113 results about "Solid angle" patented technology

The invention discloses a phased array weather radar calibration method based on a generalized metal ball calibration theory. Comprising the following steps: in a microwave anechoic chamber, collecting two-dimensional antenna pattern data of a phased array weather radar in at least one working mode and pointing to a plurality of different beams; performing numerical integration on the two-dimensional antenna pattern data, calculating a combined beam main lobe solid angle of the transmitting antenna and the receiving antenna, and calculating an equivalent beam width product; calculating a calibration theoretical reflectivity factor of the metal ball based on the product of the theoretical radar scattering sectional area and the equivalent beam width of the metal ball; actual detection echo data of the phased array radar on the metal ball under different working modes and beam pointing is acquired, and an actual reflectivity factor is calculated; and comparing the actual reflectivity factor with the calibration theoretical reflectivity factor to complete calibration of the phased array weather radar. Aiming at the non-Gaussian working mode of the phased array weather radar, the reflectivity factor of the phased array weather radar can be quantitatively evaluated, and the radar detection performance is improved.

The present invention relates to an AR diffractive optical waveguide rainbow pattern testing device, which includes a Z-axis hollow rotary table, an A-axis rotary displacement table, a hollow waveguide carrier stage, an imaging brightness and chromaticity meter, and an optical generation module. By simulating the usage scenario of the diffractive optical waveguide in a hemispherical space, the present invention acquires and analyzes multi-dimensional information such as the brightness and chromaticity, azimuth angle, solid angle, and position of the rainbow pattern, and has the ability of calibration, achieving the effects of multi-dimensional and high-precision detection and analysis of the rainbow pattern and improving the repeated measurement accuracy.

The invention provides an optical fiber nutation coupling method, system and device based on an electro-optical crystal, and relates to the technical field of free space optical communication, and the device mainly comprises the electro-optical crystal, a convex lens, an optical fiber, a beam splitter, an optical power meter, a controller and a driver. The electro-optical crystal comprises a first electro-optical crystal and a second electro-optical crystal which are arranged in sequence, and is arranged on a light path between an external light source and the convex lens; the optical power meter is used for detecting the power of an optical signal, converting the power into a first electric signal and inputting the first electric signal to the controller. The characteristic that the refractive index of the electro-optical crystal directionally changes along with an electric field is utilized, the three-dimensional angle error generated when laser is incident and coupled to the center of the optical fiber end face is adjusted and compensated in real time by modulating voltage, and it is ensured that signal laser emitted by an external light source is incident to the center of the optical fiber end face accurately and vertically in real time; therefore, the efficiency, quality and stability of free space laser communication are improved; the device is simple in structure, small in size and wide in application range.

The invention discloses a three-dimensional space perception and reconstruction system, method and device, a medium and a product, and relates to the field of computer vision, three-dimensional reconstruction and SLAM, and the system comprises a hemispherical compound eye camera array module which comprises a pedestal and a plurality of cameras; the plurality of cameras are arranged on the base in a non-coplanar manner, and the spatial distribution of the plurality of cameras forms a hemispherical curved surface; the optical axis of each camera points to different directions, and the combined view field covers a solid angle greater than 180 degrees; the synchronization and control module is electrically connected with the hemispherical compound eye camera array module and is used for sending hard synchronization signals to all cameras; the computer processing module is connected with the synchronization and control module and used for receiving and processing the image data of all the cameras and executing a three-dimensional space perception and reconstruction method, and the three-dimensional map reconstruction efficiency is improved.

The invention discloses an optical fiber type interference exposure system and an interference exposure adjustment method, and relates to the technical field of holographic gratings, and the system comprises a light guide assembly which comprises a first optical fiber and a second optical fiber; the grating substrate is provided with a plurality of exposure positions, and the first coherent light and the second coherent light led out by the light guide assembly form an interference exposure field on the grating substrate; the compensation device is provided with a plurality of compensation areas, each compensation area is provided with a compensation deflection angle corresponding to one exposure position, and the compensation device is arranged on a propagation path of at least one beam of light in the first coherent light and the second coherent light. Therefore, the interference solid angles of the incident first coherent light and the second coherent light at the corresponding exposure positions are adjusted through the compensation area on the compensation device, so that the grating obtained by interference exposure has the same grating angle at different exposure positions of the grating substrate, and the consistency and uniformity of the grating angle are ensured; and a good imaging effect of the grating is achieved.

The invention discloses a panoramic image rendering quality evaluation method and related equipment, and relates to the technical field of simulation scenes, and the method comprises the steps: constructing a three-dimensional Gaussian scattering model based on panoramic image data of a target scene; selecting a target viewpoint in the three-dimensional Gaussian scattering model, and generating a rendered image based on the target viewpoint; determining a rendering quality index at the target viewpoint based on a solid angle approximation method; determining a feature matching distance index of the rendered image and a target scene image according to a preset diffusion model evaluation condition; and obtaining a rendering quality evaluation result of the panoramic image data according to the rendering quality index and the feature matching distance index. The invention provides a method for quantitatively evaluating the rendering quality of a panoramic image during reconstruction based on a three-dimensional Gaussian scattering model. The semantic consistency and scene authenticity of a generated image and a real image are checked by utilizing a diffusion model evaluation condition.

A multi-beam microscanner system for projecting, in particular for imaging, electromagnetic radiation onto an observation field, in particular into a solid angle emanating from the microscanner system, comprises a substrate stack with a plurality of substrate layers stacked one on top of the other along a stacking direction. A radiation source, in particular a laser radiation source with one or more lasers, for generating the electromagnetic radiation, in particular one or more laser beams, is arranged in or on a first substrate layer of the substrate stack.A second substrate layer of the substrate stack comprises a micro-electro-mechanical system (MEMS) with at least one deflection element arranged in a beam path of the electromagnetic radiation and suspended so as to be capable of rotational vibration about at least one oscillation axis for deflecting at least one electromagnetic beam emitted by the radiation source in a directionally variable manner. The microscanner system is produced by singulation from a layer arrangement, so that the manufacturing steps prior to singulation for a plurality of microscanner systems can be performed at the level of the layer arrangement. An image projection device contains a plurality of the multi-beam microscanner systems.

The invention provides a muon detector scintillator self-checking method, and relates to the field of muon detectors, and the method comprises the steps: constructing a muon scintillator self-checking model, and determining the number of actually measured muons through the muon scintillator self-checking model; introducing a solid angle correction factor, and correcting the actually measured muon number to obtain a geometrically corrected muon number; and calculating an average value and a variance of the muon number after geometric correction, and obtaining a scintillator self-inspection result of the muon detector in combination with an anomaly evaluation function. The technical scheme of the invention is suitable for health monitoring in the field long-term detection operation process of the scintillator, and can find the abnormality of the scintillator in time, thereby avoiding the waste of detection time, and improving the reliability of data.

The invention relates to a high-reflection optical element transmittance and forward and backward scattering absolute measurement method based on an annular cavity optical cavity ring-down technology. A multi-channel cavity ring-down technology is utilized to synchronously measure cavity ring-down signals transmitted by the cavity mirror with known transmittance in the annular cavity, transmitted by the high-reflection optical element to be measured, and forwards scattered and backwards scattered by the high-reflection optical element to be measured within a certain solid angle. And when the ring-down time of the four paths of optical cavity ring-down signals is consistent, calculating the transmittance of the to-be-measured high-reflection optical element and the scattering values of the to-be-measured high-reflection optical element in a certain solid angle in the forward direction and the backward direction in the annular cavity through the ratio of the amplitude of the optical cavity ring-down signals of the three paths of to-be-measured high-reflection optical element to the amplitude of the transmission signal of the cavity mirror and the transmittance of the cavity mirror. According to an optical element surface scattering distribution vector theoretical model, forward scattering and backward scattering values in any collection angle range in the light beam center direction can be calculated through forward and backward scattering experiment measurement curves in different solid angles.

The invention relates to a projection unit (110) for projecting a test pattern (140). Using the test pattern (140), the sharpness properties of an optical test object (X) can be tested. The projection unit (110) comprises a diffractive optical element shaped to generate a plurality of virtual test objects (142, 143) as the test pattern (140) in response to different excitation light (125, 135) coupled into the projection unit (110) simultaneously from one or more light sources (120, 130). Different of the test objects (142, 143) are arranged in different focal planes and at different solid angles from the perspective of the test object (X).

This application relates to the fields of underwater acoustic engineering, marine engineering, and sonar technology, and particularly to a passive localization method and system for deep-sea horizontal array sound sources based on high-precision azimuth estimation. The method samples the sound source signal using a horizontal array and estimates the earliest arrival time. After Fourier transform and phase compensation, a fringe slope cost function is constructed and a reference value is obtained through blind search. This reference value is then combined with frequency-shifted data beamforming to obtain a high-precision azimuth angle, while conventional beamforming obtains the solid angle, decoupling to obtain the elevation angle. The theoretical time delay for different assumed depths is then calculated, and the measured time delay spectrum is obtained from the broadband beam output. After matching the two, the actual depth of the sound source is determined by the minimum value of the cost function. This application reduces the computational load, decouples the azimuth and elevation angles of the horizontal array, solves the problems of horizontal arrays lacking elevation angle estimation capabilities and depth ambiguity in traditional methods, and improves the efficiency and accuracy of passive localization of deep-sea sound sources.

The present application relates to a kind of infrared scene quantitative radiance calculation methods based on light ray tracking module, comprising: obtaining target mask information image, the radiance image of infrared scene, depth information image and position information image, sensor position information, sensor field of view and sensor observation direction;Infrared scene is divided into several view cones according to the resolution of target radiance area image, wherein several view cones and the object surface in infrared scene intersect to form several face elements;The radiance of each face element at the sensor is calculated by the theorem of solid angle projection;The radiance of several face elements at the sensor is accumulated, and the radiance of infrared scene to the sensor is obtained.The method supports full scene, single target, multiple targets as radiation energy source, and can be applied to high complex infrared scene simulation work;Without additional data support, the radiance at the sensor can be calculated without performing redundant work.

A particle analysis device includes: an acquiring unit to acquire a multi-viewpoint image obtained by synthesizing captured images of a lens array on which an image of light from a particle irradiated with light are formed via a main lens, the captured images being captured simultaneously from mutually different viewpoints by a plurality of cameras; a sensing unit to sense a light intensity pattern of scattered light scattered from the particle on the basis of the multi-viewpoint image acquired; an analyzing unit to analyze a scattering solid angle of scattered light relative to an optical axis of the main lens as a center on the basis of the light intensity pattern of the scattered light sensed; and a calculating unit to calculate a molecular weight and particle size of the particle on the basis of the scattering solid angle of the scattered light analyzed.

The invention relates to an AR diffraction optical waveguide rainbow pattern testing device which comprises a Z-axis hollow rotating table, an A-axis rotating displacement table, a hollow waveguide carrying table, an imaging type brightness and chrominance meter and a light generation module. According to the invention, by simulating the use scene of the diffractive optical waveguide in the hemispherical space, the multi-dimensional information such as the brightness, the azimuth angle, the solid angle and the position of the rainbow pattern is acquired and analyzed, the calibration capability is provided, the multi-dimensional and high-precision detection and analysis of the rainbow pattern are realized, and the effect of improving the repeated measurement precision is achieved.

The invention relates to a projection system having - a projector (22, 22'); and - a retroreflector (23), wherein the projector (22, 22') illuminates the retroreflector (23) and the retroreflector (23) reflects in a certain solid angle range.

This disclosure is directed to pulsed spectropolarimeters for conducting remote, non-perturbative measurements of the local magnetic field, density and temperature fields of a magnetized plasma medium. In one aspect, a pulsed spectropolarimeter includes a light source emitting a polarized light pulse having sufficiently narrow spatial extent at a prescribed wavelength and a light gathering optical system including a light gathering optic having an optic axis directed toward the medium and positioned to collect and collimate a predetermined solid angle of the scattered emission by the pulse in the backward direction, toward the source, while preserving the polarization state of the emission. A proportion of the emission is redirected to a spectrometer detector to determine the spectral distribution of the emission. A second optical collection and spectrometer system collects emission other than backscatter localized to the intersection of the pulse trajectory and the focus of this collection system.

The present invention relates to a large-field centripetal irradiation high-energy concentrator based on a high-damage threshold laser material and a design method thereof, which can be used in a cone target ICF experiment to solve the problem of limited incident angle of irradiated laser light due to the cone target structure. The device has a side surface and two front and rear spherical refractive surfaces, and the two spherical refractive surfaces are coaxial. The concentrator is made of a crystal with a high damage threshold. In the cone target ICF experiment, a light beam that is originally outside the solid angle of the cone target space and cannot be incident on the target capsule due to the limitation of the maximum incident angle can meet the requirements of the cone target for the incident angle after passing through the large-field centripetal irradiation high-energy concentrator, and still be incident on the target capsule in a centripetal irradiation manner. While ensuring the centripetal and irradiation uniformity of the light beam, the problem of limited incident angle of the irradiated light beam in the cone target ICF experiment is solved.

The invention discloses an underwater vehicle echo bright spot multi-dimensional feature joint statistical method based on test and simulation data fusion, and the method comprises the steps: constructing a bright spot feature fusion data set with authenticity and data scale through fusing the test actual measurement echo data of an underwater vehicle and model simulation echo data; by combining Hilbert transform envelope processing, peak-to-peak value energy extraction and the like, accurate extraction of multi-dimensional features such as target echo bright spot quantity, intensity, relative delay inequality, echo flicker features, target scale and the like is realized; bright spot intensity features are described by establishing an EH distribution model, bright spot delay inequality features are analyzed by adopting a Parzen window estimation method, and a dynamic statistical framework in a space solid angle range is introduced to reveal a spatial orientation statistical distribution rule of multi-dimensional features. The method breaks through the problems of limited data source, single feature dimension, insufficient azimuth statistical range and insufficient statistical model adaptability of a traditional target characteristic analysis method, and is used for target identification and echo simulation.

The invention belongs to the field of earthquake and stress distribution calculation, and particularly relates to an earthquake deformation and stress distribution calculation method and system based on a Green function. The method comprises the following steps: acquiring a triangular mesh and a to-be-measured point of a fault; constructing an earth fixed coordinate system, a triangular dislocation coordinate system and an angular dislocation coordinate system based on the triangular mesh of the fault; determining a transformation matrix to obtain a coordinate system; calculating interior angles of three vertexes of the triangular mesh in the coordinate system and corresponding supplementary angles, selecting equivalent configuration based on the supplementary angles, calculating barycentric coordinates of orthogonal projection of the to-be-measured point on the triangular dislocation plane, and selecting configuration based on a partition inequality of the barycentric coordinates; according to configuration, a Burgers function is obtained through calculation by using a solid angle formula, incomplete displacement contributions of all angular dislocations are superposed, and a complete displacement field containing slip continuity correction is obtained; a stress field is calculated based on a complete displacement field or through a Green function of strain. And the seismic deformation and stress distribution calculation performance is obviously improved.

The invention provides a broadband bidirectional reflectance distribution function (BRDF) measurement method and system of source-to-direction hemispherical reflectance (DHR), belongs to the technical field of bidirectional reflectance distribution function measurement, and is used for reflection spectrum distribution measurement of materials at different wavebands and detection angles. Existing researches on the aspects of BRDF measurement, modeling, application and the like mainly aim at visible light and near-infrared bands, spectrum BRDF measurement is directly achieved through a broadband light source, the method has the advantages of being rapid, simple and convenient, however, when an incident signal is decomposed to a wavelength point, energy is weak, and the measurement signal-to-noise ratio is affected. According to the invention, the BRDF measurement absolute value is traced to the direction hemisphere reflectivity by using the relation between the BRDF and the reflectivity and adopting a BRDF relative measurement method, so that the measurement of incident light and a detection solid angle is avoided. In the aspect of detection, a band-pass spectrum is selected by using an optical filter, and broadband BRDF measurement is carried out. According to the method and the system, complete measurement of the BRDF is realized, and the method and the system have important significance in the fields of infrared remote sensing and radiation temperature measurement.

The application relates to a low-altitude signal coverage prediction method and system based on spherical non-uniform sampling, wherein the method comprises the following steps: determining the region complexity of different regions according to a digital surface model graph, constructing a direction sampling weight function according to the region complexity and an antenna directional diagram gain; performing spherical non-uniform sampling on a unit sphere based on the direction sampling weight function to generate a ray direction set matched with the sampling weight; calculating the spherical solid angle corresponding to each sampling direction based on the ray direction set, calculating the transmission power corresponding to each ray according to the spherical solid angle and a base station antenna directional diagram; taking the ray direction set and the transmission power as inputs to perform ray tracking propagation calculation to obtain the received signal power of each sampling point at low altitude, and the low-altitude signal coverage prediction is completed. The problems of how to improve the efficiency and accuracy of low-altitude signal coverage prediction in the related art are solved.

Flowcells and Raman analysis systems provide improved signal collection dynamics through increased solid-angle geometries and improved numerical aperture for near-diffraction-limited performance. A combined excitation / collection beam passes through a first optical material, a sample conduit and a second optical material. A concave reflective aspheric surface focuses and re-collimates the combined beam to and from a region of the sample within the conduit. The optical materials may comprise separate windows or may integrally form sidewalls the conduit. The reflective surface may be spaced apart from the second window or may be integrally formed with the second optical material. The focused region in the sample may approximate a point or a line, and at least a portion of the interior wall of the conduit may be reflective, causing the combined beam to pass through the sample region more than once to enhance collection efficiency.

According to an embodiment, an optical inspection apparatus includes an illumination portion, an imaging portion, and a processor. The illumination portion is configured to irradiate a first object point of an object with a light beam flux at one or more solid angles. The imaging portion is configured to acquire an image of the object according to illumination with the light beam flux. The processor causes the first object point to be irradiated with a light beam flux at a first solid angle by first illumination light, acquires a first captured image of the object with the first illumination light, causes the first object point to be irradiated with light beam fluxes at the third and fourth solid angles by second illumination light, acquires a second captured image of the object with the second illumination light, and acquires information regarding the object by the first and second captured images.

The application discloses a phased array weather radar calibration method based on generalized metal ball calibration theory. The method comprises the following steps: collecting two-dimensional antenna pattern data of a phased array weather radar under at least one working mode and multiple different beam directions in a microwave darkroom; performing numerical integration on the two-dimensional antenna pattern data, calculating a combined beam main lobe real solid angle of a transmitting antenna and a receiving antenna, and calculating an equivalent beam width product; calculating a calibration theory reflectivity factor of a metal ball based on a radar scattering cross section of the metal ball and the equivalent beam width product; acquiring actual detection echo data of the phased array radar on the metal ball under different working modes and beam directions, and calculating an actual reflectivity factor; and comparing the actual reflectivity factor with the calibration theory reflectivity factor, thereby completing calibration of the phased array weather radar. The application can quantitatively evaluate the reflectivity factor of the phased array weather radar in a non-Gaussian working mode, and improves radar detection performance.

A radiation source identification system using Compton image projection in a three-dimensional virtual space, according to the present invention, comprises: a gamma image generation module that includes a gamma camera and generates 4-pi full-solid-angle Compton image data; an indoor positioning module that includes a plurality of fixed beacons and one mobile beacon and generates coordinates of the mobile beacon; a rotating support module that includes a fixed plate on which the mobile beacon of the indoor positioning module and the gamma image generation module are mounted, and a driving control device that rotates the fixed plate according to an input directional angle; and an integrated data management module that stores and manages a three-dimensional building information model that depicts each facility of a nuclear facility as a three-dimensional object in a three-dimensional virtual space, converts the coordinates of the indoor positioning module and the directional angle of the rotating support module into reference coordinates and a reference direction in the three-dimensional virtual space, respectively, receives the Compton image data of the gamma image generation module, aligns same to the reference coordinates and the reference direction to project same, and identifies a radiation source.

In a surface shape analysis system that analyzes the surface shape of a workpiece in a single image using the illuminance difference stereo method, the solid angle of illumination of each analysis light at each point on the surface of the workpiece is made equal, and the size is made more compact. [Solution] A surface shape analysis system comprising: a light irradiator comprising a plurality of light sources that emit analytical light having different wavelength components or polarization directions; an optical system that guides each analytical light emitted from the plurality of light sources to the irradiated surface of a workpiece; an imaging device that separates and acquires each analytical light reflected from the irradiated surface; and an analysis unit that analyzes the image obtained for each analytical light by the imaging device to analyze the shape of the irradiated surface, wherein the optical system is configured to have different declination angles for each analytical light emitted from the plurality of light sources, and for each of the plurality of light sources, the solid angle of illumination at each point on the irradiated surface is equal.

The utility model relates to the field of wall corner surveying and mapping tools, and discloses a wall corner surveying and mapping fixing frame convenient to adjust, which comprises a support frame, a three-dimensional surveying and mapping rod is hinged to the top end of the outer surface of the front end of the support frame, a threaded rod A is rotatably connected to the top end of the inner surface of the support frame, and a hinge piece A is in threaded connection with the outer surface of the threaded rod A; the top end of the inner surface of the hinge piece A is hinged to the bottom end of the inner surface of a three-dimensional surveying and mapping rod through a hinge rod B. A plane surveying and mapping rod is hinged to the front end of the inner surface of the supporting frame, and a threaded rod B is rotationally connected to the bottom end of the inner surface of the supporting frame. According to the wall corner surveying and mapping device, the three-dimensional surveying and mapping rod is arranged, after the plane angle of a wall corner is measured, the threaded rod A is operated to independently drive the three-dimensional surveying and mapping rod to be unfolded upwards so as to carry out surveying and mapping on the three-dimensional angle of the wall corner, and the effects of time loss and surveying and mapping errors generated by redeploying a surveying and mapping device are avoided.

Method for generating input data for a convolutional neural network using at least one camera (3) and at least one area sensor (5, 6), wherein the camera (3) and the area sensor (5, 6) are arranged on the motor vehicle (1) such that the field of view of the camera (3) and the field of view of the area sensor (5, 6) overlap at least partially, wherein the method comprises the following steps: - Capturing an image frame by a camera (3), wherein the image frame consists of image data for directions relative to the position of the camera (3) and within the solid angle covered by the camera (3), wherein the directions are represented by coordinates in a camera coordinate system; - simultaneous acquisition of depth information by the range sensor (5, 6), wherein the depth information consists of depth data for directions relative to the position of the range sensor (5, 6) and within the solid angle covered by the range sensor (5, 6), wherein the directions are represented by coordinates in a range sensor coordinate system; - Providing a vehicle coordinate system that is related to the camera coordinate system and the area sensor coordinate system by appropriate sets of translations and rotations given by the position of the camera (3) and the position of the area sensor (5, 6) relative to the origin of the vehicle coordinate system; and - Transforming the coordinates in the camera coordinate system and the coordinates in the area sensor coordinate system into coordinates in the vehicle coordinate system based on the sets of translations and rotations, thereby obtaining the input data for the convolutional neural network.

The invention belongs to the technical field of non-sequence ray tracing, and particularly relates to a BSDF modeling method based on measured data. The method comprises the following steps: S1, setting the angle range of a solid angle under a spherical coordinate system corresponding to the movement range of a photoelectric detector as # imgabs0 #, dividing the solid angle into # imgabs1 # sub-regions according to equal angle intervals, and constructing a BSDF matrix by BSDF measurement values of the sub-regions according to the positions of the sub-regions; s2, carrying out expansion and boundary truncation on the BSDF matrix to obtain a weighted BSDF matrix; and S3, calculating central value coordinates of sub-regions corresponding to each element of the weighted BSDF matrix, and converting the central value coordinates of each sub-region from an angle space to a cosine space to complete two-dimensional modeling of the BSDF. According to the method, the influence range of the BSDF at the boundary position is reduced, so that the model deviation is reduced, and a good modeling result is obtained.

A method, system, apparatus, and computer-readable program product for determining the count rate linearity of one or more gamma detectors using a single gamma radiation source by varying the solid angle between the single gamma radiation source and one or more detectors (and therefore the emissivity observed by the detectors).