210 results about "Pulse pair" patented technology

The invention discloses a detection method of a high-speed connector and a related device, and the method comprises the steps: carrying out the plugging motion control of the high-speed connector, injecting a pulse sequence carrying a displacement mark into a differential signal pair in the process, and obtaining the initial reflection data containing a plugging displacement-time index; space-time boundary information of a gap coupling section, an initial touch deformation section and a full-insertion steady-state section is analyzed and determined in a segmented mode through reflection characteristics. And generating a mutual excitation pulse pair in the initial touch deformation section, and executing differential sampling processing by using a thermal-electric coupling effect to obtain a thermally induced group delay sequence and a geometrically induced impedance differential sequence. A dynamic zero-reflection anchor point is generated based on double-sequence fusion, and real-time reference plane migration processing is realized to obtain a calibration impedance curve. And repeating the processes of insertion and extraction, generating an elastic difference curve through displacement-time coaxial difference processing of a bidirectional calibration impedance curve, and positioning an irreversible abnormal section of the impedance. According to the method, the plugging transient impedance change can be continuously monitored, and the early failure risk of the high-speed connector can be evaluated in time.

The invention discloses a live detection method for insulation defects of high-voltage power equipment. The method comprises the following steps: firstly, synchronously arranging ultrahigh frequency sensors and acoustic emission sensors on a plurality of monitoring points on the surface of a gas insulated switchgear shell to form an array, and synchronously acquiring signals for filtering pretreatment; then, pulse events are extracted from the two types of signals respectively, and associated pulses in a time window are matched into matched pulse pairs representing the same discharge source; then, carrying out time-frequency transformation on the ultrahigh frequency and acoustic emission pulse waveform in each matched pulse pair, carrying out joint noise reduction by calculating a coherence coefficient between time-frequency distribution matrixes, and extracting a joint feature vector containing an energy ratio, a time parameter ratio and a frequency difference from the denoised time-frequency matrix; according to the invention, multi-source signals are fused, and high-sensitivity detection, high-precision positioning and high-accuracy identification of insulation defects are realized.

The invention discloses a radio frequency voltage sensor and a plasma source system. The radio frequency voltage sensor comprises a signal acquisition module and a signal processing circuit. The signal processing circuit comprises a rectangular wave pulse detection module, a signal conversion module, a peak holding module and an operation output module; the input end of the rectangular wave pulse detection module receives a pulse synchronization signal; the signal conversion module is connected with the output end of the signal acquisition module; the first input end of the peak holding module is connected with the output end of the signal conversion module, and the second input end of the peak holding module is connected with the output end of the rectangular wave pulse detection module; and the operation output module is connected with the output end of the peak holding module. According to the radio frequency voltage sensor and the plasma source system provided by the invention, the peak voltage corresponding to the single-stage pulse can be accurately detected, the peak voltage corresponding to the multi-stage pulse can also be stably detected, the output is prevented from jumping to zero during the pulse closing period, and the stability and practicability of measurement are improved.

A method of operating a distance sensor includes emitting pulses of light from an emitter on the distance sensor at one or more designated wavelengths in a non-visible spectrum and receiving a set of reflected pulses of light with a receiver on the distance sensor that correspond to the pulses of light reflected off a surface of an object within a line-of-sight of the receiver. A point cloud is generated of an area including the surface of the object based on the set of reflected pulses of light. A pattern is identified on a surface of the object based on at least one of an area of increased or decreased reflectivity for the one or more designated wavelengths in the non-visible spectrum identified in the point cloud. Embedded data is decoded from the pattern on the surface of the object.

The present invention discloses a three-point auxiliary positioning method and device for invisible pulse laser processing focus. By setting a coaxial pinhole device and combining multiple image algorithms with translation stage feedback, real-time focus tracking is achieved, positioning accuracy is improved, and anti-interference ability is enhanced. There is no need for repeated calibration after the first calibration, which improves processing efficiency. The equilateral triangle structure is used to suppress single-point errors, and the processing defocus amount and whether the vertical processing requirements are met can be quickly determined. The overall cost is reduced and the operational safety is improved. The positioning of the pulse focus is mainly determined by the image acquisition algorithm, and its focus calibration is replaced by three visible light indicator lasers. There is no need to use expensive photoelectric detection equipment. In addition, the entire calibration process is mainly completed by a computer or other controller, avoiding the harm of invisible pulses to operators.

The invention belongs to the technical field of radio metering detection, and particularly discloses a time difference and angle measurement method and device for a microwave navigation landing system and a medium, and the method comprises the steps: responding to a received barker code, obtaining reference time, and carrying out the time synchronization; obtaining a scanning pulse according to the scanning interval and the back-scanning interval; analyzing and extracting the A / D sampling signal according to the scanning pulse to obtain a forward scanning beam and a backward scanning beam in the scanning pulse; obtaining a scanning time difference according to the forward scanning beam and the backward scanning beam; according to the scanned time difference, analysis is carried out based on non-constant clock counting, and a time difference signal is obtained; obtaining MLS angle data based on preset space angle position coding data according to the time difference signal; the invention aims to solve the problems of weak anti-interference acting force and low angle guiding precision of a microwave navigation landing system in the prior art.

The invention discloses an end-to-end radar working mode identification method based on hierarchical density clustering and an encoder, and the method comprises the steps: firstly obtaining the pulse repetition interval PRI, PW pulse width and carrier frequency RF data of a radar pulse, and constructing a radar pulse sequence; and meanwhile, recording an initial working mode label corresponding to each pulse. Secondly, inputting a radar pulse sequence for preprocessing to obtain a preprocessed radar pulse sequence; and finally, performing working mode identification on the preprocessed radar pulse sequence through an encoder structure neural network model, and outputting a working mode corresponding to the radar. According to the method, the input sequence quality is remarkably improved, data interference is reduced, and the recognition rate of a complex radar working mode is improved.

The invention provides a vehicle OTA upgrade method and upgrade system based on quantum encryption, relates to the technical field of vehicle OTA upgrade, and is applied to a server, and the server and a vehicle establish a quantum channel and a classical channel through an optical fiber interface integrated on a charging pile. The method comprises the following steps: in response to a received quantum state light pulse which is sent by a vehicle through a quantum channel and is coded with a random first basis vector, measuring the light pulse; comparing a second basis vector for measurement with the first basis vector in a classic channel, screening a matching result to obtain a first key, and determining the quantum bit error rate of the first key; if the quantum bit error rate is smaller than the bit error rate threshold, compressing the first key to obtain a second key; and encrypting an OTA upgrade package obtained from the main engine plant cloud platform based on the second key, sending the OTA upgrade package to the vehicle through the optical fiber interface, and decrypting the vehicle to complete upgrade. According to the method, the information leakage risk is effectively eliminated by utilizing quantum characteristics and combining quantum bit error rate judgment, compression processing and the like, so that the security of OTA upgrading is improved.

The invention discloses an SAR interference suppression method based on echo asynchronous pulse detection, and the method comprises the steps: constructing a local odd-even channel comparison mode or a global reference pulse comparison mode, directly carrying out the processing in a time domain of an SAR echo data matrix, determining a corresponding mode through the energy characteristics of an interference signal, and carrying out the detection of the interference signal. Constructing a channel difference mask and an outlier mask in the corresponding mode, and finally obtaining an interference mask in each mode; establishing a mask matrix based on the interference mask, and processing the amplitude matrix to obtain an amplitude matrix after interference suppression processing; and combining the phase matrix to obtain a final non-interference SAR echo data matrix. According to the method, interference artifacts brought to SAR image data by the forwarding type coherent interference can be suppressed, and the phenomenon of sidelobe deterioration of strong scattering points in the image after frequency domain notch is eliminated, so that the forwarding type coherent interference existing in the SAR echo data is effectively suppressed.

The invention relates to the technical field of non-electrical variable control or regulation systems, and discloses an exhaust gas aftertreatment flow channel back pressure dynamic regulation method, which comprises the following steps: acquiring a supply source phase reference signal and establishing cyclic mapping; a fluid channel pressure signal pulse range change rate is extracted to determine a feed-forward factor; determining a pressure signal trough interval as an action window; determining a reference amplitude based on the feedback deviation and using a feed-forward factor for compensation to determine a target adjustment instruction; the adjusting mechanism is driven to move in the action window, so that the response peak value is locked in the trough interval, the adjusting action is locked in the low-energy phase, kinetic energy intervention of fluid pulses on the adjusting mechanism is avoided, and mechanical abrasion is reduced; pulse characteristic feed-forward compensation is utilized to enable an adjusting instruction to sense the trend of a flow field, the response speed is increased while a signal is smoothed, and pressure balance under the transient working condition is maintained.

The present disclosure relates to a system and a method of performing Gaussian boson sampling via time multiplexing correlation of squeezed vacuum states for quantum information experiments. One embodiment relates to a method for performing Gaussian boson sampling comprising the steps of—generating a set of pulsed pairs of squeezed vacuum states,—performing time 2024 / 038212 multiplexed correlation of multiple of such pairs of squeezed vacuum states,—measuring, via a homodyne detection, a state from the pairs of generated squeezed vacuum states,—feed-forwarding the homodyne result of the measured states to a displacement unit,—performing displacement operations on the remaining state from the pairs of generated squeezed vacuum states, and—counting the states output from the displacement unit.

The invention provides a virtual synchronization mechanism network type control method, system and device based on flux linkage synchronization control and a medium, and the method comprises the steps: obtaining a three-phase AC voltage reference value based on the grid-connected point output data of a network type inverter through employing a virtual synchronization machine control strategy; based on the three-phase alternating current flux linkage measurement value, synchronous feedback correction is carried out on the three-phase alternating current voltage reference value, a PWM modulation input signal is obtained, and a trigger pulse is generated to carry out synchronous control on the network-forming inverter; according to the method, a virtual synchronous machine control strategy is combined with flux linkage synchronous control, and a three-phase alternating-current voltage reference value is subjected to synchronous feedback correction by utilizing a three-phase alternating-current flux linkage measurement value before PWM (Pulse-Width Modulation) modulation, so that synchronous control is performed on the grid-forming type inverter, the deceleration area of a transient power angle curve of the grid-forming type inverter can be increased, and the stability of the grid-forming type inverter is improved. Therefore, the limit clearing time of the grid-forming inverter is prolonged, and the transient stability and the large disturbance fault resistance of the grid-type inverter of the virtual synchronization mechanism are improved.

The invention discloses a frequency agility radar signal sorting and individual clustering method combining inter-pulse and intra-pulse characteristics. The method comprises the following steps: screening an original pulse stream to obtain a screened pulse stream; performing frequency domain filtering on the intermediate frequency data corresponding to each pulse after screening to obtain corresponding intermediate frequency filtering data, and performing down-conversion on the intermediate frequency filtering data of all the pulses after screening to the same frequency to obtain preprocessed intermediate frequency data of each pulse after screening; sorting all pulses corresponding to the preprocessed intermediate frequency data based on the pulse description word of each type of radar to obtain a cluster of the corresponding type of radar; based on an intra-pulse fingerprint feature extraction mode, extracting a fingerprint feature vector corresponding to each cluster after sorting; and clustering the fingerprint feature vectors based on an FCM clustering algorithm of a joint parameter optimization K value to obtain an individual clustering result of the radar of the corresponding model. According to the invention, more accurate radar individual clustering can be realized.

The invention discloses a grid exhaustion search cross-pulse pairing method based on correlation matching, and belongs to the technical field of radio signal positioning and detection. According to the method, aiming at the problems of large cross-pulse signal pairing calculation amount and low accuracy in a multi-aircraft cooperative positioning system, efficient and accurate cross-pulse pairing is realized by establishing a cross-pulse boundary model, a symbol matching constraint mechanism and a related matching verification mechanism. The method comprises: determining upper and lower bounds of a cross-pulse according to a geometrical relationship; correcting the search range by using symbol matching; solving a candidate target solution in the limited interval by adopting grid exhaustion search; and a unique effective solution is screened through time and geometry consistency verification. The method can effectively reduce the calculation complexity, improves the cross-pulse pairing precision and uniqueness, and is suitable for a passive positioning system in a multi-target, multi-base-station and low-signal-to-noise-ratio environment. Experiments prove that the pairing time can be shortened by about 50% while high positioning precision is kept, and the method has high engineering application value.

The application discloses a time synchronization method and system for quantum communication, wherein the method comprises the following steps: S100, performing second alignment on a transmitting end and a receiving end; S200, judging whether the synchronization optical pulses received by the transmitting end and the receiving end are a pair of synchronization optical pulses, and numbering the first pair of synchronization optical pulses found; S300, judging whether a subsequent optical pulse is missing according to the pulse timing property at the receiving end; S400, judging and numbering the quantum optical signals in the interval between the two synchronization optical pulses successively meeting the step S300 at the receiving end; and S500, repeating the steps S300 and S400 until the synchronization optical pulses and the quantum optical signals in one second are all judged and numbered. The application realizes high-precision time synchronization and adapts to higher frequency of quantum communication.

The invention discloses a radar communication integrated waveform design method based on an OFDM (Orthogonal Frequency Division Multiplexing) signal. The method comprises the following steps that: a transmitting end completes constellation mapping on transmitted communication information, performs ZCT matrix reconstruction, performs serial-parallel conversion on reconstructed communication data, performs spectrum shaping on an integrated signal by adopting an improved Nyquist pulse, and transmits the integrated signal to a receiving end; and then IFFT processing, parallel-to-serial conversion, cyclic prefix addition, digital-to-analog conversion and up-conversion are carried out on the shaped data, and finally integrated waveform emission is completed. And the receiving end performs down-conversion, analog-to-digital conversion and cyclic prefix removal operation on the received signal. In the communication function, serial-to-parallel conversion, FFT processing, inverse pulse shaping, parallel-to-serial conversion, ZC matrix reconstruction solution and inverse mapping are carried out on the data without the cyclic prefix to obtain communication information. In the radar detection function, radar signal processing is performed on data without cyclic prefixes. According to the method, the correlation of OFDM integrated signals can be effectively optimized, the modulation characteristic of communication information is improved, the influence of the communication information on a fuzzy function is reduced, OFDM symbols have better correlation, meanwhile, the peak-to-average power ratio of the system is effectively reduced through pulse shaping, implementation is easy, and the comprehensive performance of the system can be remarkably improved.

The invention discloses an aircraft composite material structure health monitoring system and method, and relates to the field of aircraft material health monitoring, and the system comprises a DAS integrated optical module which is used for generating and transmitting an optical pulse pair subjected to heterodyne phase modulation to a single-mode optical fiber sensing network, and converting backward Rayleigh scattering light into an electric signal; the single-mode optical fiber sensing network is arranged on the surface of the aircraft composite material structure and is used for converting an acoustic emission signal containing the physical change of the aircraft composite material structure into an optical phase change signal by utilizing a coherent Rayleigh scattering effect; the digital signal processing module is used for carrying out signal processing on the electric signal by utilizing a heterodyne phase modulation method based on instantaneous frequency tracking so as to identify and position the damage of the aircraft composite material structure; and the alarm output module is used for outputting a damage position, a damage degree grade and an alarm signal of the airplane composite material structure in real time when the structural damage is detected, so that full-distribution and wide-range online accurate monitoring is realized.

The invention discloses a radar signal sorting method based on an improved long short-term memory network, and the method comprises the steps: extracting a pulse arrival time sequence, namely, a TOA sequence, from a pulse description word stream of a radar receiver; discretization processing is conducted on the TOA sequence through a preset fixed time window width wunit, the TOA sequence is mapped into a binary vector, each time window corresponds to one position in the vector, if a pulse arrives in the window, the corresponding position is set to be 1, and otherwise, the corresponding position is set to be 0; an improved ILSTM neural network is constructed, the network adopts an encoder-decoder architecture, and an encoder is used for performing high-level feature extraction on an input binary sequence and outputting a context feature vector; the decoder performs sequence prediction or reconstruction by using the context feature vector so as to output a sorting result; training the improved LSTM neural network by using a binary TOA vector data set of a known radiation source label, and optimizing network parameters; and after processing the to-be-sorted interleaved pulse TOA sequence, inputting the to-be-sorted interleaved pulse TOA sequence into the trained ILSTM network, and outputting a radiation source sorting result corresponding to each pulse by the network. The method is suitable for radar signal sorting in high-density, complex-modulation and strong-interference environments.

The invention relates to a magnetic resonance system, a magnetic resonance imaging sequence and an optimization method. The imaging sequence comprises: a radio frequency excitation pulse; the first radio frequency refocusing pulse and the second radio frequency refocusing pulse are sequentially applied after the radio frequency excitation pulse; original gradient pulses including a right side original pulse applied between the center of the first radio frequency refocusing pulse and the center of the second radio frequency refocusing pulse and a left side original pulse applied at the center of the radio frequency excitation pulse and the center of the first radio frequency refocusing pulse, the right side original pulse being applied between the center of the first radio frequency refocusing pulse and the center of the second radio frequency refocusing pulse, and the left side original pulse being applied between the center of the first radio frequency refocusing pulse and the center of the second radio frequency refocusing pulse. The left side original pulse comprises a first gradient pulse corresponding to the radio frequency excitation pulse; and a first balance pulse, the first balance pulse being located in a first time period between an end point of the first gradient pulse and a start point of the first radio frequency refocusing pulse, and the first balance pulse including a positive pulse and a negative pulse located on the first gradient axis.

The present invention discloses a motion platform-based statistical histogram pulse pair defuzzification method, which primarily addresses the high computational complexity and low real-time performance issues of existing statistical histogram pulse pair defuzzification methods. The implementation scheme comprises the following steps: providing a primary motion platform and multiple auxiliary motion platforms, measuring the arrival time differences of received target pulses, and pairing them within a time difference window to form a time difference pair dataset; calculating a time difference boundary threshold based on the movement distance of the auxiliary motion platforms within the observation time; classifying the time difference pairs in the time difference pair dataset that meet the time difference boundary threshold using a statistical histogram method; setting a quantity threshold based on the number of target pulses, and using the quantity threshold to screen the classified results, selecting true time difference pairs and eliminating false time difference pairs, thereby completing pulse pair defuzzification. The present invention effectively reduces the system computational complexity and improves the system's real-time performance, and can be applied to aerospace and electronic warfare.

The application provides a brain-like synapse learning method and a brain-like technology neural morphological hardware system, and the method comprises the following steps: determining a pulse pair generated by a presynaptic neuron and a postsynaptic neuron in a brain-like synapse learning circuit, wherein the pulse pair comprises an input pulse generated by the presynaptic neuron and an output pulse generated by the postsynaptic neuron; determining an STDP mechanism corresponding to the pulse pair and a synapse weight corresponding to the STDP mechanism based on the pulse pair; and performing STDP learning corresponding to the brain-like synapse learning circuit based on the pulse pair and the synapse weight; wherein the STDP mechanism is a pulse time-dependent plasticity mechanism, and the front and rear pulses of the pulse pair correspond to a long-term potentiation process or a long-term depression process in the STDP mechanism according to the time sequence. The application realizes online learning of brain-like intelligence, and plays the environment self-adaptive characteristics of brain-like computing.

The technology, apparatuses, and systems disclosed herein include detecting a vertical synchronization (VSYNC) signal cycle; determining a high frequency trigger pulse based on detecting a pulse width modulation (PWM) signal of an illumination component, the high frequency trigger pulse corresponding to a deactivation time of the illumination component; receiving a delay time period; and activating a first sensor at a first time within the VSYNC signal cycle, the first time determined based on the high frequency trigger pulse and the delay time period. The first sensor can sense a first sensor reading, and can be deactivated after being activated. A display setting can be adjusted based at least on the first sensor reading, and the illumination component can be activated after the first sensor is deactivated.

The invention discloses an ocean laser radar waveform photonizing and post-pulse removing method. According to the method, single photon response calibration is completed by utilizing probability histogram distribution of single photon output integral values of a photomultiplier (PMT), and photonization processing of original echo waveforms acquired by the ocean laser radar is realized; and the post-pulse probability is calibrated to realize quantitative removal of the post-pulse. The experimental device comprises a signal generator, a laser, a digital adjustable attenuator, a photomultiplier (PMT), a data acquisition card and an upper computer processing module, and the stability of system triggering and data acquisition is ensured. According to the technical scheme, through single-photon calibration based on the integral value, continuous analog sampling and uniform representation of the photon number of discrete single-photon output waveform signals are completed, interference of post-pulse on weak signals of the ocean laser radar is eliminated, the measurement precision and reliability are improved, and the device has the advantages of being simple in structure, convenient to operate and accurate in calibration and has a wide application prospect. The method is suitable for the high-precision ocean laser radar detection field.

The invention discloses a signal sorting method and device based on multi-hypothesis tracking, and a storage medium, and relates to the technical field of radar signal processing. The method comprises the following steps: acquiring a pulse TOA sequence, and calculating a PRI candidate value set; searching an effective initial pulse pair in the TOA sequence, and creating an initial tracking hypothesis for the effective initial pulse pair; aiming at the initial tracking hypothesis, searching the next matched pulse; if the matched pulse is found, judging whether the currently used PRI value is consistent with the PRI value of the initial tracking hypothesis or not: if so, updating the initial tracking hypothesis; if not, creating a new branch hypothesis; fusing and pruning all tracking hypotheses at regular intervals; confirming the tracking hypothesis meeting the output condition as a sorted radar pulse sequence, and outputting the sorted pulse sequence and a corresponding PRI change mode sequence; and repeating the steps in sequence for the residual pulse sequence which is not sorted until the sorting ending condition is met. According to the invention, the reliability of PRI sorting is improved.

A method for generating image data from a pixel cell of an image sensor, including applying a pulse to a reset gate of the pixel cell, the pixel cell including a zeroth pixel and a first pixel; generating a signal from the pixel cell by sequentially applying a pulse to a zeroth transfer gate of the zeroth pixel and a first transfer gate of the first pixel, respectively; and refraining from applying a pulse to the reset gate of the pixel cell until each of the zeroth transfer gate and the first transfer gate has been applied a pulse; sampling the signal to obtain signals S0 and S1 and a reset signal RST; determining a merged signal as a difference between the signal S1 and the reset signal RST; determining a pixel signal PD0 output from the zeroth pixel as a difference between the signal S0 and the reset signal RST; and determining a pixel signal PD1 output from the first pixel as a difference between the signal S1 and the signal S0.

The invention provides a coherent optical time domain reflection sensing device and a method thereof, and relates to the technical field of distributed optical fiber acoustic wave detection. The device comprises a light source, a 1 * 2 coupler, a control and signal processing unit, an arbitrary waveform generator, a double-path parallel Mach-Zehnder electro-optical modulator, a reference arm optical fiber, an erbium-doped optical fiber amplifier, an optical filter, a circulator, a sensing optical fiber, a 90-degree optical mixer, a photoelectric detector and a data acquisition card. A detection light sequence containing positive and negative frequency shift light pulse sequences is injected into a sensing optical fiber, returned signal light which carries light phase information of each detection point and has superposed frequencies is mixed with local reference light, signal separation is achieved after the signal light is multiplied by complex factors corresponding to each frequency shift pulse and integration of a periodic integral multiple window is carried out, and the detection point light phase information is obtained. And optical phase information demodulation is carried out, and then fusion of detection results of optical signals of various frequencies is carried out, so that high-sampling-rate sensing of acoustic vibration is realized.

The invention discloses a carrier dual-beam squint synthetic aperture radar inversion ocean current antenna pointing correction method. The method specifically comprises the following steps: matching POS data with an SAR echo signal; taking the SAR echo signals corresponding to a plurality of continuous pulses as a data block, and storing corresponding POS data at the same time; a data block used for carrier dual-beam squint SAR radar antenna pointing correction is screened out; calculating the component of the total Doppler center frequency of the data block used for correction in the dual-beam radial direction, and calculating the component of the Doppler center frequency caused by the motion and attitude change of the carrier platform in the dual-beam radial direction; calculating the component of the Doppler center frequency of each data block for correction in the dual-beam radial direction after the carrier platform motion and attitude change are removed, converting the component into speed, performing vector synthesis, constructing a cost function, and solving the cost function; according to the method, the ocean current vector inversion quality is improved.

A temperature strain separable dynamic and static combined measurement distributed optical fiber sensing system, comprising: laser, optical modulator, radio frequency signal generator, optical filter, DFB laser, polarization controller, first acoustooptic modulator, depolarizer, erbium-doped fiber amplifier, two optical circulators, optical wavelength division multiplexer, receiving module, signal acquisition and processing module are arranged in sequence, the application carries out temperature sensing to the back Raman scattering light of the pulse while receiving the Rayleigh scattering light of the detection pulse, and controls the time interval of adjacent pump pulse and detection pulse to carry out three-bit pulse coding and decoding, so that the back Raman scattering signals of individual pulse in pulse pair are separated in time, and finally the simultaneous measurement of dynamic variable (vibration) and static variable (temperature, static strain) is realized and the spatial resolution of measurement is ensured not to be lost.

The present application relates to the field of on-line analysis of material chemical composition, and discloses an on-line monitoring process for the composition of a lead frame electroplating solution, comprising: calculating the concentration of the electroplating solution by conventional monitoring of the spectrum; calculating a spectrum entropy index based on the degree of deviation of the real-time spectrum from a pre-established statistical baseline model, and comparing the spectrum entropy index with a pre-set failure trigger threshold; starting a dynamic calibration step only when the spectrum entropy index exceeds the pre-set failure trigger threshold, the dynamic calibration step generating a model error vector by comparing the physically real differential spectrum with the model virtual differential spectrum through injection of a standard pulse, and correcting the chemometrics model using the model error vector, so that the present application realizes on-demand calibration, ensures real-time accuracy of the model, and reduces the consumption of the standard.

The application discloses a kind of mid-infrared discrete time stretching spectrum method, its characteristics are as follows:1) prepare the double-color pulse light source with slightly different repetition frequency;2) the pulse of pulse light source 1 is output wavelength broadening and time stretching for the signal light of nonlinear difference frequency, and the pulse of pulse light source 2 is output power amplification, for the pump light of nonlinear difference frequency;3) the time-domain broadening spectrum optical sampling of signal light by pump light pulse, obtain the pulse sequence of mid-infrared discrete time stretching;4) mid-infrared discrete chirp pulse is measured through low bandwidth mid-infrared detector after passing through the sample to be measured, and absorption spectrum information is obtained.The application has the advantages of wide band, high speed and high resolution compared with prior art, and the measurement of mid-infrared spectrum is completed by means of low bandwidth single-point detector, without dispersion spectrometer element and mechanical scanning device, which solves the problem of lack of time and high dispersion time-domain stretching medium in mid-infrared band, and expands the application of time stretching technology in mid-infrared band.