48 results about "Phase conjugation" patented technology

The invention discloses a high geological disaster chain risk quantitative assessment method adapted to a high-cold and high-altitude environment, and relates to the technical field of geological disaster monitoring and prevention and control, and the method comprises the following steps: S100, building an irradiation and reflection combined observation layer, collecting the dynamic intensity of direct light and reflected light, generating an exposure time sequence fingerprint baseline, and obtaining an exposure time sequence fingerprint baseline; and determining a critical threshold value of the direct light intensity according to the base line. The method comprises the following steps: constructing an irradiation and reflection combined observation layer to extract light intensity characteristics, and generating an exposure time sequence fingerprint baseline; a trigger point boundary is extracted by adopting coherent phase decomposition and anti-fact playback, and a continuous track is reconstructed; the overexposure risk is predicted based on the time-frequency score, and spectrum gating and polarization rotation are linked to regulate and control the exposure rhythm; and reverse phase traction and phase conjugate intervention are implemented in a steady-state window, so that boundary information is maintained and the risk identification precision is improved.

The invention discloses a digital twinborn intelligent travel management system and method, and relates to the technical field of travel interaction, and the method comprises the following steps: building a multi-projection unified phase baseline and energy distribution auditing model, carrying out the nanosecond-level synchronous sampling of the phase difference and brightness change curve of a plurality of projection light waves in a virtual-real superposition region, and carrying out the nanosecond-level synchronous sampling of the phase difference and brightness change curve of the multi-path projection light waves in the virtual-real superposition region; generating a corresponding initial light field energy coupling matrix; and constructing an interference trajectory inversion network based on the initial light field energy coupling matrix, and replaying the light wave superposition sequence by using a time inversion algorithm. According to the invention, accurate monitoring and active regulation and control of light field energy are realized through unifying a phase baseline and energy auditing, interference focusing and brightness mutation are effectively eliminated, and visual stability and immersion experience are improved; and energy self-adaptive balance and dynamic closed-loop control are realized through phase conjugate driving and spectrum inverse diffusion gating, so that safe operation of a light field and soft and stable brightness are ensured, and a comfortable and healthy digital twinborn travel light environment is created.

The invention discloses a dynamic encryption transmission method and system for sound-light alarm signals, and relates to the field of data encryption, and the method comprises the steps: obtaining a dynamic environment entropy value; generating a pseudo-random chaotic sequence; obtaining a helium-oxygen mixed gas density parameter in the dynamic environment entropy value; segmenting a preset standard alarm waveform into a plurality of signal waveforms in a time domain, and generating a distorted signal waveform according to the helium-oxygen mixed gas density parameter; performing encryption modulation on the distorted signal waveform to generate an encrypted distorted signal waveform; determining a sending sequence and a sending interval of the encrypted distortion signal waveform by combining a pseudo-random chaos sequence based on an impedance fluctuation value and background acoustic spectrum characteristics in the dynamic environment entropy; generating a dynamic modulation signal based on the transmission sequence and the transmission interval; the dynamic modulation signal is sent to a water surface console through an umbilical cable; and receiving the guide pulse, performing phase conjugation processing on the guide pulse, generating an echo verification signal, and transmitting the echo verification signal back to the water surface console.

The invention discloses a road intelligent diagnosis method based on an AI large model, and relates to the technical field of road engineering detection, and the method comprises the following steps: building a unified time base line, constructing a phase reference field, injecting a calibration pulse, separating dynamic shadow time sequence texture and crack initial features in a road image sequence, and obtaining a road image sequence; generating prior information of dynamic shadows and cracks; under the constraint of prior information, polarization spectrum three-dimensional coding imaging is carried out, polarization angle distribution and spectrum gradient are extracted, a feature dictionary of dynamic shadows and cracks is constructed, and phase drift in the prior information is calibrated. According to the method, a unified time base line and a phase reference field are constructed, and accurate distinguishing of dynamic shadows and cracks is realized by combining polarization spectrum imaging and anti-fact distillation; the point cloud and acceleration data are fused for geometric reconstruction, and through phase conjugate extinguishing and closed-loop feedback, the continuity and accuracy of diagnosis are significantly improved, and maintenance error decisions caused by misjudgment are avoided.

The invention relates to the technical field of optical element surface physical property testing, and discloses an optical element surface pattern structured light testing system which comprises the steps that a pair of phase-conjugated structured light fields are adopted to alternately illuminate an optical element, and Fourier domain diffraction patterns and spatial domain in-situ light field intensity distribution of the optical element are synchronously collected; according to the method, a common-mode signal cancellation mechanism aiming at a defect-free periodic pattern is preset on a physical level through conjugate illumination and differential processing, so that massive redundant information is suppressed, and the defect position is determined by calculating a differential signal after a diffraction pattern is corrected by using in-situ light field intensity distribution. According to the method, only asymmetric scattering signals caused by defects are reserved and highlighted, so that the focus of detection is changed from measurement of the accuracy of geometrical morphology to discrimination of the uniformity of optical response physical properties of materials, and high-signal-to-noise-ratio rapid discrimination of functional defects is realized.

The invention discloses a light weapon shooting training intelligent target range data processing method and system, and relates to the technical field of target range data processing, and the method comprises the following steps: constructing a nanosecond-level unified time baseline, and carrying out the synchronous collection of multi-source sensing signals of a shooting training target range through a high-resolution optical array and an acoustic sensing matrix, and performing time synchronization and delay compensation on each sensing signal through a phase alignment mechanism to form a unified sensing base plane for multi-target recognition. According to the method, high-precision synchronous acquisition and interference feature stripping are realized by constructing a nanosecond-level unified time base line and fusing multi-source sensing, and the target distinguishing and recognition precision under a complex background is remarkably improved; and meanwhile, a space-time coupling identification and anti-fact playback mechanism is combined, a dynamic credibility map is generated, phase conjugate regulation and control are implemented, an identification and correction closed loop is formed, misjudgment and drift are effectively reduced, and stable tracking and continuous identification in a multi-target scene are ensured.

The invention discloses a light and small unmanned aerial vehicle multi-view VR video acquisition and synthesis method, and relates to the technical field of video acquisition and processing, and the method comprises the following steps: obtaining a unified time baseline, building an overlapping boundary time sequence index, locking a zero phase anchor point, and outputting a millisecond-level boundary event sequence; under the constraint of a boundary event sequence, obtaining boundary occlusion priori, constructing a dynamic visibility probability field and marking a potential occlusion kernel; and under the support of a dynamic visibility probability field, acquiring a cross-view delay gradient, applying constraint to a potential occlusion nuclear region, injecting phase traction test to a boundary event sequence, and finishing multi-camera clock fine tuning based on a feedback result. According to the method, the unified time base line and the dynamic visibility probability field are constructed, multi-camera synchronous acquisition and shielding area tracking are realized, a seamless splicing track is generated in combination with clock fine tuning and geometric constraint, black frame skipping is eliminated through luminosity consistency mapping and phase conjugate frame injection, and picture continuity and immersion experience stability are guaranteed.

The application provides a kind of multi-core optical fiber based rotating object rotational speed measurement method and system, the method is by generating the detection light field with specific spatial structure, transmission through multi-core optical fiber and phase modulation obtains the preset structure of the exit light field;The light field is used to irradiate the rotating object, receive the reflected signal and return through the same path, detect the signal intensity change to obtain the time domain signal;Frequency shift information is obtained by frequency domain analysis and the angular velocity is calculated.The method realizes the flexible regulation and control of the light field multi-degree of freedom by the combination of spatial light modulator and multi-core optical fiber, breaks through the limitation of insufficient existing regulation and control degree of freedom;The requirement for optical axis alignment accuracy is reduced by using structured light field;The system miniaturization is realized by using flexible multi-core optical fiber, and the problem of narrow space application is solved;The parallel transmission and anti-interference characteristics of multi-core optical fiber are fully utilized, and the measurement stability and precision in complex environment are significantly improved by digital phase conjugation and transceiver integrated design.

The invention relates to a laser chaotic secret communication system based on coherent pumping phase conjugation, which belongs to the technical field of laser communication and comprises a signal transmitting module, an optical fiber link module, a conjugate transpose module and a signal receiving module. The signal transmitting module generates and modulates a chaotic carrier optical signal, and data encryption is realized through phase modulation; the optical fiber link module is used for long-distance signal transmission; the conjugate transpose module adopts an optical comb to generate coherent pump light, and generates phase conjugate waves through four-wave mixing to realize compensation of dispersion and nonlinear distortion in an optical fiber link; and the signal receiving module recovers original data through chaotic synchronization, coherent detection and digital signal processing. The phase locking characteristic of coherent pumping is utilized, the phase noise influence in a traditional pumping system is reduced, the stability of the system is improved, the anti-interference performance of chaotic secret communication and the transmission quality of the system are improved, and a feasible scheme is provided for achieving high-fidelity and high-safety long-distance optical communication.

The invention provides a stress response type wavefront compensation method and system for a wavefront modulation module, and relates to the technical field of wavefront modulation.The stress response type wavefront compensation method comprises the steps that multiple sets of known stress distribution and corresponding wavefront distortion data on an optical panel are obtained, and a mapping model of stress distribution to wavefront distortion is established; in the working process, the stress distribution of the optical panel is monitored in real time through the force sensing unit array, a mapping model is input to calculate and predict wavefront distortion, a phase conjugate compensation diagram is generated and superposed into a driving phase diagram, and the actual reflection wavefront and the compensation wavefront of the optical panel are counteracted mutually, so that the wavefront modulation precision is improved.

The present invention relates to a method for determining an image referred to as a reconstructed image, the method comprising the following steps: a training step for reconstructing distortion correction using training data; and an inference step (Ei) comprising determining the reconstructed image by means of a phase conjugation method; the training step comprising training a variational network.

The invention belongs to the field of optical fiber communication, and discloses a dispersion simulation transmission link based on analog signal processing and a dispersion simulation method, and the dispersion simulation transmission link comprises a coherent transmitter, an IQ modulator, lasers with different wavelengths, a coherent receiving chip (ICR), a Bragg dispersion compensation grating (FBG-DCM) and a coherent receiver. Data is sent out from a coherent transmitter, firstly passes through an ICR, a light field is converted into an electric field, and the electric field is modulated into a new light field by an IQ modulator. Two paths can be selected at the output end of the ICR, the first path is connected to the IQ modulator and is subjected to secondary emission by utilizing intrinsic light with different wavelengths, the wavelength can be converted to an FBG-DCM compensation window, and after the steps, the ICR is used for receiving and then is converted to the original wavelength by utilizing the IQ modulator to be sent, so that the superposition of negative dispersion is realized; and the second path is connected to the IQ modulator, secondary emission is carried out by utilizing intrinsic light with different wavelengths, phase conjugation is realized, meanwhile, conversion to an FBG-DCM compensation window is realized, and superposition of positive dispersion is realized through the above steps after ICR receiving.

A receiver convolves an impulse response for compensating for frequency characteristics and a complex impulse response for wavelength dispersion compensation with each of a real component and an imaginary component of each polarized wave of a reception signal. For each polarized wave, the receiver performs complex signal processing of multiplying the imaginary component by the imaginary unit, then branching the resulting component, and adding one imaginary component to the real component. For each polarized wave, the receiver uses, as input signals, the real component and the imaginary component of each polarized wave after complex signal processing and the phase conjugates of them. For each polarized wave, the receiver adds a signal obtained by a process in which each of the real component and the imaginary component of each polarized wave is multiplied by a complex impulse response, the resulting components are added, and a phase rotation is applied and a signal obtained by a process in which each of the phase conjugate of the real component and the phase conjugate of the imaginary component of each polarized wave is multiplied by a complex impulse response, the resulting components are added, and an opposite phase rotation is applied, and adds a transmission data bias correction signal.

The invention discloses a novel polypeptide synthesizer, which relates to the technical field of polypeptide synthesis, and comprises a ternary cooperative signal modeling module, a bubble time sequence analysis module, a photoacoustic coupling compensation module, a bubble discharge and circulation control module, a dynamic stability adjustment module and a self-correction optical path shaping module, establishing a ternary collaborative baseline of an ultraviolet detection signal, a pressure detection signal and a flow detection signal, reconstructing a flow cell optical path distribution model, extracting optical path refraction fingerprints, and forming a gas-liquid interface coupled dynamic monitoring reference system. The method is oriented to the field of biological medicine manufacturing, bubble recognition, flow path purification and optical path self-correction are achieved through the photoacoustic coupling detection and phase conjugate optical path shaping technology, a closed-loop control system with memory and feedback functions is constructed, and the accuracy, stability and automation level of the polypeptide synthesis process are remarkably improved.

The invention discloses an early laryngeal cancer grading method based on laryngoscope image deep learning, and relates to the technical field of medical image intelligent diagnosis, and the method comprises the following steps: S1, in an image collection process, establishing a cross-time-scale optical and time sequence combined observation baseline, injecting a micro-amplitude polarization mark through multi-frame image collection, constructing a specular reflection path dictionary, and obtaining a specular reflection path dictionary; generating a highlight false peak prior map, and forming a space-time anchor point for positioning a reflection area; and S2, performing image matching operation based on the highlight false peak prior map, extracting a brightness anomaly core region by applying a phase congruency spectrum and curvature gradient combined verification mechanism, separating specular reflection artifacts from real lesion features, and constructing an edge evidence set to express a lesion structure contour. According to the method, the reflection prior map and a causal checking mechanism are constructed, phase conjugate regulation and control and light field remodeling are combined, accurate inhibition of specular reflection artifacts and stable extraction of focus characteristics are achieved, and grading accuracy and diagnosis reliability of laryngoscope images in a dynamic scene are improved.

The invention relates to the technical field of vehicle-mounted electronics, in particular to a vehicle-mounted video interference suppression method and system based on EMC optimization, and the method comprises the steps: building a transmission reference model; comparing the model with a composite signal on a transmission link in real time, extracting a holographic electromagnetic wave interference component through holographic differential processing, analyzing an amplitude-phase transfer function, and generating a reverse holographic electromagnetic wave through phase conjugate inversion; reverse holographic electromagnetic waves are coupled and injected into a link through a distributed holographic modulation array, and coherent cancellation is carried out on the reverse holographic electromagnetic waves and original interference; residual interference is monitored at the downstream of the link, and the offset effect is dynamically optimized through an adaptive weight updating algorithm. According to the invention, channel noise in a transmission link is eliminated from the source through active cancellation, the technical problem that a video signal is submerged by noise before reaching a receiving end in a strong electromagnetic interference environment is solved, and the suppression effect under complex and changeable working conditions is ensured through a self-adaptive closed-loop system. And the transmission reliability and fidelity of the vehicle-mounted video signal are obviously improved.

The invention relates to an active integrated electronic reflector based on a dielectric integrated suspended line. The active integrated electronic reflector comprises a receiving antenna array, a transmitting antenna array, a cross interconnection phase conjugate network, an antenna-to-SISL transmission line structure and an active device, the receiving antenna array and the transmitting antenna array are respectively communicated with the cross interconnection phase conjugate network based on an antenna-to-SISL transmission line structure; the cross interconnection phase conjugate network comprises a plurality of double-layer SISL transmission line structures used for forming an SISL transmission channel; the total lengths of the SISL transmission channels are the same; the double-layer SISL transmission line structures adopt interlayer intersection at the intersection; the active device and the double-layer SISL transmission line structure are integrated; incident waves in any direction received by the receiving antenna array pass through the cross interconnection phase conjugate network, and reflected waves in the same propagation direction are transmitted by the transmitting antenna array. According to the scheme, high performance, high reliability and high manufacturability are achieved, and the requirements for integration and miniaturization of radar target characteristic regulation and control are met.

The invention provides a method and system for measuring the rotating speed of a rotating object based on a multi-core optical fiber, and the method comprises the steps: generating a detection light field with a specific space structure, transmitting the detection light field through the multi-core optical fiber, and carrying out the phase modulation, thereby obtaining an emergent light field with a preset structure; irradiating a rotating object by using the light field, receiving a reflected signal and returning through the same path, and detecting the intensity change of the signal to obtain a time domain signal; frequency shift information is obtained through frequency domain analysis, and the angular velocity is calculated. According to the method, through combination of the spatial light modulator and the multi-core optical fiber, multi-degree-of-freedom flexible regulation and control of a light field are realized, and the limitation of insufficient regulation and control degree of freedom in the prior art is broken through; the requirement on optical axis alignment precision is reduced by utilizing the structured light field; the system miniaturization is realized by adopting the flexible multi-core optical fiber, and the application problem in a narrow space is solved; parallel transmission and anti-interference characteristics of the multi-core optical fiber are brought into full play, and the measurement stability and precision in a complex environment are remarkably improved in cooperation with digital phase conjugation and transmit-receive integrated design.

An all-optical signal processor includes one or more input ports configured to receive one or more optical signal channels, a first nonlinear optical processor configured to receive an input signal from the input port and having one or more sections of a first nonlinear medium, an optical phase conjugator optically configured to receive the output signal of the first nonlinear optical processor, a second nonlinear optical processor configured to receive an output signal from the optical phase conjugator and having one or more sections of a second nonlinear medium, and one or more output ports configured to receive the output signal from the second nonlinear optical processor. Variations of the all-optical signal processor can include a single nonlinear optical processor through which an output of the optical phase conjugator co-propagates or counter-propagates with the input signal.

This invention provides a demodulation method and system for free-space optical communication links based on helical fractional orbital angular momentum. N data streams are loaded onto a Gaussian beam, and at least one modulated beam of helical fractional OAM (Optical Aspect-Oriented Motion) is generated through a spatial optical phase modulation module. After coaxial beam combining, the beam is emitted in free space and imaged onto the demodulation phase modulation module plane via an optical relay imaging system. A conjugate helical phase map is loaded to demodulate the target OAM, and the focusing optics module is adjusted to couple the peak of the target OAM beam into a single-mode fiber, while non-target OAM beams are isolated. After verifying the demodulation isolation, the demodulation phase map is switched to sequentially recover each data stream. This invention achieves hybrid multiplexing of helical fractional and integer OAM, and achieves a mode isolation of ≥5dB through a dual isolation mechanism of phase conjugate demodulation and spatial optimal focusing. This improves fiber coupling efficiency and communication link robustness, significantly expanding the channel capacity and spectral efficiency of free-space optical communication.

The invention discloses a miniaturized double-ridge waveguide array antenna system, a microwave energy dynamic focusing method and a storage medium. The miniaturized double-ridge waveguide antenna unit comprises a metal waveguide cavity; the double-ridge structure is arranged in the waveguide cavity; and the de-ionized water medium is filled in the waveguide cavity, so that the volume of the 915MHz antenna unit is reduced by 87%. A plurality of the miniaturized waveguide antenna units; the support is used for fixing the plurality of antenna units, and the plurality of antenna units are arranged on the support in a hemispherical conformal and staggered circular topological structure to form an array; the microwave energy dynamic focusing method using the array antenna system comprises the following steps: determining a target position; based on a phase conjugation principle, excitation phases and amplitudes required by all antenna units in the array are calculated; and driving each antenna unit to emit electromagnetic waves with corresponding phases and amplitudes according to a calculation result, so that the electromagnetic waves are coherently superposed at the target position to form an energy focusing hot spot.

A method for phase-conjugate target emulation for testing a DSB FMCW radar includes selecting a proxy transponder from an array of frequency-shifting transponders to transmit an emulated target radar signal to a radar DUT. The proxy transponder is located at a mirror image location with respect to a desired DoA of a signal from an emulated radar target. The method further includes receiving a radar signal from the radar DUT and generating an output signal to be transmitted by the proxy transponder to the radar DUT by swapping roles of a normal sideband component and a ghost sideband component of the output signal such that the ghost sideband component appears to the radar DUT as a desired emulant and the normal sideband component appears to the radar DUT an undesired ghost sideband component. The method further includes transmitting the output signal to the radar DUT.

The invention relates to the technical field of optical scattering focusing, in particular to a method for regulating and controlling a back focus of a scattering medium by a positive and negative retina-like transmission matrix, which comprises the following steps of: modulating light wavefront on a spatial light modulator (4), collecting intensity speckles by a receiving end (13) after the modulated light passes through the scattering medium (9), firstly, a complex transmission matrix T of a scattering medium is solved based on a forward or inverse retina-like Hadamard modulation basis in combination with a common-path self-reference method, and then an optimized wavefront pattern loaded on the spatial light modulator (4) is solved based on the complex transmission matrix T and a phase conjugation algorithm. The feasibility of the method for regulating and controlling the back focus of the scattering medium by using the positive and negative retina transmission matrixes is proposed and verified for the first time.

An optical network system includes an optical repeater and a control device controlling the optical repeater. The control device: manages wavelength information of optical signals transmitted and received by the optical repeater in a path of the optical network and transmission line information of optical transmission lines connected to the optical repeater; determines a chromatic dispersion compensation amount for compensation in the optical repeater based on the wavelength information and the transmission line information; and determines phase conjugation processing in the optical repeater based on the wavelength information and the transmission line information. The optical repeater: acquires the chromatic dispersion compensation amount and phase conjugation processing information from the control device; performs chromatic dispersion compensation processing on an electrical signal based on the chromatic dispersion compensation amount; and performs phase conjugation processing on an electrical signal based on the phase conjugation processing information.

The application discloses a kind of modular hydraulic system test system and method, it is related to hydraulic test technical field, comprising the following steps: S1, using nanosecond level synchronous time scale system to the outlet pulsating pressure signal of high-pressure plunger pump and low-pressure vane pump is collected, generates phase residual diagram, and preliminary determination is carried out to implicit resonance risk by frequency drift and amplitude gradient calculation;S2, on the basis of synchronously collected baseline, to pulsating pressure sequence is carried out to mutual spectrum coherence degree calculation and phase difference time series analysis, identifies frequency misplacement anchor point, and generates pump source pulsating interference fingerprint, determines the time window of implicit resonance.The application is through nanosecond level synchronous collection, phase conjugate inversion and misfrequency traction strategy, realizes to the real-time identification, dynamic intervention and closed-loop control of implicit resonance in hydraulic system, effectively avoids the energy coupling caused by frequency misplacement, improves system operation stability and security, prolongs equipment service life.

An observation apparatus includes a light source, a mirror, a condenser lens, an objective lens, a beam splitter, an imaging unit, and an analysis unit. The analysis unit includes an interference intensity image acquisition unit, a first complex amplitude image generation unit, a second complex amplitude image generation unit, a phase conjugate operation unit, a two-dimensional phase image generation unit, a three-dimensional phase image generation unit, and a refractive index distribution calculation unit. The analysis unit irradiates an observation object with light along each of a plurality of light irradiation directions by changing an orientation of a reflection surface of the mirror, acquires an interference intensity image at a reference position for each of the plurality of light irradiation directions from the imaging unit, and performs necessary processing based on the interference intensity images to obtain a three-dimensional phase image of the observation object.

The application discloses a light weapon shooting training intelligent shooting range data processing method and system, relates to the technical field of shooting range data processing, and comprises the following steps: constructing a nanosecond unified time baseline, synchronously collecting multi-source sensing signals of a shooting training shooting range by using a high-resolution optical array and an acoustic sensing matrix, performing time synchronization and delay compensation on each sensing signal through a phase alignment mechanism, and forming a unified sensing base surface for multi-target identification. The application realizes high-precision synchronous collection and interference feature stripping by constructing a nanosecond unified time baseline and fusing multi-source sensing, significantly improves target differentiation and identification accuracy in a complex background, simultaneously generates a dynamic reliability atlas and implements phase conjugate regulation in combination with a time-space coupling identification and counterfactual playback mechanism, forms an identification and correction closed loop, effectively reduces misjudgment and drift, and ensures stable tracking and continuous identification in a multi-target scene.

The application discloses a correction method and system for industrial close-range photogrammetry images, and relates to the technical field of computer vision, comprising: S100, constructing a cross-time baseline of light path observation under multi-time sampling conditions, performing joint extraction operation of brightness distribution and phase gradient on each frame of image, generating an anchor point sequence, and constructing an interference risk atlas according to the change trend of optical path difference, which is used as a dynamic constraint basis for feature recognition; S200, performing phase polarization consistency audit based on the anchor point sequence and the interference risk atlas, performing pixel-by-pixel tracking on the phase mutation area in the brightness field, extracting interference false peaks with phase inversion characteristics, and outputting a false edge candidate data set. The application constructs time anchor points and interference atlases, realizes interference perception and early warning, extracts real edges by combining phase audit and optical flow registration, reconstructs imaging geometry and optimizes distortion, suppresses interference by combining phase conjugation and time rearrangement, and realizes closed-loop control and high-precision image correction.

The present application relates to the technical field of optical element surface physical property testing, and discloses a structured light testing system for optical element surface patterns, which comprises: a pair of phase conjugate structured light fields for alternately illuminating the optical element, synchronous acquisition of Fourier domain diffraction patterns and spatial domain in-situ light field intensity distribution, and calculation of a differential signal to determine a defect position after correction of the diffraction patterns by the in-situ light field intensity distribution. The present application presets a common mode signal cancellation mechanism for defect-free periodic patterns at the physical layer level through conjugate illumination and differential processing, thereby suppressing a large amount of redundant information and retaining and highlighting only the asymmetric scattering signal caused by defects, which makes the focus of detection shift from the accuracy of measuring geometric morphology to the uniformity of distinguishing the physical properties of material optical response, and realizes high signal-to-noise ratio rapid discrimination of functional defects.