307 results about "Reference wave" patented technology

The invention discloses a high-precision methane infrared spectrogram intelligent detection method and system, and relates to the field of infrared spectrum determination.The method comprises the steps that multi-wavelength signals of a target detection area are collected, the change process of the multi-wavelength signals is continuously monitored, a change sequence of the wavelength signals is obtained, the change sequence is analyzed, and a methane infrared spectrogram is obtained. Obtaining a first time sequence characteristic of the main absorption wavelength signal relative to the first reference wavelength signal and a second time sequence characteristic of the main absorption wavelength signal relative to the second reference wavelength signal, and determining a judgment threshold according to real-time change states of the first reference wavelength signal and the second reference wavelength signal; and when the change of the main absorption wavelength signal is detected to be earlier than the change of any reference wavelength signal and the change amplitude of the main absorption wavelength signal is greater than a judgment threshold value, calculating the methane concentration value according to the change time difference and the change amplitude ratio of the main absorption wavelength signal and the reference wavelength signal. By implementing the method, the response time of methane leakage identification can be reduced.

The invention relates to the technical field of data processing, and discloses a digital feedback dynamic adjustment method and system for a neutron generator control signal, and the method comprises the steps: calling a reconfigurable waveform parameter set corresponding to a target neutron from a mapping relation according to the yield and beam spot characteristic demands of the target neutron; generating a basic high-frequency pulse sequence of the neutron tube, and performing pre-distortion filtering on the basic high-frequency pulse sequence to obtain a high-frequency pulse sequence of the neutron tube; collecting an anode current and a target voltage signal of the neutron tube applied with the high-frequency pulse sequence during operation, and converting the anode current and the target voltage signal into a digital feedback current; comparing the digital feedback flow with a reference waveform in the reconfigurable waveform parameter set in real time to obtain an error correction amount of the high-frequency pulse sequence; dynamically adjusting the high-frequency pulse sequence according to the error correction; applying the dynamically adjusted high-frequency pulse sequence to a corresponding electrode in a neutron tube through power; the neutron tube control signal processing efficiency can be improved.

The invention relates to the technical field of converter control, in particular to a novel four-level efficient grid-connected system and a control method, and the method comprises the steps: determining the target output power, the target input power, the actual output power and the actual input power of a converter based on a 4L-HCC converter; determining a phase angle and an output voltage amplitude based on a preset virtual synchronous machine control strategy, and converting to obtain a corresponding three-phase reference voltage; performing HCC internal capacitor voltage control on the converter, establishing a corresponding loss function, and determining a reference wave change range corresponding to each switching device on the converter based on actual setting; the corresponding reference wave signal with the minimum loss function derivative is calculated; and carrying out phase shift pulse width modulation on the converter, taking high-frequency triangular waves with different phases as carriers, comparing the calculated reference wave signals with the carriers, calculating the duty ratio of each switching device of the converter and a switch driving signal, and driving each switching device of the converter.

The invention provides an isolating switch performance monitoring system, which comprises a data acquisition module which at least comprises a current sensor and a signal conditioning circuit and is used for acquiring action current signals of a driving motor in an isolating switch in real time; the data processing module is used for performing filtering, noise reduction and time domain and frequency domain feature extraction on the received action current signal of the driving motor and establishing a corresponding waveform database according to the extracted features, and the waveform database at least comprises a normal waveform database and an abnormal waveform database; and the state evaluation module is used for comparing the real-time waveform with the reference waveform in the waveform database through a preset algorithm, identifying abnormal feature points existing in the real-time waveform and generating a corresponding performance evaluation result. Precise evaluation of the performance of the isolating switch is realized based on the current waveform of the driving motor.

The invention relates to an anemia blood transfusion risk management system based on real-time monitoring, and belongs to the technical field of medical data processing. The management system comprises a plurality of sensors and is used for acquiring multiple monitoring data such as hemoglobin concentration, blood oxygen saturation waveform and cardiovascular waveform of a patient, and real-time analysis is executed by a calculation module. The calculation module quantifies key indexes such as blood volume change and hemoglobin concentration by constructing a dynamic risk index model, and performs morphological similarity comparison on a real-time waveform and a plurality of established reference waveform templates. And the management system corrects the risk level based on the similarity analysis result and outputs a comprehensive score. The score can be used as a reference standard for clinical blood transfusion intervention.

The invention discloses an intelligent distribution network nuclear phase method and system based on GPS clock synchronization, and relates to the field of power system distribution network operation and maintenance. The intelligent distribution network nuclear phase method and system based on GPS clock synchronization comprise a nuclear phase source reference unit, a non-contact nuclear phase terminal and a cloud server system. According to the intelligent distribution network nuclear phase method and system based on GPS clock synchronization, three-phase voltage waveforms are continuously collected through a nuclear phase source reference unit, and reference waves are formed through GPS clock synchronization, time label adding and cloud real-time synchronization; a non-contact phase checking terminal is used for collecting three-phase voltage waveforms of a measuring end, GPS clock synchronization, time label adding and data packaging are carried out and uploaded to a cloud end, then a cloud server system is used for intercepting the voltage waveforms of the same time period through a GPS clock to carry out phase checking and phase difference analysis, and then feedback signals are generated according to the analysis result and a phase difference threshold value. The single-person non-contact operation is realized, the safety is high, the precision is high, and the nuclear phase structure can be stored.

The invention relates to the technical field of stress testing, in particular to a VCSEL epitaxial wafer stress distribution monitoring method and system. The method comprises the following steps: acquiring a PL spectrum of each measurement point and a peak wavelength of the PL spectrum, and decomposing the PL spectrum into polarization components along a first crystal orientation and a second crystal orientation; obtaining the initial polarization orthogonality of the measurement point based on the peak intensity of the polarization component; obtaining a reference wavelength of the VCSEL epitaxial wafer, and calculating a thermally induced wavelength drift factor of a measurement point; based on the thermally induced wavelength drift factor and a set maximum saturation value, thermally induced polarization artifacts of the measurement points are calculated, the thermally induced polarization artifacts are in positive correlation with the thermally induced wavelength drift factor, and the maximum saturation value is taken as an upper limit; subtracting the thermally induced polarization artifact from the initial polarization orthogonality to obtain a pure stress index; the pure stress indexes are mapped to the corresponding coordinates, the stress distribution diagram of the VCSEL epitaxial wafer is obtained, and the accuracy of the stress distribution monitoring result of the VCSEL epitaxial wafer is effectively improved.

The invention relates to a measuring arrangement for the interferometric determination of the surface shape of a test object, wherein a test wave generated from electromagnetic radiation and reflected at the test object can be superimposed with a reference wave not reflected at the test object, with a reference element (110, 210, 310, 410) having a reference surface (112, 212, 312, 412) which, in the optical beam path, splits off the reference wave from the test wave before it strikes the test object (120, 220, 320, 420) by reflection, and at least one beam shaping surface (111, 211, 311, 411, 413, 414) located in the optical beam path in front of the reference surface, wherein this beam shaping surface is designed as an aspherical distortion correction surface such that a distortion occurring in a predetermined reference plane of the measuring arrangement is reduced. The invention further relates to a method for manufacturing an optical element for such a measuring arrangement.

A method of controlling a reconfigurable intelligent surface (RIS) is provided for multi-target spot beamforming at a plurality of target beam focus positions. The RIS includes a 2D array of unit cells, each unit cell being controllable to be at any selected one of a plurality of wave propagation path states for providing a corresponding degree of phase shift for an incident electromagnetic wave irradiated thereon. The method includes: for each of the plurality of target beam focus positions: determining, for each unit cell of the plurality of the 2D array of unit cells, an interference pattern at the unit cell between a reference wave from a multi-mode orbital angular momentum (OAM) signal transmitter to the unit cell and an object wave from the target beam focus position to the unit cell, the multi-mode OAM signal transmitter being configured to generate and transmit a multi-mode OAM signal to irradiate the RIS at a surface thereof; and for each unit cell of the plurality of the 2D array of unit cells: determining a holograph pattern based on the interference patterns determined at the unit cell for the plurality of target beam focus positions; determining a degree of phase shift for the unit cell to provide based on the holograph pattern determined for the unit cell; and controlling the unit cell to be at a selected one of the plurality of wave propagation path states corresponding to the degree of phase shift determined for the unit cell to provide. There is also provided a corresponding RIS controller and a corresponding multi-target spot beamforming system.

A semiconductor driving device according to the present disclosure includes: a timing generation unit which generates gate ON reference signals respectively for a plurality of gate terminals; a gate reference waveform generation unit which generates a first gate reference waveform and a second gate reference waveform on the basis of the gate ON reference signals, and controls the first gate reference waveform and the second gate reference waveform in shifting from a non-conductive state to a conductive state of a multi-gate semiconductor switching element and shifting from a conductive state to a non-conductive state of the multi-gate semiconductor switching element; and a signal amplification unit which receives, as an input waveform, the first gate reference waveform and the second gate reference waveform, and amplifies the input waveform so that an output waveform follows the input waveform.

Provided are a method for operating a device in a wireless communication system, and a device using the method. The method comprises: measuring a plurality of reference beams; selecting at least one beam from among the plurality of reference beams; and communicating with a base station using the at least one selected beam, wherein the plurality of reference beams are beams transmitted according to a first scheme or a second scheme. In the first scheme, N (N is a natural number greater than or equal to two) reference beams are transmitted at a first transmission time, and an offset is applied to the N reference beams at a second transmission time. In the second scheme, 2N reference beams are transmitted, wherein a second frequency interval between adjacent beams of the 2N reference beams is half a first frequency interval between adjacent beams of the N reference beams.

The invention discloses a conventional direct current line single-ended protection method and system based on dynamic time curling, and the method comprises the steps: 1, obtaining the positive and negative electrode voltages of a direct current transmission line, calculating the line mode voltage and the wavelet transformation modulus maximum value of the line mode voltage, and entering a step 2 when the maximum value meets a protection starting criterion; step 2, calculating the maximum value of the absolute value of the voltage change rate of the positive and negative voltage fault components in a preset time window, if the absolute value is greater than a short-distance fault auxiliary criterion threshold, entering step 5, otherwise, entering step 3; 3, calculating a line mode voltage fault component time sequence; 4, calculating a dynamic time curl distance characteristic quantity between the normalized line mode voltage fault component time sequence and the reference waveform time sequence, when the dynamic time curl distance characteristic quantity is smaller than or equal to a fault section identification judgment threshold value, entering the step 5, and otherwise, returning to the step 1; and 5, judging a fault type and a line, and determining a restart control scheme. According to the invention, the problem that the traveling wave protection far-end high-resistance fault is easy to reject operation is solved.

The invention relates to an interferometric testing arrangement for testing the surface shape of a test object, comprising a lighting device (105, 205, 305) for generating an input wave from electromagnetic radiation produced by a light source and an interferometer (150) in which, after splitting the input wave into at least one test wave directed towards the test object (170) and a reference wave, testing the surface shape of at least a partial surface of the test object (170) can be carried out by interferometric superposition of the at least one test wave and the reference wave, wherein a diffuser (130, 230, 330) is arranged in the lighting device, wherein the lighting device has a first optical path (110, 210, 310) and a separate second optical path (120, 220, 320), and wherein the input wave is transmitted via both the first optical path (110, 210, 310) and the second optical path (120, 220, 320). 220,320) can be coupled into the interferometer (150).

The embodiment of the invention provides a wave surface information extraction method and device, electronic equipment and a storage medium, and belongs to the technical field of wave measurement. The method comprises the following steps: acquiring a liquid level image and a wave surface image, performing liquid level identification on the liquid level image to obtain a liquid level curve coordinate, and calculating reference wave height data of a liquid level curve; and performing identification to obtain original wave surface point cloud coordinates of the wave surface image, and performing coordinate system conversion on the plurality of original wave surface point cloud coordinates according to the conversion matrix to obtain a plurality of basic wave surface point cloud coordinates. And performing data calculation according to the target point cloud coordinate, the reference point cloud coordinate and the reference wave height data to obtain target wave height data corresponding to the target detection point, and generating wave surface information of the target detection point based on the target wave height data. According to the embodiment of the invention, the wave surface information acquisition efficiency can be improved, and the cost is reduced.

The invention provides a dynamic gesture recognition method and device, electronic equipment, a chip and a medium, and relates to the technical field of man-machine interaction. The method comprises the following steps: carrying out key point identification on an image in a video frame collected by a binocular camera, and respectively determining a first three-dimensional key point and a second three-dimensional key point; identifying the gesture category of the target gesture in the video frame as a first gesture category by using a dynamic gesture classification model; based on the corresponding relation between the reference waveform feature and the gesture category, using a signal recognition algorithm to analyze the waveform feature formed by the first stereo key point and / or the second stereo key point, and recognizing a second gesture category corresponding to the target gesture in the video frame; and checking whether the first gesture category is consistent with the second gesture category to determine a target gesture category. Through the technical scheme provided by the invention, the problems of low accuracy and low stability of dynamic gesture recognition are solved, the accuracy and the stability of gesture recognition are improved, and the user experience of gesture interaction is improved.

The invention discloses a free-form surface imaging aberration propagation calculation and aberration control method. According to the method, on the basis of a given system light path, an object plane, an image plane, an entrance pupil and an exit pupil of each optical curved surface are calculated, and reference wave surfaces of a central view field at the entrance pupil and the exit pupil are calculated. A group of characteristic light is generated by an entrance pupil and a field of view of the sampling system, the optical path difference of the characteristic light of each field of view propagating from the entrance pupil of each curved surface to the exit pupil relative to the main light is calculated, and the aberration field of each curved surface is obtained by fitting the optical path difference of the full field of view; determining the contribution of each curved surface to the dominant aberration according to the dominant aberration of the current system and the aberration field of each curved surface, thereby determining the curved surface which is optimized first; the aberration is reduced by optimizing the curved surface parameters, corresponding to the current dominant aberration, of the curved surface, and the process is repeated until the design meets the requirements. The method can effectively guide the optimization of the free-form surface imaging system, reduces the deviation degree of the free-form surface while guaranteeing the imaging performance, and effectively reduces the processing and detection difficulty of the surface.

The invention relates to a method for interferometric surface measurement of a test specimen, a computer-generated hologram (CGH) and an interferometric test arrangement. In a method according to the invention, an interferometric superposition of a test wave directed by a CGH (120, 220, 320, 410, 420, 430, 510) onto the test piece (140, 240, 340, 540) and reflected therefrom is carried out with a reference wave not reflected at the test piece, wherein, based on a further interferometric superposition of light reflected at at least one Littrow structure (122, 222, 322, 412, 422, 432, 512) of the CGH with light reflected at a reference surface, a contribution to the optical effect of the CGH caused by a deformation present at the CGH is determined, and wherein a determination of the fit of the test piece (140, 240, 340, 540) is carried out taking this contribution into account.

To provide a technique capable of quickly correcting discharge characteristics while reducing an environmental load.SOLUTION: A regression model construction unit 919 constructs a regression model Y, by utilizing machine learning that uses training data which uses as input a feature difference dF, which is a difference between a reference feature F0 of a reference waveform Wst measured with a reference parameter P0 and the peripheral feature F1 to Fm of the peripheral waveforms W1 to Wm measured with peripheral parameters P1 to Pm obtained by changing some of the values of the reference parameter P0, and which uses as output the parameter difference dP, which is the difference between the reference parameter P0 and the peripheral parameters P1 to Pm. A correction unit 917 inputs a feature difference F0'-F0, which is the difference between the reference feature F0 of the reference waveform Wst and a target feature F0' of a target waveform Wst' measured with the reference parameter P0 after the reference waveform Wst was measured, into the regression model Y, and corrects the reference parameter P0 according to the correction amount output from the regression model Y.SELECTED DRAWING: Figure 10

The invention provides an antenna and a method for generating an orbital angular momentum beam. The antenna adopts a holographic metasurface antenna integrating a monopole feed source and a metasurface unit network, and the monopole feed source is a coaxial feed monopole located in the center of a lower metal plate and is used for generating reference waves. Vortex beams propagating in the normal direction of an antenna serve as target waves, a hologram function is calculated in combination with reference waves, and then surface phase distribution is obtained. And modulating a gap state of the metasurface unit network by using the phase distribution to provide required phase compensation, so that the modulated unit interacts with a reference wave, and finally generating an orbital angular momentum wave beam in a specified mode. The monopole feed source and the metasurface are integrated through the holographic principle, a complex feed network and an external emission source are omitted, the antenna has the advantages of being simple in structure, low in profile, easy to miniaturize and integrate and the like, and the problems that in the prior art, occupied space is large, and design is complex are effectively solved.

The present disclosure provides a holographic antenna, a beam control method thereof, a storage medium and an electronic device, and belongs to the technical field of antennas. The present disclosure can solve the problem that the existing antenna structure is complex and the polarization direction is not variable. The holographic antenna comprises a dielectric substrate, a radiation layer and a plurality of switch units. The radiation layer is provided with a plurality of slit openings. The switch units are arranged correspondingly to the slit openings. The holographic antenna further comprises an acquisition unit configured to acquire a target wave and a polarity of the target wave; a construction unit configured to construct a reference wave based on the polarity of the target wave; a calculation unit configured to calculate an interference wave based on the reference wave and the target wave; a sampling unit configured to obtain an excitation sampling value of each slit opening; and a control unit configured to control the switch units to control the switching state of the slit openings. The present disclosure can realize dynamic reconfiguration of different polarizations by using the holographic principle combined with a slot antenna.

An antenna system includes: a first antenna configured to beam steer electronically to first beams each with a beamwidth that is larger than a reference beamwidth; a second antenna configured to implement a second beam with a beamwidth that is smaller than the reference beamwidth; a gimbal; a gimbal driver; and a controller configured to: cause the first antenna to beam steer electronically to the first beams for a first mode of the antenna system; determine a preferred beam, of the first beams, based on a signal received by the first antenna via the preferred beam; and cause the gimbal driver to move the gimbal to mechanically steer the second antenna to at least one direction corresponding to the preferred beam for a second mode of the antenna system.

The invention provides an extended target phase offset coherent waveform design and efficient accumulation method. The method comprises the following steps: acquiring a pulse signal of a JFPA waveform received by a target, returning echo signals of a plurality of extended targets, and searching a target coarse velocity by using a minimum envelope entropy, constructing a matching function to perform motion compensation on the echo signal to obtain a two-dimensional time domain signal; taking the jitter initial phase of the echo signal corresponding to the reference waveform as a matched filter, and compensating the jitter initial phase of the echo signal corresponding to the coherent accumulation waveform; and designing the echo signal after initial compensation as a coherent echo signal, and performing Fourier transform on the coherent echo signal along slow time to obtain a coherent accumulation result of the target. According to the method, accurate initial phase jitter compensation is completed without target distance information, the method is suitable for an extended target, and after the echo signal of the JFPA waveform is subjected to initial phase jitter compensation, the phase is controlled to be uniform, so that the complexity of FFT coherent processing can be reduced.

The application provides a synchronous accelerator multi-harmonic beam trajectory reconstruction method and system, and relates to the technical field of accelerators. The method comprises the following steps: obtaining an accelerating cavity high-frequency signal of the synchronous accelerator, so as to generate a frequency-synchronized reference waveform according to the accelerating cavity high-frequency signal; setting a phase trigger window based on the reference waveform, so as to control the synchronous acquisition of beam signals of a full ring of the synchronous accelerator by a beam diagnosis device of the full ring; performing time domain analysis on the beam signals to obtain an effective beam signal interval, so as to calculate position data of the beam signals based on the effective beam signal interval; and reconstructing the motion trajectory of the beam according to the position data of the beam signals, which can accurately identify and associate the data of the same beam in the multi-harmonic acceleration process.

To provide a calibration apparatus for spectrometers that enables measurement reproducibility among different spectrometers, an article inspection apparatus with the calibration apparatus, and a calibration method for spectrometers.SOLUTION: A calibration apparatus for spectrometers that measures the intensity of incident light for each wavelength, includes: a light source part that irradiates a spectrometer B, which is the calibration target, with light having a known spectrum; a storage part that stores a reference wavelength conversion formula FA defining a relation between each sensor and wavelength when a spectrometer A, serving as the reference, is irradiated with light having a known spectrum from the light source part; a calculation part that calculates a wavelength conversion formula FB for the calibration target by irradiating the spectrometer B with light having a known spectrum from the light source part and defining a relation between each sensor and wavelength; and a calibration part that determines a difference between the stored wavelength conversion formula FA and the wavelength conversion formula FB, and calibrates the spectrometer B by adding the difference as a correction coefficient Cλ to the wavelength conversion formula FB.SELECTED DRAWING: Figure 4

According to one aspect of the present invention, a light-emitting device may be provided, the device comprising: a substrate; a light-emitting element disposed on the substrate to generate light; and a light-absorbing filler configured to absorb the light such that, when a calculated spectrum is derived on the basis of a preset function and a spectrum of the light generated from the light-emitting element, the area of a predetermined reference wavelength band in the calculated spectrum does not exceed a threshold value, relative to the area of the entire wavelength band of the calculated spectrum.

An integrated photonic circuit has a semiconductor tunable laser with two tuning elements and an output port providing a first laser output, and a calibration structure The calibration structure has a first reference element having a first reference wavelength response (a primary peak or valley at a first reference wavelength) as the semiconductor tunable laser is tuned by adjusting at least one of the tuning elements. The calibration structure also has a first photodetector. At least part of the laser output from the output port is coupled to the calibration structure. At least part of the first laser output is coupled within the calibration structure to the first reference element; and at least part of the first laser output leaving the first reference element after being coupled thereto is coupled to the first photodetector.

This application provides a signal conversion module, a control device, a motor control circuit, a system, and a vehicle. The signal conversion module includes a switching circuit, a charging circuit, an energy storage circuit, and a discharging circuit. The switching circuit and the charging circuit are connected in series between the module's input and output terminals. The first terminal of the energy storage circuit is connected to the connection node between the charging circuit and the module's output terminal, and the second terminal of the energy storage circuit is grounded. The first terminal of the discharging circuit is connected to the first terminal of the energy storage circuit, and the second terminal of the discharging circuit is grounded. When the switching circuit receives a step control signal, the signal conversion module outputs a voltage ramp signal, which, together with a reference waveform signal, forms a pulse width modulation (PWM) signal. Using a signal conversion module to replace the microcontroller's output PWM signal effectively reduces costs, eliminates the constraints of control software, and reduces risk.

The invention provides a terahertz signal aliasing elimination method and system based on deconvolution, and relates to the technical field of detection, and the method comprises the steps: collecting time domain waveforms of a reference region and a detection region, and obtaining geometric and material parameters; calculating a point spread function based on the reference waveform and geometric prior; calculating a time axis standardization mapping function based on geometric prior, and carrying out standardization processing on the observation waveform; performing deconvolution processing on the normalized time axis to obtain a restored pulse train; and generating a flight time chart based on the recovered pulse train, and executing curvature correction in combination with geometric priori to obtain a defect distribution diagram. According to the method, by introducing reference region prior and time standardization, point spread function drift caused by curvature and refractive index gradual change is effectively overcome, noise amplification in a high-absorption medium is inhibited, signal aliasing can be stably removed in a polyethylene hot melting joint scene, and accurate defect positioning can be achieved.

The invention discloses a rapid inversion method based on a radar electromagnetic model in a high-cold and high-altitude geological environment, and the core idea of the method is that a two-parameter wave field forward modeling model is constructed based on a Maxwell electromagnetic field equation, a time window-based convolution type objective function is utilized, and a real source function is not needed. Source-independent full-waveform inversion of single-offset GPR data is realized, an SVD method is introduced to automatically extract a reference waveform and determine the length of a time window, direct wave and reflected wave information is effectively separated, and the inversion calculation overhead is remarkably reduced in cooperation with a multi-scale frequency and random sub-source sampling strategy. According to the method, high-precision reconstruction can be performed on the underground dielectric constant and the conductivity on the premise that accurate source waveforms are not needed, and the practicability and the real-time performance of plateau area non-contact radar detection are remarkably improved.

An optical comb light source outputs an optical comb having a plurality of modes. The optical comb light source includes an optical comb generating section, an optical frequency changing section, and a mode optical frequency controlling section. The optical comb generating section generates the optical comb. The optical frequency changing section receives a reference wavelength light having a predetermined optical frequency and changes the optical frequency of the reference wavelength light for output. The mode optical frequency controlling section controls a mode optical frequency that is an optical frequency of one mode of the plurality of modes such that a difference between the mode optical frequency and a target optical frequency that is an optical frequency of an output from the optical frequency changing section has a predetermined value. The optical comb generating section changes optical frequencies of the plurality of modes according to the controlled mode optical frequency.