517 results about "Isotropy" patented technology

The invention provides a magnetic resonance image self-supervision super-resolution reconstruction method and system based on a prior guide diffusion model. The method comprises the steps of image preprocessing, pseudo-pairing data set construction, prior condition construction, model training, model testing and three-dimensional isotropic volume reconstruction. According to the method, the dependence on a real high-resolution image is remarkably reduced by constructing a self-supervised pseudo-pairing mechanism, and high-quality reconstruction from anisotropic MRI to an isotropic image is realized; meanwhile, by introducing multiple medical priori including high-frequency residual, edge structure and region-of-interest guidance, detail retention and structural boundary definition of the image are effectively improved, the convergence speed and robustness of the model are improved while anatomical fidelity is guaranteed, and the method is suitable for large-scale popularization and application. And a technically feasible and clinically applicable solution is provided for high-resolution reconstruction of medical images.

The invention relates to a glioma radiotherapy effect prediction method based on habitat analysis imageomics, and belongs to the technical field of medical image artificial intelligence and tumor radiotherapy, and the method comprises the steps: collecting a multi-mode MRI image, a radiotherapy plan computed tomography CT image, a dose image and a local recurrence label before postoperative radiotherapy, and converting the images into a standard format; sequentially performing craniocerebral boning processing, N4 bias field correction, isotropic resampling, gray level normalization processing and image registration on the acquired image to obtain a preprocessed image; based on the planned target volume PTV, dividing the interior of the PTV into three types of physiological structure habitat areas and three types of physiological habitat areas; image omics features of the multi-mode MRI images are extracted in the PTV and all habitat areas, and an optimal feature subset is screened out; taking the screened optimal feature subset as an input, taking the local recurrence label as an output label, and selecting an optimal model; and generating an output result by using the optimal model.

The invention belongs to the technical field of computer vision and three-dimensional point cloud processing. The invention provides an anisotropic point cloud convolution method based on local geometric self-adaption. According to the embodiment of the invention, the principal component analysis is carried out on the neighborhood point cloud to estimate the principal direction of the local geometric structure, and the affine transformation matrix is constructed; and performing dynamic deformation on the basic kernel point of the convolution operator by using the matrix, so that the shape and the direction of the convolution kernel are dynamically aligned with the local structure of the point cloud. The convolution operator is integrated into a point cloud registration network, and can be used for feature extraction of three-dimensional point clouds, especially underwater multi-beam depth finder point clouds. The convolution operator constructed by the method can effectively capture the structure priori of the strong anisotropic point cloud, and solves the problems of structure information loss and limited feature extraction capability caused by the isotropic kernel processing the data.

The invention discloses an automobile manufacturing part surface defect tracing and positioning detection system, and belongs to the technical field of industrial defect detection. Comprising an isotropic scattering reference point module, the surface of which is provided with a specific micron-sized three-dimensional geometric structure; the multi-view synchronous acquisition module is deployed in the circumferential direction of an automobile part detection station, comprises at least three industrial cameras which are arranged in an elevation angle difference manner, and acquires a multi-angle original image with a reference point through a synchronous triggering acquisition device; the scattering feature intelligent positioning module is in signal connection with the multi-view synchronous acquisition module; the dynamic calibration compensation module is used for receiving the initial registration result output by the multi-view geometric resolving unit and correcting a scattering compensation coefficient of the reference point in a high-curvature area in real time according to curved surface curvature distribution; and outputting the corrected high-precision three-dimensional reconstruction data. Through a refraction compensation formula, material optical parameters and geometric curvature are fused, and positioning error multiple compression is achieved in high-distortion areas such as vehicle door ridges.

The invention relates to the technical field of unconventional shale oil and gas resource exploration, in particular to a shale shear wave velocity estimation method considering clay directional arrangement influence. According to the technical scheme, a shale compaction model is constructed, a shale directional arrangement background medium is formed, an orientation distribution function is used for simulating the elastic tensor of the background medium under different directional arrangement degrees, and the anisotropic speed of the background medium is calculated; calculating a longitudinal wave speed and a transverse wave speed in an equivalent isotropic background medium according to the anisotropic speed, and then calculating a bulk modulus and a shear modulus of the equivalent isotropic background medium; and adding clay-related pores and sand-related pores into an equivalent isotropic rock matrix by using an Xu-White model to obtain a bulk modulus and a shear modulus of dry shale, and finally simulating the shear wave velocity of the shale under the influence of directional arrangement of the clay. According to the invention, a new rock physical model is established to simulate the influence of clay directional arrangement, pore morphology, mineral and fluid properties on longitudinal and transverse wave velocities in shale.

The invention discloses a dielectric metasurface optical edge detection device and method based on dual-polarization-state Mie resonance, the method shows a non-local dielectric metasurface which is high in robustness and easy to prepare, and the device can achieve polarization-independent edge detection with excellent efficiency and high numerical aperture (NA). By simultaneously utilizing Mie resonance in the s polarization state and the p polarization state, isotropic two-dimensional second-order differential operation under any polarization condition (including non-polarization illumination) is realized. According to the design scheme, real-time image edge extraction can be achieved, the average peak efficiency reaches 30%, the working bandwidth of 40 nm is achieved at the center wavelength of 1064 nm, and high-quality edge detection can be kept under the numerical aperture of 0.5. The work provides a new method for realizing polarization-independent edge detection, and paves a way for practical application of an optical calculation and imaging system.

The invention provides a manufacturing method of a sigma trench and a semiconductor device thereof, and the manufacturing method of the sigma trench comprises the steps: providing a substrate, forming a gate structure on the substrate, and forming source and drain regions in the substrate at two sides of the gate structure; anisotropic dry etching is carried out, and a first groove is formed in the source drain region; performing an isotropic chemical reaction, raising the temperature after the reaction is finished to sublimate a reaction product, forming a second groove in the first groove, enabling the top of the side wall of the second groove to be located at the bottom of the gate structure, and forming an undercut at the bottom of the gate structure; and performing wet etching, and forming a sigma groove in the second groove. According to the Sigma trench formed by the three steps of anisotropic dry etching, isotropic chemical reaction and wet etching, the top of the side wall of the Sigma trench is located at the bottom of the gate structure, and the undercut is formed at the bottom of the gate structure, so that the linear distance between the source region and the drain region is shortened, the resistance is reduced, and the performance of the device is improved.

The invention discloses a near-surface anisotropic first-motion wave tomography inversion modeling method and related equipment, and provides a near-surface model which better conforms to actual geological conditions for pre-stack depth migration from theoretical assumption and actual inversion results which are closer to the actual geological conditions and the propagation law of seismic waves. At present, isotropic static correction and undulating surface pre-stack depth migration are promoted to anisotropic undulating surface pre-stack depth migration, the seismic data imaging quality of a double-complex exploration area is improved, the method is also a huge technical progress, the method is used for undulating surface pre-stack depth migration, a better imaging effect is achieved compared with the prior art, and the seismic data imaging quality of the double-complex exploration area is improved. According to the method, the characteristics that the signal-to-noise ratio of the first-motion waves is high and all the first-motion waves are propagated in the near-surface are utilized, the near-surface anisotropy is considered, and the accuracy and the imaging quality of the imaging position of depth migration are improved.

The disclosed and claimed subject matter relates to (1) a process for performing thermal atomic layer etching (ALE) of films that include ZrO2, HfO2, (Hf—Zr)O2 alloy or similar materials which does not require the use of plasmas or corrosive halogenating chemistries and (2) a metal-insulator-metal capacitor (MIMcap) with unique properties enabled by a unique dielectric processing method.

The invention discloses a method and device for measuring the center frequency of an ultrasonic longitudinal wave probe, and belongs to the technical field of ultrasonic detection. The method comprises the specific steps that an isotropic metal test block containing a specific flat-bottomed hole and a transverse through hole is manufactured, and the flat-bottomed hole and the transverse through hole are both located in a probe far-field region; by measuring the echo height (Hf) and time (tf) of a flat-bottom hole and the echo height (Hs) of a transverse through hole and combining the positions and sizes of the flat-bottom hole and the transverse through hole, the center frequency (f) of the probe is calculated based on a formula. According to the method, the sound field characteristic difference of the double reflectors is creatively used for counteracting the machining precision interference, the operation process is simplified, and the problems that a traditional method is high in equipment cost, complex in operation and limited in applicability are solved. The test block also supports multi-material adaptation (steel, aluminum, titanium alloy and the like) and is suitable for industrial sites and laboratory environments, and the detection efficiency and economical efficiency are remarkably improved.

The invention provides a filter film, an optical waveguide and a display device, the filter film comprises at least one layer of first film and at least one layer of second film, the optical property of the first film is isotropic, the optical property of the second film is anisotropic, and the second film and the first film are sequentially and alternately stacked; wherein the second thin film is prepared from a target anisotropic material, and the optical axis inclination angle of the target anisotropic material is within a target inclination angle range, so that the transmittance of the filter film to the incident light is changed along with the change of the incident angle of the incident light; the optical axis inclination angle is an included angle between the optical axis of the target anisotropic material and the film surface. The light filtering film provided by the invention has relatively low transmittance for light incident at a large angle, so that the light incident at the large angle is difficult to penetrate through the light filtering film, and the light incident to the light filtering film at the large angle is difficult to form rainbow lines.

The invention discloses a three-dimensional anisotropic grid generation method based on a streamline tracking topological structure, and relates to the field of numerical simulation of fluid mechanics, and the method comprises the steps: S1, carrying out the tetrahedral subdivision processing of a computational domain of an aircraft through employing a triangulation algorithm Delaunay, and achieving the isotropic grid subdivision of the computational domain; s2, using isotropic grid point information generated in the isotropic topological structure to construct a corresponding sign distance SDF resolving model so as to obtain a scalar field satisfying a Laplace equation; s3, calculating the gradient of the scalar field by adopting an SDF gradient solving method based on local least square fitting to obtain a corresponding gradient field; s4, performing streamline tracking in the gradient field to obtain a corresponding grid topological structure; and S5, constructing a structured hexahedral mesh covering the whole computational domain according to the mesh topological structure and the corresponding surface mesh. According to the method, theoretical unification and engineering feasibility of two-dimensional to three-dimensional grid structure mapping are realized.

A method for assisting in the performance of a surgical procedure on a patient is disclosed. The method includes receiving an intra-operative CT scan image, generating a three-dimensional isotropic scaffold based on the intra-operative CT scan image, fusing one or more images with the three-dimensional isotropic scaffold to form a three-dimensional model of a portion of the body of the patient, receiving information regarding the surgical procedure, determining obstacles in the path of the surgical procedure, and determining possible trajectories for the surgical procedure. The received information includes information regarding a surgical target to be operated upon, a region of access on the skin of the patient, and a surgical instrument to be used during the surgical procedure.

The invention belongs to the technical field of metal material production, and relates to a 500MPa-grade ship plate with excellent isotropic performance and a manufacturing method, and the ship plate comprises the following components in percentage by weight: 0.030%-0.080% of C, 0.050%-0.200% of Si, 0.70%-1.20% of Mn, less than or equal to 0.005% of P, less than or equal to 0.003% of S, 0.040%-0.090% of Nb, 0.080%-0.180% of V, 0.0250%-0.0300% of N, 0.20%-0.50% of Cu, 0.30%-1.00% of Ni, 0.006%-0.025% of Ti, 0.015%-0.040% of Als, 0.0100%-0.0800% of La, and the balance of Fe and inevitable impurities. The method has the advantage that the performance isotropy of the steel plate is improved.

The invention focuses on optimization of process parameters of titanium alloy, mainly aims at solving the problems of poor interlayer bonding degree, incomplete fusion, more pores and the like caused by titanium alloy additive manufacturing under certain parameters, provides a research method for process parameters of titanium alloy laser additive manufacturing, and relates to the field of laser additive manufacturing. According to the method, parameter optimization logic is determined, and a unique optimization path of titanium alloy additive manufacturing is provided by combining grain morphology, defect distribution and mechanical properties. The analysis method mainly comprises optical microscope metallographic analysis and mechanical property testing, the structure observation precision is improved, and the isotropy of the titanium alloy additive part is evaluated by testing the tensile strength, the yield strength and the ductility. The interlayer bonding problem of titanium alloy additive manufacturing is solved in a targeted mode. The method is suitable for the manufacturing field of aerospace, medical implants and high-corrosion-resistance parts, and the comprehensive performance and isotropy of additive manufacturing components are improved.

The invention relates to the technical field of industrial visual inspection, in particular to a 3D (three-dimensional) gluing glue type defect detection method based on three-dimensional measurement, which comprises the following steps: firstly, acquiring a point cloud by using three-dimensional measurement equipment, carrying out manifold pretreatment, constructing a substrate plane by fitting substrate data, and separating the point cloud of a glue strip based on the plane; secondly, extracting a geometric skeleton, searching a physical extreme point by using an isotropic spherical neighborhood, and decoupling the dependency of feature extraction and a slice direction; calculating a path differential attribute and an offset vector relative to a substrate plane, constructing a dimensionless centrifugal deformation index, and correcting a geometric tangent vector according to the dimensionless centrifugal deformation index to generate an anisotropic slice normal vector; and finally, obtaining a dynamic section based on the corrected normal vector, and quantifying defects by utilizing curvature mutation characteristics. According to the method, the geometric frame is corrected by constructing the dimensionless physical field, so that the section projection error caused by centrifugal force and gravity is effectively eliminated, and the detection precision of complex track 3D coating is remarkably improved.

The disclosure concerns a 3D printhead, a radiation emission device, and processes for additive fabrication and extrusion. The printhead comprises a radiating plate configured to transmit a thermal energy to the printing material deposited on a surface. A radiation emission device may be attached to an additive fabrication or extrusion device and comprising a radiating plate and a heating element. Additive fabrication and extrusion processes using a radiation for heating a surface for deposition of the material. Characteristics of products thus produced, such as porosity rate, warping, isotropy, maximum stress, internal stress, impact resistance, bending resistance, deformation at break, rigidity modulus, crystallinity rate, and impermeability are improved.

The invention relates to an aperiodic disturbance control vibration grid turbulence generation device, which comprises a vibration grid device and a flow field observation device, and is characterized in that the vibration grid device comprises a water tank frame, a water tank, a linear slide rail, a linear module, a vibration grid, a motor and a control system PLC module; the flow field observation device comprises an optical platform, an auxiliary LED lamp and a particle image velocity measurement system, wherein the particle image velocity measurement system comprises a high-speed camera, a laser and a computer. According to the invention, isotropic turbulence in a complex mode can be simulated, and the application range of equipment is expanded. According to the invention, the limitation of a vibration grating device based on periodic disturbance control is overcome, and a more flexible experiment platform is provided for turbulence mechanism research and application of the turbulence mechanism in the fields of material transportation, diffusion, sedimentation, flocculation and the like.

The invention relates to a single-objective isotropic three-dimensional super-resolution imaging method, which comprises the following steps of: outputting a linear polarization excitation light beam through a picosecond pulse laser, and outputting a linear polarization loss light beam through a nanosecond pulse laser, adjusting the polarization direction and power of the excitation light beam and the loss light beam by using a half-wave plate and a polarization beam splitter, enabling the loss light beam to enter a spatial light modulator, modulating a light field by loading a preset phase diagram, generating three focuses with different topological charges, axial positions and energy distribution, and outputting the three focuses. The high-order vortex phase retarder is used for carrying out polarization state modulation on the focus and separating loss light beams with different polarization components, the imaging resolution ratio smaller than 100 nm in the transverse direction and the axial direction is achieved, the transverse resolution ratio is similar to the axial resolution ratio, the three-dimensional real structure of an object can be accurately reflected when three-dimensional super-resolution imaging is carried out, and the imaging precision is improved. The imaging resolution is in direct proportion to the loss light intensity, and the higher the loss light intensity is, the higher the three-dimensional imaging resolution is.

The invention relates to an isotropic thermal neutron radiation field angle distribution uniformity control device and method, and the device is characterized in that a particle accelerator is used for emitting a high-energy charged particle beam with a beam position; the beryllium target is placed along the emission line of the high-energy charged particle beam, and the high-energy charged particle beam bombards the beryllium target to generate charges; the insulation isolation gasket is wound on the outer side of the beryllium target and prevents the charges from being led out from the outside through the beryllium target; and the adjusting assembly is connected with the beryllium target and used for acquiring the electric charge quantity on the beryllium target, and is connected with the particle accelerator and used for adjusting the angle of the high-energy charged particle beam irradiating to the beryllium target. According to the invention, the purposes of preventing the charges from being exported outwards based on the insulation isolation gasket and obtaining the charge quantity by the adjusting assembly to adjust the particle accelerator are achieved, so that after the insulation isolation gasket with low cost is used for isolation, the charge quantity is detected to adjust the particle accelerator, and the technical effect of effectively saving the cost is achieved.

The invention belongs to the technical field of polarization optics, and particularly relates to a metasurface and a polarization aberration compensation method based on refraction-metasurface hybrid design, and the method comprises the steps: S1, obtaining a to-be-compensated optical system; s2, performing parameter scanning on the metasurface; s3, obtaining a target phase of the metasurface; s4, obtaining two-direction attenuation and phase delay distribution of the polarization aberration at the exit pupil of the optical system to be compensated; s5, enabling the polarization aberration compensation function to carry out bidirectional attenuation compensation and phase delay compensation on the optical system to be compensated; s6, judging whether the bidirectional attenuation compensation result and the phase delay compensation result meet respective preset values or not; s7, analyzing wavefront phase distribution introduced by the anisotropic unit structure; and S8, enabling the sum of the phase of the isotropic unit structure and the phase of the anisotropic unit structure to be equal to the target phase of the metasurface. The invention provides an optical system polarization aberration compensation method with high applicability and high degree of freedom.

The invention discloses a preparation method of a high-aspect-ratio glass through hole and the glass through hole. The preparation method comprises the following steps: forming a photoresist mask on the surface of a substrate; performing a first etching step, performing isotropic first etching on the substrate by using plasma of a first gas from which charged particles are filtered, and forming a first polymer layer on the inner wall of the formed through hole and the photoresist mask for protection; performing a second etching step, performing anisotropic second etching on the first polymer layer on the bottom of the inner wall by using plasma of a second gas, exposing the substrate below, and performing the first etching again; after the first etching step for a first preset number of times is completed every time, performing a treatment process on the formed through hole; and repeatedly executing the first etching step, the second etching step and the treatment process until the through hole is formed in the substrate. The process can be simplified, the selection ratio can be improved, the efficiency can be improved, and better side wall smoothness can be realized.

A current sensor for detecting an electrical current in a line (LTG) comprises means for optical excitation and fluorescence analysis of non-magnetic centers (NV) or paramagnetic centers (NV) in isotropic sensor elements (SE1, SE2). Pump radiation (LB) with a specific wavelength and intensity is used to generate fluorescent radiation (FL), the intensity and time delay of which are measured relative to the pump radiation. The current sensor generates a magnetic field through the current flow, which floods the non-magnetic centers (NV) with different magnetic flux densities (B1, B2). The current value (ILTG) is determined from the detected fluorescence intensities and delays. A computing module (CTR) enables the evaluation, storage, transmission, or output of the data.

Source and drain formation techniques disclosed herein provide FinFETs with reduced channel resistance and reduced drain-induced barrier lowering. An exemplary three-step etch method for forming a source / drain recess in a source / drain region of a fin includes a first anisotropic etch, an isotropic etch, and a second anisotropic etch. The first anisotropic etch and the isotropic etch are tuned to define a location of a source / drain tip. A depth of the source / drain recess after the first anisotropic etch and the isotropic etch is less than a target depth. The second anisotropic etch is tuned to extend the depth of the source / drain recess to the target depth. The source / drain tip is near a top of the fin to reduce channel resistance while a bottom portion of the source / drain recess is spaced a distance from a gate footing that can minimize DIBL. The source / drain recess is filled with an epitaxial semiconductor material.

The application provides a design method of a bifocal self-correcting focal point scanning superlens, and belongs to the technical field of optical element manufacturing, and comprises the following steps: determining design parameters of the superlens; using a checkerboard strategy to reduce the design parameters of the superlens, and designing independent focal points in the superlens by means of rotating a single-layer super surface; using isotropy in an artificial atom library to establish a phase distribution library of the superlens; using a Jones matrix to optimize the phase distribution of the superlens according to the phase distribution library, and determining the spatial position of a focal point in a target unit structure; and according to the spatial position of the focal point in the target unit structure, a bifocal self-correcting focal point scanning superlens is designed through full-wave simulation and theoretical analysis verification. The superlens designed by the method can realize independent scanning of multiple focal points and multiple profiles, and provides a theoretical and practical application basis for the fields of industrial design, three-dimensional modeling, scanning and surface detection.

The invention belongs to the field of mechanical sensors, and discloses a full-plane six-dimensional force sensor. The sensor comprises a fixed table, a central loading table, eight radial beams and four circumferential beams which are arranged on the same central plane in the thickness direction, the radial beams are uniformly arranged between the central loading table and the fixed table at intervals along the circumferential direction; the radial beams which are symmetrical in pairs form a group of radial beams, two groups of radial beams which are perpendicular to each other are Fx-axis radial beams and Fy-axis radial beams respectively, and the other two groups of radial beams are Mz-axis radial beams and Fz-axis radial beams respectively; the four circumferential beams are matched with the four radial beams which are arranged at intervals one by one, and the circumferential beams are vertically and equally divided by the radial beams; the circumferential beams perpendicular to the Fx-axis radial beams are My-axis circumferential beams, and the circumferential beams perpendicular to the Fy-axis radial beams are Mx-axis circumferential beams; the strain gauges are divided into six groups, and each group of strain gauges form an independent full-bridge circuit. According to the invention, inter-dimensional crosstalk is eliminated from a mechanical structure, and the sensor has the advantages of high sensitivity, isotropy, strong overload capability and easy processing.

The invention belongs to the field of magnetic particle imaging, particularly relates to a three-dimensional magnetic particle imaging enhancement method and system based on distillation structure contrast learning, and aims to solve the problems of anisotropic resolution and background noise interference caused by sparse scanning tracks in three-dimensional magnetic particle imaging. The method comprises the following steps: constructing a data set; building a two-dimensional isotropic teacher network model and a three-dimensional resolution improvement student network model; training a two-dimensional isotropic teacher network model and storing model parameters; the three-dimensional resolution improvement student network model obtains model parameters and then carries out training, an obtained three-dimensional training result is converted into two-dimensional training input data, and the two-dimensional training input data is input into the two-dimensional isotropic teacher network model to generate a supervision benchmark which is used for updating and optimizing the three-dimensional resolution improvement student network model; and after training, carrying out resolution improvement processing on the input three-dimensional magnetic particle imaging image. According to the method, the isotropic resolution of the three-dimensional magnetic particle image is improved, and background noise is effectively suppressed.

The invention discloses an image-based suspension bridge surface anomaly measurement method and measurement system, and relates to the technical field of optical measurement and image processing. The method comprises the following steps: projecting a first polarization grating and a second polarization grating with mutually orthogonal polarization directions to a to-be-measured area of the suspension bridge in a time-sharing manner; polarization information of reflected light is collected by adopting a polarization state imaging unit, and corresponding first and second Moire phase diagrams are generated. The data processing unit further performs double-path parallel processing on the two Moire phase diagrams: on one hand, a two-dimensional inclined field representing the macroscopic contour of an object is solved through a joint solution algorithm; and on the other hand, through differential operation, microscopic optical anisotropy abnormal points caused by material stress, damage and the like are identified and positioned by utilizing symmetrical response of the optical isotropic surface to the orthogonal grating. The method realizes synchronous decoupling of geometric and physical characteristics from a single data source through one-time measurement, has the advantages of non-contact and high efficiency, and is suitable for precise detection of large-scale structures such as a suspension bridge and the like.

The present invention proposes an isotropic material plate impact positioning method based on a wavenumber domain response function, which belongs to the field of aircraft technology and solves the problems of low positioning accuracy and robustness of existing impact positioning methods. The steps include: calculating the dispersion curve of the guided wave according to the material properties and geometric dimensions of the detected part; selecting a preset frequency range, constructing a wavenumber-angle relationship function, and combining it with the frequency curve to obtain a frequency-angle function; constructing a wavenumber domain response function, and performing Fourier transform on the wavenumber domain response function to obtain a spatial domain response distribution function; mapping the pattern presented by the spatial domain response distribution function into an electrode of a piezoelectric crystal to obtain a directional sensor with a frequency component filtered according to direction; rigidly connecting several directional sensors to the detected part, outputting the 1dB bandwidth of the response signal, and constructing a fan-shaped area for each directional sensor, and using the intersection area of ​​all fan-shaped areas as the positioning result of the impact point.

The invention relates to the technical field of machining part non-ideal surface generation, and particularly discloses a wavelet and fractal-considered assembly junction surface construction method which comprises the following steps: S1, according to an ideal mathematical model of an assembly junction surface, S2, comparing calculation methods of different fractal parameters, S3, aiming at the part assembly junction surface in different machining modes, calculating fractal fractal parameters according to a calculation method of the different fractal parameters; s4, the assembly junction surface is regarded as a structure formed by superposition of contours of different scales, S5, a power spectrum analysis method is introduced to analyze the surface contour curve characteristics of the assembly junction surface, and S6, according to the isotropic or anisotropic properties of the surface of the assembly junction surface in different machining modes, the surface contour curve characteristics of the assembly junction surface are analyzed. The statistical distribution characteristic parameters determined in the step S3 are introduced into characterization of the assembly joint surface; and S7, the contour curve characteristic parameters extracted in the step S4 are associated with the fractal parameters determined in the step S2. According to the method, multi-scale decomposition is carried out on the assembly joint surface through wavelet transform, and the specificity information of the roughness contour, the waviness contour and the shape error contour can be effectively extracted.