59 results about "Angular scan" patented technology

The invention discloses a PVC film coating uniformity detection method based on spectral analysis, and relates to the technical field of optical detection, and the method comprises the following steps: S001, adopting a controllable incident illumination system with a multi-angle rotation function to carry out continuous angle scanning on the surface of a PVC film, collecting reflection spectrum intensity data in a corresponding wave band range according to different incident angles, and generating a spectrum data matrix containing interference characteristics; and S002, carrying out continuous wavelet transform processing on the spectral data matrix, carrying out multi-scale local decomposition on a spectral response signal, extracting and separating a periodic interference characteristic signal, and obtaining a purified spectral matrix after interference reduction. According to the method, through multi-angle spectrum collection and interference feature stripping, accurate identification of a coating thickness abnormal area and combination of strength indexes, spraying parameters are regulated and controlled, a detection-compensation-reinspection closed-loop mechanism is constructed, interference misjudgment is effectively avoided, and the accuracy and regulation and control efficiency of uniformity detection of the PVC film coating are improved.

The invention discloses an industrial part surface defect intelligent detection system and method, and relates to the technical field of defect detection. When a part is fixed on a rotating carrier for full-angle scanning, a surrounding type industrial camera and a light source array cooperate, a light field is dynamically evaluated by combining part curved surface reflection characteristics, and the light source intensity and direction and camera exposure and gain are adjusted; obtaining a uniform initial image; a global image of the part is reconstructed through brightness standardization, denoising interference suppression, multi-scale texture enhancement, distortion correction, normal expansion and cross-view alignment splicing; the method comprises the following steps: extracting cross-scale features by adopting a graph convolution attention model, constructing a fusion feature vector based on geometric morphology parameters and texture features by virtue of defect regions segmented by regional reconstruction aggregation curved surface reflection to finish classification and grading, generating a simulated graph through an adversarial generative network, comparing and verifying, and outputting a detection report. The defect detection precision and efficiency are effectively improved, and the industrial high-quality detection requirement is met.

The present application relates to the technical field of ultrasonic nondestructive testing and industrial pipeline safety evaluation, in particular to a kind of stainless steel pipeline weld internal defect detection system, comprising: obtaining ultrasonic multi-angle scanning data, extracting waveform features and sound path information;Anisotropic propagation model is constructed, and sound beam deflection correction factor is solved;Generate corrected sound field spatial distribution data;Calculate the multi-view spatial coherence coefficient representing the consistency of signal phase under different sound beam paths;If the multi-view spatial coherence coefficient is greater than the coherence threshold, then determine that the corresponding signal is a defect echo, and reconstruct the defect spatial morphology;Otherwise, it is determined that the corresponding signal is structural scattering noise, and noise suppression processing is performed;Output the quality detection report of target component;The present application solves the missed detection hidden danger caused by geometric constraint and material attenuation, and ensures that the detection result of nuclear power and petrochemical high-risk pipeline under complex physical conditions meets the stringent full-coverage quality standard.

The invention relates to a simulation scanning method for guiding the routing angle of adjacent layers, and the method comprises the steps: building a transmission line model containing two pairs of differential lines with the vertical projections of the adjacent layers coinciding, setting a center coordinate, controlling the two pairs of differential lines to rotate reversely at the same value, scanning the angle, obtaining crosstalk data of different angles through simulation, and improving the amplitude. Therefore, the wiring angle design of adjacent layers is guided. According to the method, two pairs of differential lines of adjacent layers are set as reverse same-value rotation variables, the angle difference and a single variable are associated, control is simplified, and traceability is achieved; a projection center is used as a rotation reference, so that accurate control and reliable simulation are guaranteed; crosstalk data are obtained through angle scanning, quantization limitation is broken through, and efficiency is improved; the data shows that the difference is improved, the optimal angle is selected by combining the assistance with the space limitation, crosstalk exceeding or space waste is avoided, and experience dependence is got rid of.

The invention discloses a laminated scanning imaging system and an imaging algorithm based on inclined illumination multi-angle rotation fusion, and relates to the technical field of computational optical imaging. A sample is obliquely illuminated and scanned through a coherent light source, and a series of diffraction information of the sample to be detected in the illumination direction is obtained; and then rotating the angle of the sample to change the illumination direction, repeating the steps to obtain a series of diffraction information at multiple angles, and based on the diffraction information at multiple angles, performing reconstruction through an iterative algorithm to obtain a complex amplitude image of the to-be-detected sample. According to the invention, by means of inclined illumination and sample rotation, multi-angle diffraction information of the sample to be measured is fused in an algorithm, and a high-resolution reconstruction result is obtained. Meanwhile, the technology does not require height superposition of scanning positions at different angles, and has very strong experimental feasibility.

The application provides a dual-polarized planar tightly coupled array antenna, wherein the antenna unit comprises a metasurface matching layer, a radiator and a metal floor, the upper surface of a radiation plate in the radiator is provided with a cross-shaped boss fixed with the metasurface matching layer, and the metal floor is fixed with a metal wall composed of two cross metal plates, the upper end of the metal wall penetrates through the radiation plate and is connected with the metasurface matching layer, and the antenna works through exciting the connecting slot gap formed between adjacent radiators. The gap formed by the cross-shaped boss and the upper end of the metal wall can be equivalent to a capacitive load to offset the inductance generated at low frequency, the metal wall can break the original loop mode resonance, the radiation plate avoids the introduction of common mode resonance, the bandwidth at low frequency is widened, meanwhile, the metasurface matching layer can transform the impedance between the radiator and the free space, the impedance stability during wide-angle scanning of the antenna is improved, and the structure is simplified.

The application discloses a nonlinear calibration method and device of a magnetic encoder. The method comprises the following steps: setting multiple inflection points on an angle curve diagram formed based on an angle scanning result to divide an angle period into multiple angle curve segments, wherein each angle curve segment is approximately a first-order curve; acquiring a compensation coefficient of each angle curve segment; acquiring an angle output threshold value of each angle curve segment; and starting calibration after detecting a data valid signal, acquiring a target output angle after calibration based on the corresponding compensation coefficient and the angle output threshold value according to an input angle. The application divides a complete angle period into multiple angle curve segments by setting multiple inflection points, and each angle curve segment is approximately a first-order curve. Then, the slope of each angle curve segment is approximated to 1 through a compensation coefficient, and a target output angle compatible with an angle measurement value of an angle measuring instrument is obtained after calibration. The compensation algorithm is simplified, and resource consumption is reduced.

The present disclosure describes a system and a method for an ion implantation (IMP) process. The system includes an ion implanter configured to scan an ion beam over a target for a range of angles, a tilting mechanism configured to support and tilt the target, an ion-collecting device configured to collect a distribution and a number of ejected ions from the ion beam scan over the target, and a control unit configured to adjust a tilt angle based on a correction angle determined based on the distribution and number of ejected ions.

The present invention belongs to the technical field of angle locators for ablation biopsy needles. Disclosed is an angle locator for ablation biopsy needle puncture under CT guidance. During movement, a main gear at the outer end of a rotating rod drives a first driven gear and a second driven gear to perform linkage, so as to drive a right-hand threaded screw and a left-hand threaded screw to rotate; then during rotation, the right-hand threaded screw and the left-hand threaded screw push an abutting pad to extend outward for fixation, thereby realizing the fixation function during movement, and achieving a double-linkage function. The abutting pad also can be manually rotated to move outward and inward. By using an inner angle scanning member in cooperation with angle marking holes, the rotation angle of a biopsy needle angle adjustment member can be measured during rotation, thereby improving the rotation accuracy and also allowing quick focusing. Moreover, an alignment laser is used in cooperation with a biopsy needle placement slot, so that by correspondingly aligning the focus point of the alignment laser and the focus points of a fixed laser and a rotating laser, the function of independently adjusting a biopsy needle can be realized.

The invention discloses a contour parameter detection system and process for a silicon single crystal crude wafer, and the system comprises a holographic projection scanning module which generates a composite light beam by adopting a multi-wavelength laser beam combination technology, and relates to the technical field of semiconductor material detection. According to the contour parameter detection system and process of the silicon single crystal coarse wafer, all-directional and multi-angle scanning of the silicon single crystal coarse wafer can be realized through the holographic projection scanning module, the whole surface and subsurface area are covered, and the problem of limited detection range in the prior art is effectively solved; the conditions of missing detection of a key area and incomplete coverage of a core area are avoided, and meanwhile, the quantum sensing detection module has extremely high detection sensitivity based on quantum entanglement and quantum interference principles, and can sense tiny magnetic field, electric field and stress changes on the surface and in the silicon single crystal crude wafer, so that microdefects are accurately detected, and the detection accuracy is improved. The problem of insufficient microdefect detection sensitivity in the prior art is solved.

The invention belongs to the technical field of millimeter wave phased-array antennas, and particularly discloses a circularly polarized spherical phased-array antenna for Ka-band operation, which comprises a hemispherical antenna base and a plurality of radiation units, the plurality of radiation units are arranged on the hemispherical surface of the hemispherical antenna base in an array form; the circularly polarized spherical phased-array antenna is configured in a frequency range from 27GHz to 29GHz, so that + / -90-degree beam scanning of any azimuth tangent plane is realized. The scanning angle limitation of a planar array is broken through, and + / -90-degree continuous scanning of any tangent plane is realized; meanwhile, the array element spacing and the arrangement density are optimized in combination with the short wavelength characteristic of the Ka wave band, the mutual coupling effect of the high frequency band is reduced, and the problem that the actual use effect is poor due to the fact that the large-angle scanning radiation capacity of an existing Ka wave band planar phased array antenna is limited and the polarization purity is reduced is solved.

The invention provides a multi-antenna angle scanning and capturing method and related equipment, and relates to the technical field of wireless communication. The method comprises the following steps: receiving electromagnetic wave signals about a target sent by a plurality of antennas, and carrying out signal preprocessing to obtain multiple paths of baseband complex signals; performing angle scanning on the multiple paths of baseband complex signals by adopting a MUSIC algorithm to obtain an angle spectrum containing a plurality of spectrum peaks, and extracting a plurality of candidate angle values from the angle spectrum; determining a corresponding sector range around each candidate angle value, and executing tracking scanning on each sector range in parallel within a preset time to obtain a power metric value of each sector range; and performing time smoothing processing on the power metric value of each sector range to obtain a smooth power value of each sector range, and when a target sector range of which the smooth power value meets a preset condition exists, performing angle scanning in the target sector range to obtain a target angle value. By adopting the method, the real orientation of the target can be identified.

This utility model relates to the field of holographic cable defect detection technology, and more particularly to a multi-angle scanning holographic cable defect detector. Technical solution: A multi-angle scanning holographic cable defect detector includes a mounting base, a rotating shaft, a fixing block, a turntable, a detector, probes, and a control panel. A rotating shaft is rotatably connected to the upper part of the mounting base, a fixing block is fixedly connected to the rotating shaft, a turntable is rotatably connected to the top of the fixing block, a detector is fixedly connected to the left side of the turntable, probes are fixedly connected to both sides of the left side of the turntable, and a control panel is fixedly connected to the top of the turntable. This utility model uses a first motor to drive a screw rod to rotate, which in turn moves a rack and pinion, causing the detector's fixing block to rotate synchronously. This achieves precise adjustment of the vertical angle of the cable detector, ensuring comprehensive scanning of the cable from all angles and avoiding the problem of missing potential defects due to limited viewing angle.

The invention discloses a communication electromagnetic wave adjustable linear polarization-to-circular polarization spherical lens antenna, a manufacturing method thereof, a communication base station, a communication system and a communication method, and belongs to the technical field of electronic communication antennas. The antenna comprises a controllable polarization spherical lens and a linear polarization feed source. The feed source is used for emitting polarized electromagnetic waves of which the linear polarization direction and the main axis direction form an inclined angle to the sphere; the length of an axial baseband of the electromagnetic baseband unit is configured to be greater than that of a radial baseband, so that the electromagnetic wave refractive index in the main axis direction is greater than that in the radial direction; and when the feed source is located at the equator part of the moving track, the electromagnetic waves are emitted in a circular polarization manner after being regulated and controlled by the lens. When the feed source is located at the end part of the sphere of the moving track, the polarization direction of electromagnetic waves is not changed after passing through the lens; and when the feed source is located between the equator part and the end part of the sphere, the electromagnetic waves are emitted in an elliptical polarization manner after being regulated and controlled by the lens. And three functions of high-gain wide-angle scanning, broadband working and adjustable polarization state are realized.

The invention relates to the technical field of industrial nondestructive testing and precision measurement, in particular to a PCB back drilling hole stub length measuring method based on circumference computer layered imaging, which comprises the following steps: S1, acquiring RCL three-dimensional body data based on a circumference calculation layered imaging technology; s2, positioning a back drilling hole and determining an annular sampling area from the RCL three-dimensional body data; s3, carrying out gray scale statistics layer by layer in the annular sampling area along the thickness direction of the PCB, and generating a gray scale curve; s4, analyzing feature points of the curve, and determining a first feature position corresponding to a signal line layer and a second feature position corresponding to a stump tail end layer; and S5, according to the first feature position and the second feature position, the stub length of the back drilling hole is obtained through calculation. According to the method, the negative influence of aliasing artifacts generated by limited angle scanning on the measurement precision of the length of the stub of the back drilling hole is overcome, and high-precision, high-efficiency and non-destructive stub length measurement is realized.

The invention discloses a circularly polarized wide-beam scanning array unit, the bottom layer of the array unit is provided with a second layer of metal floor, the second layer of metal floor is provided with a feed structure and a radiation structure from bottom to top in sequence, and the peripheral surfaces of the feed structure and the radiation structure are coated with isolation structures. A sequentially rotating coupling feed strip line is clamped in the feed structure, a second layer of metasurface patch is adopted in the radiation structure, and a dielectric covering layer is arranged at the upper end of the radiation structure. The array antenna unit has the advantages of wide frequency band, large circular polarization scanning angle, simple structure, low profile and the like, is suitable for a single-side main plane broadband circular polarization large-angle scanning array antenna, and is particularly suitable for a mixed scanning type high-gain satellite communication ground terminal antenna; and the application in the aspects of a re-frequency selective surface, a polarization selective surface, an intelligent metasurface, a backtracking array and the like can be expanded.

The invention discloses a single-channel transmission CT (Computed Tomography) system, a data transmission system and a transmission method, and the system comprises a CT scanning system which comprises a single-slideway data transmission system; the scanning bracket comprises a slip ring and an image chain component; the image chain part comprises an X-ray tube, a high-voltage generator and a detector; the slip ring is connected with a CAN transceiver. The patient support is connected with the sliding ring in a matched mode; cAN communication or TRIG communication is flexibly switched in a multiplexing mode, a communication protocol is flexibly switched, information interaction of application software is facilitated, data collected by a detector is synchronized with information such as the angle of a rack and the position of a scanning bed in CT scanning, the precision of collected data is improved, a standard CAN network is compatible to the maximum degree, and real-time performance and flexibility are both considered.

This invention belongs to the field of defect detection, specifically a method and system for identifying defects in pipeline welds. The method includes: acquiring an initial X-ray image of the pipeline weld; extracting a global feature map using a first deep convolutional network; decoding to generate a defect prediction confidence map; extracting key geometric structures of the weld and constructing a geometric prior weight map; applying Bayesian variational inference to the network; statistically analyzing the dispersion of multiple random forward propagations to represent cognitive uncertainty and generate an uncertainty map; pixel-level weighted fusion of the confidence map, uncertainty map, and geometric prior weight map to obtain a probability heatmap; constructing a composite sampling guidance vector field based on this heatmap; deploying sampling points along the vector field; controlling the imaging system to scan and acquire high-resolution local projection data from multiple angles; three-dimensional reconstruction of the projection data to obtain local features; fusing these features with global features through a cross-attention module to generate an enhanced defect representation; and outputting the category, three-dimensional spatial location, and size of the weld defect.

The application discloses a dynamic terahertz beam deflector of a metal metasurface-liquid crystal-metal grating structure. The device comprises a first dielectric substrate layer, a metal metasurface layer, a liquid crystal layer, a metal grating layer and a second dielectric substrate layer. By composing a tunable photonic resonant cavity with the metal metasurface layer, the liquid crystal layer and the metal grating layer, enhanced in-cavity polarization mode conversion and dynamically controlled terahertz beam deflection can be realized. By changing the frequency of the incident light, the deflection angle of the outgoing light beam is scanned by 37.5-50°. When the frequency of the incident light is 0.69 THz and the deflection angle is 47.5°, a diffraction intensity of 50% and a high-intensity modulation depth of 99.6% are realized. The device has the advantages of flexible design, easy processing, low price, large modulation range and the like, and is conducive to integration and miniaturization. Therefore, the device can be used in terahertz spectrum, imaging, radar and communication systems and the like.

This invention relates to a multi-functional inspection device and its method of use for fully mechanized tunneling faces. It includes a mobile trolley and a robotic arm fixed to the trolley. A ring-shaped adjustment device is connected to the top of the robotic arm, and a spiderweb track is installed on the ring-shaped adjustment device. An inspection slider is installed on the spiderweb track, and several detection devices are installed on the inspection slider. This invention, through the use of the robotic arm and spiderweb track, enables the lifting and movement of existing detection devices to a suitable position, and the adjustment of the angle to align with the point to be inspected. It allows for close-range, multi-angle scanning or inspection, minimizing the technical problem of unclear images due to dust in underground environments, and enabling clear and accurate observation of detailed information at the desired observation location.

A refrigerator appliance is provided, including a dispenser assembly positioned at a door at a cabinet. The dispenser assembly includes a recess extending into the door. The dispenser assembly is configured to egress a fluid, ice, or both, toward the recess. A scanner assembly includes a scanner device and a targeting device. The scanner assembly is positioned at a casing disposing the scanner device and the targeting device at an angle toward the recess. The scanner assembly is positioned at the angle toward the recess and behind the external wall. A sound emitting device is positioned outside of the casing at which the scanner assembly is positioned. The sound emitting device is configured to selectively emit sounds based on a command signal from the scanner assembly. The sound emitting device is communicatively coupled to the scanner assembly.

The application relates to a wide-angle scanning millimeter wave array antenna structure, which comprises a plurality of antenna units arranged and connected at intervals, wherein the antenna unit comprises a first dielectric layer, a bonding layer and a second dielectric layer arranged in sequence from top to bottom, the top surface of the first dielectric layer is provided with a radiation patch layer, the second dielectric layer is provided with a coupling short circuit structure and a coupling feed structure which are symmetric about the center, and the antenna units are sequentially connected through anti-symmetrical neutral lines. Compared with the prior art, the coupling short circuit structure is adopted to reduce the vertical current component, thereby reducing the high cross-polarization component of the H plane, improving the radiation characteristics of the antenna unit; the coupling feed form is adopted to further reduce the size of the antenna unit, the spacing between the antenna units is reduced to reduce the sidelobe level when the beam is scanned to a large angle, and the wide-beam scanning capability of the array antenna is expanded; the asymmetric neutral line is used to improve the mutual coupling between the antenna units and reduce the mutual influence between the adjacent antenna units.

This invention relates to the field of shortwave antenna communication channel testing and modeling technology, specifically to a method for measuring the angular power spectrum of an antenna in a shortwave skywave scenario. The method includes: the receiver performing a two-dimensional equally spaced angular scan within a preset azimuth and elevation range; establishing an angular power spectrum measurement equation based on the received signal power, antenna pattern, and noise power channel, using the scattering function; convolving this equation with the pattern to obtain the angular power spectrum within a single path; discretizing the single-path received power matrix and antenna pattern matrix in two dimensions, and then performing zero-plugging expansion on each; converting the discretized single-path received power matrix and antenna pattern matrix into two-dimensional frequency domain matrices, and determining the frequency domain ratio between the received power matrix and the antenna pattern matrix mapped to the angular domain using time-delay Doppler domain parameters. This invention improves the accuracy of angular power spectrum measurement in shortwave skywave channels while reducing the dependence of traditional empirical modeling methods on a single propagation assumption.

The invention relates to a magnetic resonance multi-angle scanning auxiliary positioning device, belongs to the technical field of magnetic resonance examination auxiliary equipment, and solves one of the problems that in the prior art, left and right ankles are not universally turned inwards and outwards, the inwards and outwards turning angles are not accurate, the angle adjusting process is prone to being blocked, the operation process is tedious, or the adaptability is poor. The magnetic resonance multi-angle scanning auxiliary positioning device comprises a foot supporting part, a leg supporting part and an angle adjusting mechanism. The leg supporting part is a basic bearing part and is used for supporting legs of a patient; the angle adjusting mechanism is connected with the bottom of the leg supporting part, the foot supporting part is movably connected with the angle adjusting mechanism, and the angle adjusting mechanism is used for adjusting the angle of varus and valgus of the ankle. According to the device, inward and outward turning adaptation of the left and right ankles is achieved, the inward and outward turning angle is accurate, fixation is firm, the angle adjusting process is stable, the operation process is simple and convenient, and adaptability is good.

A tunable optical filter can include an input focusing optic, an output focusing optic, a linearly varying optical filter positioned at a back focal plane of the input focusing optic and a front focal plane of the output focusing optic, an input angular scanning component configured to receive an input beam positioned at a front focal plane of the input focusing optic, and an output angular scanning component positioned at a back focal plane of the output focusing optic. The input focusing optic can receive the input beam from the input angular scanning component and direct the input beam to the linearly varying optical filter, where a position of the input beam on the linearly varying optical filter can be selected based on an angle of the input angular scanning component. The output focusing optic can receive a filtered beam from the linearly varying optical filter and direct the filtered beam to the output angular scanning component.

The application provides a method for determining tube electrical parameters, a host computer and a medical imaging system. The method for determining tube electrical parameters comprises the following steps: acquiring projection data of an imaging device for scanning a target object at a first scanning angle; acquiring target noise data of the target object; determining current noise data of the projection data according to the projection data; and determining tube electrical parameters of the imaging device for scanning the target object at a second scanning angle according to the target noise data and the current noise data. The method provided by the application can select appropriate tube electrical parameters directly from the noise data estimated from the projection data without establishing a knowledge base in advance, improve the quality of the reconstructed image, reduce the radiation dose received by the patient, and play an important role in low-dose imaging of the medical imaging device.

The present application relates to the technical field of micro computer tomography, and discloses a large-aperture parabolic single glass tube micro-CT system and a reconstruction method thereof, the system comprising an X-ray source, a straight-through X-ray shutter, a first lens supported by a lens support to move, a sample supported by a sample stage and an X-ray flat panel detector arranged in sequence along an optical axis; the first lens is a large-aperture parabolic glass tube lens of millimeter level, and the lens support is used for adjusting the angle, pitch and optical axis coaxiality of the first lens; an electric control platform controller is electrically connected with the lens support and the sample stage respectively, and a main control computer controls the sample stage to perform angle scanning, sub-pixel angle jitter sampling and multi-view field splicing scanning through the electric control platform controller. The present application adopts a large-aperture parabolic glass tube lens of millimeter level, and the quasi-parallel beam geometry after system regulation and control enables the micro-CT system to be compatible with parallel beam algorithm, and the image reconstruction quality of the original cone beam algorithm is retained and improved.

This invention discloses a method for maintaining delay stability in an active phased array antenna, comprising two main parts: hardware design and software design. This invention effectively solves the system delay variation caused by angle scanning during electronic scanning of a phased array antenna. The hardware design mainly focuses on the topological structure design of the phased array antenna, enabling hardware implementation to support delay reference adjustment. The software design mainly involves the design of the antenna beam control algorithm, primarily used to adjust the delay reference based on different operating modes. This allows for antenna delay design tailored to different operational needs, ensuring no system delay jumps occur during antenna scanning. This invention enables a complete design process, resolving the problem of system delay jumps during the use of phased array antennas.

The utility model discloses an adjustable ankle fixator for nuclear magnetism, which comprises a bottom plate, an adjusting device and an ankle fixing device, the adjusting device comprises a first mounting plate, a second mounting plate, a first adjusting component, a mounting frame and a second adjusting component, and the first mounting plate and the second mounting plate are respectively arranged at two ends of the bottom plate in a fixed manner; the first adjusting assembly is movably arranged on the first mounting plate; the mounting frame is movably arranged on the first adjusting assembly; and the second adjusting assembly is movably arranged on the second mounting plate. Therefore, through the design of the adjusting device and the ankle fixing device, the ankle is well fixed and flexibly adjusted, movement of a patient during examination is reduced, the components are made of non-paramagnetic materials, the magnetic field uniformity is prevented from being affected, normal scanning is guaranteed, the image quality is improved, the ankle fixator can be attached to the ankle joint to assist scanning at various angles, and the ankle fixing device is convenient to use. And the device is suitable for different coils and can meet various clinical requirements.

The invention discloses a multi-angle scanning and curved surface unfolding weld defect detection method, system and device, and the method comprises the steps: controlling each group of triangular laser contour sensors to scan a weld region of a target welding object, and obtaining a multi-view weld point cloud; point cloud fusion processing is carried out on the multi-view welding seam point cloud to obtain a three-dimensional surface point cloud of the welding seam area; performing curved surface expansion processing on the three-dimensional surface point cloud to obtain a two-dimensional expansion graph; performing fusion processing on the three-dimensional surface point cloud and the two-dimensional expansion graph according to a preset fusion algorithm to obtain a fused image; and inputting the fused image into a preset defect detection model to obtain a defect detection result. According to the method, the multi-view weld point cloud of the weld area is obtained, the problems that data are incomplete and detection blind areas are prone to occurring are avoided, curved surface expansion is conducted on the three-dimensional surface point cloud to obtain the two-dimensional expansion view, then the three-dimensional surface point cloud and the two-dimensional expansion view are fused, and the geometric feature utilization rate of the two-dimensional expansion view to the three-dimensional surface point cloud can be increased.