66 results about "Poynting vector" patented technology

Several methods are disclosed for the generation of coherent short-wavelength electromagnetic radiation through optical nonlinear frequency mixing means. The invention involves several stages of efficient nonlinear frequency conversion to shift the output of high-power infra-red fiber-lasers into the vacuum ultraviolet (VUV). The described laser source architecture is designed around non-critically phase-matched (NCPM) sum-frequency mixing (SFM) interactions in the nonlinear crystal CLBO. The NCPM interaction is an optimum condition for bulk frequency conversion of cw radiation because it allows tight focusing of the input laser radiation without Poynting vector walk-off, thereby increasing the non-linear drive significantly. The sub-200-nm output wave is generated from SFM of a long-wave IR laser field and a short-wave UV laser field. The long-wave laser beam may be derived directly from a rare-earth-doped fiber laser, whereas the short-wavelength UV beam is provided as the fourth frequency harmonic of a second rare-earth-doped fiber laser system.

The invention discloses a rotator angular velocity measuring system based on vortex beams. The system is based on a Doppler frequency shift principle and direction characteristics of Poynting vectors of the vortex beams. The measuring vortex beams are input vertically along the rotation axis, incident light and reflected light are in the same path, an emission end and a reception end of a detection system shared the same point, and a measurement result of the angular velocity can be obtained rapidly and accurately. During use, it is only required to irradiate the measuring vortex beams emitted by the system vertically to the rotation surface along the rotation axis of a rotator, and the measuring result of the angular velocity can be directly read. The system of the invention is simple in structure and easy to operate, and has great progress compared with the prior art.

The invention mainly relates to a design method for enhancing seismic waves to stimulate illumination in a complex structure region. The design method comprises the following steps that (1) exploration area data are collected, a geological model of the complex structure region is established, and a geological target is determined; (2) an artificial seismic source is arranged at the target position, and illumination simulation is conducted through a wave equation forward modeling method; (3) statistics of illumination energy, upwards spread to the ground surface, of the seismic waves is conducted when illumination simulation is conducted; (4) an optimal encryption shot region on the ground surface is determined according to the statistical result of the illumination energy on the ground surface; (5) the main direction of emergence, on the ground surface, of the seismic waves stimulated by a target seismic source is calculated through a poynting vector, and the spread direction of a seismic wave beam stimulated by a phase-controlled seismic source is determined; (6) combined stimulation parameters of the phase-controlled seismic source are designed on the basis of a phase-controlled theory and the theoretical signal-to-noise ratio maximization principle of combined seismic sources; (7) a construction scheme for enhancing the illumination energy provided by the seismic waves for the target on the ground surface in the complex structure region is determined. The design method is good in application effect and can reduce the collection cost.

The invention discloses a method and an apparatus for determining a poynting vector of a seismic wave field and a computer storage medium. The method comprises the following steps: establishing an underground shot point forward-propagation wave field and a detection point back-propagation wave field; determining a medium type of the forward-propagation wave field and the back-propagation wave field; when the media are isotropic media, performing vertical-horizontal wave field separation on the forward-propagation wave field and the back-propagation wave field according to a preset equation decoupling algorithm, and when the media are heterogeneous anisotropic media, performing longitudinal-horizontal wave field separation on the forward-propagation wave field and/or back-propagation wave field according to a preset variation function IDW interpolation algorithm; decomposing a separated longitudinal-wave wave field and/or a transverse-wave wave field in a top direction, a bottom direction, a left direction and a right direction, and obtaining multiple directional-wave wave fields; and selecting multiple directional-wave wave fields from the multiple directional-wave wave fields, and calculating the poynting vector of the multiple directional-wave wave fields. By adopting the method, the poynting vector of each decomposed directional wave field can be calculated, so that more accurate angle-domain imaging gather can be obtained, and the imaging quality can be improved.

An apparatus for generating plasma, including a quadrupole antenna having a center region and an outer region and configured to be disposed over a dielectric window of a plasma chamber. The quadrupole antenna including a first coil defining a first SDA and a second coil defining a second SDA, the first coil being in a nested arrangement within the second coil. The nested arrangement places a turn of the first coil to be adjacent to a corresponding turn of the second coil as the first and second coils spiral from the center region to the outer region of the quadrupole antenna. Adjacent turns of each of the first and second coils are horizontally separated from one another by a distance when disposed over the dielectric window.

The invention provides an elastic wave vector imaging method and device, a storage medium and an apparatus. The method comprises the steps of building a conversion relation between group angles and polarizing angles by using the P wave speed of a set direction of an anisotropic medium of each point in an imaging area, the S wave speed of each set direction and anisotropic parameters; using an elastic wave equation to perform wave field depth prolongation of multi-component earthquake data in the imaging area to obtain a focus forward propagation wave field and a shot record back propagation wave field and corresponding Poynting vectors; according to set time intervals, decomposing the focus forward propagation wave field and the shot record back propagation wave field by using the Poyntingvectors and the conversion relation between group angles and polarizing angles; performing vector imaging of elastic waves in anisotropic media by using wave field decomposition results correspondingto all shots in the multi-component earthquake data. The imaging efficiency and accuracy can be improved.

The invention discloses an infrared absorber based on a dielectric microcolumn array and a preparation method thereof. The infrared absorber includes a dielectric microcolumn array, a dielectric layer, and a metal layer, the dielectric microcolumn array is used to screen the wavelength of the incident light, the dielectric layer is used to enable the screened incident light to generate the electromagnetic wave, and the metal layer is used to convert the electromagnetic wave into the thermal energy for absorption. The infrared absorber has the advantages of high quality factor and narrow absorption peak width. When the column height is 630nm-1210nm, the column diameter is 809nm-1980nm, the center distance of the two adjacent columns is 1300nm-3600nm, and the thickness of the dielectric layer is 1030nm-2310nm, the Poynting vector of the dielectric microcolumn array surface is zero, and the absorption peak wavelength is independent of the incident angle within a certain range, the absorber quality factor can be higher than 100, and a narrow absorption peak bandwidth can be realized.

The invention discloses an electromagnetic vector array based angle estimation method for metric-wave radar. The method is realized through adopting the following steps: (1), receiving radar return through adopting the electromagnetic vector array, and mixing the radar return to a base band for discrete sampling; (2), building a second-order statistical matrix through data obtained from the discrete sampling; (3), performing singular value resolving for the second-order statistical matrix, so as to obtain a left signal characteristic matrix; (4), building a pencil of matrix through utilizing the left signal characteristic matrix; (5), performing extended-feature value resolving for the pencil of matrix, so as to obtain an extended-feature vector matrix, an extended-feature value matrix and an extended-feature value, and calculating a poynting vector of a radar return signal through adopting the parameters; and (6), calculating a two-dimensional angle of an object as per the obtained extended-feature value and the poynting vector of the radar return signal. Under the circumstance that the one-dimensional linear array is adopted, the method can be used for estimating the two-dimensional angle, has the array element spacing larger than the half wavelength, has small computation, facilitates engineering realization, and can be used for the estimation of the two-dimensional angle of the object through the metric-wave radar.

The invention relates to a Poynting vector-based target near-field like-polarized scattering characteristic calibration method. The Poynting vector-based target near-field like-polarized scattering characteristic calibration method comprises the steps of S1, acquiring scattering total field characteristic of a metal ball under different distances by simulation calculation and by a MoM method; S2,acquiring incident field characteristic under different distances by simulation calculation and by the MoM method in the absence of metal ball; S3, acquiring characteristic of an emission field of themetal ball changing with the distances; S4, acquiring near-field scattering energy and incident field energy of the metal ball under different distances; S5, calibrating characteristic of near-fieldscattering RCS of the metal ball changing with the distances; and S6, introducing a large-number fitting method to obtain a near-field scattering RCS fitting formula of the metal ball under differentdistances. By accurate moment method and a Poynting vector theory, the near-field scattering characteristic of the metal ball target with different distance under planar wave excitation is acquired, and a foundation is provided for subsequent calibration of different detectors on target scattering RCS.

The present invention discloses systems and methods for electromagnetic field spacecraft propulsion. The system includes reaction thrust assemblies comprising conductor coils with alternating segments of magnetic field shield assemblies. Unshielded reaction thrust assembly segments are bracketed by field activation coils generating shaped magnetic fields. The action of the magnetic fields on currents in the unshielded coil segments of the reaction thrust assemblies produce unidirectional Lorentz Forces, thereby generating thrust without reaction mass, while reaction momentum is carried away by Poynting Vector fields in conformity with the currently understood principles of electrodynamics.

The present invention discloses a pulsed electric field propulsion system for spacecraft. The system includes a capacitor stack comprising an array of supercapacitors. Solid-state electronic circuits generate high time-rate-of-change currents and pulsed electric fields in pulse coils. The pulse coils direct the electric fields onto separated electric charges stored in the capacitor stack. The resulting unidirectional Lorentz Forces thereby generate thrust without reaction mass. Reaction momentum is carried away by Poynting Vector fields in conformity with the currently understood principles of electrodynamics. The design is scalable down to micro-chip sized thrusters.

The invention relates to a salt-cavern gas storage liquid level measuring system and method based on Poynting vector detection. The system comprises a central pipe, an electromagnetic signal transmitting device, electric field measuring devices, a magnetic field measuring device and a ground host. The central pipe is inserted into a salt-cavern gas storage from a wellhead; the electromagnetic signal transmitting device is arranged on the central pipe; the two electric field measuring devices are respectively arranged on the upper side and the lower side of the electromagnetic signal transmitting device; and the magnetic field measuring device is arranged below the lower electric field measuring device. The electromagnetic signal transmitting device excites an electric field and a magnetic field in a space, and the electric field measuring devices and the magnetic field measuring device measure the electric field and the magnetic field in the space. The ground host calculates the distance between the liquid level and the electromagnetic signal transmitting device through the measured electric field intensity and magnetic field intensity. The scheme can adapt to the severe environment in the gas storage, and the gas-liquid interface height in the gas storage can be accurately measured.

A determination is made of frequency components associated with a particular bearing or location resulting from sources emitting electromagnetic-wave energy for which a Poynting-Vector can be defined. The broadband frequency components associated with a specific direction or location of interest are isolated from other components in the power spectrum that are not associated with the direction or location of interest. The collection of pointing vectors can be used to characterize the source.

The invention relates to a correlation weighted reverse time migration imaging method based on wave field separation. The method belongs to the field of seismic migration imaging, and specifically comprises the following steps: in a reverse time migration imaging process, firstly realizing wave field separation of a seismic source wave field and a detection point wave field based on a Poynting vector, and obtaining upper left, lower left, upper right and right down waves of the seismic source wave field and the detection point wave field and corresponding 16 wave field separation imaging profiles; and then performing correlation processing on the 16 wave field separation imaging results and a reference profile (namely a conventional reverse time migration imaging result based on wave field separation); finally, by using the obtained correlation value as a weight to be respectively endowed with an imaging result of each wave field separation, completing the correlation weighted reverse time migration imaging based on the wave field separation. Model experiment results show that compared with a conventional reverse time migration method based on wave field separation, the method does not need to carry out manual selection and rejection on imaging results after wave field separation, and the imaging precision of reverse time migration can be remarkably improved.

A method for producing a tunable non-gradient optical force on the surface of a liquid crystal material and metal multi-layer core-housing by slanting incidence-light is provided. The method comprising destroying symmetric distribution of Poynting vectors around the multi-layer core-housing, enabling a total Poynting vector on the multi-layer core-housing not to be zero and producing a non-gradient optical force; and then, by changing an arranging direction (the direction of a liquid crystal molecular axis) of liquid crystal molecules in liquid crystal materials, changing the direction and the size of the total Poynting vector on the multi-layer core-housing, thus changing the direction and the size of the non-gradient optical force acted on the multi-layer core-housing by the total Poynting vector thus to regulate a moving track of the multi-layer core-housing in an incidence light field, and carrying out tunable capture and screening on nanoscale molecules adhered onto the surface of the multi-layer core-housing. Through methods such as illumination, electrification, heating and pressurization, the direction of the liquid crystal molecular axis of the liquid crystal materials in the liquid crystal material/metal multi-layer core-housing is altered.

Provided is a method for capturing and screening graphene-coated particles above a substrate in a tunable manner through linearly-polarized planar optical wave, comprising the following steps: placing graphene-coated particles above a substrate slab, damaging the symmetric distribution of a Poynting vector around the graphene-coated particles, making the total Poynting vector on the graphene-coated particles not be zero, and producing a non-gradient optical force; and then, changing the direction and size of the total Poynting vector on the graphene-coated particles by changing the Fermi energy level of graphene, and further changing the direction and size of the non-gradient optical force applied by the total Poynting vector to the graphene-coated particles to adjust the motion trajectory of the graphene-coated particles in an incident light field, wherein the Fermi energy level of graphene is changed by changing an external electric field, temperature, intensity of injected light, thickness of graphene, and the like, and further, the dielectric coefficient and conductivity of graphene are changed.