54 results about "Refraction" patented technology

The invention discloses an acoustic temperature field reconstruction algorithm based on sparse matrix and refraction effect consideration, and belongs to the field of acoustic temperature measurement. The algorithm introduces a sparse reconstruction technology and refraction effect optimization to solve the problems of large reconstruction error of an underdetermined equation set, sensitivity to a measurement error and the like caused by the fact that the number of sound rays is smaller than a grid sectioning number in existing acoustic tomography. The method comprises the following specific steps: dividing a temperature measurement area into N grids, constructing a compressed sensing model through an observation matrix A and a sparse base psi, reconstructing a sparse signal by using an improved generalized orthogonal matching algorithm, namely IMOMP, reconstructing a temperature field through a relationship between sound slowness and temperature, and improving precision by using cubic spline interpolation. Meanwhile, the sound wave refraction effect in the non-uniform temperature field is considered, the sound ray path layout is optimized, the algorithm effectively deals with inverse problem instability, the reconstruction error is reduced, the anti-noise capability is improved, and the method is suitable for complex temperature field reconstruction and has application value for industrial temperature measurement.

The invention discloses an oval scanning laser radar wave refraction correction error correction method, which belongs to the technical field of airborne laser sounding, is used for airborne laser radar underwater topographic survey wave refraction correction, and comprises the following steps of: performing filtering processing on sea surface point cloud by adopting a statistical outlier removal filtering method; and extracting a sea surface gradient normal vector corresponding to each point by adopting an optimized moving least square method, simplifying the measurement process of the oval scanning laser radar to be carried out under a carrier coordinate system, constructing a refraction correction model by utilizing a Snell law and a vector decomposition method, and obtaining a corrected seabed point cloud coordinate. According to the method, the sea surface point cloud data is denoised, the actually measured sea surface point cloud is fitted through the moving least square method, polynomial fitting is replaced with covariance matrix characteristic decomposition, calculation is easy and convenient, polynomial fitting errors are avoided, the process is greatly simplified through vector decomposition calculation, and only a single solution exists.

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 light refraction demonstration device comprises a supporting mechanism, a test bed, a plurality of light sources and a medium groove, the supporting mechanism comprises a bottom plate, a vertical supporting plate with the lower end fixedly connected with the bottom plate and a vertical mounting plate fixedly connected with the upper end of the supporting plate, and the rear end of the test bed is connected with the front end of the mounting plate. A milky white light screen is arranged at the front end of the test bed, the medium groove is in a semi-cylinder shape and comprises two opposite semicircular walls, an arc wall and a side wall opposite to the arc wall, a groove cavity with an opening located in the side wall is formed in the medium groove, the side wall is located at the upper end, the left end and the right end of the side wall are each connected with a connecting lug, and the connecting lugs are connected with the test bed through screws. And a medium is filled in the medium groove. The problems that the light path phenomenon is hidden and difficult to distinguish and the medium is single are solved.

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 present invention discloses a method and apparatus for monitoring seismic waves in underground caverns caused by blasting. The method includes measuring the vibration velocity of the cavern roof along the horizontal direction and / or the longitudinal direction; suspending a right-angle reflector on the roof; emitting and receiving reflected laser light from the floor towards the reflector; acquiring the optical deflection displacement, optical path difference, and time interval of the reflected laser light before and after the blast; and obtaining the vibration velocity along the horizontal direction and the vibration velocity along the longitudinal direction using a velocity formula. Specifically, it utilizes a right-angle reflector to reflect the laser light reflected back towards the roof, and uses the optical path difference and optical deflection displacement generated by the laser light's displacement with the right-angle reflector during reflection to indirectly measure the wave velocity of the roof where the right-angle reflector is fixed; it uses a beam splitter to form two optical paths through refraction and reflection to measure the optical path difference and optical deflection displacement separately; and it uses a convex lens to solve the beam offset caused by optical deflection displacement during comprehensive measurement when measuring the optical path difference. The method is simple in structure, easy to operate, and has strong practicality and wide applicability.

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.

The invention relates to the technical field of line fault positioning, in particular to a risk early warning method and an early warning device for a forest fire caused by a power transmission line fault, and the method comprises the steps: obtaining a transient traveling wave signal at each monitoring point, carrying out the phase-mode transformation of the transient traveling wave signal, and extracting a forward traveling wave signal of each monitoring point; the first interference degree, the traveling wave distortion degree, the superposition complexity, the second interference degree, the adjustment coefficient and the corrected decomposition layer number of each monitoring point are determined, and fault positioning is carried out on the power transmission line; and early warning the forest fire risk caused by the power transmission line fault by using a fuzzy reasoning algorithm according to the meteorological environment condition and the vegetation dense condition at the fault position. According to the method, by correcting the number of decomposition layers, the masking interference influence of pulse noise and mixed refraction and reflection traveling waves on traveling wave characteristics is eliminated, the precision of positioning the single-phase earth fault of the power transmission line is improved, and early warning is more accurately performed on the forest fire risk caused by the power transmission line fault.

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 utility model discloses broken bridge aluminum for enhancing the sound insulation effect, which comprises a frame body I and a frame body II, an upper heat insulation strip and a lower heat insulation strip are arranged between the frame body I and the frame body II, and the upper heat insulation strip and the lower heat insulation strip are arranged between the frame body I and the frame body II and are used for connecting the frame body I and the frame body II. A reflecting corrugated surface is arranged on the inner side surface of the frame body I, and two reflecting plates I are further arranged on the frame body I and are respectively arranged on the upper side edge and the lower side edge of the frame body I. A reflection corrugated surface is arranged on the inner side surface of the frame body II, a reflection corrugated surface is also arranged on the inner side surface of the frame body II, and two reflection plates II are also arranged on the frame body II and are respectively arranged on the upper side edge and the lower side edge of the frame body II. The reflection corrugated surfaces capable of changing the refraction direction of sound waves are arranged in the first frame body and the second frame body, the refraction direction of the sound waves is changed, the sound waves are refracted for multiple times in the frame bodies, energy of the sound waves is consumed to the maximum degree in the frame bodies, and therefore the purpose of improving the sound insulation effect is achieved.

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 belongs to the technical field of electromagnetic wave propagation, and particularly discloses a refraction approximation ray tracing method for calculating an electric field in a metal cavity, refraction approximation is carried out based on a mirror image method, and due to the fact that the mirror image method has the advantage of being high in accuracy in calculation of a regular geometric area, in a simplified model of a plasma large science device, the calculation accuracy is high. Under the condition that it is guaranteed that too large calculation amount is not generated, the area capable of being calculated is larger than that of a common electromagnetic calculation method, and the method is enough to be suitable for a calculation space in a metal cavity in a conventional experiment environment. The method can be applied to radio wave propagation calculation in the plasma under the condition that the radio wave frequency is greater than the plasma frequency. Errors generated by a receiving ball algorithm used by a forward ray tracing algorithm are avoided, redundant rays are filtered at the beginning of calculation, and discussion of receiving ball ray deduplication is avoided.

The invention discloses a sound ray tracking incident angle calculation method based on a weighting function, relates to the technical field of ocean underwater acoustic positioning, is used for obtaining a sound ray tracking incident angle in the process of realizing accurate positioning of a seabed control point by depending on a sound ray tracking algorithm, and comprises the following steps: solving an approximate incident angle based on coordinates of a shipborne transducer and a seabed transponder; converting the initial incident angle through the Snell refraction law to obtain an iteration initial value; calculating the initial incidence angle through a weighting function to obtain a Newton downhill factor; constructing a sound velocity profile layer through a depth meter and a sound velocity profiler to obtain a time delay calculation formula; and constructing a Newton downhill method iterative formula, and calculating to obtain a sound ray tracking incident angle based on the obtained approximate incident angle, an iterative initial value, a Newton downhill factor and a time delay calculation formula. According to the method, a traditional Newton iteration method is improved, the stability and iteration efficiency of solving the sound ray tracking incident angle through the Newton iteration method are improved, and the problem that sound ray tracking cannot be carried out when the incident angle is unknown is solved.

The application discloses a sound ray tracking incidence angle calculation method based on a weight function, relates to the technical field of ocean underwater acoustic positioning, and is used for obtaining a sound ray tracking incidence angle in precise positioning of a seabed control point realized by relying on a sound ray tracking algorithm, and comprises the following steps: solving an approximate incidence angle based on coordinates of a shipborne transducer and a seabed transponder; converting an initial incidence angle by a Snell refraction law to obtain an iteration initial value; calculating the initial incidence angle by a weight function to obtain a Newton down-slope factor; constructing a sound velocity profile layer by using a depth gauge and a sound velocity profiler to obtain a time delay calculation formula; constructing a Newton down-slope method iteration formula; and calculating the sound ray tracking incidence angle based on the obtained approximate incidence angle, the iteration initial value, the Newton down-slope factor and the time delay calculation formula. The application improves the traditional Newton iteration method, improves the stability and iteration efficiency of the Newton iteration method for solving the sound ray tracking incidence angle, and solves the problem that the sound ray tracking cannot be performed when the incidence angle is unknown.

The invention relates to the technical field of rock mass property evaluation, in particular to a rock mass property rapid evaluation method, device and system, and the method comprises the steps: obtaining ultrasonic propagation data of a target rock mass in a plurality of measurement directions, based on the wave velocity difference of each depth position in different measurement directions and the wave velocity difference of each measurement direction at different depth positions under each frequency, determining refraction characteristics of the target rock mass at each depth position in each measurement direction; determining a refraction correction coefficient of the corresponding position based on the refraction characteristic; correcting the measurement wave velocity of each depth position based on the refraction correction coefficient to obtain a corrected equivalent wave velocity of each depth position; and evaluating the rock mass property of the target rock mass based on the corrected equivalent wave velocity of each depth position. According to the method, the real equivalent wave velocity of each depth position can be obtained, and then the rock mass property of the target rock mass can be accurately evaluated.

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.