27 results about "Broadband pulse" patented technology

The invention relates to the technical field of audio processing and automobiles, discloses a sound synthesis method, device and system, a vehicle and a medium, and is used for solving the problem that when audio is spliced, instantaneous broadband pulse signals are generated, splicing transition is not coherent, and consequently sonic boom occurs during playing. The method comprises the following steps: acquiring N audio clips needing to be spliced, wherein N is greater than or equal to 2; according to a pre-debugged window function adjustment parameter, adjusting a window function curve shape at the splicing part of the audio clips; and according to the shape of the window function curve at the splicing part of the audio clips, correspondingly splicing the audio clips needing to be spliced in the N audio clips to obtain a synthesized audio.

This application provides a method and system for locating low-frequency broadband pulse signals under unknown environmental information. The method includes: obtaining the broadband wavenumber spectrum of the pulse signal using a hypothetical dedispersion formula; obtaining preliminary estimates of each mode using a variational Bayesian method; searching for optimal waveguide invariants and reference sound velocities; re-estimating each mode; and finally, substituting the wavenumber and phase information of each mode into a distance estimation cost function to estimate the distance to the pulse source. The advantages of this application are: by using the dedispersion formula and the variational Bayesian method, mode separation of broadband pulse signals can be achieved even with a short horizontal array aperture; and the phase difference between different modes can be used to estimate the source distance. Through this method, the optimal waveguide invariants and reference sound velocities can be searched under conditions lacking environmental information, reducing the error in source distance estimation.

This invention relates to the field of optical inspection technology, specifically to a micro LED wafer-level rapid defect localization system based on photoluminescence. A broadband pulse excitation module outputs pulsed laser light matching the characteristics of the material under test; a two-dimensional scanning platform carries the wafer and achieves nanometer-level precise positioning; a time-resolved acquisition module collects fluorescence signals and converts them into time-resolved photoluminescence data; a data processing and control module synchronously controls the operation of each module, receives and processes the time-resolved photoluminescence data, extracts the transient luminescence intensity and carrier lifetime of each detection point, compares the two-dimensional feature vector formed by these two parameters with a preset defect feature database, identifies the defect type of each micro LED chip, and generates a wafer-level defect fingerprint spectrum. This system can accurately distinguish different types of failure modes such as epitaxial defects, surface state defects, and poor electrode contact, significantly improving detection efficiency and defect classification accuracy.

The invention discloses an on-line measuring device and method for a high-energy broadband pulse laser light field and a far-field focal spot. Broadband pulse laser generated by a high-energy laser device is processed by an intensity attenuation system and then reaches a light splitting element; the light beam penetrating through the spectroscope penetrates through a coding plate, the coding plate is used for carrying out coding modulation on the light beam, and then a table array light intensity detector is used for recording the intensity of a single-frame diffraction image formed after modulation of the coding plate; and the spectral data of the light beam reflected by the light splitting element is recorded by a spectral analysis unit. The near-field complex amplitude (intensity and phase) distribution of a to-be-measured high-energy broadband pulse laser light field can be accurately reconstructed through a multi-mode light field reconstruction algorithm by means of single-frame diffraction image intensity recorded on line by an area array light intensity detector and single-time spectrum data recorded on line by a spectrum analysis unit, and meanwhile far-field focal spot distribution can be obtained through inversion. The method has the advantages of simple structure, low cost, strong environment anti-interference capability and the like.

The invention discloses a broadband achromatic programmable electromagnetic camouflage device based on a fluid access metasurface. The broadband achromatic programmable electromagnetic camouflage device comprises the fluid access metasurface composed of a plurality of periodically arranged super units. Each super unit comprises a plurality of units arranged in a matrix; each unit comprises a microfluid channel layer and a solid metal layer, and the microfluid channel layer is located above the solid metal layer; the microfluid channel layer is connected to an external driving system through the injection and discharge port, and the external driving system is used for injecting liquid metal or dielectric liquid into the microfluid channel layer; when the microfluid channel layer is filled with liquid metal, the unit is in a first working state; and when the micro-fluid channel layer is filled with the dielectric liquid, the unit is in a second working state. According to the invention, linear phase dispersion control can be realized in a broadband, and it is ensured that the generated false target echo keeps high fidelity in a time domain when facing a broadband pulse radar.

This application provides a method, apparatus, medium, and equipment for locating cable defects based on a terminal grounding wire. The method includes: injecting a broadband pulse current signal with a predetermined repetition frequency into the cable grounding wire at the terminal connection of an in-service cable; acquiring the current signal from the cable grounding wire; and analyzing and diagnosing the current signal in the time or frequency domain to locate potential defects in the in-service cable. This application can solve the problems of needing to disconnect the cable system topology, exposing cable cores, and poor on-site anti-interference capabilities when diagnosing faults.

The invention provides a semiconductor laser power supply based on linear constant current and a design method thereof, and relates to the technical field of lasers. The system comprises a front-stage charging network and a rear-stage discharging network, wherein the rear-stage discharging network is connected with the front-stage charging network; the post-stage discharge network comprises a voltage reference calibration module, a linear constant current driving module, a broadband pulse control module, an intelligent power switch module, a high-precision sampling feedback module and a multiple follow current protection module. The input end of the voltage reference calibration module is connected with external reference voltage, and the output end is connected with the linear constant-current driving module; the linear constant-current driving module is connected with the broadband pulse control module; the broadband pulse control module is connected with the intelligent power switch module; the intelligent power switch module is connected with the semiconductor laser load. According to the invention, accurate current control can be realized, and current impact during mode switching is avoided.

An apparatus, including: an oscillator configured to generate a clock signal; a clock signal synthesizer configured to generate a first clock signal, a second clock signal, and a third clock signal, wherein the first, second, and third clock signals are based on the clock signal; a baseband transmitter configured to generate a transmit baseband digital signal in response to the first clock signal; an ultra-wideband (UWB) pulse digital-to-analog converter (DAC) configured to generate a UWB pulse signal based on the transmit baseband digital signal in response to the second clock signal; and a frequency upconverter configured to frequency upconvert the UWB pulse signal to generate a transmit radio frequency (RF) signal based on the third clock signal.

The invention discloses a miniaturized ultra wide band antenna, a UWB positioning terminal and a positioning method thereof. The antenna comprises a dielectric substrate, a radiation unit, a grounding plate and an excitation source, wherein the radiation unit, the grounding plate and the excitation source are stacked on the same outer surface of the dielectric substrate; the grounding plate and the radiation unit are arranged at intervals; the excitation source is arranged between the radiation unit and the grounding plate, and is electrically connected with the radiation unit and the grounding plate. The grounding plate and the radiation unit form a radiation loop, a first ultra-wideband pulse electric signal generated by the excitation source is converted into a first electromagnetic pulse signal, and the first electromagnetic pulse signal is emitted to the space; and a second electromagnetic pulse signal reflected by the positioning target in the space is converted into a second UWB pulse electric signal and the second UWB pulse electric signal is transmitted to the excitation source, so that the UWB positioning terminal obtains the positioning information. The antenna is compact in structure and low in cost, the optimal balance among the size, the cost and the regulation compliance is ensured, and the UWB terminal equipment is promoted to develop in a more compact, more economical and more compliant direction.

The invention relates to a high-speed optical fiber Fabry-Perot sensor demodulation method and system based on photon time stretching. The method comprises the following steps: emitting a broadband pulse light signal through a pulse broadband light source; transmitting the broadband pulse optical signal to an optical fiber Fabry-Perot sensor, sensing physical quantity by the optical fiber Fabry-Perot sensor, and generating a frequency domain Fabry-Perot interference signal containing cavity length information; transmitting the frequency domain Fabry-Perot interference signal to a time stretching element, and mapping the frequency domain Fabry-Perot interference signal from a frequency domain to a time domain to obtain a time domain Fabry-Perot interference signal; performing photoelectric conversion and acquisition on the time domain Fabry-Perot interference signal to obtain a digital electric signal; and tracking the time domain characteristic change of the time domain Fabry-Perot interference signal, and demodulating the cavity length of the optical fiber Fabry-Perot sensor. According to the method, high precision of frequency domain interference and high speed of time domain acquisition are combined, and Doppler errors in dynamic measurement are avoided, so that high-speed, high-precision and high-dynamic demodulation of the cavity length of the optical fiber Fabry-Perot sensor is realized.

The application provides a cable defect positioning method and device based on a grounding lead at an insulation joint, a medium and equipment. The grounding lead is connected between an insulation joint of adjacent two cable sections of each phase cable in a three-phase cable in service and a grounding box, and the grounding box includes a cross-interconnected grounding box or a straight-through grounding box. The method includes: injecting a broadband pulse signal with a predetermined repetition frequency into the grounding lead at the insulation joint of the adjacent two cable sections; collecting a current signal of the grounding lead; and analyzing and diagnosing the current signal in a time domain or a frequency domain to position hidden defects of the cable. The application breaks through the limitation that a traditional detection must remove transposition copper bars or short-circuiting bars in the grounding box, directly uses the grounding lead at the insulation joint for testing, maintains the complete topology of the cable system, and greatly shortens the maintenance time.

This invention discloses a microscopic transient angle-resolved reflection / transmission spectroscopy measurement system based on a streak camera, belonging to the field of microscopic angle-resolved spectroscopy measurement. The invention includes a reflection excitation optical path, a transmission excitation optical path, a collection optical path, and a microscopic illumination module. The reflection / transmission excitation optical path converts a pulsed laser source into a broadband pulsed white light source and focuses it onto the sample surface. The collection optical path achieves time resolution through a streak camera, angle resolution through a pinhole on the k-space plane, and wavelength or energy resolution through a grating. The microscopic illumination module illuminates the sample to determine its position. This invention can acquire transient angle-resolved spectra at different times, analyze the ultrafast dynamics of angle-resolved spectra, and simultaneously acquire information in three dimensions: time, angle, and wavelength. By analyzing the light signal from these three dimensions, it can comprehensively analyze the sample's response to the excitation light and thus determine the coupling state between light and matter in the sample.

The invention belongs to the technical field of pulse signal measurement, and particularly discloses a broadband pulse signal measurement system and method based on heterodyne electro-optical sampling, and the method comprises the steps: a laser light source outputs a laser pulse signal, and the laser pulse signal is divided into two paths after passing through an optical beam splitter, one path excites a photoelectric broadband pulse signal generator to generate a measured broadband pulse signal after passing through a focusing lens, the measured broadband pulse signal is collimated by a collimating lens, and the propagation path of the measured broadband pulse signal is adjusted by using an off-axis parabolic mirror, so that the measured broadband pulse signal is incident into an electro-optical crystal at a Cerenkov incident angle; the other path serves as probe light and irradiates an electro-optical crystal after passing through a reflector and a focusing lens, in the electro-optical crystal, the probe light and a measured broadband pulse signal interact to generate a differential signal and a sum frequency signal, the differential signal and the sum frequency signal are collimated through a collimating lens, and the differential signal is extracted through a diffraction grating and an optical slit; after being collimated, the signal is detected by the photoelectric detection module, and the waveform information of the measured broadband pulse signal is obtained by measuring by using the phase-locked amplification module.

The invention belongs to the technical field of broadband pulse generation, and particularly relates to a fault positioning system and method based on a broadband pulse generation circuit, and the system comprises a broadband pulse generation circuit module, a high-frequency transmission line module, and an upper computer module. The broadband pulse generation circuit module is connected with the high-frequency transmission line module, and the high-frequency transmission line module is connected with the upper computer module through an Ethernet interface. The broadband pulse generation circuit module comprises an FPGA module, a signal input and level conversion module, a broadband signal conditioning module, a signal output module and a power conversion module, the signal input and level conversion module is connected with the FPGA module, and the broadband signal conditioning module is connected with the signal input and level conversion module. Square waves are generated through the FPGA module, the signal frequency is convenient to adjust, a high-speed laser driver is used as a main component to generate broadband pulses, pulses of dozens of picoseconds or even several picoseconds can be generated, and a method of a high-frequency cable and a transmission line to be detected is adopted, so that fault positioning can be accurately carried out.

The invention discloses a field detection method for coil equipment in a low-temperature environment, belongs to the technical field of state monitoring and fault diagnosis of power equipment, and aims to solve the problems that a traditional detection method fails and is high in misjudgment rate, field instruments are difficult to work stably and the like due to nonlinear change of material characteristics of the coil equipment under an extremely low-temperature condition. The method comprises the following steps: injecting broadband pulse excitation into coil type equipment at the environment temperature of DEG C, and synchronously acquiring instantaneous voltage, instantaneous current and surface temperature of a coil; and calculating two characteristics of thermal disturbance energy quantum and low-temperature self-healing impedance according to the collected data, fusing the two characteristics to generate a thermal disturbance temperature fingerprint dimensionless characteristic, comparing the thermal disturbance energy quantum and low-temperature self-healing impedance dimensionless characteristic with upper and lower threshold values of a low-temperature golden interval of similar equipment, and judging whether the coil equipment has turn-to-turn short circuit or a joint abnormal high thermal resistance fault or not.

The present application relates to the technical field of cable fault, and more particularly to a method and system for precise positioning of medium and high voltage cable fault based on broadband pulse reflection, wherein the method comprises: exciting a medium and high voltage cable with a spread spectrum signal to obtain a full reflection signal sequence; analyzing the traveling wave characteristics of the full reflection signal sequence to obtain cable joint position calibration information and a suspected fault time section; injecting a traveling wave signal into the suspected fault time section to collect a corresponding single reflection waveform sequence; analyzing the single reflection waveform sequence fault arc electromagnetic fingerprint, performing feature correlation identification with a preset fault discharge feature table, and determining the fault discharge mechanism type; evaluating the traveling wave time delay of the suspected fault time section according to the single reflection waveform traveling wave arrival time and the cable wave speed parameter, and calculating the accurate distance of the fault point; and fusing and packaging the accurate distance of the fault point and the fault discharge mechanism type to generate cable fault joint diagnosis information.

This invention provides a method for locating elevator ride quality defects, belonging to the field of elevator quality technology. The invention collects vibration and acoustic emission signals by arranging triaxial accelerometers and acoustic emission sensors in the elevator shaft. Feature vectors are extracted using wavelet packet energy spectrum compression and uploaded to the cloud. Broadband pulse excitation is applied to the traction rope end, and a broken wire distribution map is output through traveling wave reflection tomography. The vibration signal is enhanced by bistable random resonance and the impact repetition period is extracted using kurtosis spectrum adaptive frequency band selection. Finally, the broken wire distribution map, impact repetition period, fault source spatial coordinates, and fault type label are fused to generate a ride quality defect location report. This solves the technical problem of not being able to achieve fault feature extraction and accurate spatial location within a unified framework for multi-source heterogeneous signals.

This invention provides a laser pulse waveform control system based on incoherent combining and tunable beam splitting, mainly composed of a broadband pulse seed source, a first module, a second module, and a reflective fiber grating. The pulsed laser signal output from the broadband pulse seed source is first amplified by the first module, and then split into two beams by a tunable beam splitter: one beam is reflected by the first module and the reflective fiber grating to the third port of a circulator for subsequent amplification; the other beam enters the second module for pulse delay and gain amplification, and then is reinjected into the first module through a loop to achieve secondary amplification and cyclic beam splitting. The system relies on the reflective fiber grating and the loop optical path to delay, amplify, and combine time-domain pulses, outputting a tunable laser signal at the third port of the circulator. This scheme is a highly stable, all-fiber integrated pulse time-domain shaping method compatible with MOPA systems, which can effectively improve the processing adaptability and application range of laser processing systems.

The invention relates to the technical field of signal compression, in particular to an ultra-wideband pulse waveform space-time synchronous compression method and system, a medium and a product. The method comprises the following steps: executing multi-dimensional orthogonal projection on an original ultra-wideband pulse signal by using a spatio-temporal joint perception dictionary to extract a spatio-temporal characteristic coefficient; adjusting an observation matrix according to the channel state information, and performing compressed sampling on the spatial-temporal characteristic coefficient by using the adjusted observation matrix to generate a compressed observation vector; performing manifold learning dimensionality reduction mapping on the compressed observation vector to construct a space-time manifold topological structure, and obtaining manifold feature coordinates based on the space-time manifold topological structure; introducing weighted least square constraint to carry out nonlinear reconstruction on the flow shape characteristic coordinates to generate a sparse pulse sequence; and performing variational Bayesian iterative reasoning on the sparse pulse sequence to obtain an optimal quantization parameter, and performing entropy coding on the sparse pulse sequence by using the optimal quantization parameter to generate a transmission code stream. The method can guarantee that the details of the pulse signals are complete and distortionless.

An optical system for transmitting a beam of light through a variably refractive medium includes an optical source configured to generate a first beam of light, a modulator system, and an amplifier. The modulator system includes a driver configured to generate a driver signal and at least one modulator. The at least one modulator is configured to receive the driver signal and the first beam of light, and time slice and encode data on the first beam of light to generate a second beam of light. An optical spectrum of the first beam of light is matched to a wavelength range of the at least one modulator. The amplifier is configured to amplify the second beam of light to generate a third beam of light. The optical system transmits the third beam of light through a variably refractive medium.

A light source apparatus generates wavelength scanning light. A pulsed light source generates pulsed light including a continuous spectrum. An optical divider spatially divides the broadband pulsed light L into a plurality of n (n≥2) beams according to wavelengths. A plurality of n fibers give different delays to the n beams. The coupler multiplexes n beams output from the n fibers. In the light source apparatus, at least a part from an incident end of the optical divider to emission ends of the n fibers has a continuous waveguide structure. A light monitoring device extracts and measures part of light propagating through the continuous waveguide structure.

Molecular rotational resonance (MRR) spectroscopy is a structurally specific, high-resolution spectroscopic technique capable of identifying chemical species, including enantiomers, that cannot be resolved by other analytical techniques. In MRR spectroscopy, a gas-phase sample is injected into a vacuum chamber, where it is excited with millimeter-wave or microwave radiation and emits a free induction pulse (FID) in response. The spectrum of the FID pulse provides information about the sample's chemical structure. In MRR ratio measurements, the sample is simultaneously illuminated by two excitation pulses at different frequencies (e.g., a broadband pulse and a narrowband pulse at different frequencies, or a narrowband pulse at different frequencies). The pulses stimulate simultaneous or overlapping FID emissions from different components of the sample. Comparing the spectra of these FID emissions yields the ratio of the components in the sample.

Active auscultation may be used to determine characteristics of an organ (e.g., lungs or heart) of a user.SOLUTION: Acoustic or piezoelectric signals (e.g., pulses, tones, and / or broadband pulses) are projected into the body or thorax of an animal (typically a human). The signal may interact with the body or the lungs, possibly causing resonance in the body / lungs. The resulting signal is emitted from the body and can be analyzed to determine, for example, the resonant frequency or resonant frequencies of the lungs, and / or how the sound is otherwise absorbed, reflected, or altered by the body. This information may indicate characteristics of the lungs, such as lung capacity, the volume of air trapped in the lungs, and / or the presence of COPD.SELECTED DRAWING: Figure 1

This invention discloses a direction finding method for a large-aperture array supported by acquired information. The method includes the following steps: Step 1: Acquire dual-channel data to be processed and acquired information; Step 2: Perform signal preprocessing and Fourier transform; Step 3: Determine the signal type; if it is a narrowband pulse signal, proceed to Step 4; if it is a wideband pulse signal, proceed to Step 6; Step 4: Extract the envelopes of the two narrowband pulse signals; Step 5: Estimate the arrival time of the two pulse signals and calculate the time delay difference; Step 6: Calculate the cross-correlation spectrum of the two wideband pulse signals; Step 7: Search for the peak value of the cross-correlation spectrum and calculate the time delay difference; Step 8: Calculate the direction of arrival of the signal and output the direction finding result. This method is applicable to large-aperture dual-element arrays, uses acquired information as support, and realizes a direction finding method that matches the signal type. It has strong engineering practicality and is suitable for real-time signal processing.

An on-line measuring device and method for high-energy broadband pulsed laser field and far-field focal spot: the broadband pulsed laser generated by a high-energy laser is first processed by an intensity attenuation system, and then reaches a beam splitting element; the light beam transmitted through the beam splitter passes through a coding plate, which codes and modulates the light beam, and then a single-frame diffraction image intensity formed after the coding plate modulation is recorded by a surface array light intensity detector; the light beam reflected by the beam splitting element is recorded by a spectral analysis unit. With the single-frame diffraction image intensity recorded by the surface array light intensity detector and the single-spectrum data recorded by the spectral analysis unit, the near-field complex amplitude (intensity and phase) distribution of the high-energy broadband pulsed laser field to be measured can be accurately reconstructed through a multi-modal light field reconstruction algorithm, and the far-field focal spot distribution can also be obtained. The method has the advantages of simple structure, low cost and strong environmental anti-interference ability.

A packet data protocol unit (PDPU) transmission method includes: a communication apparatus generates and sends a PPDU, where the PPDU includes a first segment and a second segment. Transmission frequency bands of the two segments are different, and an inactive segment exists between the two segments. The communication apparatus does not transmit an ultra-wideband (UWB) pulse within a duration of the inactive segment.