12 results about "Poynting vector" patented technology

To provide a measuring device capable of specifying a leakage direction of noise.SOLUTION: A measuring device includes a probe 2 having a loop-shaped electrode terminal which is electromagnetically coupled with an object to be measured and through which an electric signal corresponding to characteristics of an electromagnetic field flows, and two first and second output terminals connected to the electrode terminal. In addition, the measuring device includes an electric field measuring unit that executes a process of extracting an electric field signal based on a first output-signal I1 outputted from the first output-terminal and a second output-signal I2 outputted from the second output-terminal, and a magnetic field measuring unit that executes a process of extracting a magnetic field signal at the same timing as the electric field measuring unit based on the first output-signal and the second output-signal. The measurement device calculates a pointing vector by performing a cross-spectrum operation on the electric field signal and the magnetic field signal extracted at the same timing, and stores data indicating the calculated pointing vector.SELECTED DRAWING: Figure 1

The invention discloses an angle gather extraction method and device based on construction direction constraint, electronic equipment and a storage medium. The method comprises the following steps: extracting an underground structure angle based on an earlier-stage migration imaging result or a speed model; calculating a shot point end Poynting vector based on an underground structure angle and a wave equation forward propagation wave field; calculating a normal vector of an underground reflection interface based on the underground structure angle; calculating an underground local reflection angle and a local azimuth angle based on the shot point end Poynting vector and the normal vector; an angle domain imaging condition is applied, corresponding reverse time migration is stored based on an underground local reflection angle and a local azimuth angle to obtain an imaging value, and a high-precision omni-directional angle domain common imaging point gather is formed. According to the method, the angle gather precision loss caused by inaccurate detection point wave field Poynting vector direction is avoided, and the precision of the omnibearing angle domain common imaging point gather is improved, so that the seismic imaging quality is remarkably improved.

A laser apparatus with non-collinearly phase-matched frequency mixing includes a nonlinear crystal generating an output laser beam from non-collinearly phase-matched frequency mixing of first and second input laser beams. The output laser beam is subject to walk-off in a walk-off plane. The second input laser beam is less powerful than the first input laser beam. The first input laser beam is directed to more closely align its Poynting vector to the output beam Poynting vector than in collinear phase matching. To achieve good spatial overlap in this phase matching scheme, the second input laser beam is elongated in the walk-off plane, such that the second input laser beam has a greater transverse size than the first input laser beam in the walk-off plane. This non-collinear phase matching scheme is capable of achieving an improved beam quality of the output beam, as compared to collinear phase matching with circular input beams.

The invention discloses a system and a method for generating Poynting vector optical skyrmion based on tightly focused second-order circularly polarized vortex light, and belongs to the technical field of light field regulation and control. The method comprises the following steps: firstly, converting incident light into left-handed or right-handed circularly polarized light through a polaroid and a 1 / 4 wave plate, and then loading a specific topological charge value for the left-handed or right-handed circularly polarized light by using a spiral phase modulator; the tight focusing optical unit is continuously used for tight focusing, and the Poynting vector optical Skyrmion is preliminarily generated; then annular amplitude shaping is carried out on the light field through an annular amplitude modulator, and according to the Richards-Wolf vector diffraction theory, it is calculated that the stable and efficient Poynting vector optical Skyrmion tubular structure can be generated in a three-dimensional free space in a focusing field after second-order circular polarization vortex light passes through a tight focusing optical unit. The optical skyrmion topological characteristics and spatial form are controlled by regulating and controlling polarization, phase, amplitude and focusing conditions of the light field.

Systems, methods and apparatus are provided through which in some implementations an experimental apparatus to modify gravity includes an electrically conducting dome, three or more electrically conducting coils attached to the interior of the electrically conducting dome, and a power source electrically coupled to the electrically conducting coils, the electrically conducting coils configured to generate rotating electromagnetic fields that form a Poynting vector vortex, that produces a gravity force that is perpendicular to the Poynting vector vortex.

The application provides a background velocity field reconstruction method and device based on reflected wave waveform inversion gradient preprocessing, a computer readable storage medium and an electronic device. The method comprises the following steps: based on near-offset information, inverse time migration is performed by calculating a Poynting vector, and a reflected wave field is obtained by reverse migration; the gradient of the velocity is calculated by using a reflected wave full waveform inversion technology based on an adaptive error function, the gradient of the velocity is preprocessed by using illumination energy compensation, the gradient of the preprocessed velocity is used to update the background velocity field, and a more accurate background velocity model is obtained. When the method is applied to model inversion, a more accurate background velocity model can be obtained, and the quality of a migration profile is significantly improved.

A laser apparatus with non-colinear phase-matched frequency mixing includes a nonlinear crystal from which the output laser beam is generated from a non-colinear phase-matched frequency mixing of a first input laser beam and a second input laser beam. The output laser beam undergoes a walk-off in the walk-off plane. The second input laser beam is lower power than the first input laser beam. The first input laser beam is directed to align its Poynting vector more closely with the output beam Poynting vector than colinear phase matching would. To achieve good spatial overlap in this phase matching scheme, the second input laser beam is stretched in the walk-off plane so that it has a larger lateral size in the walk-off plane than the first input laser beam. This non-colinear phase matching scheme makes it possible to achieve improved beam quality of the output beam.

The invention discloses a wave field direction calculation method and device based on a stabilized Poynting vector, electronic equipment and a storage medium. The method comprises the following steps: calculating a wave equation forward propagation wave field through a finite difference algorithm based on a migration velocity field and seismic wavelets; calculating a first gradient operator and a first time derivative of a forward propagation wave field of the wave equation; calculating a first Poynting vector of the forward propagation wave field based on the first gradient operator and the first time derivative; calculating a second gradient operator corresponding to the first time derivative and a second time derivative; calculating a second Poynting vector of the time derivative wave field based on the second gradient operator and the second time derivative; and constructing a stabilized Poynting vector of the forward propagation wave field based on the first Poynting vector and the second Poynting vector. According to the method, the calculation instability of the Poynting vector at the local extreme value is effectively eliminated, the efficient calculation of the real propagation direction of the seismic wave field is realized, and the extraction precision of the angle gather is improved.

The invention discloses a multi-node parallel output angle gather extraction method and device based on adaptive decomposition, electronic equipment and a storage medium. The method comprises the following steps: calculating the number of nodes for angle gather output; decomposing along the Y direction based on the node number, and calculating the output range of each node; calculating a shot point end Poynting vector and a detection point end Poynting vector in the forward transmission process and the backward transmission process of the wave equation by adopting a finite difference algorithm, and further calculating an underground local reflection angle and a local azimuth angle; and respectively applying an angle domain imaging condition based on the output range of each node, storing corresponding reverse time migration according to the local reflection angle and the local azimuth angle to obtain an imaging value, obtaining a local angle domain common imaging point gather of each node, and reducing the local angle domain common imaging point gather as an overall angle domain common imaging point gather. According to the method, the computer memory requirement required by the angle gather can be effectively reduced, the calculation efficiency is improved, and the calculation cost is reduced.

The invention discloses an earthquake attenuation compensation method based on an angle domain common imaging point gather, and relates to the technical field of exploration geophysics, the method comprises the following steps: firstly, carrying out Dix inversion on a migration velocity model, solving an imaging ray domain wave equation by using a space eight-order time second-order staggered grid, and carrying out time migration by using a time consistency principle cross-correlation imaging condition; and an uplink wave field and a downlink wave field are separated in an imaging ray domain, and Hilbert transform is fused to construct an auxiliary vector, so that the oscillation defect of a traditional Poynting vector is thoroughly eliminated, and the high-fidelity ADCIGs is generated. The method has the beneficial effects that a brand new way is created for realizing stable Q field inversion and directional compensation in an angle domain, an angle-related absorption attenuation model can be constructed by utilizing high-precision incident angle information in ADCIGs, and the global averaging processing limitation of traditional inverse Q filtering is broken through.