183 results about "Angular scan" patented technology

The invention discloses a sparse finite angle CBCT reconstruction method and system based on residual diffusion and a storage medium, and the method comprises the steps: carrying out the CBCT sparse finite angle scanning of a to-be-detected target, and obtaining sparse projection data; fDK reconstruction is carried out on the sparse projection data to obtain an initial CBCT image; generating a first optimized CBCT image from the initial CBCT image through an image pre-training network; through the first optimized CBCT image and the sparse projection data, using the trained residual diffusion model to determine a residual image of the to-be-detected target; summing the first optimized CBCT image of the to-be-detected target and the residual image of the to-be-detected target to obtain a second optimized CBCT image of the to-be-detected target, and the second optimized CBCT image is a final CBCT reconstruction image. According to the method, the problems of stripe artifacts and low-contrast tissue annihilation under limited angle scanning are solved, the large-view CBCT reconstruction resolution is improved, and the radiation dose is reduced.

The invention provides a multi-target automatic tracking method and system based on an unmanned intelligent turntable. According to the method, electromagnetic echoes and environment depth data are synchronously collected through a detector, and an observation data set is constructed; separating thermal radiation, surface texture and motion features, establishing a four-dimensional feature space containing space-time coordinates, and identifying a shielding area; dynamically adjusting signal parameters to enhance the characteristics of the shielding area and feeding back an optimization record; calculating an optimal scanning path based on the parameter optimization value, and driving the sensor array to perform multi-angle scanning to generate a weighted data set; in combination with historical trajectory data, a trajectory prediction model is optimized in parallel through distributed calculation, turntable parameter synchronization and decision making are coordinated, and finally efficient reconstruction of a multi-target continuous trajectory in a shielded environment is realized. According to the technical scheme provided by the invention, through multi-dimensional feature fusion and dynamic parameter optimization, reconstruction of a multi-target trajectory in a shielding environment is realized, and the environmental adaptability and tracking efficiency of an unmanned system are improved.

The invention discloses a double-domain artifact correction method based on multi-energy-level data and physical prior fusion, and the method achieves the efficient and precise removal of dispersive metal artifacts through the construction of a complete technical scheme of the combination of multi-energy-level data collection, double-domain cooperative correction and physical model constraint. The system has the beneficial effects that the system covers multiple fields of medical treatment, industry, security and protection, aerospace and the like, and has extremely high universality and adaptability. On the basis of a multi-energy-level slow switching scanning protocol, full-angle scanning of at least two energy levels is completed by dynamically adjusting radiation source parameters, and obtained complete multi-energy-level projection data is converted into a high-dimensional tensor through a channel dimension splicing image fusion method. The constructed multi-channel virtual image completely retains attenuation characteristics and structure information of a target object under each energy, provides a more comprehensive input source with discrimination for a deep learning network, builds a data basis for accurate correction in different fields fundamentally, and adapts to various imaging scenes containing metal targets.

The invention belongs to the field of CT (Computed Tomography) tomography reconstruction technology and artificial intelligence, and discloses a finite angle CT reconstruction method based on combination of a three-dimensional conditional diffusion model and synchronous iteration. The CT is an imaging technology which utilizes X-rays to irradiate a target from different angles and acquire projection, and obtains an internal three-dimensional structure through reconstruction. Different from traditional CT depending on nearly full-angle scanning, the method only collects limited-angle projection, and achieves fault reconstruction under the limited-angle condition through a three-dimensional condition diffusion model of space domain-frequency domain two-way decoding and by means of structural generality priori of a workpiece. Meanwhile, projection and fault data consistency correction is carried out in combination with a synchronous iteration reconstruction technology, the advantages of an iteration method in the aspect of physical mechanism characterization are exerted, interpretable physical constraints are provided for a deep learning network, and therefore the reliability and precision of a reconstruction result are improved.

The invention discloses a power distribution station multi-point environment control system and method, and relates to the technical field of power system automation, and the method comprises the following steps: building a time-frequency phase-locked observation baseline based on the scattering relation between an infrared band and water vapor under the condition of sudden humidity increase, inverting aerosol particle size distribution and concentration distribution, and generating a multi-dimensional scattering phase residual field; according to the multi-dimensional scattering phase residual field, a real radiation field is reconstructed by adopting multi-path reverse ray variation solution and combining polarization dual-angle scanning, and a reflection saturation risk spectrum is generated. According to the method, a real radiation field is reconstructed through multi-dimensional observation and inversion, a consistency graph is generated by fusing multi-source data, a misjudgment boundary is accurately identified, a control margin and a switching condition are constructed based on residual playback and time correction, and a steady-state closed-loop control chain is formed in combination with a dynamic regulation and control mechanism. The self-adaptive precise regulation and control of the power distribution station environment and the stability guarantee of the thermal field are realized.

The invention discloses a light paper-based reflection lens for electromagnetic wave beam modulation and a planar reflection antenna thereof, and belongs to the technical field of antennas. The reflecting lens comprises a paper-based main body, the paper base main body is formed by forming a hole structure which is surrounded by a sheet-shaped paper base and is periodically arranged at intervals, and the paper base main body is provided with an upper surface and a lower surface which are opposite to each other and are respectively an electromagnetic wave control surface and a reflection plane; film-shaped symbol units made of metal materials are distributed and attached to the sheet-shaped paper base; the planar reflection antenna further comprises a feed source. The feed source is close to and inversely installed on the control surface, and the feed source reciprocates along the track of the control surface. An electromagnetic wave reflecting plate is arranged on the surface of the reflecting plane. The feed source can be placed at any position of the control surface, and electromagnetic waves emitted by the feed source at any position can be spread out of the reflection lens in a plane wave form after passing through the plane reflection antenna. Moreover, the bandwidth of wide-angle scanning realized by the plane reflecting antenna can reach 80%, which is far wider than that of the traditional reflecting surface antenna.

The invention discloses a lightweight paper-based planar lens for electromagnetic wave beam modulation and a planar antenna thereof, and belongs to the technical field of antennas. The paper base main body is formed by forming a cavity structure which is surrounded by a sheet-shaped paper base and is periodically arranged at intervals, and the paper base main body is provided with an upper plane and a lower plane which are opposite to each other and are respectively an incident plane and an emergent plane of electromagnetic waves; thin-film-shaped symbol units made of metal materials are distributed and attached to the sheet-shaped paper base; according to the symbol units, the metal surface area of the symbol units in the unit volume in the paper-based main body is compared, and the metal surface area of the unit volume in the middle of the plane lens is larger than the periphery of the plane lens. The feed source is mounted close to the incident plane; the electromagnetic waves are propagated in the plane lens in a curve path and converge and are emitted out of the plane lens. When the feed source moves, wide-angle scanning of wave beams can be achieved, the gain reduction of the planar antenna is smaller than 2dB within the scanning range of + / -50 degrees, and meanwhile very high gain and aperture efficiency can be obtained.

The invention discloses a dual circularly polarized common aperture phased array antenna applied to low orbit satellite communication, comprising M * N antenna array sub-arrays, the M * N antenna array sub-arrays are uniformly distributed in M rows and N columns, each antenna array sub-array comprises four antenna units, the four antenna units are uniformly distributed in 2 rows and 2 columns, any antenna unit can completely coincide with the other three antenna units when rotating by a certain angle with the central axis of the antenna array sub-array as the rotating axis, and the first antenna unit comprises a combined radiation layer, a first copper plate, a coupler layer and a second copper plate which are arranged from top to bottom. The coupler layer adopts an orthogonal coupler realized based on a short-circuit three-branch structure to convert an external radio-frequency signal into two radio-frequency signals with a phase difference of 90 degrees, and the two radio-frequency signals are transmitted to the combined radiation layer; the combined radiation layer adopts a linear dipole radiator with separated upper and lower parts to realize broadband design; the broadband wide-angle scanning device has the advantages of being capable of achieving wide-angle scanning, wide in frequency band, simple in overall structure and low in manufacturing cost.

The utility model provides a satellite antenna structure and a satellite communication device, and relates to the technical field of satellite communication. The satellite antenna structure provided by the utility model comprises a plurality of antenna array surfaces, the angles of the plurality of antenna array surfaces are different, and the plurality of antenna array surfaces can work independently; each antenna array surface is used for forming a beam coverage area; according to the invention, the corresponding wave beam coverage areas are respectively formed at different angles through the plurality of antenna array planes, so that the whole airspace is correspondingly divided into the plurality of sub airspaces, the coverage of the whole airspace is realized, the scanning range is improved, the angle required by each antenna array plane during scanning is reduced, the scanning loss generated during large-angle scanning is reduced, and the scanning efficiency is improved. The antenna gain is improved; and secondly, the plurality of antenna array surfaces can independently work to generate wave beams, so that the satellite antenna structure can generate a plurality of wave beams at the same time, thereby obtaining a wider wave beam coverage range at the same time, and improving the scanning efficiency.

The invention relates to the technical field of dual circularly polarized antennas, and discloses a dual circularly polarized antenna, a sub-array, a one-dimensional phased array and a planar phased array. The antenna comprises a direct dual-circularly-polarized radiation structure layer, a circularly-polarized electromagnetic metasurface coupling layer and a circularly-polarized electromagnetic metasurface parasitic layer which are sequentially stacked from bottom to top. The broadband wide-angle scanning dual-circularly polarized phased array provided by the invention has the advantages of low cost, low profile, high radiation efficiency, broadband, dual-circularly polarized wide-angle beam scanning and the like, and is suitable for advanced satellite internet communication and navigation application.

The invention discloses a wafer damage testing device and method, and relates to the technical field of wafer detection, and the method comprises the following steps: S1, device preparation and wafer fixation; s2, starting rotation and ultrasonic synchronous detection; s3, multi-angle data acquisition; s4, signal processing; s5, generating an automatic report; and S6, process matching. Through the meshing block, the placing tray, the fixing column and the meshing wheel, the wafer silicon wafer body is driven to rotate by one circle, the effect that the surface of the wafer silicon wafer body is comprehensively detected through the signal generating device is achieved when the wafer silicon wafer body rotates by one circle, and it is ensured that an ultrasonic probe scans the surface of the wafer silicon wafer body from all angles through rotation movement; and a blind area caused by single-direction detection is avoided.

The present invention provides a computer-implemented method for X-ray analysis. The method includes receiving X-ray analysis data from an X-ray detector having multiple detection channels. The X-ray analysis data includes angular scan intensity data obtained by measuring X-ray intensities when successively scanning the X-ray detector. A series of intensity measurement values ​​is acquired for each detection channel. Each series of intensity measurement values ​​is an intensity angular scan. An angular offset is determined for each detection channel. The method further includes determining, for each of a plurality of detection angle bins, an intensity contribution factor for at least one of the intensity measurements. The intensity contribution factor is determined according to an angle range associated with the detection angle bin and the angular offset of the detection channel. For each of the plurality of detection angle bins, a binned intensity is determined based on the intensity of the at least one intensity measurement value and its corresponding intensity contribution factor.

The invention discloses a millimeter-wave radar system and electronic equipment and a control method thereof, and relates to the technical field of radars, and the millimeter-wave radar system comprises a signal receiving and transmitting circuit, a mechanical rotating antenna, a driving structure and a controller. According to the invention, double antennas are adopted to replace a multi-antenna array, the number of radio frequency link assemblies and a complex calibration process are reduced, the driving structure is utilized to realize continuous adjustment of the azimuth angle of the antennas, multi-angle scanning is realized, dependence on a high-frequency phase shifter or a special beam forming chip is not needed, and the system cost is reduced from the hardware architecture level. Meanwhile, the controller accurately and synchronously regulates and controls the rotation angle of the antenna and a radio frequency transmitting / receiving window, so that the beam pointing of the millimeter wave signal keeps time and space consistency in a signal transmitting stage and an echo receiving stage, and a target reflection signal is ensured to be effectively captured in the optimal residence time; therefore, the dynamic detection precision and the anti-interference capability are improved while the system structure is simplified.

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.

A broadband tight-coupling Vivaldi array antenna comprises N + 2 antenna sub-arrays arranged along an H plane, each antenna sub-array is formed by tightly arranging a plurality of tight-coupling Vivaldi antenna units along an E plane, each tight-coupling Vivaldi antenna unit comprises a dielectric substrate, a radiation patch and a metamaterial patch are printed on the upper surface of the dielectric substrate, a feed balun is printed on the lower surface of the dielectric substrate, and the feed balun is arranged on the upper surface of the dielectric substrate. A radio frequency coaxial connector is arranged at the bottom of the dielectric substrate, a needle-shaped inner conductor end of the radio frequency coaxial connector is connected with the feed balun, and a cylindrical outer conductor end of the radio frequency coaxial connector is in contact with the radiation patch; according to the invention, the miniaturization of the Vivaldi antenna array is realized by utilizing the coupling effect between the units, the edge current path is prolonged by introducing the edge piece and the dummy element at the edge of the array, the active standing-wave ratio of the Vivaldi antenna array during angle scanning is improved to a certain extent, and 60-degree beam scanning is realized on the E surface and the H surface; moreover, the antenna is simple in structure, simplifies the design process of the antenna, and is lower in machining difficulty and cost.

The invention discloses a defect local resonant frequency extraction method based on vibration response space clustering analysis, and belongs to the field of nondestructive testing. The method comprises the following steps: processing an ultrasonic detection data set, calculating a difference function between a frequency spectrum of each scanning point and an average frequency spectrum, extracting a local maximum frequency, carrying out frequency statistics, and screening out an abnormal response frequency; in combination with the spatial distribution characteristics of the detection points, identifying a frequency cluster with spatial aggregation by adopting a density clustering algorithm to form a candidate local resonant frequency set; and constructing an intensity matrix under the candidate local resonant frequency, extracting energy attenuation characteristics in each direction by using an equal-angle scanning method, and comparing the energy attenuation characteristics with a preset threshold value to determine the defect local resonant frequency. The method does not need to preset defect positions and geometric features, can realize automatic extraction of the defect local resonant frequency under the condition of unknown defects, has the advantages of high identification precision, strong anti-interference capability, high calculation efficiency and the like, and is suitable for non-destructive testing requirements in an engineering environment.

The invention discloses an engineering pile hole-forming quality detection method based on an intelligent interconnection foundation platform, and relates to the technical field of engineering pile quality detection, and the method comprises the steps of S1, task issuing and data docking, S2, probe deployment and mud sound velocity calibration, S3, ultrasonic hole wall scanning, S4, sediment thickness measurement, S5, real-time data processing and twinborn feedback, and S6, quality evaluation and decision making. A plurality of groups of transducers are used for scanning a hole wall section at double angles through an orthogonal cross transducer array, millimeter-level distance measurement is realized through an ultrasonic total reflection principle, measurement errors caused by stretching and winding of a traditional measuring rope are avoided, a sediment interface is verified through pressure sudden change points and probe dip angle probe-dip angle coupling measurement, and the measurement accuracy is improved. The problem that a traditional measuring rope is touched by soft mud by mistake is solved, lowered design pile position information is automatically received, the method is suitable for complex stratums such as a pebble bed and a quicksand bed, a visual report and a hole forming model are generated, the recording efficiency is improved, and the hole collapse risk is reduced.

The invention discloses a millimeter wave circularly polarized wide-angle scanning antenna based on inclined axial ratio wave beams. The antenna comprises a dielectric substrate and a plurality of completely identical antenna units with inclined axial ratio wave beams, wherein the antenna units are linearly arranged on the dielectric substrate; the antenna unit comprises a metal radiation patch, a metal floor, a first feed probe and a second feed probe; the metal radiation patch is printed on the upper surface of the dielectric substrate, and the metal floor is arranged on the lower surface; the metal radiation patch is composed of a circular metal radiation patch and a circular ring metal radiation patch; a notch annular gap is formed in the circular metal radiation patch, and two pairs of rectangular gaps are formed in the periphery of the circular metal radiation patch; two pairs of rectangular gaps and a rectangular branch knot are arranged on the circular ring metal radiation patch; the feed probe passes through the dielectric substrate and is respectively connected with the circular metal radiation patch and the circular ring metal radiation patch, and a signal excites the metal radiation patches for radiation in a coaxial line feed mode. The invention has the advantages of wide-angle scanning, low profile, simple structure and the like.

The invention discloses an ultrahigh-scanning-rate leaky-wave antenna based on double-layer offset quasi-complementary SSPP. The antenna comprises a dielectric substrate, double-layer single-side offset quasi-complementary SSPP structures on the upper surface and the lower surface of the dielectric substrate, a double-layer mode conversion structure and a dielectric substrate top layer periodic modulation branch knot. Wherein the longitudinal symmetry axis of the dielectric substrate top layer single-side strip SSPP unit and the longitudinal symmetry axis of the dielectric substrate bottom layer single-side slot SSPP unit are relatively offset, and a double-layer single-side offset quasi-complementary SSPP unit is jointly formed; the double-layer mode conversion structure is composed of a trapezoidal gradual change structure on the top layer of the dielectric substrate and a periodic gradual change slotting structure on the bottom layer of the dielectric substrate; and the dielectric substrate top layer periodic modulation branch knot is formed by compounding a rectangular structure and a semicircular structure loaded at the tail end of the rectangular structure, and is positioned on the opposite side of the top layer single-side strip SSPP structure. The wide-angle scanning ultra-narrow band-pass filter has the advantages of wide-angle scanning, ultra-narrow working bandwidth, ultra-high beam scanning rate and open stop-band suppression, and has very high practical potential in the fields of radar, imaging and the like.

The invention belongs to the marine electromagnetic exploration technology, and relates to a deep-sea hydrothermal sulfide anisotropy detection system and method, and the system comprises a transmitting system which comprises an X-axis coil whose normal direction is located at an X axis, a Y-axis coil whose normal direction is located at a Y axis, and a Z-axis coil whose normal direction is located at a Z axis, and forms an orthogonal structure; the three-component synchronous receiving system comprises a three-axis receiving coil located in a seabed hole, and the three-axis receiving coil continuously collects the magnetic field intensity, the polarization direction and the three-dimensional space coordinates at each receiving node; the three-axis synchronous control system adopts a multi-frequency orthogonal current signal with a phase difference of 90 degrees; and the processor is used for performing spectral analysis on the signal received by the three-component synchronous receiving system, calculating an anisotropic response ratio in each polarization direction in a horizontal plane according to the complex amplitude response, and determining a superior principal axis direction of conductivity anisotropy according to the anisotropic response ratio. According to the invention, full-angle scanning excitation is realized, and the detection capability of the anisotropic structure of the hydrothermal sulfide is remarkably improved.

The present invention discloses an integrated medium-wave infrared laser radar transmitting device, comprising an LD pumped laser light source, a laser crystal, a nonlinear frequency doubling crystal and a filter arranged in sequence; the LD pumped laser light source is used as a light source to emit laser to the laser crystal; the laser crystal is used to generate pulsed laser to the nonlinear frequency doubling crystal; the nonlinear frequency doubling crystal is used to double the laser frequency; the filter is used to filter out part of the laser light beam after the frequency doubling; the LD pumped laser light source, the laser crystal, the nonlinear frequency doubling crystal and the filter are an integrated packaging structure, and generate medium-wave infrared laser output. The laser radar of the present invention generates medium-wave infrared laser output, and emits the laser in a scanning form, realizing multi-angle scanning of radar transmitting end signals.

The utility model discloses an intravascular ultrasound catheter and an ultrasound diagnosis system, the intravascular ultrasound catheter comprises a tip end, an imaging tube section and a conveying tube section which are arranged in sequence from the far end to the near end, and the tip end, the imaging tube section and the conveying tube section are internally provided with guide wire cavities for a guide wire to penetrate; core part cavities are formed in the imaging pipe section and the conveying pipe section, transducer core parts are arranged in the core part cavities, and ultrasonic transducers are arranged at the far ends of the transducer core parts; a transition part is arranged at the far end of the conveying pipe section, so that the conveying pipe section can generate local deformation; the guide wire control component allows the guide wire to move in the operating state, inhibits the guide wire from moving in the locking state, and limits the guide wire at the position away from the ultrasonic transducer as a whole. The intravascular ultrasonic catheter can be bent according to the physiological curvature of a human blood vessel, has the capability of easily passing through a tortuous blood vessel, reduces the risk of pressing the blood vessel and peripheral tissues, effectively reduces the influence of signal shielding caused by a guide wire, and realizes full-angle scanning of the ultrasonic catheter.

The invention provides a dual-polarization wide-angle scanning planar tight coupling array antenna which comprises a plurality of antenna units which are periodically arranged and are composed of metasurface wide-angle impedance matching layers, metal radiators and metal floors. The wide-angle impedance matching layer is composed of two metasurfaces which are stacked up and down and respectively comprise a plurality of metal rings arranged periodically and square metal patches with gradually changing sizes. The wide-angle impedance matching layer of the metasurface can improve the influence of instability caused by rapid change of antenna impedance on a scanning angle, is beneficial for realizing impedance matching in a broadband, and has a relatively wide-angle-domain beam scanning capability; and the radiating body made of the metal material can eliminate bandwidth deterioration caused by common-mode resonance generated by the antenna in a frequency band range, so that the structure of the antenna is effectively simplified on the premise of ensuring the ultra-wideband characteristic.

The invention discloses a three-coordinate measuring machine based on special-shaped surface measurement. An upper working surface where a working table is located is used for bearing a to-be-measured piece; the measuring mechanism is arranged on the moving portal frame, the moving portal frame is made to move on the workbench, and a to-be-measured piece is measured through the measuring mechanism. A measuring head of the measuring mechanism is arranged at the front end portion where the first movement assembly is located, meanwhile, a first air bag pushing piece is arranged at the rear end portion where the first movement assembly is located, and the first air bag pushing piece is inflated and deflated to be matched with a measuring head piece at the front end portion to synchronously achieve axial pivoting movement. And the second movement assembly is located above the first movement assembly, so that the pivoting movement of the first movement assembly and the second movement assembly drives the measuring head piece to move in the whole space direction, and the full-angle scanning measurement of the to-be-measured piece by the measuring head piece is formed. The whole device can realize high-precision measurement of small-size measurement pieces, and the measurement efficiency is 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 invention discloses an image correction model training method and device, equipment and a storage medium, and the method comprises the steps: obtaining a first scanning image, and carrying out the generation of the first scanning image without a corresponding scanning sine image, and obtaining a plurality of scanning sine images in one-to-one correspondence; performing back projection on the scanning sine image, performing summation to obtain a sparse angle scanning image, and comparing the sparse angle scanning image with the full-angle scanning image to obtain a back projection tensor error and a discrete sampling error; constructing an initial network model containing a common convolution module and a traditional linear difference module, and correcting the two modules according to an error to obtain an intermediate network model; and inputting the sine scanning image into the intermediate model to obtain a corrected scanning image, calculating a structural similarity index loss value of the corrected scanning image and the first scanning image, and correcting the intermediate model according to the loss value to obtain a target network model. Projection tensor error and discrete sampling problems in a sparse view angle scanning image can be solved, the precision and detail retention capability of a reconstructed image are improved, and the adaptability of a model to sparse sampling is enhanced.

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 discloses an angle scanning tuning type spectrum sensor based on double rotating shafts and application of the angle scanning tuning type spectrum sensor. The sensor comprises a spectrum detection unit which is installed on a first carrier, is used for receiving incident light, and comprises a detector and an angle sensitive structure arranged on the detector; the first carrier is rotatably connected to the second carrier through a first rotating shaft and can rotate around the first rotating shaft relative to the direction of the incident light; and the second carrier can drive the spectrum detection unit and the first carrier to rotate around the second rotating shaft relative to the incident light direction. Wherein the first rotating shaft and the second rotating shaft are arranged on a reference plane and are parallel to each other or perpendicular to each other; the polarization direction of the incident light is parallel to the reference plane, and the included angles between the incident light and the first rotation axis and the second rotation axis are both larger than 0 degree. According to the invention, the working wavelength range of spectrum detection can be effectively enlarged.

The invention provides a one-dimensional wide-angle scanning phased-array antenna based on a multimode substrate integrated waveguide. The one-dimensional wide-angle scanning phased-array antenna comprises a plurality of antenna units, a rectangular SIW cavity structure formed by a plurality of first metalized via holes connected with the metal bottom plate is arranged at the position, close to the periphery, of each antenna unit radiation patch; and two symmetrical rectangular radiation slots, a rectangular mode fusion groove and two rows of second metalized via holes are etched in the SIW cavity on the radiation patch. According to the SIW cavity structure, the defect of relatively high transmission loss caused by easy leakage of a fringe field in the prior art is avoided, and the scanning range of a wave beam is effectively widened; the rectangular mode fusion groove and the two rows of second metalized via holes change the current path when the antenna works, realize effective fusion of TE10 and TE30 resonant modes, effectively widen the working bandwidth of the antenna and the 3dB beam width of a radiation pattern, and are used for solving the problems of narrow working bandwidth and small beam scanning range in the prior art.

The invention provides a high strabismus imaging method and system for cooperative scanning of an agile attitude and a load. The method comprises the following steps: calculating optimal imaging parameters of a high strabismus mode; establishing a load high-squint stripe imaging method under satellite level flight and left and right side-looking attitudes; establishing an SAR imaging coordinate system in a posture and load cooperative scanning state; establishing an attitude agile maneuvering and load electric scanning coordinated slip aggregation mode implementation method; and establishing an azimuth large squint multi-target mode observation mode. According to the invention, the agile maneuvering capability of the satellite platform and the large-angle scanning capability of the load phased-array antenna are fully utilized, and the agile maneuvering capability of the satellite platform and the large-angle scanning capability of the load phased-array antenna cooperate to realize in-orbit large-squint imaging, so that the method has popularization and practical values for improving the in-orbit application efficiency of light and small