247 results about "Field point" patented technology

Methods, systems, and articles of manufacture consistent with the present invention provide for determining the orientation of natural fractures in the Earth resulting from hydraulic fracturing treatment. Data attribute information from a far-field point-source signal profile for a microseismic event is extracted in the time domain. An estimate of the orientation of the natural fracture is calculated in the time domain based on the extracted data attribute information.

A floating point unit is provided with a register bank comprising 32 registers that may be used as either vector registers of scalar registers. A data processing instruction includes at least one register specifying field pointing to a register containing a data value to be used in that operation. An increase in the instruction bit space available to encode more opcodes or to allow for more registers is provided by encoding whether a register is to be treated as a vector or a scalar within the register field itself. Further, the register field for one register of the instruction may encode whether another register is a vector or a scalar. The registers can be initially accessed using the values within the register fields of the instruction independently of the opcode allowing for easier decode.

A multiscale telescopic imaging system is disclosed. The system includes an objective lens, having a wide field of view, which forms an intermediate image of a scene at a substantially spherical image surface. A plurality of microcameras in a microcamera array relay image portions of the intermediate image onto their respective focal-plane arrays, while simultaneously correcting at least one localized aberration in their respective image portions. The microcameras in the microcamera array are arranged such that the fields of view of adjacent microcameras overlap enabling field points of the intermediate image to be relayed by multiple microcameras. The microcamera array and objective lens are arranged such that light from the scene can reach the objective lens while mitigating deleterious effects such as obscuration and vignetting.

A device and a method for wavefront measurement of an optical imaging system, and a microlithography projection exposure machine that is equipped with such a device. The device has a wavefront generating unit that includes an optical element (1) with an object-side periodic structure (2), and a light source unit (20,21) for illuminating the object-side periodic structure with the aid of a measuring radiation. The device also has a detector unit that is arranged on the image side of the imaging system to be measured and that includes an optical element (3) with an image-side periodic structure, and a detector element (52, 52a, 52b) for detecting an overlay pattern of the imaged object-side periodic structure and image-side periodic structure. The wavefront generating unit is designed to restrict the angular spectrum (6) of the measuring radiation emanating from a respective field point (7), the design being such that the measuring radiation emanating from the respective field point illuminates only in each case a specific subregion of a pupil plane of the optical imaging system.

A projection exposure tool (10) for microlithography with a measuring apparatus (36) disposed in an optical path (28) of the projection exposure tool (10) for the locally and angularly resolved measurement of an irradiation strength distribution. The measuring apparatus (36) includes a measuring field with an arrangement (56) of focusing optical elements (42) disposed at respective individual points of the measuring field (41), a common image plane (44) for the focusing optical elements (42), a locally resolving radiation detector (46) with a recording surface (48) for the locally resolved recording of a radiation intensity, the recording surface (48) being disposed in the common image plane (44), and the radiation detector outputting radiation intensity signals for a plurality of angle values indicative of a respective angularly resolved irradiation strength distribution for at least one of the individual measuring field points.

The invention discloses a designing method for a gradient coil of a self-shielding superconductive nuclear magnetic resonance imaging system.The designing method comprises the steps that firstly, three-dimensional continuous triangular mesh dividing is performed on a main coil framework region and a shielding coil framework region, and an axial magnetic induction intensity coefficient matrix generated by mesh nodes in the main coil framework region and the shielding coil framework region on a target field point is calculated according to a boundary elements method; secondly, an optimization calculation model is built through a regularization method, wherein the optimization calculation model comprises two parts, the first part is deviation between the axial magnetic induction intensity generated by the mesh nodes in the main coil framework region and the shielding coil framework region on a target field point and the expected target magnetic induction intensity, the second part is the quadratic sum of the flow function curvature of the mesh nodes, and flow function values of the mesh nodes in the main coil framework region and the shielding coil framework region are obtained through solution; lastly, actual winding distribution of the gradient coil is obtained through a flow function method.

The present invention is a turbine tip arrowhead, used either strictly as a field point or as the forwardmost tip in conjunction with any prior art broadhead assembly. The key feature of this turbine tip is the geometry, which includes a tapered tip and a plurality of helical rifles, consisting of either grooves or ridges, beginning at the tip of the field point and spiraling back towards the aft end. All rifles spiral in the same rotational direction giving the appearance of a turbine. This turbine tip design provides excellent rotation of the arrow shaft during flight without producing a large amount of aerodynamic drag. The invention is compatible with all contemporary arrow shafts and with all contemporary broadhead assemblies. A novel broadhead assembly utilizing the turbine tip and deployable blades to produce axial rotation is also described.

The invention discloses a bilateral filtering de-noising method of point cloud data based on KDTree when a ground laser scanning technology is used to carry out measured object surface reconstruction. In a bilateral filtering algorithm, a scattered point cloud data point field is established through the KDTree so as to obtain a field point set of the data point. An inverse iteration method is used to calculate the field point so as to obtain a normal vector ni. A filtering function parameter and a filtering Gauss parameter are calculated so as to obtain a bilateral filtering power factor lambda. Finally, a new data point after the filtering can be obtained, wherein the new data point p'i=pi+ lambdani. The bilateral filtering method of the invention is used to filter the noise of the point cloud data. The method is simple and effective. An operation speed is fast. A characteristic can be maintained and simultaneously the noise can be removed. The method is suitable for processing the noise in a small scope.

The invention discloses a finite difference design method of a magnatic resonance imaging (MRI) system gradient coil, which comprises the following steps: firstly, dividing finite difference grids in the coil space, and establishing finite difference relation between a node stream function and grid current density on each grid node; subsequently, selecting a constraint field point in the magnetic field related region of the MRI system gradient coil, and computing the magnetic induction intensity on the constraint field point according to the design requirements; then, establishing a system of linear equations between the node stream function and the magnetic induction intensity of the constraint field point according to the Biot-Savart law; simultaneously, establishing a penalty function of the system of linear equations according to the actual engineering requirements; and finally, solving the system of linear equations by a method of regularization to acquire a node stream function value, and determining the current style of the coil by a constant stream function line. The invention is simple and effective and can be suitable for designing gradient coil systems in any structure.

A rapid disperse three-dimensional point cloud filtering method is characterized in that the point cloud filtering method comprises the following steps: 1) obtaining a disperse point cloud of a three-dimensional object by utilizing a fixed depth camera; 2) establishing a three-dimensional voxel grid for point cloud data, all points in the voxel grid being expressed by a gravity point finally; 3) calculating the mean value and variance of global distance of the disperse point cloud; 4) calculating threshold value of global distance of the disperse point cloud; and 5) calculating average distance between a certain point and field points of the certain point and judging the relationship between the certain point and the global distance threshold value. The advantages of the method are that the mass discrete point cloud data can be rapidly and effectively compressed and filtered; nonuniformity of the density of the point cloud data can be effectively improved; and outliers beyond reference range can be rapidly removed.

The invention discloses a method for reestablishing a transient sound field. The method is characterized by comprising the following steps of: setting a holographic surface H in a sound field to be measured, and uniformly distributing M measuring points on the holographic surface H; synchronously measuring sound pressure signals of the M measuring points positioned on the holographic surface H to obtain the time domain sound pressure of the M measuring points by adopting M microphones; setting a virtual source surface S<*> within a sound source surface S, and distributing N time domain equivalent sources on the virtual source surface S<*>; carrying out interpolation processing on the time domain sound pressure of the M measuring points by adopting linear interpolation functions, and establishing the transitive relation between the time domain sound pressure of the M measuring points positioned on the holographic surface H and M time domain equivalent sources at any time; starting to sequentially acquiring the source intensity of the time domain equivalent sources at corresponding times from an initial time; and reestablishing the time domain sound pressure of any field point according to the acquired source intensity of the time domain equivalent sources at all times and the transitive relation between the time domain equivalent sources and any field point. The method disclosed by the invention has the advantages of good computational stability, high accuracy, high speed and easiness for implementation and is especially suitable for reestablishing the transient sound field generated under the action of transient exciting force.

The invention discloses a numerical control machine processing online measurement method. The method can realize online measurement of large workpieces. A binocular stereo vision measurement system is combined with a numerical control machine to complete integral measurement of the large workpieces under the traction of the numerical control machine. The method comprises the following steps of: calibrating internal and external parameters of a camera, and combining the measurement system and the numerical control machine; performing translation calibration and rotary calibration to calibrate direction vectors of X-axis and Y-axis of the numerical control machine and rotary matrix R and translation vector T after the measurement system rotates; dragging the measurement system to move by the numerical control machine to perform single view field scanning till traversing all surfaces of a measured workpiece; and finally, performing integral joint according to all view field point cloud data and the reading of a main shaft of the numerical control machine so as to complete integral measurement of the workpiece. The method has the characteristics of flexible use, convenience, high precision and the like, and can be used for online measurement of the large workpieces on an industrial site.

A projection exposure apparatus for microlithography using a wavelength<=193 nm, includes (A) a primary light source, (B) an illumination system having (1) an image plane, (2) a plurality of raster elements for receiving light from the primary light source, and (3) a field mirror for receiving the light from the plurality of raster elements and for forming an arc-shaped field having a plurality of field points in the image plane, and (C) a projection objective. The illumination system has a principle ray associated with each of the plurality of field points thus defining a plurality of principle rays. The plurality of principle rays run divergently into the projection objective.

The invention discloses a land and air transient electromagnetism exploring method based on the combined magnetism source technology. The land and air transient electromagnetism exploring technology based on the combined source technology is firstly put forward in the method, specifically, 4 or 6 or 8 magnetism sources are arranged on a large circumference of the ground with the exploration target area as the center at equal intervals, and an unmanned aerial vehicle above the exploration area is used for collecting induced electromotive force transient responses excited by all combinations. Due to the fact that the adopted combination sources are multiple sources and are symmetrically distributed, the problems that the response result range difference, brought by a fixed source between a far-field point and a near-field point is large, and the position of partial asymmetry body is explained uncertainly are greatly solved, the multi-angle observation information of an underground anomalous body can be obtained, the effect of the inversion multiplicity is reduced, and the complex area can be explored in an efficient, high-resolution, large-area and large-depth mode.

A catadioptric projection lens for imaging a pattern arranged in an object plane while creating a real intermediate image, having a catadioptric first lens section having a concave mirror and a beam-deflection device, as well as a dioptric second lens section that follows the catadioptric lens section, between its object plane and image plane. The beam-deflection device deflects radiation coming from the object plane to the concave mirror. Positive refractive power is arranged following the first reflective surface, between the latter and the concave mirror, within an optical near-field of the object plane, within which the height of the principal ray of the outermost field point of radiation coming from the object exceeds the marginal-ray height. The intermediate image is arranged prior to light which forms the intermediate image being reflected by a second reflective surface that is provided for the purpose of allowing arranging the object plane and image plane such that they will be parallel to one another.

The invention provides a method for analyzing space images of a high numerical aperture imaging system, which comprises the following steps of: initializing imaging object images into a matrix, wherein an element of the matrix is the transmissivity of an imaging object; rasterizing a partial correlated light source surface, taking each grid region as a point light source, and expressing the amplitude and the phase of the light source of the central point in the grid region by utilizing the amplitude and the phase of the light source of the central point of each region; calculating the distribution of a diffraction spectrum on an entrance pupil of an imaging system under a global coordinate system by utilizing a fourier optics theory; acquiring the imaging system; determining the distribution of the spectrum on an exit pupil of the imaging system under the global coordinate system; further determining the light intensity distribution on an image surface; and superposing the light intensity distribution on the image surface corresponding to all the point light sources, and determining the light intensity distribution on the image surface corresponding to a partial correlated light source. The method makes up the defect of analyzing view field point space images out of an axis of a high-NA (numerical aperture) imaging system by combining an imaging model of two-dimensional polarization aberration, and the method for analyzing the space images of the high numerical aperture imaging system is suitable for any high-NA imaging system.

The invention relates to a method for setting a seismic acquisition and observation system and belongs to the technical field of oil and gas seismic exploration. The method comprises the following steps: manufacturing a geologic model of a testing zone with undulating surface according to data provided by surveying and mapping and geological annotation data explored at the early stage; reversely spreading a seismic wave field along the geologic model by utilizing a reciprocity principle in the geologic model and taking a target reservoir stratum as a plane wave seismic focus; discretely solving wave equation by a staggered grid high-order finite difference numerical value simulation technology; processing the boundary of the undulating surface by a numerical value boundary absorption technology; calculating the illumination intensity distribution of the geologic model in the target zone; and optimally arranging the positions of the seismic focus point and the detection point by analyzing the illumination intensity of the earth surface. Compared with optimal observation system method such as a field point test and the like, the method provided by the invention is economic and practical, saves the construction cost, optimally analyzes the whole target zone and avoids blind zone and drain zone.

An illumination system (12) of a microlithographic exposure apparatus (10) comprises a condenser (601; 602; 603; 604; 605; 606) for transforming a pupil plane (54) into a field plane (62). The condenser has a lens group (L14, L15, L16, L17; L24, L25, L26, L27, L28; L34, L35, L36, L37; L44, L45, L46; L53, L54, L55) that contains a plurality of consecutive lenses. These lenses are arranged such that a light bundle (70) focused by the condenser (601; 602; 603; 604; 605) on an on-axis field point (72) converges within each lens of the lens group. At least one lens (L15, L16, L17; L25, L26; L34, L44, L45; L54) of the lens group has a concave surface. The illumination system may further comprise a field stop objective (66; 666, 666′) that at least partly corrects a residual pupil aberration of the condenser (601; 602; 603; 604; 605; 606).

The invention provides a traveling wave type ultrasound reaction vessel, which relates to a device for processing liquid by using the ultrasound cavitation effect. The traveling wave type ultrasound reaction vessel comprises a box body (3), at least one pair of ultrasound energy exchangers and an ultrasound energy exchanger driving circuit, wherein the box body (3) is used for containing liquid to be processed, each pair of ultrasound energy exchangers consists of a first energy exchanger (2) and a second energy exchanger (6) which are respectively arranged on the box wall in opposite directions, and ultrasound traveling waves are formed in the box body of the reaction vessel by the overlapping of ultrasound standing waves with the 90 degrees of phase difference on space and 90 degrees of phase difference on time. The sound reaction vessel uses a traveling wave ultrasound field for working. Although each field point has different time phases, each field point has the same sound pressure amplitude value in theory. Because the intensity of the sound cavitation effect in the liquid only depends on the sound pressure amplitude value, and is irrelevant with the phases of the sound pressure, the sound cavitation effect in the traveling wave ultrasound field is more uniform than that in the standing wave ultrasound field.

The invention relates to a projection objective which consists of at least seven lenses that are adjacent to air on both sides. The inventive projection objective meets the criteria of the following equations in its totality: u>=12.8°; 100 mm<=LEP<=400 mm; sigmaRBa>=1°; sigmaRBi<=-14°, whereby u is the aperture angle (2u-entire angle) on the illumination side; LEP is the distance from the entrance pupil (on the illumination side) to the object level (the position in the direction of projection from the reference point: object level corresponds to a positive value); sigmaRBa is the angle inclination of the beam in relation to the optical axis in the object space between the object and the 1. lens surface of the objective, said beam limiting the bundle for the field edge (outer field point in the object) towards the outside (away from the optical axis, far from the axis) and sigmaRBi is the angle inclination of the beam in relation to the optical axis in the object space between the object and the 1. lens surface of the objective, said beam limiting the bundle for the field edge (outer field point in the object) towards the inside (towards the optical axis, close to the axis). The angles sigmaRBa and sigmaRBi are positive when the corresponding beams intersect the optical axis in a point which is situated in the opposite direction of projection when seen from the object. Said angles are negative when the beams intersect the optical axis in a point which is situated in the direction of projection when seen from the object.

A method of driving a piezoelectric actuator including: a piezoelectric element containing a piezoelectric body having coercive field points on a negative field side and a positive field side respectively and having asymmetrical bipolar polarization—electric field hysteresis characteristics in which an absolute value of a coercive electric field on the negative field side and a coercive electric field value on the positive field side are mutually different, and a pair of electrodes for applying voltage to the piezoelectric body; and a diaphragm which externally transmits, as displacement, distortion produced in the piezoelectric body when the voltage is applied to the piezoelectric body, includes the step of driving the piezoelectric actuator between a positive drive voltage and a negative drive voltage in a range not exceeding the coercive electric field, from among the positive and negative coercive electric fields, which has the larger absolute value.