32 results about "Refraction" patented technology

The waveplates herein (A) can have high performance across a broad wavelength range and broad range of incident angles; (B) can be thin; and (C) can withstand a high temperature. The waveplates can include ribs 12 on a substrate 11 with a channel 13 between each pair of adjacent ribs 12. Each rib 12 can include the following layers in the following order moving outward from the substrate: a bottom-medium-layer BM (nBM), a high-layer H (nH), then a top-medium-layer TM (nTM). Each rib 12 can be located on a bottom-low-layer BL (nBL). A top-low-layer TL (nTL) can be located on a face TMF of the top-medium-layer TM farthest from the substrate 11. Relationships between indices of refraction of these layers can be nBL<nBM<nH and nTM<nTM<nH.

The invention relates to the technical field of ocean and land geophysical exploration, and particularly discloses a multiple refraction wave suppression method and device, and the method comprises the steps: converting seismic data into a common detection point gather, and obtaining common detection point gather data; performing Radon transformation on the common detection point gather data to obtain Radon domain data, and calculating multi-channel similarity of the Radon domain data in the Radon domain; calculating a weighting function in a multi-refracted wave existence window, and processing the Radon domain data by using the weighting function to obtain processed data; performing Radon inverse transformation on the processed data to obtain a multiple refraction wave prediction model; and the multiple refracted waves are suppressed through a self-adaptive subtraction method. According to the method, the similarity characteristics of the multiple refracted waves in the Radon domain are utilized, weighting processing is carried out in a window where the multiple refracted waves exist, the prediction precision of the multiple refracted waves is enhanced, finally, the multiple refracted waves are eliminated through adaptive subtraction, the multiple refracted waves in seismic data can be effectively suppressed, and the signal-to-noise ratio of the data and the imaging quality are improved.

The invention belongs to the technical field of image processing, and particularly relates to a self-adaptive phased array C scanning imaging method for a surface thread curved surface, which sequentially comprises the following steps of: (1) establishing a curved surface coordinate; step (2), generating propagation prior; step (3), executing a step of cTFM imaging; and step (4), executing a step of RPCA decomposition imaging. According to the method, thread appearance point cloud is synchronously collected through a contourgraph and an encoder, a spiral expansion coordinate domain and a curved surface coordinate index table are established through double quaternion spiral expansion, and geometric continuous modeling of the rotating and feeding process is achieved; in the coordinate domain, a propagation prior lookup table containing refraction time intervals is generated based on a rapid propulsion method, and the refraction propagation path of sound waves between the wedge block and the detected body is accurately described.

The application belongs to the field of oil and gas geophysical exploration, and discloses a kind of geophone combination to improve the calculation method of signal-to-noise ratio degree of single shot data, and the signal-to-noise ratio of geophone combination is improved multiple times compared with geophone single point G , the surface wave suppression amplitude value of geophone combination b 1, the refraction wave suppression amplitude value b 2, the reciprocal of the signal-to-noise ratio of geophone combination suppression random interference wave b 3, the amplitude ratio of surface wave and refraction wave k , the surface wave suppression coefficient, refraction wave suppression coefficient and random interference wave suppression coefficient of geophone combination are obtained, and finally the formula of the signal-to-noise ratio improvement multiple of geophone combination compared with geophone single point is obtained.The application is suitable for calculating the degree of signal-to-noise ratio of single shot data improved by geophone combination, the calculation result is clear, the reliability is strong, the calculation method is fast, and the quantitative basis can be provided for the selection of geophone combination number and group distance in seismic acquisition engineering technical design.

The present application relates to the field of eutrophication lake water ecological restoration, and discloses a device and system for improving underwater light conditions of a lake. Natural light on the water surface is introduced into the underwater area near the device through refraction and reflection by using a light path system, effectively improving the underwater light intensity. A wave dissipation system is arranged below the light path system to prevent disturbance of the water body and sediments by small waves, to a certain extent, reducing the influence of sediments and resuspension on water transparency, and further improving the underwater light conditions. The light path system, the wave dissipation system and the underwater fixing system are sequentially fixed and connected from top to bottom, and the height of the light path system and the wave dissipation system is adjusted through the underwater fixing system with the rise and fall of the water surface, improving the applicability of the device. The device has the characteristics of simple structure, convenient operation, good performance, easy installation and recycling, etc. It can effectively reduce the adverse effects of insufficient underwater light of the lake and wave disturbance on the growth of submerged plants.

The present application relates to the technical field of nondestructive testing of nuclear power equipment, and provides a nuclear power metal welded joint nondestructive testing method based on ultrasonic phased array imaging and application, comprising calculating the ultrasonic longitudinal wave velocity and transverse wave velocity of the nuclear power metal material; calculating the defect acoustic scattering response distribution under different angles of the organic glass wedge; using an ultrasonic array detection system, identifying bright spot abnormal points in an ultrasonic phased array scanning image and full matrix capture data corresponding to the positions; using a time reversal operator decomposition algorithm to perform signal denoising processing, obtaining denoised ultrasonic array signals; calculating the propagation time of the sound waves emitted by each element of the ultrasonic phased array after refraction through the glass wedge to each grid point, obtaining the Hilbert transform value of each grid point corresponding to the propagation time, and generating an ultrasonic imaging graph of the region; performing delay multiplication superposition and vector coherence factor denoising processing on the imaging data, and obtaining a welded joint nondestructive testing imaging result.

This invention belongs to the field of lidar detection and provides a dynamic underwater target localization method based on lidar. The main steps include: S1: The lidar simultaneously emits a blue-green beam and multiple near-infrared beams surrounding the blue-green beam; S2: Obtaining the pointing angles of the multiple near-infrared beams and the blue-green beam emitted by the lidar, and multiple water surface distance signals received by the lidar from the near-infrared beams returning via the water surface; S3: Calculating the normal vector of the wavefront cell where the blue-green beam intersects with the air-water interface, and determining the position of this intersection point; S4: Calculating the angle of refraction of the blue-green beam through the water surface; S5: Obtaining the three-dimensional coordinates of the underwater target. This invention captures dynamic water surface reflection characteristics using near-infrared beams, accurately obtains wavefront position and angle information, and simultaneously emits blue-green beams for dynamic underwater target detection, thereby achieving high-precision localization of underwater targets.

The invention relates to an integrated navigation precision improvement method based on fused hydrological information, which belongs to the technical field of inertial navigation, and comprises the following steps: S1, based on hydrological information of a target navigation sea area, calculating to obtain a sound velocity profile of the target navigation sea area and wave beam angles of each water layer of the target navigation sea area; s2, based on the sound velocity profile of the target navigation sea area and each water layer beam angle, obtaining a corrected Doppler measurement speed; s3, compensating the corrected Doppler measurement speed based on the beam incident angle after equivalent refraction to obtain a compensated Doppler measurement speed; and S4, fusing the compensated Doppler measurement speed with the inertial navigation speed to obtain a corrected navigation calculation result of the ship or the underwater vehicle. According to the invention, the hydrological environment data and the inertial navigation data are fused, so that the position precision and reliability of the ship or the underwater vehicle during long-time autonomous navigation are greatly improved.

The invention discloses a satellite-borne laser water depth correction and extraction method considering sea surface waves, and the method comprises the following steps: carrying out the sea surface wave fitting of satellite-borne laser sea surface photon points through employing a smooth spline function, and obtaining the instantaneous wave slope and elevation value of each sea surface photon position; modeling the incident line of each photon point according to the fitting result, and matching the seabed photon points with the sea surface photon points based on the modeling line of the incident light to calculate an initial water depth value; carrying out refraction correction on the initial water depth value according to a wave angle and a photon incidence angle of a sea surface wave fitting result of a corresponding position in combination with marine environment characteristics; and performing geophysical correction on a result after refraction correction to obtain a water depth extraction result based on the average sea level. Through water depth correction considering the sea surface wave angle and the wave height, sounding errors caused by sea surface waves are effectively compensated, and the satellite-borne laser water depth extraction precision and reliability are remarkably improved.

This invention relates to a method, apparatus, electronic device, and storage medium for fast and slow shear wave surface modeling. The method involves: picking up the first arrival time of earthquakes within a preset offset range; dividing the first and second shear wave seismic data into identical ground grids; selecting multiple ground grids and determining the apparent first arrival velocity of each grid, thus determining the refracted wave offset range; determining the first shear wave refraction velocity and the first shear wave delay time at the shot and receiver points; determining the first shear wave surface velocity based on the surface data of the first shear wave seismic data; obtaining the first shear wave surface model based on the first shear wave correlation data and outputting the high-velocity top information of the shot and receiver points; determining the second shear wave refraction velocity and the second shear wave delay time at the shot and receiver points; and obtaining the second shear wave surface model based on the high-velocity top information of the shot and receiver points and the second shear wave correlation data. In other words, this invention achieves synchronous and coordinated establishment of a surface model using fast and slow shear waves.

A waveguide structure. In some embodiments, the waveguide structure, includes: a first waveguide (105), a second waveguide (120), and a third waveguide (125) on a substrate (115). The first waveguide (105) may be at a different height than the second waveguide (120). The waveguides may be configured to cause light to couple between the first waveguide (105) and the second waveguide (120), and between the second waveguide (120) and the third waveguide (125). The first, second, and third waveguides (105, 120, 125) may be composed of respective materials having a first index of refraction, a second index of refraction, and a third index of refraction respectively. The third material may include silicon and nitrogen. The second index of refraction may be greater than the first index of refraction, and less than the third index of refraction.

The invention discloses an airborne laser radar sea surface point cloud water depth inversion method, and particularly relates to the technical field of airborne laser radar water depth measurement. The method comprises the following steps: acquiring an echo point cloud and a waveform energy sequence, constructing a three-dimensional point cloud energy matrix, calculating a point cloud local density gradient and a waveform attenuation coefficient, generating a composite scattering characteristic field, constructing a sea surface perturbation constraint model, and performing curved surface fitting on a sea surface echo cluster to obtain a sea surface dynamic fluctuation parameter; performing refraction path reconstruction on the underwater echo cluster to obtain a corrected underwater point cloud depth sequence; calculating a point cloud density change rate in a depth direction, performing coupling operation with the composite scattering characteristic field to generate a water body attenuation compensation coefficient matrix, and calculating a water depth value of the target area through depth statistical regression to obtain a water depth inversion result; the method can effectively weaken the influence of sea surface perturbation and water body scattering on echo signals, and improves the precision and stability of airborne laser radar water depth inversion under complex sea conditions.

This invention discloses a method for correcting the water diffuse attenuation coefficient based on the water surface lensing effect of hyperspectral resolution lidar. It constructs a water surface lensing effect model to characterize the focusing phenomenon of pulse energy, uses ECKV wave spectrum to simulate the dynamic water surface, and tracks the laser pulse penetrating the water body based on the law of light refraction. The degree of pulse energy focusing is statistically analyzed using a two-dimensional histogram. Based on the unique molecular and particle separation characteristics of hyperspectral resolution lidar, the method corrects the overestimated water diffuse attenuation coefficient in shallow water areas due to the water surface lensing effect. This invention provides a new solution for correcting the water diffuse attenuation coefficient in shallow sea areas, contributing to improved water quality monitoring accuracy in shallow water regions.

The application provides a curved surface layered medium acoustic emission source positioning method based on a shortest path principle, first constructs a refraction path control equation of an acoustic emission source to a sensor position, secondly calculates a refraction point position according to the shortest path principle and orthogonal constraint, and finally solves the position of an optimal acoustic emission source under the refraction path through Taylor first-order expansion to realize acoustic emission source positioning. The method can solve the positioning deviation problem caused by acoustic wave refraction in a complex medium, is easy to implement and has high positioning precision.

The invention discloses a reservoir dam body leakage vibration monitoring method based on distributed sound sensing, and relates to the technical field of dam body safety monitoring, and the method comprises the following steps: obtaining a unified time baseline, constructing a phase reference field, injecting calibration pulses on the basis of the phase reference field, inverting a multi-medium sound velocity tensor, and forming a real-time refraction map; a distributed sensing node arrival angle sequence is obtained under the constraint of a real-time refraction atlas, a wavefront curvature field is solved, an energy anomaly convergence kernel is locked, and a space positioning basis is established for leakage signal feature extraction. According to the invention, a closed loop chain from modeling, purification and positioning to regulation and control is constructed, high-precision leakage identification, dynamic extinguishing of false hot spots and enhancement of real signals are realized through a refraction spectrum, coherent reconstruction and digital twinning, the sensitivity, accuracy and regulation and control capability of dam body leakage monitoring are remarkably improved, and conversion from passive identification to active control is realized.

The invention discloses a TDCR sector-ring wave-shifting coupling measurement method and device under high luminous efficiency, a TDCR sector-ring wave-shifting coupling module is used for measurement, three PMTs (respectively A, B and C) are arranged at an angle of 120 degrees, Cerenkov light subjected to wave shifting can be received by two PMTs, light received by another PMT is mainly scattered and refracted light, the generated signal quality is poor, and the TDCR sector-ring wave-shifting coupling module is used for measurement. The optimal counting position can be determined according to the relationship, and as the TDCR quenching correction curve has consistency with nuclide, the change of the TDCR value is sufficient to form a quenching correction curve during the displacement of the standard sample with known activity, and a plurality of bottles of series quenching sample sources with different quenching degrees do not need to be prepared, so that the operation convenience is greatly reduced, and the detection efficiency is improved. The irradiation risk in personnel is reduced, and the method is particularly suitable for measurement of nuclides with relatively high Cerenkov luminous efficiency, such as Sr-89, Y-90, P-32 and the like.

The present application belongs to the technical field of electromagnetic wave propagation path calculation, and discloses a method, system, device and medium for calculating the three-dimensional propagation path of electromagnetic waves in the multi-layer medium overlapping structure of the external insulation equipment of a power system, to solve the problem of the calculation efficiency and accuracy of electromagnetic wave propagation paths. The method comprises: constructing an electromagnetic wave propagation model, and obtaining the relative dielectric constant of each layer of medium and the radius of each layer of circular interface; setting the positions of the transmitting antenna, receiving antenna and detection point; determining the angle range of the refraction point of each medium interface according to the radius relationship of the adjacent layer interface, and discretely selecting multiple candidate refraction points on each layer interface; calculating the total propagation time of each possible propagation path based on the relative dielectric constant through the traversal method; and determining the path with the shortest total propagation time among all possible propagation paths as the actual propagation path of the electromagnetic wave based on Fermat's principle.

This application discloses a method, apparatus, and computer equipment for establishing a near-surface velocity model, belonging to the field of geophysical exploration technology. The method includes: determining the time delay and refraction velocity corresponding to multiple shot points and multiple receiver distances based on multiple first arrival times and multiple shot-receiver distances; determining the regolith thickness and regolith velocity corresponding to the multiple shot points based on the time delay and refraction velocity; determining the regolith thickness and regolith velocity corresponding to the multiple receiver points based on the time delay and refraction velocity; determining a constraint model based on the refraction velocity, regolith thickness, and regolith velocity corresponding to the multiple shot points and multiple receiver points; and performing tomographic inversion on the constraint model to obtain the near-surface velocity model. By utilizing various information corresponding to the multiple shot points and multiple receiver points, and combining the refraction wave method and travel-time tomography, the accuracy of the near-surface velocity model is improved.

The invention relates to the technical field of seismic data processing, and particularly discloses a near-surface velocity modeling method and device, and the method comprises the steps: defining an initial model based on single shot data, refracted wave first arrival data and elevation; and based on the initial model, carrying out inflection wave three-dimensional chromatography inversion iteration, and in the iteration process, finely adjusting and refining inversion parameters until the velocity depth is unchanged, so as to obtain a near-surface velocity model. Based on an initial model, inflection wave three-dimensional tomography inversion iteration is carried out, inversion parameters are finely adjusted and refined in the iteration process until the speed and the depth are not changed, a near-surface speed model is obtained, all first-motion waves are allowed to be adopted for modeling rotation waves, a refraction interface does not need to be recognized, and the speed is changed in a grid shape; and compared with reflected wave chromatography, a more robust near-surface velocity model is obtained, and the geologic features are depicted more finely.

The invention discloses a first arrival refraction area linear interference suppression method, a product, a medium and equipment, and belongs to the technical field of seismic data processing. The method comprises the following steps: designing different parameters aiming at inconsistent linear characteristics of different frequency band ranges; the multi-scale and multi-directional representation capability of curvelet transform is utilized to decompose seismic data into subsets with different scales and directions, and then accurate wave field separation is realized through Radon transform in each curvelet domain, so that refraction interference with relatively strong energy in a first arrival refraction region is eliminated, and effective reflection signals in a large offset range are recovered. The method can accurately suppress first-arrival refraction interference, recover effective signals, and improve seismic imaging quality.

A diffuser including a substrate having a first surface and a second surface opposite the first surface; a reflective layer, and a refractive layer, in which the refractive layer has an index of refraction n>1 is disclosed. A system and a method of using the system are also disclosed.

This invention relates to the field of petroleum geophysical exploration technology, and discloses a method and equipment for strip-by-shot delineation of first arrival regions. The method includes: dividing the original seismic data into multiple seismic gathers according to a preset azimuth range and offset range; determining the first first arrival region of the current seismic data based on the amplitude energy of each seismic gather and its corresponding offset; scanning each seismic gather point by point along the time direction, using the receiver line as a unit, to determine the second first arrival region; generating a direct wave refraction model corresponding to each seismic gather, and determining the third first arrival region of the current seismic data based on the direct wave refraction model; calculating the upper and lower first arrival energy ratios and signal-to-noise ratio variances of the first, second, and third first arrival regions within a preset time window to determine the final first arrival region of the current seismic data. This invention significantly improves the efficiency of first arrival picking.

The simulation method and system of partial discharge ultrasonic wave considering the complex structure of the transformer, the method comprises the following steps: constructing a simulation model, setting multiple point probes, selecting a point probe as a point source, obtaining the original sound pressure waveform received by the point probe and preprocessing, determining the rough arrival time of the precursor wave, calculating the theoretical propagation time, verifying the precursor wave, correcting the rough arrival time; calculate the theoretical reflection propagation time and the theoretical refraction time of the subsequent waveform, compare the calculation results with the peak time of the subsequent waveform respectively, and determine the type of the subsequent waveform; based on the position of the point source, the position of the point probe, the arrival time of the precursor wave and the subsequent waveform, the propagation path of the precursor wave and the subsequent waveform is determined. The present application can accurately identify and invert the arrival time, propagation type and propagation path of the ultrasonic wave by constructing a simulation model, which significantly improves the accuracy and reliability of the analysis and positioning of the internal partial discharge ultrasonic propagation of the complex transformer.

The present application relates to a kind of based on the combination navigation precision promotion method of fusion hydrological information, belong to inertial navigation technical field, comprising the following steps: S1, based on the hydrological information of target navigation sea area, the sound speed profile of target navigation sea area and its each water layer beam angle are calculated;S2, based on the sound speed profile of the target navigation sea area and each water layer beam angle, obtain corrected doppler measurement speed;S3, based on the equivalent refraction after beam incidence angle, the compensated doppler measurement speed after the corrected doppler measurement speed is compensated;S4, the compensated doppler measurement speed and inertial navigation speed are fused, and the corrected ship or underwater vehicle navigation solution result is obtained.The present application fuses hydrological environment data and inertial navigation data, and the position accuracy and reliability of ship or underwater vehicle in long time autonomous navigation are greatly improved.

The invention discloses a stratified medium acoustic emission source wave-velocity-free positioning method based on refraction correction, which comprises the following steps: arranging a plurality of probes on an upper-layer medium to detect elastic waves emitted by an acoustic emission source in a lower-layer medium, and recording the time when the elastic waves reach the probes; any two probes are selected to construct a time difference equation, a virtual wave velocity equation is obtained based on the time difference equation, and a target function is constructed; and iteratively solving the coordinates of the refraction points corresponding to the probes, then substituting the coordinates of the refraction points into the time difference equation, and carrying out global search and adjustment on the variables to be optimized based on an optimization algorithm to minimize the target function so as to obtain the optimal coordinates of the acoustic emission source. According to the method, the wave velocity ratio is introduced to replace independent wave velocity measurement, positioning precision reduction caused by wave velocity measurement errors or real-time changes is avoided, an elastic wave propagation path is accurately corrected by solving refraction point coordinates, and the problem of insufficient positioning precision caused by wave velocity errors and refraction neglect in a non-uniform medium is solved.

The invention provides a high-quality-factor film bulk acoustic resonator and a preparation method thereof. The resonator is provided with a patterned top electrode; the top electrode is also provided with a transverse sound reflection structure; the transverse sound reflection structure is a concave pattern combination structure arranged in the top electrode; and the concave-surface-shaped pattern combination structure is filled or not filled. By regulating and controlling the angle of the longitudinal concave surface, the reflected sound waves form transverse sound wave gathering at the interface of the concave surface, are reflected along different refraction angles of different interfaces and are gathered back to the center of the piezoelectric material, so that energy leakage caused by the transverse sound waves is effectively inhibited, and meanwhile, the sound waves are reflected back to the center of the piezoelectric film; transverse stray sound waves are prevented from being formed, and the quality factor Q of the resonator is improved; and a spurious mode is prevented from being introduced in the process of suppressing transverse sound wave leakage.

The application discloses a shock wave free field overpressure measurement method and system based on high-speed photography of a UAV, and relates to the field of shock wave measurement. Based on the refraction phenomenon of light caused by a wave front during propagation of a shock wave in air, high-speed photography of a ground explosion process is performed by using a high-speed camera of a UAV, an image difference value algorithm and an edge recognition algorithm are used to determine the wave front of each frame of shock wave image, the propagation speed of the wave front in air is obtained, analysis and measurement of the shock wave wave front are realized, and then the shock wave free field overpressure is obtained.

This invention provides a true triaxial positioning method considering refraction path and weight estimation. First, a refraction path control equation is constructed based on sensor coordinates and arrival time. Second, considering the influence of time error, the residual of the refraction path control equation is calculated, and the equation weights are estimated. Then, the refraction points in different directions are solved using Snell's law and orthogonal constraints. Finally, the coordinates of the acoustic emission source are iteratively solved using weighted correction terms to achieve acoustic emission source positioning. This application can solve the positioning deviation problem caused by sound wave refraction in true triaxial experiments, and the method has stable and accurate positioning performance.

The invention discloses a common midpoint gather refracted wave residual static correction method, which comprises the following steps of: 1, assembling actual seismic records acquired in the field into a common shot point gather, and carrying out linear dynamic correction on the common shot point gather so as to eliminate the difference of propagation time of refracted waves of the same refraction layer; 2, picking up the first arrival time of the refracted waves by using an automatic picking and interactive modification method, and extracting the picked first arrival time according to a common midpoint gather; according to the method, refracted wave first arrival time pickup is carried out on common shot point gathers of linear dynamic correction, extraction is carried out according to common midpoint gathers, curve fitting is carried out on the first arrival time of each common midpoint gather, the fitting time difference of receiving points of each common midpoint gather is solved, the fitting time difference is decomposed into shot point and detection point residual static correction values through a statistical method, and the residual static correction values of the shot points and the detection points are calculated. The problem that the reflected wave residual static correction method is difficult to take effect when the signal-to-noise ratio of the reflected wave is low is solved, and the purpose of improving the processing effect is achieved.