218 results about "Total field" patented technology

The invention relates to a travelling risk field-based automobile driving safety assistance method which comprises the steps of (1) establishing a travelling risk field unified model according to the combined action of all factors of people, automobiles and roads in the ambient environment for the travelling risk; (2) establishing a self automobile travelling risk field model by building a mathematical model of the kinetic energy field, the potential energy field and the behavior field of objects in the ambient environment, and calculating the total field intensity of the travelling risk field of a self automobile; (3) calculating the acting force applied to the self automobile in the travelling risk field based on the total field intensity of the travelling risk field; (4) calculating the travelling risk factor of the self automobile according to the acting force applied to the self automobile in the travelling risk field, and carrying out safety assistance in the travelling process based on the risk factor. The method is suitable for decision of driving safety assistance in the complex environment and the route planning of an intelligent vehicle.

The present invention is whole particle field measuring method and equipment based on laminar laser imaging and features that particles in test flow field are illuminated with orthogonal laminar laser beams and two CCD cameras are used to take the particle motion locus images both in the direction perpendicular to the flow field and in the direction parallel to the flow field separately. The equivalent diameters of particles are determined via particle image distinction and statistical analysis of covered pixels, and the particle motion speeds, including magnitudes and directions, are determined via the distinction and analysis of particle motion locus image, so as to obtain the size spectrum and speed field distribution of particles in the imaging plane. The present invention needs no addition of tracing particle, and may be used widely in the two-phase and multi-phase flow field measurement in various fields.

Virtual images are located for display in a head-mounted display (HMD) to provide an augment reality view to an HMD wearer. Sensor data may be collected from on-board sensors provided on an HMD. Additionally, other day may be collected from external sources. Based on the collected sensor data and other data, the position and rotation of the HMD wearer's head relative to the HMD wearer's body and surrounding environment may be determined. After resolving the HMD wearer's head position, the HMD wearer's total field of view (TFOV) may be classified into regions. Virtual images may then be located in the classified TFOV regions to locate the virtual images relative to the HMD wearer's body and surrounding environment.

The invention relates to an aerial magnetic force detection device and an aerial magnetic force detection method based on an unmanned aerial vehicle. The aerial magnetic force detection device comprises an aerial magnetometer system, an unmanned aerial vehicle flying platform, an onboard data collection system and an onboard GPS (global positioning system). The aerial magnetometer system comprises a total-field magnetometer and a three-component magnetometer, wherein the total-field magnetometer is used for measuring earth magnetic fields and the three-component magnetometer is used for measuring attitudes of the unmanned aerial vehicle. The onboard data collection system comprises a master control module, a total-field magnetometer collection module, a three-component magnetometer collection module, a GPS module, an A/D (analog to digital) collection card, a state display module and a storage module. The aerial magnetic force detection device and the aerial magnetic force detection method have the advantages that large manned aerial vehicles are not needed, aeromagnetic survey cost is reduced, the device and the method are applicable to magnetic force detection of the borderland, where vehicles and ships cannot reach, between land and shallow sea, and low cost, high safety and the like are achieved.

The invention provides a magnetic target tracking method based on a magnetic anomaly gradient. Through carrying out matrix transformation on the magnetic anomaly gradient, a unit direction vector of a target magnetic moment is separated, an optimization problem is formulated to estimate the position and magnetic parameters of the target, and through constructing a special fitness function, a particle swarm optimization algorithm is used to solve the target parameters. According to the target tracking method based on the magnetic anomaly gradient, a new idea is provided for target positioning by using geomagnetic total field information, the method can solve the information of moving target velocity, and certain reference meaning is realized in positioning and tracking of the magnetic target.

An airborne exploration system used with an aircraft for shallow and deep exploration for oil and gas, mineral deposits and aquifers. The survey system uses natural electromagnetic EM fields as an energy source. The exploration system includes a pair of aerodynamic housing pods adapted for mounting on wing tips of the aircraft. The housing pods include electric field sensors with three orthogonal electric dipoles oriented along an X, Y and Z axis. An optional third set of orthogonal electric dipoles can be mounted in the tail of the aircraft. The field sensors are electrically attached to angular motion detectors mounted inside housing pods. The motion detectors are used for compensating for errors caused by angular motion of the aircraft when in the presence of strong electric field gradients. The system also includes a total field magnetometer mounted in the aircraft. The various filtered outputs of the magnetometer are used to provide phase and amplitude references for the similarly filtered and angular motion corrected outputs of the electric field sensors. The electric field data when normalized and phase referenced against the magnetic field data provides valuable geological and geophysical information related to the subsurface flow of telluric currents.

The method of the invention includes that a spin triplet state electronic ground state based on a diamond NV color center uses the diamond NV color center as a sensitive component under different magnetic field conditions, and the NV color center is excited by the laser 532 nm; the NV color center emits fluorescence through external microwave, and further, an ODMR spectrum is obtained. Three pairsof distinct Zeeman split peaks can be extracted from the spectrum, and the resonance frequency difference between each pair of peaks is measured. The three different frequency differences come from three different NV directions, and the magnitudes of the three frequency differences are proportional to the magnetic field strength along projections of three symmetry axes in the NV color center, andthe three orientations is sufficient to extract three components of the magnetic field, which is the total field strength in this state. The measured weak magnetic field of the magnetized permalloy is obtained by subtracting the known magnetic field from the total field strength. Furthermore, the detection of the weak magnetic field of the local spin triplet state electronic ground state based onthe diamond NV color center is realized.

A high-accuracy geomagnetic vector measurement method is characterized in that a vertical additional magnetic field and a horizontal additional magnetic field which have the same intensity but different directions are added to the position of a probe of a high-accuracy total-field magnetometer; a geomagnetic field without additional magnetic fields and a resultant magnetic field with an additional forward magnetic field and an additional reversed magnetic field are measured respectively; and then, each component, including a vertical component Z, a horizontal component H, a geomagnetic inclination I and a declination D, of a geomagnetic vector can be computed, and the method is suitable for fast and high-accuracy geomagnetic vector measurement outdoors or in a fixed station. According to the method, the geomagnetic vector measuring accuracy is in positive correlation with the accuracy of the matched magnetometer, and the high-accuracy total-field magnetometer is superior to a fluxgate three-component magnetometer with 10 nT of measuring errors. A high-accuracy geomagnetic vector field measurement device comprises one group or two groups of field coils and a tripod, the field coils are added to the outside of the high-accuracy total-field magnetometer probe, and the field measurement device is matched with the high-accuracy total-field magnetometer and used for rapidly measuring each component of the geomagnetic vector outdoors or in the fixed station.

A device described here includes a housing and a multi-aperture imaging device. The multi-aperture imaging device includes an array of optical channels arranged next to one another and a beam-deflector for deflecting an optical path of the optical channels. In a first operating state of the device, the housing encloses a housing volume. In the first operating state of the device, the beam-deflector includes a first position within the housing volume. In a second operating state of the device, the beam-deflector includes a second position where the beam-deflector is arranged at least partly outside the housing volume.

Systems and methods for transmitting and receiving radio waves includes a parabolic dish, a focal plane antenna array configuration antenna elements arranged in a circular array configuration with array elements positioned along circumference of rings with a distance between each element and coupled a focal disc positioned along a focal plane of the parabolic dish. The array is configured to transmit and receive radio beam patterns with one or more Orbital Angular Momentum states ‘l’ via a transceiver feed assembly. The transceiver includes a transmitter adapted to alter excitation phase of the radio beams of successive elements and generate helical wave fronts in the far-field, and a receiver to enhance the received wave fronts. A total field received by the array configuration is then calculated by a superposition of the fields received by each of the elements.

The invention pertains to the field of geophysical exploration and oilfield development technology, is a transient electromagnetic method for determining the reservoir pore anisotropy and comprises the following steps: an earthing conductor is taken as a driving source which deviates from a measuring line x direction to form a deflection angle Phi0, and two electric field components Ex and Ey orthometric each other are measured and recorded; the formation resistivity of x direction and y direction at different depth are obtained by refutation; an amplitude value of the horizontal component of electric field total field vector, an electric field anisotropy coefficient and an azimuth of an electric field principal axis vector are counted; the formation porosity value on the direction of electric property principal axis is obtained by the resistivity value on the direction of electric property principal axis; a vector arrow diagram is drawn, the length of the arrow shows the magnitude of the formation porosity or the resistivity on the direction of electric property principal axis, the pointedness of the vector arrow and the azimuth of a source dipole are both formation porosity isotropic; and the vector arrow deviated from the electric property principal axis is formation porosity anisotropy. The invention can determine pore distribution, lithology changing, local anomaly and local metamorphism in the formation porosity.

The invention relates to a borehole wall sloughing analysis method which comprises the steps of parameter collection and input (1), initial stress processing (2), first time of stress release (3), first step of second time of stress release (4A), second step of second time of stress release (4B), characteristic value evaluation (5), generalized force and generalized displacement (6), path curve balancing (7), and collapse pressure processing (8). Evaluation is conducted according to a minimum obtained characteristic value (Mu1) m, and when the minimum obtained characteristic value (Mu1) m is more than 0, if m is less than M, m plus 1 arrows m, thus entering the second step of the second time of the stress release (4B); otherwise, a total field is obtained; when the minimum characteristic value (Mu1) m is less than 0, a disturbance field is calculated according to an interpolation method; and the collapse pressure qcr and a plastic area distribution area corresponding to the qcr are calculated, so as to determine the density of collapse prevention drilling fluid. The borehole wall sloughing analysis method has the effect of being capable of analyzing the borehole wall stability of a strain softening plastic stratum under the condition of non-uniform ground stress; and the density of the collapse prevention drilling fluid is designed, thus playing the role of protecting a reservoir stratum during on-site drilling.

The invention discloses a method for detecting coupling response of a cable under the excitation of electromagnetic wave, which comprises the following steps: introducing an equivalent radiation source Si (Gi, Li,), the excitation Gi(gi, phi i) of the equivalent radiation source and cable border KL(1, a, D, sigma, epsilon, mu) into a numerical analysis platform of an electromagnetic field; and analyzing the introduced sources to obtain the current electromagnetic wave total field information Ei(ei, theta i). The invention combines an HFSS platform with a correction Taylor model (see the formula enclosed in the right drawing) under the radiation of a single interference source so as to obtain the terminal response of a cable used for connecting with two interfered devices under the radiation of electromagnetic waves generated by a plurality of interference devices. The method can be used for predicting the coupling response state of a cable under the excitation of incident electromagnetic wave so as to provide reference information for device level and system level electromagnetic compatibility designs.

The invention provides a method of eliminating influence of a carrier magnetizing field on geomagnetic measurement. The method is characterized in that two magnetic sensor linear arrays are carried on a carrier, a non-magnetic anomaly point A with a mild magnetic field change is selected within the scope of a space to be measured, a geomagnetic total field of the point A is measured under the carrier-free condition by utilizing an independent magnetic sensor, the carrier carried with the two magnetic sensor linear arrays is placed on the point A, a geometric center of the linear array is taken as an axis, the carrier is slowly rotated at a constant speed for one circle, a geomagnetic field value and the corresponding rotating angle are respectively continuously measured by the two magnetic sensors, the corresponding function curve of a difference and an angle is made, the geomagnetic total field on the point is subtracted by the magnetic field value of the linear array magnetic sensor, and the actual measurement geomagnetic field in the whole space to be measured is used for compensating the influence of the carrier magnetizing magnetic field. According to the invention, the linear array is formed by the two magnetic sensors, and a demagnetization method and a demagnetization algorithm of the rotating linear array are provided for complicated influence of the carrier on the magnetic measurement, so that the influence of the carrier on geomagnetic measurement is completed eliminated.

In a method and a device for specific absorption rate monitoring in a magnetic resonance system wherein multiple transmit coils are independently charged with respective currents, a primary model point voxel and at least one auxiliary model point voxel are automatically selected from among multiple voxels that model a modeled examination subject. The primary model point voxel is that voxel in which an absolute maximum of a total field variable occurs that is produced by the respective electrical fields emitted by the transmit coils. The at least one auxiliary model point voxel is that voxel in which a relative maximum of the variable occurs. The primary model point voxel and the at least one auxiliary model point voxel are stored, and specific absorption rate monitoring of an actual examination subject in the magnetic resonance system is implemented during the acquisition of magnetic resonance data in respective voxels of the actual examination subject corresponding to the stored primary model point voxel and the stored at least one auxiliary model point voxel.

The invention provides a laser radar, comprising multiple transceiving modules and at least one scanning module, the multiple transceiving modules are used for transmitting a pulse laser beam and receiving an echo signal, reflected by a to-be-detected target, of the pulse laser beam, and the at least one scanning module is used for reflecting the pulse laser beam transmitted by the multiple transceiving modules to a three-dimensional space and is also used for reflecting the echo signal to a corresponding transceiving module; the multiple transceiving modules are horizontally arranged side byside, the scanning module is located at one side of the multiple transceiving modules, emergent surfaces of the multiple transceiving modules are respectively towards the at least scanning module, each transceiving module accordingly detects one sub scanning field of view, and multiple sub scanning fields of view form a total field of view of the laser radar through splicing of the fields of view.The laser radar provided by the invention has the advantages that a scanning field of view of the whole laser radar is increased by utilizing and splicing the multiple sub scanning fields of view; each transmitting module comprises multiple light sources which are arranged in a vertical direction at intervals, so that linear density of a scanning trace of a vertical field of view is effectively increased; and multiple light sources adopt time-sharing transmitting, so that interference of a receiving light path is reduced.

A structure of interest is irradiated with radiation for example in the x-ray or EUV waveband, and scattered radiation is detected by a detector (306). A processor (308) calculates a property such as linewidth (CD) by simulating interaction of radiation with a structure and comparing the simulated interaction with the detected radiation. A layered structure model (600, 610) is used to represent the structure in a numerical method. The structure model defines for each layer of the structure a homogeneous background permittivity and for at least one layer a non-homogeneous contrast permittivity. The method uses Maxwell's equation in Born approximation, whereby a product of the contrast permittivity and the total field is approximated by a product of the contrast permittivity and the background field. A computation complexity is reduced by several orders of magnitude compared with known methods.

A method for electromagnetic geophysical surveying of rock formations (1) under a sea-floor (3) comprising the following steps: * —towing first and second alternating field (E₁, E₂) emitting sources (s₁, S₂) in first and second depths below the sea surface, said first field (E₁) having a first phase (Φ₁); —said second alternating field (E₂) given a second phase (Φ₂) different from said first phase (Φ₁), said sources (S₁, S₂) constituting a phased array emitter antenna with directivity for transmitting a major proportion of the combined electromagnetic energy downwards; —said first and second fields (E₁, E₂) for propagating partly down through the sea-floor (3) and being reflected and/or refracted through said rock formations (1) and partly propagating back through the seafloor (3); —said first and said second fields (E₁, E₂) for merging to a total field and being measured by electromagnetic receivers (r₁, r₂, . . . , r_n) recording corresponding field registrations (E_r1(t), E_r2(t), E_r3(t), . . . , E_rn(t)).

The invention provides an irregular terrain radio wave propagation factor prediction method based on a three-dimensional parabolic equation for solving the problem that a two-dimensional parabolic equation cannot consider the influence of transverse terrain to radio wave propagation properties. The irregular terrain radio wave propagation factor prediction method comprises the following steps: establishing a three-dimensional irregular terrain geometric model by using a digital elevation map; deducing a wide angle parabolic equation expressed by a bit function by using a maxwell equation; figuring out an initial field of the wide angle parabolic equation by using a current distribution function of an excitation source; figuring out the wide angle parabolic equation by using an improved step-by-step Fourier transform method to obtain a total field of the wide angle parabolic equation; constructing an attenuation function in a whole space, and correcting the amplitude of the total fieldof the wide angle parabolic equation; and calculating an irregular terrain radio wave propagation factor by using the total field of the wide angle parabolic equation considering the absorption boundary. By adoption of the irregular terrain radio wave propagation factor prediction method, the precision of prediction of the three-dimensional parabolic equation is improved, the application range ofthe digital elevation map is expanded, and the irregular terrain radio wave propagation factor prediction method can be applied to wireless communication and GPS positioning in complex environments.

A device and method for depolarising the total field of a wavelength division multiplexed (WDM) signal is provided. A polarisation maintaining multiplexor combines a plurality of optical signals to form a polarised multiplexed signal. The multiplexed signal is then passed through a differential group delay (DGD) element adapted to modify the polarisation state of one or more optical source signals within the multiplexed signal and thereby to at least partially depolarise the multiplexed signal.