together with the first and second pump sources, form a mode-locked oscillator. Mode-locked pulse output is achieved through the mode-locked oscillator. The present invention achieves low-cost, efficient, and reliable passive mode-locked startup and high-energy ultrafast pulse generation by regulating and injecting nanosecond pulses emitted by the seed laser into the mode-locked laser.

The application discloses a microwave photon technology-based radio frequency pulse width measuring device and method, belongs to the microwave photon technology field, and solves the problem that the envelope detector is used to measure radio frequency pulse parameters in the prior art, and it is difficult to realize the measurement requirement of the ultra-wideband radio frequency signal; the application utilizes the advantage of the microwave photon technology ultra-wideband signal processing, processes the ultra-wideband radio frequency pulse signal in the optical domain through two kinds of modulation modes, utilizes the beat frequency output of the photoelectric detector to output two low-frequency edge pulse signals, converts the to-be-measured radio frequency pulse signal in the ultra-wideband frequency range into a low-frequency signal range for collection and measurement, and the ultra-wideband, fast pulse width measurement of the ultra-wideband radio frequency signal can be realized without the collection and processing capacity of the high-speed ultra-wideband radio frequency signal.

The present application discloses a pulse transformer that combines high transformation ratio with fast pulse output capability, relating to the technical field of pulse transformers. The transformer comprises an insulating core, a variable impedance wire, and an insulating film wound around the insulating core. The variable impedance wire has a gradually varying width corresponding to the transformation ratio and transmission requirements. The present application has the beneficial effect of gradually varying the variable impedance wire as a conductive layer on the pulse transformer to achieve impedance change. This impedance change causes multiple reflections and transmissions during electromagnetic wave propagation, thereby compressing the pulse width. This allows the pulse transformer to have both high voltage boost capability and fast pulse output capability.

This invention relates to a high-speed signal acquisition system, specifically a single-channel wide dynamic range single fast pulse signal acquisition system, solving the technical problem of acquiring a large dynamic range of a single fast pulse P1. The single-channel wide dynamic range single fast pulse signal acquisition system provided by this invention includes a composite pulse train shaping circuit S1, a data acquisition unit S2, and an acquisition and restoration unit S3. The composite pulse train shaping circuit S1 includes a power divider circuit U1, N attenuation circuits U2, N analog delay circuits U3, and a composite circuit U4, where N is an integer greater than 1. The input terminal of the composite pulse train shaping circuit S1 receives a fast pulse P1, first splits the input fast pulse P1, then delays each of the split circuits, and finally combines them into a pulse train P2. Multiple samplings of the single fast pulse P1 signal are achieved within a short time using a single recording channel. Furthermore, by configuring different attenuation parameters for each split circuit, a large dynamic range of the single fast pulse P1 signal can be acquired.

The invention discloses a high-reliability pulse trigger circuit for radiation field measurement, and solves the problems that an existing pulse trigger circuit is easy to generate false trigger operation, cannot dynamically adjust and lock time parameters on the premise of not changing hardware configuration, and is weak in reliability and poor in flexibility. The circuit specifically comprises a comparison circuit, a self-locking circuit, a narrow pulse generation circuit and a switching circuit. The in-phase input end of the comparison circuit is used for being connected with external analog signal output equipment, the inverted input end of the comparison circuit is used for being connected with an external threshold voltage power supply Vth, and the output end of the comparison circuit is connected with the B input end of the self-locking circuit; the Q1 output end of the self-locking circuit is connected with the A input end of the self-locking circuit and is used for signal closed-loop feedback; the Y output end of the self-locking circuit is connected with the input end of the narrow pulse generation circuit; the narrow pulse generation circuit is used for generating a narrow pulse trigger signal according to the trigger pulse, and the output end is connected with the input end of the switching circuit; the switching circuit is used for outputting a fast pulse trigger signal.

The application relates to a high-voltage pulse electric field ablation device and method, and belongs to the technical field of medical instruments, which solves the problem of long pulse edge and pulse width generated by an existing high-voltage fast switch. The device comprises a high-voltage output module, a capacitor and a control unit. The high-voltage output module comprises a first branch, an additional branch and a second branch which are connected in parallel between a direct-current high-voltage power supply and a grounding end in sequence. The first branch comprises first and second power switches which are connected in series. The second branch comprises fifth and sixth power switches which are connected in series. The additional branch comprises third and fourth power switches which are connected in series. The capacitor is connected between a first node between the first and second power switches and a second node between the third and fourth power switches. The first to sixth power switches are opened and closed to generate a bipolar high-voltage pulse with picosecond or nanosecond rising and falling edges and nanosecond pulse width. The amplitude, rising time, falling time, frequency, pulse width, positive and negative pulse time difference and pulse number of the pulse can be adjusted. The device realizes super-fast pulse rising and falling edges and super-short pulse width.

The invention relates to a low-yield and ultra-fast pulse gamma ray beam pulse width monitoring system and method, in particular to a low-yield and ultra-fast pulse gamma ray beam pulse width monitoring system and method based on back scattering array coincidence detection, and solves the problem that an existing system is difficult to meet the requirement for online real-time monitoring of output pulse width during an LCS beam experiment. The system comprises a scattering target, a coincidence detector array, a coincidence data processing circuit and a power supply circuit for providing a stable power supply, the scattering target is arranged in the beam direction of the pulse gamma ray device; the coincidence detectors are distributed on a ring with the optical axis of the pulse gamma ray device as the central axis. Each coincidence detector comprises a detector shell, and a scintillator crystal, a light guide layer, a silicon photomultiplier SiPM and a SiPM high-frequency readout circuit which are arranged in the detector shell and are connected in sequence; the output end of the SiPM high-frequency reading circuit is connected with the input interface of the coincidence data processing circuit, and the pulse width is obtained and output through the coincidence data processing circuit.

Disclosed herein are device and method embodiments for photodetectors and photodetection. For example, a multi-mode seeker includes an imager having multiple light-sensing elements, each light-sensing element configured to convert photons to photocurrent. Image readout circuitry is electrically interfaced to multiple light-sensing elements and configured to generate image information based on photocurrent of each light-sensing element accumulated over a period of time. Pulse-shape readout circuitry is electrically interfaced to the imager and configured to continually sense photocurrent produced by the multiple light-sensing elements of the imager and generate one or more signals based on the sensed photocurrent. The pulse-shape readout circuitry is configured to operate independently of the image readout circuitry.

The disclosure provides a method and system for multiple symbol-frames to encode and decode each symbol-frame code value in contrast to current schemes of encoding and decoding the symbol-frame code based on evaluating single symbol-frames code for each bitstream value. By evaluating multiple symbol-frames and their relationship to each other to encode and decode each symbol-frame code value, the relationship between the pulse width and symbol-frame width can be varied. The description of the exemplary embodiment maintains the same symbol-frame width with a much wider pulse and encoding and decoding multiple symbols-frames to achieve higher data rate telemetry while maintaining the integrity of a signal. The method and associated software to code and decode multiple symbol-frames and their relationship to each other has demonstrated multiples of increased speed that significantly increases the capability of telemetry communication.

The invention discloses a pulse transformer giving consideration to both high transformation ratio and fast pulse output capability, and relates to the technical field of pulse transformers, the pulse transformer comprises an insulating inner core, a variable impedance line and an insulating film wound on the insulating inner core; the variable impedance line has a gradual change width corresponding to a transformation ratio demand and a transmission demand. The pulse transformer has the advantages that impedance change is achieved through gradual change of the variable impedance line serving as the conducting layer part on the pulse transformer, multiple times of reflection and transmission occur in the electromagnetic wave propagation process through impedance change, pulse width compression is achieved, and therefore the pulse transformer has the high boosting capacity and the fast pulse output capacity at the same time.

This invention discloses a high repetition rate (PRR) fast pulse generation circuit and method based on a pre-triggered front-stage. The pulse generation circuit includes a Marx circuit composed of several stages of charging capacitors. Power switches are provided between each stage of charging capacitors. Each stage of charging capacitor has two sets of isolation resistors and isolation ferrite beads in its circuit. The first stage is an external triggering stage. The power switches are controlled by an external input pulse that is steepened by the triggering circuit. The front-stage circuit is a pre-triggered stage, the intermediate stage is a collector overvoltage conduction stage, and the final stage is a load unit. This pulse generation circuit can effectively reduce the heating phenomenon of the front-stage avalanche transistor and increase the upper limit of the pulse source repetition rate.

The invention discloses a high-temperature and high-pressure ultrafast pulse control valve which comprises a valve body, a valve seat, a valve clack with an air inflation hole and a rotary driving mechanism, and the air inflation hole and a valve seat vent hole are periodically overlapped through rotation of the valve clack to form high-frequency pulse airflow; according to the innovation, a distance fine adjustment mechanism is arranged; a fixing frame is connected with a valve body; a first flow channel pipe is fixed on the fixing frame; the valve seat sleeves the first flow channel pipe and is meshed with the first flow channel pipe through a thread pair, and the valve seat is rotated to drive the valve seat to axially move along the first flow channel pipe; scale marks on the periphery of the valve seat quantify the corresponding relation between the rotation angle and the axial displacement, and precise adjustment of a micro gap smaller than or equal to 0.04 mm between sealing faces is achieved. The gap control bottleneck of a traditional pulse valve under the high-temperature working condition is broken through, the phenomena that noise and sparks are generated due to high-speed rotation of the valve clack are avoided, the leakage rate smaller than or equal to 0.5% at the pulse frequency of 60 Hz is accurately maintained, and the sealing reliability of a fluid scouring test is guaranteed.

This invention relates to a feedback-type high-power electromagnetic pulse (HMP) power supply protection circuit and method, belonging to the field of electromagnetic compatibility (EMC) technology. The circuit includes a feedback sampling unit, a delay unit, and a graded protection unit. The feedback sampling unit samples and compares the pulse voltage amplitude and pulse duration; the delay isolation unit isolates fast pulse signals, maintaining the integrity of the pulse in the sampling circuit and protecting the protection circuit and downstream equipment when the pulse is too long; the graded protection unit provides separate protection for fast-edge narrow pulses and long-duration pulses. The feedback sampling unit includes a voltage amplitude sampling circuit and a pulse duration sampling circuit. The graded protection unit includes a first-stage fast-response branch and a second-stage discharge branch. This invention is applied to high-power electromagnetic pulse protection for DC and AC power ports. From the perspective of graded protection, different protection schemes are selected according to the pulse characteristics to maximize the safety of the power supply system and downstream equipment.

The present application discloses an electron beam deflection pulse generating device for a transmission electron microscope, which is applied to the objective lens system of the transmission electron microscope, and includes a square wave pulse module and a negative pulse generating module; the square wave pulse module is used to send a square wave trigger pulse signal of a preset frequency to the negative pulse generating module according to the characteristics of the sample to be tested; the negative pulse generating module is used to perform waveform processing on the square wave trigger pulse signal to obtain a negative pulse output signal with a bias voltage; wherein the negative pulse output signal is used to change the incident angle of the electron beam and the number of incident electrons. The present invention can generate a fast pulse signal with a DC bias voltage and a narrow pulse width, so that the electron beam is deflected under the action of the DC bias voltage without being irradiated on the sample; when the fast pulse arrives, the electron beam is irradiated on the sample in a very short time when the pulse occurs, which can protect the sample and extend the service life of the sample.

The invention belongs to the technical field of instrument application, and provides a multipath synchronous fast rising edge pulse generation device, which comprises an input trigger pulse conditioning circuit, an FPGA (Field Programmable Gate Array) module, a program control pulse delay circuit, a multipath fast pulse signal generation circuit based on an avalanche triode, a multipath clock fan-out buffer and a time-to-digital conversion circuit, the FPGA is combined with the program control pulse signal delay circuit to generate picosecond-level delay trigger pulses, the avalanche triode-based fast pulse signal generation circuit is triggered to generate fast rising edge pulse signals, high-amplitude pulse signal output is generated, and the driving capability is ensured; moreover, the time difference between the output synchronization pulse and the reference pulse is measured through the time-to-digital conversion circuit, and the trigger pulse delay of each avalanche transistor fast pulse signal generation circuit is adjusted through the FPGA and the program control pulse signal delay circuit, thereby achieving the synchronization adjustment of each pulse. The problem that the synchronism of multiple paths of pulses becomes poor due to changes of factors such as temperature and power supply voltage is effectively solved.

The invention provides a modularized, low-inductance and high-reliability composite pulse power supply assembly, so as to solve the problems of complex system, high cost, limited performance, switching disturbance and the like caused by discrete design of a fast pulse power supply and a quasi-steady-state power supply in an existing theta-pinch device. Through standardized and integrated mechanical and electrical design, hardware unification of two power supply topologies is realized, loop parasitic inductance is reduced, seamless transition from pulse to steady-state current is ensured, and finally the core targets of improving plasma experiment performance, simplifying system architecture and reducing full life cycle cost are achieved.

The invention discloses a neutron spectrum and pulse shape discrimination calculation system and method realized by peak detection. The system comprises a neutron detection module, an analog signal processing module, an analog-to-digital conversion module and a logic and signal processing module. The analog signal processing module carries out parallel processing on the electric pulse signal to obtain slow component integral voltage and original fast pulse waveform voltage. The analog-to-digital conversion module synchronously collects the two paths of signals. The logic and signal processing module is realized based on a programmable logic chip, carries out filtering and baseline recovery on an original waveform, carries out peak detection on an integral voltage to obtain energy, and calculates pulse shape discrimination parameters by extracting time characteristics of the recovered waveform under at least two voltage thresholds. Therefore, real-time discrimination of neutrons and gamma photons is realized. According to the invention, energy spectrum measurement and particle discrimination functions are deeply integrated, the problems of high cost, poor synchronism and complex calculation of a traditional scheme are solved, and high-precision and integrated neutron detection is realized.

The present invention proposes a fast pulse period estimation method based on phase difference correction. The method comprises: step one, determining the mapping relationship between the folded waveform phase difference and the period estimation error; step two, folding the waveform in time periods and calculating the folded waveform phase difference, and calculating the period estimation error according to the mapping relationship; step three, setting an accuracy threshold, and when the folded waveform phase difference meets the accuracy threshold, calculating the pulse period estimation value according to the period estimation error. Compared with the traditional epoch folding period estimation method, the present invention greatly improves the calculation speed, and at the same time is comparable to the prior art in accuracy, is insensitive to the observation duration, and is of great significance for on-orbit real-time pulse reception period estimation.

Disclosed herein are device and method embodiments for photodetectors and photodetection. For example, a multi-mode seeker includes an imager having multiple light-sensing elements, each light-sensing element configured to convert photons to photocurrent. Image readout circuitry is electrically interfaced to multiple light-sensing elements and configured to generate image information based on photocurrent of each light-sensing element accumulated over a period of time. Pulse-shape readout circuitry is electrically interfaced to the imager and configured to continually sense photocurrent produced by the multiple light-sensing elements of the imager and generate one or more signals based on the sensed photocurrent. The pulse-shape readout circuitry is configured to operate independently of the image readout circuitry.

The invention provides a steep edge ultrafast pulse train laser control device and a using method, and relates to the technical field of lasers, the steep edge ultrafast pulse train laser control device comprises an ultrafast seed source, a high-speed amplitude modulator, a pulse amplification module, a high-power amplitude modulation module and a signal driving module, the high-speed amplitude modulator is used for performing primary amplitude modulation on the laser pulse output by the ultrafast seed source and respectively generating a pre-pulse and a main pulse; the high-speed amplitude modulator is connected with the pulse amplification module; the pulse amplification module is connected with the high-power amplitude modulation module, the high-power amplitude modulation module is used for carrying out secondary amplitude modulation on the amplified pre-pulse and main pulse, and the pre-pulse is cut off, so that the high-power amplitude modulation module only outputs the main pulse; the signal driving module is electrically connected with the high-speed amplitude modulator and the high-power amplitude modulation module. According to the invention, the pulse flatness and the steep edge characteristic of the output ultrafast pulse string laser can be ensured.

The application discloses an AC power meter power frequency magnetic field no-load test method, system and storage medium, which saves the time for the AC power meter to perform the power frequency magnetic field no-load test. The method comprises the following steps: when the AC power meter is placed under a preset power frequency magnetic field condition, a test voltage is applied to the AC power meter, so that the AC power meter normally works; the value in a fast pulse counter is read, and the time required for the value in the fast pulse counter to increase by 1 is determined; the value in a pulse frequency register is read; the fast pulse counter and the pulse frequency register both belong to the components of a metering chip of the AC power meter; according to the time and the value in the pulse frequency register, the time tQ required for the AC power meter to generate one pulse is calculated; and if tQ is greater than a preset time, it is determined that the AC power meter power frequency magnetic field no-load test is qualified.

The invention discloses a carbon dioxide laser output control method for preventing electrical fast pulse train interference, and relates to the technical field of anti-electromagnetic interference control of laser equipment, and the method comprises the following steps: S1, collecting complete waveform data of a redundant coding control signal, constructing a multi-cycle dynamic signal trajectory model, and constructing a multi-cycle dynamic signal trajectory model; extracting disturbance boundary characteristics under electrical fast pulse train interference, and generating a disturbance analysis reference; and S2, setting a multi-level interference judgment threshold value with time resolution capability based on a disturbance analysis reference, identifying repeated self-recovery response caused by interference in combination with the continuity of a signal track, and generating an interference identification mark. According to the invention, by dynamically extracting control signal disturbance characteristics, setting a multi-level judgment threshold and introducing a rhythm control mechanism, logic oscillation caused by interference is effectively identified and inhibited, stable output and efficient recovery of the laser in an interference environment are realized, and the reliability and the immunity of the system are improved.

The present disclosure provides a method of an ultrafast-pulsed laser deposition and a device thereof, wherein a single emitted femtosecond pulse is split, and the split pulses are synchronized in the time domain, and then coupled with each other to form a plasma grating or lattice to excite the target material once; then multiple pulsed lasers are sequentially coupled multiple times with the plasma gratings or lattices to excite the target material multiple times, and the excited target material is deposited and reacted on the substrate to form a thin film.