312 results about "Intensity modulation" patented technology

The invention relates to microwave-free sensor technology with NV centers in diamond. In contrast to the prior art, the intensity of the pump radiation is not PWM-modulated, but monofrequency and sinusoidally modulated. Further measures, such as the use of semiconductor-based pump radiation sources and operation with an offset, prevent the formation of harmonics in the temporal intensity profile of the pump radiation irradiating the NV centers in the sensor element. This allows the sensor system to use the phase shift to determine measured values ​​of external physical parameters such as magnetic flux density, acceleration, temperature, etc., within a recognized and disclosed frequency range of the intensity modulation of the pump radiation, thereby minimizing the influence of noise from the pump radiation source. The galvanic isolation does not need to be compromised by cables from additional sensors.

The invention relates to a phase-sensitive optical time domain reflectometer based on multi-frequency reference switching. Continuous laser generated by a continuous laser is divided into a local path and a detection path through an optical coupler; the local path is input to the polarization coherent receiving module, the detection path is incident to a light intensity modulator driven by the signal generation circuit module, and the light intensity modulator is converted into a multi-frequency pulse laser sequence with intensity modulation; the multi-frequency pulse laser sequence enters the sensing optical fiber to be measured through the optical circulator; generated Rayleigh backscattered light and local continuous laser are subjected to beat frequency coherent receiving in a polarization coherent receiving module through a circulator; and the signal acquisition circuit adopts a demodulation algorithm to compensate phase drift and sensitivity difference of detection pulse demodulation signals with different frequencies so as to realize dynamic strain sensing. Compared with the prior art, the phase drift and the sensitivity difference between the frequencies are extracted to realize the compensation of the interleaved signals, and the method does not depend on the fixed reference frequency, so that the robustness and the adaptability of the system in a complex environment are remarkably enhanced.

The invention relates to a phase-sensitive optical time domain reflectometer based on a parallel frequency division multiplexing sequence. Continuous laser is divided into a local path and a detection path through an optical coupler; the local path is input to the polarization coherent receiving module, the detection path is converted into a pulse laser sequence with intensity modulation through a light intensity modulator driven by a radio frequency signal provided by the signal generation circuit module, and the radio frequency signal is composed of two frequency division multiplexing sequences with difference; the pulse laser sequence enters the sensing link to be measured to generate Rayleigh backscattered light, and the Rayleigh backscattered light and local continuous laser are subjected to beat frequency coherent receiving through a circulator; and the signal acquisition circuit is used for sampling and analyzing the interference signal, and performing frequency domain comparison on an interleaving result of the two frequency division multiplexing pulse sequences to eliminate a harmonic frequency and retain a real strain signal frequency. Compared with the prior art, the non-harmonic strain signal measurement is realized, the high-frequency response performance and the high-precision strain measurement capability are excellent, and meanwhile, the long-distance coverage capability is also realized.

The invention relates to microwave-free sensor technology with NV centers in diamond. In contrast to the prior art, the intensity of the pump radiation is not PWM-modulated, but monofrequency and sinusoidally modulated. Further measures, such as the use of semiconductor-based pump radiation sources and operation with an offset, prevent the formation of harmonics in the temporal intensity profile of the pump radiation irradiating the NV centers in the sensor element. This allows the sensor system to use the phase shift to determine measured values ​​of external physical parameters such as magnetic flux density, acceleration, temperature, etc., within a recognized and disclosed frequency range of the intensity modulation of the pump radiation, thereby minimizing the influence of noise from the pump radiation source. The galvanic isolation does not need to be compromised by cables from additional sensors.

The invention discloses an optical computing array based on micro-ring resonators without a free spectral range, which comprises an on-chip wavelength division multiplexing beam splitting array, an on-chip intensity modulation array, two groups of on-chip wavelength division multiplexing beam combining arrays and an on-chip balance detector, the on-chip wavelength division multiplexing beam splitting array and the on-chip wavelength division multiplexing beam combining array are respectively composed of a group of multiple FSR-free MRRs which share the same bus optical waveguide, each resonator corresponds to an independent wavelength channel, and the on-chip intensity modulator array is composed of a plurality of groups of on-chip MZI modulator arrays. According to the optical calculation array implementation method, independent control and coding calculation of different wavelength channels in a broadband wavelength range are realized by utilizing the single harmonic peak characteristic of the FSR-free MRR array and the wide-spectrum intensity modulation function of the MZI unit, the limitation of a free spectrum range on the optical calculation wavelength channel is eliminated, the higher wavelength parallelism is achieved, and the optical calculation array implementation method has the advantages of being simple in structure and convenient to implement. And therefore, the calculation scale is remarkably improved.

A method and system for optical communication with simultaneous transmission of bits of information and distribution of cryptographic key bits using laser beam intensity modulation in a transmitter and using direct detection in a receiver. A laser beam of a specific optical carrier wavelength is modulated according to a common set of modulation symbols encoding simultaneously information bits and cryptographic key bits, symbols differing in at least one parameter selected from the group with light intensity and time delay, wherein the symbols used to encode different key bits differ in light intensity.

The present disclosure relates to the technical field of optical computing, and particularly relates to an intelligent optical computing chip cluster architecture and system. The architecture comprises: a plurality of optical computing chips, and optical path channels are established between the plurality of optical computing chips by using spatial phase adjustment to modulate light beams; and high-speed optical communication and optical diffraction network computing are performed between the plurality of optical computing chips by performing time-domain intensity modulation on the optical path channels. The present disclosure adopting the above scheme can realize the interconnection computing of optical computing chips in the spatial dimension, and does not rely on electricity for information transmission.

A semiconductor light-receiving element (100) according to the present disclosure comprises: a substrate (1); a first mesa structure (30) having at least an n-type semiconductor layer (2, 3), a multiplication layer (4), a p-type electric field relaxation layer (5), a light absorption layer (6), and an i-type semiconductor layer (8) having a larger band gap than the light absorption layer (6), said layers being sequentially formed on the substrate (1); a second mesa structure (31) having at least a window layer (9) having a larger band gap than the light absorption layer (6), the second mesa structure (31) being formed on the first mesa structure (30); and a terrace part (40) comprising the outermost surface of the first mesa structure (30) exposed to the outer-peripheral side of the second mesa structure (31).

The invention discloses an optical fiber laser phased array self-adaptive optical system based on an integrated optical chip. The optical fiber laser phased array self-adaptive optical system comprises a self-adaptive optical fiber coupler array, the integrated optical chip, an optical fiber splitter, a photoelectric detector, a control platform and a high-voltage amplifier. The integrated optical chip comprises an optical fiber coupling interface, a waveguide, a phase shifter, a Mach-Zehnder intensity modulator and the like. The adaptive optical fiber coupler array couples incident light to the optical fiber array, and corrects tilt aberration based on an optimization control algorithm to realize efficient adaptive coupling of spatial light to optical fibers; the sub-beams enter an integrated optical chip through an optical fiber coupling interface, phase and intensity modulation is performed on the sub-beams in the optical chip based on an optimization control algorithm, and co-phase synthesis output of the beams is realized; the output light is divided into two paths by the optical fiber splitter, one path is connected with the photoelectric detector for control, and the other path is connected with the application end. Based on light path reciprocity, the system has a transmitting or receiving and transmitting integrated function, and has important application prospects in the fields of space optical communication, laser energy transfer and the like.

The invention belongs to the related technical field of sensors, and provides a multi-parameter integrated acquisition optical fiber sensor and a monitoring system thereof in order to solve the problem that high-precision monitoring of a static signal and a dynamic signal is difficult to consider by an existing sensor at the same time, a sensing cavity is sequentially divided into a static signal sensing area and a dynamic signal sensing area in the axial direction; the static signal sensing area adopts a multi-core fiber, fiber gratings are respectively engraved on the multi-core fiber, and the wavelength demodulation of the static signal is realized through the central wavelength drift distance of the fiber gratings; the dynamic signal sensing area is provided with a dynamic signal sensing unit, the dynamic signal sensing unit comprises F-P air microcavities formed between the dynamic signal sensing unit and the end faces of all fiber cores of the multi-core optical fiber, and intensity demodulation of dynamic signals is achieved through cavity length changes of the F-P air microcavities. According to the invention, a wavelength modulation and intensity modulation parallel composite demodulation mechanism is adopted, and decoupling acquisition of static strain, temperature and dynamic vibration is realized in a single sensor.

A stimulated Raman photothermal (SRP) microscope for imaging a sample. A first optical source without an optical resonator emits a pump beam. A second optical source emits an intensity-modulated Stokes beam. The Stokes beam is combined with the pump beam to form a combined beam. The combined beam is directed to the sample to induce a thermal effect caused by the stimulated Raman process. A third optical source emits a probe beam, the probe beam is directed to the sample. An optical detector detects modulation of the probe beam after modulation by the sample to measure an SRP signal. Because noise in the pump and Stokes beam do not significantly effect the measurements from the probe beam, these beams can use a high-powered optical parametric amplifier (OPA) source for improved sensitivity and imaging speed compared to SRP microscopes using an optical parametric oscillator (OPO) source.

The invention relates to the technical field of wafer detection, in particular to a wafer surface defect detection system and method.The system comprises an imaging module, the imaging module comprises at least two sets of imaging channels, each imaging channel comprises an imaging camera for collecting light signals and converting the light signals into image signals, and a light modulation assembly is arranged in each imaging channel; the light modulation assembly performs polarization modulation and light intensity modulation on emergent light reflected or scattered by the surface of the wafer; the polarization control module adjusts the rotation angle of the light modulation assembly in each imaging channel; the signal processing module carries out differential operation on different image signals, light rays emitted by the multiple groups of imaging channels are set with different polarization parameters and light intensity parameters through the light modulation assembly, multiple groups of image signals are obtained, and an imaging image about scattered light of the same detection area is formed. The imaging image comprises an image with the defect signal as weak as possible and an image with the defect signal as strong as possible, and the imaging image with the defect signal enhanced can be obtained through differential operation.

Provided is a time-stretch spectroscopy device capable of restoring an original spectrum without using a high-speed modulation system or reception system even if temporally adjacent pulses overlap after stretching. This time-stretch spectroscopy device comprises: an optical modulator that performs intensity modulation in pulse units on a group of measurement light pulses, which are obtained by irradiating a measurement object having characteristics relating to light transmittance or reflectance with a group of light pulses; a pulse stretcher that performs time stretching on the group of measurement light pulses; and a signal processing device that, with the assumption that the measurement light pulses are sparse as data, performs a reconfiguration estimating pulse signal wavelength components corresponding to the stretched light pulses, which are obtained by individually time stretching the group of measurement light pulses, in light of a superimposition signal synthesized such that a temporal overlap occurs after the time stretching.

The invention relates to the technical field of textile detection, in particular to a textile surface defect detection method and a textile surface defect detection system, which are used for carrying out online detection on a textile of which the surface is coated with a thermosensitive coating, and the method comprises the following steps: applying preset periodic intensity modulation to a detection light source used for online detection, generating a reference sequence serving as a synchronism analysis benchmark; collecting a series of brightness values of the suspected defect points within a preset time period under the periodic intensity modulation aiming at the suspected defect points, which are preliminarily identified, on the surface of the textile, so as to form a brightness response sequence representing the optical response characteristics of the suspected defect points; calculating a time synchronization degree between the brightness response sequence and the reference sequence; by distinguishing the temporary thermal effect artifacts and the real physical defects, the method has the advantages that the temporary optical artifacts and the real physical defects caused by the thermal effect can be effectively distinguished, the false alarm rate is reduced, and the detection accuracy is improved.

The invention provides a photoacoustic sensor and a sensing system for trace C4F7N gas detection, and relates to the technical field of C4F7N gas detection. The system comprises a broadband light source used for generating wide-spectrum infrared light; the modulation unit is used for carrying out intensity modulation on the wide-spectrum infrared light; the photoacoustic cell is used for receiving the modulated light beam and exciting C4F7N gas to generate a photoacoustic signal; the sound detector is used for detecting a photoacoustic signal; the signal processing unit is used for processing the photoacoustic signal to obtain the C4F7N gas concentration; the broadband light source is a blackbody radiation source; the photoacoustic cell is a spherical Helmholtz resonant cavity, is of a differential structure and comprises two spherical resonant cavities; and the two sound detectors are symmetrically arranged on the cavity walls of the two spherical resonant cavities. The black-body radiation source is used as a broadband light source, and the differential spherical Helmholtz photoacoustic cell is coupled with the black-body radiation source, so that the system cost and the integration complexity are remarkably reduced on the premise of keeping the advantage of high sensitivity.

The invention relates to a quantum key distribution method and device based on a double-field protocol, and a storage medium, and the method comprises the following steps: carrying out the phase and intensity modulation of an initial laser pulse through a quantum state preparation device, and generating a double-field quantum state sequence containing a first quantum state sequence and a second quantum state sequence; the sequences are subjected to polarization state coding and time division multiplexing through a quantum channel transmission device to form a coded quantum state transmission sequence. The sequence is then subjected to phase compensation and noise suppression to obtain an optimized quantum state sequence. And then, the quantum state measurement device executes Bell state measurement and basis vector selection on the optimized sequence to obtain a measurement result sequence. And finally, the post-processing device performs key extraction and privacy amplification on the measurement result to ensure that a final quantum key is generated, so that the technical problem that the practicability and the transmission distance of a traditional quantum key distribution scheme are greatly limited due to the influence of channel loss and noise interference factors is solved.

A stimulated Raman photothermal (SRP) microscope for imaging a sample. A first optical source without an optical resonator emits a pump beam. A second optical source emits an intensity-modulated Stokes beam. The Stokes beam is combined with the pump beam to form a combined beam. The combined beam is directed to the sample to induce a thermal effect caused by the stimulated Raman process. A third optical source emits a probe beam, the probe beam is directed to the sample. An optical detector detects modulation of the probe beam after modulation by the sample to measure an SRP signal. Because noise in the pump and Stokes beam do not significantly effect the measurements from the probe beam, these beams can use a high-powered optical parametric amplifier (OPA) source for improved sensitivity and imaging speed compared to SRP microscopes using an optical parametric oscillator (OPO) source.

The invention discloses a high-precision photon digital-to-analog conversion system based on noise shaping, which is characterized in that a mode-locked laser generates an optical pulse sequence, optical pulses enter a dispersive medium, and periodic pulses are processed by using a fractional order Talbot effect, so that the pulse repetition frequency is improved; the Delta-Sigma (Delta Sigma) modulation module processes a preset target signal and shifts noise to a high frequency band based on an oversampling technology and noise shaping to realize conversion from an analog signal to a digital signal; the pulse signal with the repetition frequency increased is input into the electro-optical modulation module to serve as a sampling source, and a digital signal generated by the delta-sigma modulation module is input into the electro-optical modulation module for intensity modulation, so that the optical pulse carries the characteristics of frequency change and noise shaping of the signal, and fusion from electric signal modulation to optical signal modulation is completed; inputting the pulse signal after electro-optical modulation into a photoelectric detector, and converting an optical signal into an electric pulse signal; the electric pulse signal enters a filtering module, noise in the electric signal is filtered out, and an analog signal is obtained.

The measurement of overlay using a microscope-based sensor is described. This provides, among several advantages, the ability to measure alignment and overlay in a single system. The signal from the sensor is an intensity-modulated fringe pattern (e.g., an interference pattern). The sensor is configured to generate an intensity-modulated fringe pattern based on diffracted radiation received from a first metronome mark on a first layer of the pattern substrate and a second metronome mark on a second layer of the pattern substrate. The intensity-modulated fringe pattern is filtered for the expected fringe period. The overlay value is determined using the amplitude, phase, and / or other parameters of the fringe in the filtered fringe pattern.

The invention discloses a radar signal identification method based on photon parameter mapping. The method comprises the following steps: S1, generating two paths of homologous optical carriers; s2, processing the first path of optical carrier into a linear frequency modulation optical signal; performing intensity modulation on the second path of optical carrier wave by using the radar signal to be measured, and introducing delay inequality between two cross-polarization components of the generated modulation optical signal; s3, after the two paths of optical signals are combined, balanced photoelectric detection is carried out, and electrical filtering and envelope detection are carried out in sequence; s4, inputting the data into a modulation type identification module in a digital domain for modulation type identification; inputting the obtained modulation type time sequence into a state recognition module for state recognition; the modulation type identification module and the state identification module are pre-trained deep learning models. The invention also discloses a radar signal identification device based on photon parameter mapping. According to the method, the radar signal modulation type and state can be accurately and rapidly identified through low-speed analog-to-digital conversion.

The invention provides a photoacoustic gas measurement method and a photoacoustic gas measurement system based on a series sensibilization technology, and relates to the technical field of optical gas sensing. The first-stage light absorption enhancement structure is used for carrying out maximum photoacoustic conversion on target gas to generate an initial photoacoustic pressure signal, the second-stage acoustic resonance structure is introduced to carry out resonance amplification on sound waves with specific frequency, a tandem cascade sensibilization framework of light absorption enhancement and acoustic resonance amplification is constructed, and through mutual verification analysis, the sensitivity of the target gas is improved. Calculating coherence outside preset noise analysis frequency band data, identifying and inhibiting common-mode noise interference caused by environment vibration and the like, generating feedback control parameters while calculating final gas concentration, adaptively adjusting intensity modulation frequency and wavelength modulation depth, and realizing high-precision and high-precision measurement. The measurement reliability, the dynamic range and the adaptive capacity of the system under complex working conditions are improved, and multiplier-level breakthrough of the sensitivity of the system and collaborative optimization of the performance are achieved.

The invention provides an optical high-dimensional data time domain compression calculation method and system based on Hilbert mapping, and the method comprises the steps: employing a Hilbert mapping method, enabling original high-dimensional data to be expanded into a one-dimensional vector from a memory according to the dimension and size Size of the original high-dimensional data and a Hilbert curve with the order n of the same dimension, and carrying out the time domain compression calculation of the original high-dimensional data, and a digital-to-analog converter drives a high-speed optical modulator to load the vector to the time-varying intensity of the optical carrier so as to form signal light. Then, the signal light enters a basic time domain optical operation unit to be further processed, including weighted secondary intensity modulation, or optical difference (or differential) operation used for extracting a neighborhood information change relation and the like. And finally, vector information carried by the processed one-dimensional time domain signal light is extracted and stored, Hilbert inverse mapping of a corresponding dimension is carried out on the vector information, and the vector information is restored into high-dimensional feature information for subsequent operations such as judgment, segmentation and the like by an artificial intelligence algorithm.

The invention belongs to the technical field of optical calculation, and particularly relates to an intensity-phase mixed silicon-based photon modulator. According to the hybrid silicon-based photon modulator, a PIN micro heater formed by ion implantation is integrated on two arms of a Mach-Zehnder interferometer or a micro-ring resonator, and a phase change material and a protective layer are deposited in a window above the micro heater; electric pulses are applied to metal electrodes at the two ends of the micro heater to drive local reversible crystalline and amorphous transformation of the phase change material, and phase modulation of passing optical signals is achieved; meanwhile, constant voltage signals are applied to the two ends of the PIN micro heater, and intensity modulation is generated on passing optical signals through the carrier absorption effect. The two modulation modes are mutually independent and do not interfere with each other, and two groups of independently variable weight values can be stored in the device. The hybrid silicon-based photon modulator can be used in a large photon neural network, high-speed and high-parallelism convolution operation is carried out, and the overall end-to-end insertion loss of a chip is reduced.

The invention discloses a device and a method for testing frequency domain characteristics of a high-speed optoelectronic device. The device comprises a laser, a sawtooth wave generator, a signal source, an acousto-optic modulator, an electro-optic intensity modulator, a low-frequency photoelectric detector, a frequency spectrograph and a computer. An electro-optic intensity modulator is driven through a sawtooth wave modulation technology, and frequency-shifted and non-frequency-shifted optical carriers and frequency-shifted and non-frequency-shifted radio frequency optical sidebands are synchronously generated in an optical path in combination with radio frequency signal modulation. And after the signal is subjected to beat frequency processing by the photoelectric detector, the power of the frequency shift signal in different working states is measured by the frequency spectrograph, so that the frequency domain characteristic parameters of the photoelectric device to be measured are obtained. The method is based on sawtooth wave modulation and an amplitude comparison method, frequency domain response characteristics of a single / dual-drive electro-optic intensity modulator, dual-parallel electro-optic intensity modulation and a photoelectric detector can be accurately represented, the test method is simple, and dependence on a high-frequency test instrument is effectively reduced.

The invention belongs to the technical field of intelligent optical fiber devices, and particularly relates to a multi-core optical fiber neuron and optical fiber sensing mode recognition system which comprises a regulation and control pulse light module, an optical fiber sensor module, a seven-core optical fiber neuron module and a photoelectric detection module. The pulse light regulation and control module is used for regulating and controlling the combined continuous laser into pulse laser so as to obtain pulse light, and after feedback pulse light energy is coupled, the pulse light enters the optical fiber sensor module; the optical fiber sensor module is used for sensing external sensing information and then carrying out intensity modulation on incident pulsed light, and the intensity-modulated pulsed light with various wavelengths is combined and then incident into the seven-core optical fiber neuron module. According to the invention, the seven-core optical fiber can be used as the substrate to construct the seven-core optical fiber neuron so as to realize an all-optical mode identification task.

An optical computing system includes: an intensity modulation device group including at least two intensity modulation devices, each of which includes modulation cells, wherein each of the modulation cells of each of the intensity modulation devices carries out intensity modulation with respect to carrier light in accordance with one of signals to generate a signal light beam, and each of the signals corresponds to each of the intensity modulation devices; and a light diffraction element including diffraction cells having respective thicknesses or refractive indices set independently of each other, wherein each of the diffraction cells receives the signal light beam from each of the modulation cells of each of the intensity modulation devices corresponding to each of the diffraction cells, and by causing signal light beams to have respective different optical path lengths to the light diffraction element, the signal light beams have respective different phases.

The invention belongs to the technical field of intelligent sensors, and particularly relates to a high-resolution velocity field image optical measurement method and system based on coherent detection. The method comprises the specific steps that light output by an intensity modulation laser is split into reflected light and reference light, the reflected light passes through a reflected light path and then enters an object to be measured, and the reference light passes through a reference light path and then enters a coherent image sensor together with a reflected light beam reflected by the object to be measured; the coherent image sensor comprises a space bridge and four charge-coupled devices, the space bridge splits incident light into four paths through beam splitting control, so that the four paths of incident light are uniformly distributed on the four charge-coupled devices, and the space bridge regulates the polarization state of the incident light; after a set integral exposure time, the controller collects voltage signals in each pixel unit of the four charge-coupled devices, combines the voltage signals and performs coherent processing to obtain a fundamental frequency signal, and calculates a target speed according to the fundamental frequency signal.

A waveguide is coupled at both ends to a microring (MRR) modulator in order to form a Mach-Zehnder interferometer out of the resulting unit. The coupled waveguide can be modulated independently from the MRR modulator itself with either an in-resonance photoconductive heater or a geometrically suitable PN junction. During modulation with an applied voltage to the coupler, an independent modulation can be applied to the MRR in order to compensate for wavelength shifting. Ideal lengths for the coupler are identified, as well as a spiral configuration to reduce the coupler's footprint on a photonic integrated circuit. The resulting device has reduced cross-talk between channels of a cascaded MRR system. A second coupler can be coupled to each MRR symmetrically so as to reduce insertion losses, allowing for an increased weight range at the drop and through ports.

This invention discloses a wavelength locking system for a silicon oxide microring resonator, comprising a photoelectric conversion module, a feedback control module, a radio frequency drive module, an interdigital transducer, a zinc oxide film, a lock-in amplifier module, two analog-to-digital conversion modules, and a digital-to-analog conversion module. The radio frequency drive module generates an alternating electrical signal and applies it to the interdigital transducer, causing the zinc oxide film to vibrate mechanically and generate surface acoustic waves that propagate to the vicinity of the silicon oxide microring resonator, inducing mechanical stress and strain, changing the refractive index distribution of the silicon oxide microring resonator, and modulating the frequency, phase, and intensity of the internal optical signal. The feedback control module adjusts the thermal power of the microring heater based on the voltage signals output by the lock-in amplifier module and the photoelectric conversion module, thereby adjusting the resonant wavelength of the silicon oxide microring resonator and locking the wavelength of the optical signal output by the silicon oxide microring resonator to the target wavelength. The advantage is that it can accurately lock the wavelength of the silicon oxide microring resonator, resulting in a high wavelength locking effect.

The present invention proposes a device for measuring particle velocity under strong background interference using modulated laser light. The device comprises a laser light intensity modulation system for modulating the laser light into a laser with varying intensity according to a modulation frequency; a data acquisition and processing system for collecting the scattered light signal from the particles when the laser light of varying intensity irradiates the particles, performing a bandpass filter on the scattered light signal centered on the modulation frequency, and obtaining the particle velocity based on the bandpass filtered scattered light signal. The device proposed by the present invention is suitable for measuring particle velocity under strong background interference and can solve the problem of particle velocity measurement failure caused by strong background noise during the measurement process.