21 results about "Excitation pulse" patented technology

The application discloses a portable fluorescence lifetime detection device based on a SiPM array and an on-chip TDC, and relates to the technical field of fluorescence lifetime detection devices, and comprises the following modules: an excitation light source module, which is used for sending a synchronous electric pulse signal to a time measurement module while triggering a sub-nanosecond excitation pulse, the signal being a starting timing signal for time measurement of the time measurement module, and the excitation pulse being used for exciting a sample to be measured to generate a fluorescence signal; a detection module, which is used for collecting the fluorescence signal and obtaining a photon detection signal, and outputting each photon detection signal to the time measurement module; the time measurement module, which is used for measuring a time interval from the synchronous electric pulse signal to each photon detection signal to generate a timestamp sequence and then sending the timestamp sequence to a data processing and control module; and the data processing and control module, which is used for generating a fluorescence decay curve and a fluorescence lifetime prediction result of the sample according to the timestamp sequence. The application can meet the application requirements of portability, low cost, high stability and high accuracy.

The present application relates to the technical field of gas turbine control, and discloses a heavy gas turbine fuel flow stability control method and device, comprising obtaining pressure temperature and component parameters, calling Joule-Thomson coefficient and real gas state equation, and calculating fluid thermodynamic parameters considering throttling effect; based on the parameters, parent pipe pressure and target flow, generating anti-blocking target pressure and calculating steady-state basic opening degree instruction; performing differential operation on intermediate pipe cavity pressure, and converting to generate dynamic feedforward compensation; determining static friction dead zone risk and generating asymmetric excitation pulse signal; superimposing the steady-state basic opening degree instruction, feedforward compensation and excitation pulse signal to generate the final control instruction. The present application improves the accuracy of flow calculation under low load conditions, avoids aerodynamic choking, and overcomes static friction and suppresses flow fluctuations through dynamic feedforward and excitation compensation, thereby improving the operating stability of the gas turbine.

An apparatus for multiphoton parallel transmission for magnetic resonance imaging (MRI) of a subject, includes a radio frequency (RF) transmit coil, a single-channel universal excitation coil positioned outside of the RF transmit coil, and a processor device coupled to the RF transmit coil and the single-channel universal excitation coil. The RF transmit coil is configured to perform at least one RF excitation pulse of a multiphoton parallel transmit excitation comprising a multiphoton excitation pulse configured to correct spatial inhomogeneities and the single-channel universal excitation coil is configured to perform a low-frequency excitation pulse of the multiphoton excitation pulse. The processor device is configured to control current waveforms provided to the RF transmit coil to perform the at least one RF excitation pulse and to control current waveforms provided to the single-channel universal coil to perform the low frequency excitation pulse of the multiphoton excitation pulse.

The application discloses a system and method for pile foundation quality detection, and relates to the technical field of pile foundation quality detection, and solves the problems of difficulty in determining the optimal excitation energy range, deviation of damage quantization criteria, and low reliability of detection results, wherein the application randomly distributes excitation pulses with different energies to different excitation areas, ensures that each energy is excited only once in one area and the same area is not continuously used, combines with environment monitoring and correction during resetting, effectively eliminates the cumulative effect of previous excitation and environmental interference, obtains pure damage increment data, identifies the inflection point of the damage increment-energy curve, takes the inflection point energy as the critical excitation energy of the depth, takes the minimum value and the maximum value of all depths to form an adaptive detection energy window, and fundamentally solves the technical problems of difficulty in determining the excitation energy range and contradiction between detection results of the same pile under different energies.

The invention relates to a computer-implemented method for processing a magnetic resonance data set, the magnetic resonance data of which are recorded in k-space at various k-space positions, which are sampled along a k-space trajectory using a magnetic resonance sequence, with a magnetic resonance device in a recording operation, wherein the spatial resolution of the magnetic resonance data set in the image space is increased. - a resolution enhancement function, especially one that has been trained, is applied to a low-resolution base image reconstructed from the magnetic resonance data in order to obtain a higher-resolution intermediate image, - an intermediate data set in k-space is determined from the intermediate image by means of a Fourier transform, - to obtain a target dataset, the portions of k-space covered by the magnetic resonance data of the magnetic resonance dataset in k-space are replaced by the magnetic resonance data in the intermediate dataset, and - a higher resolution target image is reconstructed and provided from the target dataset, whereby - in a correction process at least one edge height (7) is reduced at at least one boundary between the sampled k-space (2) and an extension component (3) of the k-space that extends the originally sampled k-space (2) due to the increase in resolution, which edge height (7) occurs due to intensity weights in the magnetic resonance data set because of the time of sampling of a respective k-space position after a high-frequency excitation pulse during the magnetic resonance sequence, wherein the intensity weights are not present in the extension component (3).

The utility model provides an ultrasonic detection circuit for rain and water level integrated machine, provides high pressure excitation pulse signal to the transmitting and receiving integrated rain ultrasonic probe and water level ultrasonic probe, it includes a controller of providing PWM1 and PWM2 signal, still includes: half bridge inverter circuit is used to the direct current voltage VDC input to half bridge drive chip U1 is inverted into square wave voltage PowSW, voltage dividing transformer circuit produces high voltage pulse signal HvSig, excitation pulse generation circuit is used to produce high voltage excitation pulse signal TransducerSig, and is connected water level ultrasonic probe JP1 and rain ultrasonic probe JP2. Through the technical scheme provided by the utility model embodiment, two probes can be simultaneously driven through a circuit, thereby realizing the detection of rain and water level, through the technical scheme, the depth multiplexing and integration of the two are realized from the circuit structure, and the measurement of rain intensity and rain is realized by directly using the rain gauge cylinder scheme, and the volume is greatly reduced.

The application discloses a kind of super wide band electromagnetic radiation environment field uniform area fast estimation method, belong to electromagnetic field and microwave technical field, to solve the technical problem that present super wide band electromagnetic environment field uniform area calculation method is long in time, cost is high, workload is big, not suitable for the technical problem of fast application in experimental site.The method takes the radiation aperture area of super wide band pulse radiation system and the time parameter of excitation pulse waveform as input, realizes the fast estimation to the 3dB field uniform area and boundary of super wide band electromagnetic radiation environment by the calculation method obtained based on aperture radiation theory.The application can quickly determine the super wide band electromagnetic irradiation uniform area in experimental site without complex numerical calculation or experiment, provide reference for electronic information system electromagnetic vulnerability experiment layout, electromagnetic safety area division and the like, and then improve the efficiency of field experiment.The method can also help the design, engineering application and performance evaluation of super wide band pulse radiation system.

This application relates to the field of temperature detection technology, specifically to a method, device, and system for detecting the temperature of cable joints in power distribution networks. The method includes: periodically transmitting excitation pulses at a preset carrier frequency to the cable joint to acquire all original surface acoustic wave (SAW) signals contained within a preset measurement period; calculating the waveform distortion value of each original SAW signal to determine a first interference degree characterizing multipath signal superposition interference; calculating the frequency offset of each original SAW signal to determine a second interference degree characterizing mechanical stress interference; determining the interference coefficient of the measurement period to dynamically set the decision threshold of a decision feedback equalizer, thereby equalizing the original SAW signals to obtain the equalized SAW signal, and calculating the temperature of the cable joint. This application can significantly improve the accuracy and reliability of cable joint temperature detection.

The application discloses an asymmetric magnetic isolation driving system and method suitable for SiC MOSFETs, positive and negative pulses with amplitudes of Vgp1 and Vgp2 are generated by a power supply and a main control module, and the positive pulse width P applied to the primary winding of the magnetic isolation module is accurately controlled W‑Vgp1 and the negative pulse width P W‑gp2 , so that the volt-second products of the two are equal, thereby realizing the asymmetry of the output voltage amplitude under the premise of ensuring that the magnetic core is not saturated and effectively reset. The scheme successfully solves the inherent contradiction that the traditional magnetic isolation transformer requires symmetrical excitation pulses to maintain the balance of magnetic flux, and the SiC MOSFET gate drive needs asymmetric double-level voltage (such as positive voltage conduction and negative voltage turn-off), which not only ensures the stable work of the magnetic isolation device, but also meets the specific driving needs of the SiC power device.

This invention relates to the field of gas turbine control technology, and discloses a method and device for stable fuel flow control in heavy-duty gas turbines. The method includes acquiring pressure, temperature, and component parameters; calling the Joule-Thomson coefficient and the real gas law to calculate fluid thermodynamic parameters considering throttling effects; generating an anti-blocking target pressure and calculating a steady-state basic opening command based on these parameters, the main pipe pressure, and the target flow rate; performing differential calculations on the intermediate pipe pressure to generate a dynamic feedforward compensation; determining the risk of static friction dead zones and generating an asymmetric excitation pulse signal; and superimposing the steady-state basic opening command, the feedforward compensation, and the excitation pulse signal to generate the final control command. This invention improves the accuracy of flow calculation under low-load conditions, avoids aerodynamic blockage, and overcomes static friction and suppresses flow fluctuations through dynamic feedforward and excitation compensation, thereby enhancing the operational stability of the gas turbine.

A method for generating a magnetic resonance image of a subject using a magnetic resonance imaging (MRI) system includes receiving, using the MRI system, at least one parameter for a multiphoton parallel transmit excitation comprising a multiphoton excitation pulse configured to correct spatial inhomogeneities and performing, using the MRI system, a pulse sequence comprising the multiphoton parallel transmit excitation to acquire data from the subject. The multi photon excitation pulse of the multi photon parallel transmit excitation is performed using a radio frequency (RF) coil and a set of one or more shim coils of the MRI system. The method further includes generating, using a processor, an image of the subject using the acquired MR data. In some embodiments, the multiphoton excitation pulse includes an off-resonance RF excitation pulse performed using the RF coil and a plurality of low-frequency excitation pulses performed using the set of one or more shim coils. The plurality of low-frequency excitation pulses are performed simultaneously with the off-resonance RF excitation pulse.

A method for magnetic resonance imaging is provided herein. The method includes acquiring magnetic resonance data from a subject using a magnetic resonance imaging (MRI) system to sample a hybrid space along a zigzag trajectory. The hybrid space comprises a first axis along a temporal dimension and a second axis along a phase-encoding k-space dimension. The data acquisition involves, for each slice of a plurality of slices, consecutively acquiring all shots of a multi-shot acquisition for the slice before acquiring data for a next slice, with each shot using a radio frequency (RF) excitation pulse having a different flip angle. The method further includes reconstructing images from the acquired magnetic resonance data.

This application relates to a multi-timescale energy management method for energy storage power stations, comprising the following steps: injecting wideband small-amplitude excitation pulses into the battery clusters during the dead time of charge-discharge switching of the energy storage converter and simultaneously acquiring voltage response signals; performing a fast Fourier transform on the voltage response signals to extract a wideband electrochemical impedance spectrum; adaptively selecting an equivalent circuit model based on the current SOC value to perform online fitting of the electrochemical impedance spectrum to obtain key aging parameters; dynamically generating a safety scheduling boundary based on the real-time change rate of the key aging parameters, the safety scheduling boundary including the maximum allowable charge-discharge power and the available SOC range; embedding the safety scheduling boundary as a constraint condition into a multi-timescale optimization scheduling model to generate scheduling instructions for each battery cluster. This application achieves synergistic optimization of battery life protection and power station economic benefits, improving the full life-cycle economic efficiency and operational safety of energy storage power stations.

The present disclosure relates to device tracking. Described is an improved passive marker device (10). The passive marker device (10) comprises a coil element (12), a mechanical resonator (14), and a circuit element (16). The coil element is coupled to the mechanical resonator for producing a response signal having an operating frequency corresponding a mechanical resonating frequency of the mechanical resonator and a signal decay having a decay time constant in response to an excitation pulse, wherein the excitation pulse is a magnetic or electromagnetic excitation pulse. The circuit element is configured to limit a power transferred to the mechanical resonator when the at least one excitation pulse has an excitation amplitude equal to or greater than a threshold value.

The application relates to the technical field of sensors. In view of the problem of inaccurate measurement information of a displacement sensor in remote displacement detection in the prior art, the application provides a displacement sensor and a distance measuring device. The displacement sensor comprises a shell, the shell comprising a base body, a base and a top cover; the base body is a hollow cavity structure with two open ends; the base and the top cover are arranged at the two open ends of the base body; a main body is arranged in the shell; the main body comprises a circuit board, a filter board, a pulse board, a sensitive element and a mounting bracket; the circuit board and the pulse board are connected; the pulse board and the sensitive element are connected; the filter board and the circuit board are connected; a measuring rod assembly comprises a measuring rod, a position sensing element and a magnetic ring; the position sensing element is arranged in the interior of the measuring rod, the magnetic ring is sleeved on the outer periphery of the measuring rod and can move along the measuring rod. The displacement sensor can generate an excitation pulse during detection and filter out interference signals, thereby facilitating improvement of the measurement accuracy.

This application discloses a miniature engraving machine, comprising a pumping system and an optical resonant cavity arranged in sequence. Pump light generated by the pumping system enters the optical resonant cavity to excite a pulsed laser, which oscillates within the cavity. The miniature engraving machine also includes a frequency conversion unit and a collimation scanning system. The frequency conversion unit includes a frequency-doubling crystal converter and a short-pass filter, with the short-pass filter positioned outside the optical resonant cavity. The collimation scanning system includes a collimation system, a scanning galvanometer, and a field mirror arranged in sequence. The frequency-doubling crystal converter is positioned either inside or outside the optical resonant cavity. The pulsed laser, after oscillating within the cavity, is converted into green pulsed light after passing through the frequency-doubling crystal converter and the short-pass filter. Through this method, this application solves the problems of large size, high cost, and complex internal structure inherent in existing dual-wavelength miniature engraving machines.

This invention relates to a high-efficiency, low-cost bipolar high-power pulsed magnetron sputtering power supply with excitation pulse, belonging to the field of vacuum magnetron sputtering ion plating technology. It includes a high-voltage negative sputtering power supply, a low-voltage positive bias power supply, a pulsed excitation power supply, an energy clamping network, and a pulsed excitation network. The energy clamping network is connected between the inverter bridge and the output terminal to absorb and clamp the reverse electromotive force when the switching devices are turned off, limiting the voltage across each switching device in the inverter bridge to near the DC power supply voltage, thus reducing the device withstand voltage requirements and cost. The pulsed excitation network is connected in series between the output terminal and the load to superimpose an excitation pulse at the beginning of the negative sputtering pulse to excite plasma discharge, improving the target ionization rate and suppressing arcing. This invention reduces device cost and power redundancy, improves power supply efficiency and discharge stability, and enhances ion diffraction by applying a positive voltage through the low-voltage positive bias power supply to neutralize the target surface charge, thereby improving the coating quality.

This invention discloses an adaptive denoising and signal enhancement device and method for deep-earth robot TEM (Transient Transmission) signals, belonging to the field of deep-earth space exploration technology. The device includes a deep-earth mobile robot platform, a TEM excitation pulse transmission module, a transmitting coil, an array of receiving coils, a motion state and environment sensor group, a central processing and control unit, and a closed-loop control and measurement point optimization module. The method achieves real-time adaptive denoising and enhancement of deep-earth TEM detection signals through independent dual modeling of robot motion noise and deep-earth environmental noise, adaptive combination of multi-frequency excitation and array reception, AI denoising reconstruction with physical constraints, closed-loop measurement point and excitation optimization, and multi-robot collaborative detection. This invention effectively suppresses robot motion coupling noise and non-stationary deep-earth environmental noise, improves the TEM signal-to-noise ratio and the accuracy of underground conductor inversion, and adapts to the full-process requirements of unmanned and intelligent deep-earth exploration.

This invention belongs to the field of laser countermeasures and multi-physics field synergistic damage technology, specifically involving a femtosecond laser plasma shock wave enhanced UAV electromagnetic damage device. The device includes: acquiring the target surface dielectric impedance characteristics and radiation path distribution information to generate an initial excitation parameter set; controlling an ultrafast laser source to output a first ionization pulse and a second excitation pulse with a preset micro-delay interval; projecting the first ionization pulse to induce avalanche ionization and construct a transient plasma layer; injecting the second excitation pulse to drive the plasma adiabatic expansion and release a directional ultra-high pressure shock wave; acquiring the shell micro-deformation field and broadband electromagnetic leakage signal, and performing wavefront phase-matching injection; dynamically reconstructing the pulse time domain and energy ratio based on the synergistic evaluation results until a preset hardware deactivation criterion is met. This invention can solve the problem that single-mode damage is difficult to penetrate composite protective layers.

The application relates to the technical field of ultrasonic flaw detection, in particular to an ultrasonic flaw detection method and system based on pulse reflection, which has the technical scheme as follows: S1, collecting real-time vibration information and temperature information of a measured body; S2, constructing a propagation disturbance representation model based on the information in S1; S3, generating a compensation excitation pulse; S4, emitting the compensation excitation pulse; S5, collecting echo signals and obtaining residual signals through matched filtering and cross-correlation processing, and updating phase correction amounts and amplitude coefficients based on the signals and reference echoes to realize closed-loop compensation; the application collects vibration, temperature and geometric data through multiple sensors, constructs a propagation disturbance model and dynamically calculates phase correction amounts and amplitude weighting coefficients, compensates for environmental influences, generates a compensation pulse, emits and processes echo signals using an array transducer, realizes high-precision defect detection, adopts a closed-loop control mechanism, automatically adjusts flaw detection parameters based on residual estimation and feedback, and ensures stability.

The present application provides an anti-theft system of an acoustic magnetic (AM) method capable of expanding the allowable range of the resonance frequency of a tag. The anti-theft system of the acoustic magnetic method includes a transmitting section 20, a tag 10, a receiving section 30, and a tag detection processing section 42. The transmitting section 20 transmits an excitation pulse signal during a transmission period. The tag 10 resonates due to the excitation pulse signal transmitted from the transmitting section 20 and outputs a ring-down signal. The receiving section 30 receives the ring-down signal during a reception period after the transmission period. The tag detection processing section 42 detects the tag 10 based on the ring-down signal received by the receiving section 30. The transmission period in which the excitation pulse signal of the 57 kHz band is transmitted and the transmission period in which the excitation pulse signal of the 58 kHz band is transmitted are included in each certain period.