178 results about "Measurement plane" patented technology

The invention discloses a digital equivalent point source sound field reconstruction method based on a weighted truncation threshold, and the method comprises the steps: S1, arranging a measurement plane at one side of a target sound source, distributing M measurement points, and collecting sound pressure; s2, introducing a reinforcement learning mechanism into a target sound source surface to determine equivalent point source distribution, and generating N global equivalent point sources by adopting a low-density grid to construct a sound field model; s3, obtaining source intensity statistical characteristics based on the optimized self-attention mechanism, adjusting a sparse solution in the sound field model based on the source intensity statistical characteristics to obtain optimal source intensity statistical characteristics, improving the sound field model according to the optimal source intensity statistical characteristics, and performing optimal coarse grid global modeling according to the improved sound field model; and S4, obtaining optimal local encryption region details by adopting a multi-scale equivalent point source layout, and realizing high-precision reconstruction of a complex sound field by combining optimal coarse grid global modeling and local encryption region detail capture.

An inspection method for inspecting the dimensions or geometric features of a mechanical component (4) using an optoelectronic system of the shadow projection type, said method comprising calculating spatial coordinates of points (pi) of the surface of said component, allowing a suitable 3D reconstruction of the surface of said component, and inspecting the dimensions or geometric features using such spatial coordinates. The spatial coordinates of the points are calculated starting from a two-dimensional image (5i) and an associated contour, which are obtained by the shadow projection system when the mechanical part is rotated about the axis of rotation (A). The position of a point or edge (Ejk) of the contour and a change in such position are detected at a specific height (zj) as the angle of rotation ([theta] i) changes. Based on such a change, the position of the component to be inspected, which generates the points of the contour, relative to the measurement plane is identified and the spatial coordinates of the points of the surface are calculated.

The invention discloses an MAP scoring method and device based on kidney three-dimensional modeling, and belongs to the field of medical image processing. The method comprises the following steps: acquiring kidney medical image data, wherein the kidney medical image data comprises kidney CT image data; preprocessing the kidney medical image data; generating a complete kidney three-dimensional model based on the kidney medical image data; calculating the centroid positions of all voxels in the renal vein three-dimensional model, and taking the Z coordinate of the centroid as a standard measurement plane; identifying an anatomical region needing to be measured on the standard measurement plane based on a deep learning segmentation model; extracting an outer contour of the kidney based on the kidney three-dimensional model, determining a posterior abdominal wall contour based on the front edge of the lumbar major muscle, and calculating the shortest distance between the outer contour of the kidney and the posterior abdominal wall contour; and determining a perirenal fat region, enhancing the strip-shaped structure by using a multi-scale filter, and calculating the proportion of the strip-shaped structure in the perirenal fat region. According to the invention, objective quantitative evaluation of perirenal fat adhesion risk is realized.

The invention discloses a locking state detection method, device and equipment based on a laser contourgraph and a storage medium, and relates to the technical field of visual inspection, and the locking state detection method based on the laser contourgraph comprises the steps: scanning a locking product through the laser contourgraph, and obtaining target three-dimensional point cloud data; clustering and screening the target three-dimensional point cloud data to obtain a reference plane initial point cloud and a screw locking initial point cloud; performing plane fitting on the reference plane initial point cloud to obtain a reference plane; clustering, screening and fitting the screw locking initial point cloud to obtain a measurement plane set; and determining the locking state of the locking product through the measurement plane set and the reference plane. According to the invention, the state after locking can be detected through laser scanning, and the accuracy of locking state detection is improved.

The invention discloses a magnetic field inversion current method based on near-field scanning, and the method comprises the steps: obtaining magnetic field data in a circuit, and taking the magnetic field data as input; expanding the measurement plane of the magnetic field to obtain a magnetic field matrix, and enabling the current of the original magnetic field matrix H on the boundary to be continuous; constructing a relationship between the magnetic field and the current in the frequency domain space; a Tikhonov regularization method is used to reconstruct current distribution, and a GCV method is used to optimally select regularization parameters required by the Tikhonov regularization method; extracting structure information of the static current model, taking the structure information as a mask, and acting the structure information on a radio frequency current model result; and outputting the current in the original measurement window as the current reconstructed by the final method. Current artifacts on a boundary are eliminated by expanding a measurement plane, current distribution is automatically solved through regularization, errors caused by empirical selection of filtering parameters are avoided, the precision of reconstructed current is improved, and finally, spatial noise is suppressed through a mask method, and accurate reconstruction of radio-frequency current is achieved.

A method and apparatus for an angle meter cooperatively using two or more non-contact distance meters for measuring distances to a surface along substantially parallel lines. The measured distances are used for estimating or calculating the angle to the surface and the distance to the surface. The distance meters may use optical means, where a visible or non-visible light or laser beam is emitted and received, acoustical means, where an audible or ultrasound sound is emitted and received, or an electro-magnetic scheme, where radar beam is transmitted and received. The distances may be estimated using a Time-of-Flight (TOF), homodyne or heterodyne phase detection schemes. The distance meters may share the same correlator, signal conditioning circuits, or the same sensor. Two or more angle meters may be used defining parallel or perpendicular measurement planes, for measuring angles between surfaces, and for estimating physical dimensions such as length, area or volume.

The invention relates to the technical field of spaceflight optical remote sensors, and particularly discloses a calibration method and system for a secondary mirror gasket of a high-resolution space camera, and the method comprises the following steps: 1, carrying out the calibration of a secondary mirror gasket to be repaired in a state that the secondary mirror gasket to be repaired is assembled in the high-resolution space camera; obtaining a first reference point test result of a measurement plane of a secondary mirror installation and adjustment auxiliary tool connected with the secondary mirror structure; 2, when the high-resolution space camera is in the optimal wave aberration state, obtaining a second reference point test result of the measurement plane of the secondary mirror installation and adjustment auxiliary tool connected with the secondary mirror structure; 3, comparing the first reference point test result with the second reference point test result, and calculating to obtain the required grinding thickness of the secondary mirror gasket; and fourthly, the secondary mirror gasket to be repaired is corrected based on the obtained grinding thickness of the secondary mirror gasket. The method is high in calibration efficiency, high in calibration precision and wide in application scene.

A method may include illuminating an overlay target of a sample with one or more broadband illumination beams from one or more broadband illumination sources. The overlay target may include one or more meta-lens feature sets. Each meta-lens feature set may include one or more first features having a coarse pitch and one or more second features having a fine pitch. The one or more first features and the one or more second features of each meta-lens feature set may operate as a meta-lens array to generate a periodic distribution of light at a measurement plane. The method may further include generating one or more images of the periodic distribution of light at the measurement plane. The method may further include generating an overlay measurement of the sample based on the one or more images of the periodic distribution of light at the measurement plane.

The invention provides a line laser on-machine measurement path planning method. The method comprises the following steps: taking a point corresponding to a minimum value of an average geodesic distance on a to-be-measured curved surface as an initial pose measurement point; defining a line laser optimal pose measurement coordinate system, and calculating all intersection points on an intersection line of the line laser measurement plane and the curved surface to be measured to obtain a series of line laser simulation measurement result points and normal vectors thereof; the adjustment angle from the current iteration direction vector to the next iteration direction vector of the line laser serves as an optimization variable to construct a line laser local optimal measurement pose target function, the optimal adjustment angle is solved, and the line laser local optimal measurement pose is obtained; iteratively solving to obtain a fairing line laser measurement path 1, and calculating and optimizing the visibility of the fairing line laser measurement path 1 to obtain a line laser measurement path 2; fitting and interpolation are carried out on the line laser measurement path 3 to obtain a uniformly encrypted line laser measurement path 3. According to the invention, the problem of insufficient precision of complex curved surface measurement path planning in the line laser on-machine measurement process is solved.

1. The name of the product of this design: Laser Level (Small Five-Line‑D011CG). 2. Purpose of the product of this design: A laser-assisted measuring tool used to measure whether a surface is uneven. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

A light-emitting device includes a substrate, a wiring, a light-emitting element configured to emit light having a main wavelength in a range from 500 nm to 560 nm, and a diffusion member. When chromaticity x and chromaticity y of an emission color of the light-emitting device are measured in each of first and second measurement planes in a range in which an angle at the center of the outer shape is in a range from ±60° with reference to a perpendicular line passing through the center of the diffusion member, an average value α of a difference between a maximum value and a minimum value of a chromaticity difference Δx of the chromaticity x measured in the first measurement plane and a difference between a maximum value and a minimum value of a chromaticity difference Δx of the chromaticity x measured in the second measurement plane is less than 0.0024.

Measuring device for measuring at least one property of an optical element, wherein the device comprises: - a frame; - a supporting device arranged for supporting the optical element on the frame; - a rotating body arranged to rotate relative to the frame around a rotation axis; - a measurement system arranged to measure the relative position of the rotating body and the frame in at least one measurement plane; - a probe arranged on the rotating body for measuring the at least one property of the optical element, wherein the probe is located at a position out of the at least one measurement plane.

The present invention relates to the field of automatic measurement of the hole positions of industrial annular parts, and provides a convenient automatic circumferential hole finding and automatic hole center alignment detection method and device, which are used for the automated assembly of a certain large precision part in aerospace. During measurement, the annular part is first automatically aligned, and the XYZ axis of the four-coordinate truss robot is moved to align the rotation center of the measuring end with the center of the annular part. The sensor is then moved to the radial position of the hole position to be measured by the radial cylinder. The Z axis is slowly moved downward to the measuring plane. When the value of the optical fiber sensor is higher than the threshold value 1, the predetermined detection height is reached, and the movement of the Z axis is stopped. The rotating R axis drives the digital optical fiber sensor to rotate one circle. Through the change in the value of the optical fiber sensor, the circumferential scanning hole finding and hole center positioning of the small blind hole of the annular part are realized with the value below the threshold value 2 as the standard. The present invention adopts a non-contact measurement method to avoid scratches and bumps on precision parts to the greatest extent.

The invention belongs to the technical field of degaussing, and relates to a ship winding degaussing current solving method based on a gradient tensor, which comprises the following steps: acquiring the magnetic gradient tensor of a plane ship when coils are not electrified; respectively performing simulation electrification on the winding coils to obtain the magnetic gradient tensor of the electrified measurement plane; and calculating an efficiency matrix of the magnetic gradient tensor excited by the unit current. The gradient of the geomagnetic field is extremely small, direct detection of the magnetic gradient tensor of the ship and the electrified coil can better reflect the magnetic characteristics of the ship and the coil compared with detection of a magnetic vector, and better resolution is achieved for magnetic field changes caused by magnetic anomalies; under the motion platform, the magnetic gradient tensor is insensitive to the attitude angle error, and more accurate detection data can be obtained; in addition, the gradient tensor is weak in response to time-varying geomagnetic disturbance, and has higher anti-interference capability. Therefore, according to the method, the accuracy of ship magnetic field modeling and degaussing current calculation is improved, and the magnetic stealth performance of a ship facing high-sensitivity magnetic gradient detection equipment is enhanced.

The invention discloses a plane inclination angle measuring method based on laser ranging. According to the method, firstly, three laser ranging modules are placed on a measuring plane, and the relative positions of the three laser ranging modules are fixed; then, establishing a three-dimensional Cartesian coordinate system by using the modules, and measuring an included angle between the three-dimensional Cartesian coordinate system and a coordinate axis; then, calculating the coordinates of the module in the coordinate system, and calculating the included angle between the coordinates and the included angle to obtain a unit normal vector of the measurement plane; thirdly, the three modules are controlled to emit laser to measure the distance of the photovoltaic panel, and the coordinates of the measuring points on the photovoltaic panel are calculated according to the distance measuring result; and finally, constructing a plane equation of a plane where the photovoltaic panel is located by using the coordinates, and calculating an included angle between the plane where the photovoltaic panel is located and the xy plane. The problem that in the prior art, a user needs to climb a photovoltaic support to measure the inclination angle of a photovoltaic panel, and measurement is difficult is solved.

The present invention provides a method and system for testing the motion flatness based on line laser and position detector calibration, which relates to the field of high-precision geometric testing. The motion flatness testing method calibrates the position-sensitive detector based on a reference motion platform before measurement to ensure the measurement accuracy, and can accurately measure the scanning space motion flatness of the target test motion platform. The entire testing system is added to the motion control system of the spatial motion platform as an error measurement component for high-precision spatial motion scanning testing, which can measure the flatness error value in real time and feedback it to the motion control system of the spatial motion platform. During the scanning test process, the Z-axis offset value measured on the position-sensitive detector is monitored and read in real time, and the Z-axis component is driven for fine adjustment and calibration, so that the end of the position-sensitive detector always maintains planar motion in the scanning space, realizing high-precision scanning space planar motion.

Provided is a 3D model reconstruction method for a weld, by converting multiple sets of two-dimensional scanning results into three-dimensional point cloud data of the weld in a welding gun coordinate system, and then extracting a spatial plane model according to the scanning weld data characteristics, and reconstructing a spatial data set matching the welding plane, the measurement error caused by the inconsistency between the measurement plane and the welding plane is solved, so as to obtain accurate weld appearance characteristics, solve the problem that the traditional method cannot truly reflect the specific change characteristics of the weld, improve the weld model precision and quality, accurately position the appearance characteristics and position of the weld, and thus improve the welding quality and precision.

A system (1) for determining the radiation characteristics of an antenna includes an azimuthal positioner (50) comprising a device for rotating an antenna (2) about a vertical axis of rotation (R), a measuring arm (10) having a free end (12) and a mounting end (11), a frame (20) on which the measuring arm is mounted and comprising means for driving the mounting end of the measuring arm in a tangential plane (P1) to a cylinder of revolution with axis, the vertical axis of rotation (R), and measuring probes (40) positioned on the free end of the arm, the measuring arm extending longitudinally towards the azimuthal positioner in a horizontal direction perpendicular to the tangential plane,the drive means of the mounting end of the measuring arm driving the entire set of measuring probes in a measuring plane (P2) parallel to the tangential plane and extending at a distance from the vertical axis of rotation. Figure for the abbreviation: [Fig.1] ,

The invention discloses a medical intelligent waistline measuring system and method, and the method comprises the steps: 1, carrying out the disinfection treatment of a device, 2, enabling a user to keep a standing posture, enabling the two feet to be separated by 25-30 cm, enabling the upper limbs to fall naturally, keeping the body balance, enabling the device to surround the waist, and enabling the device to be used for measuring the waistline. 3, starting a positioning module, and automatically identifying and locking the midpoint of the connecting line of the axillary centerline crista iliaca and the costal arch as a measurement point by using a bilateral infrared bony marker scanning device, and 4, after positioning and horizontal calibration are completed, slightly tightening the sensing belt, keeping the pressure constant at a standard value so as to ensure the measurement accuracy, and then completing the measurement by the equipment. By adopting the bilateral infrared osseous marker scanning device and the three-axis MEMS gradienter, accurate positioning of a waistline measuring point and automatic calibration of a measuring plane are achieved, the accuracy and reliability of measurement are improved, and meanwhile errors caused by human factors of a traditional measuring tool are avoided.

The invention discloses a molecular marker tracing sequence multi-stripe single-frame high-speed flow field velocity measurement method, and belongs to the field of wind tunnel flow field detection. The problem of engineering requirements of high-speed flow measurement is solved. A femtosecond laser system is built in a measurement flow field; time sequence control is set for the femtosecond laser system; carrying out system calibration; image background removal processing is carried out, and then a fluorescence image converted to a standard measurement plane is obtained based on the transformation relation; carrying out fine extraction on a fluorescence signal feature region to obtain the fluorescence signal feature region; carrying out fluorescence position extraction, and extracting central point positions on a plurality of fluorescence lines; and calculating the horizontal direction speed and the vertical direction speed of the current flow field. The method provides accurate speed measurement data, is suitable for accurate measurement of a high-speed flow field, and provides powerful support for pneumatic testing and aircraft design.

The invention provides a simple flatness measuring device and method, the simple flatness measuring device comprises a positioning datum line, a positioning datum point and an indication type measuring tool, the positioning datum line and the positioning datum point are matched to determine a positioning datum plane, and the indication type measuring tool can move along the vertical direction of the positioning datum plane relative to the positioning datum plane and can be fixed. The surface of the to-be-measured object is measured through the positioning datum plane formed by the positioning datum line and the positioning datum point in cooperation with the calibrated indication type measuring tool, for example, the flatness of the surface of the to-be-measured object is measured, the method can be suitable for measurement of the vertical face, the inclined face and the outer surface of the object with the small working space, and the use flexibility is high.

The application discloses a kind of floating offshore solar radiation measurement data correction method and system, it includes the following steps: obtaining the pitch angle and roll angle of floating offshore solar radiation measurement system;Obtain the unit normal vector of the measuring plane pointing to the sky in the horizontal plane rectangular coordinate system;Calculate the angle between the measuring plane and the horizontal plane;Get horizontal plane solar zenith angle and azimuth angle;Construct the unit vector along the direction of sunlight incidence pointing to the sun;Correct the zenith angle;Calculate the horizontal plane scattered irradiance value;The horizontal plane total irradiance saved by floating offshore solar radiation measurement system is corrected, and the corrected horizontal plane total irradiance is obtained.The measurement data of the floating offshore solar radiation measurement system is corrected by the application, the measurement error caused by the inclination of the measurement platform caused by wind and wave is reduced, and more accurate measurement data is provided for the evaluation of offshore light resources and the planning of offshore photovoltaic power station.

An imaging-based non-contact gloss measurement device, includes: a housing having a top cover provided with a measurement window, a measurement zone being located above the measurement window; an illumination light source mounted inside the housing and on one side of the measurement window and configured to illuminate the measurement zone at an incident angle θ1; and a grayscale camera mounted inside the housing and on the other side of the measurement window and configured to receive light reflected from the measurement zone at a reflection angle θ2 for grayscale imaging, and obtaining gloss values from the grayscale values. The illumination light source has an incident divergence angleα1′in the measurement plane and an incident divergence angleβ1′perpendicular to the measurement plane; the grayscale camera has a reflection divergence angleα2′in the measurement plane and a reflection divergence angleβ2′perpendicular to the measurement plane, θ1=θ2,a1′>α2′⁢ and⁢ β1′>β2′.

An electronic measuring device includes a weighing plate, extending along a measuring plane and including an upper face configured to receive a user's feet; a lower face, opposite the upper face, and a rounded edge connecting the upper face to the lower face; and at least one electrode extending on the weighing plate from the upper face over the rounded edge to the lower face.

The utility model relates to the technical field of medical instruments, and discloses a haemorrhoids measurer, which comprises a handle, measuring arms and a connecting shaft, one end of the handle is connected with the connecting shaft, the periphery of the connecting shaft is connected with N groups of measuring arms in a circumferential array mode, the N groups of measuring arms are respectively vertical to the handle and are located on the same measuring plane, and the N groups of measuring arms are perpendicular to the handle. The N sub-regions are used for equally dividing the measuring plane into N sub-regions and observing the size of the occupied range of haemorrhoids in the sub-regions; wherein N is a positive integer, and N is greater than or equal to 2; a sliding groove is formed in the connecting shaft, one end of the measuring arm is arranged in the sliding groove, and the measuring arm rotates around the connecting shaft to adjust the angle of the haemorrhoids measuring arm. The size and the range occupied by haemorrhoids in the rectum can be measured through the measuring arm, and compared with traditional subjective visual diagnosis, the diagnosis accuracy is improved.

The application provides a kind of robot-based cooperative target six-dimensional pose full-automatic positioning method and system, comprising: establishing hand-eye coordinate relationship step: through the switching of tool coordinate system and vision sensor coordinate system, the hand-eye coordinate relationship of robot is established;Leveling step: the plane normal is measured and adjusted by cooperative target plane normal measurement device;Wherein, the measurement and adjustment process is a full-automatic process;Establishing initial workpiece coordinate system step: the initial workpiece coordinate system of cooperative target is established by using cooperative target plane normal measurement device;Adjustment step: adjust the posture and position of vision sensor photographing;Photographing step: photographing is carried out by using the vision sensor after the adjustment step, and the surface workpiece coordinate system of cooperative target is calculated;Positioning step: the surface workpiece coordinate system of cooperative target is established according to the photographing result, and the full-automatic positioning of cooperative target six-dimensional pose is completed.The application can be fully automatically operated, the result is accurate, the efficiency is high, and the operation is simple.

The present invention discloses a non-contact acoustic signal detection device and method for bearing faults. The method is as follows: a rotating bearing to be tested, wherein a defect thereof interacts with other components of the bearing to generate a time-series phase difference wave packet; the time-series phase difference wave packet is amplified by an acoustic superstructure provided on the bearing to form a vortex pulse acoustic soliton signal; the vortex pulse acoustic soliton signal is output; an acoustic detection mechanism detects the degree of acoustic field focusing of the vortex pulse acoustic soliton signal, determines a final measurement plane, and collects the transmitted acoustic pulse signal; amplifies the collected signal; decomposes and analyzes the detection signal; collects the acoustic vortex signal to obtain a corresponding data set, trains and learns the data set, uses vibration signals at different time scales as input, fuses multiple LSTM neural network models, extracts features and designs a classifier, designs a bearing fault information sequence in the time domain, and constructs a bearing digital twin model for virtualized analysis of fault detection.

The invention relates to a magnetic measuring assembly (10) for detecting a movement of a linearly movable component (1), comprising a magnet assembly (14), which is connected to the linearly movable component (1) and which can be moved along a movement axis (BA) in a first direction (BR), and at least one sensor (11), which comprises at least one measuring means assembly and which is spaced from the magnet assembly (14) perpendicularly to the first direction (BR) in a second direction (LR) by means of an air gap (LS). The magnet assembly (14) comprises at least two permanent magnets (14A, 14B). A first permanent magnet (14A) is magnetized in a first magnetization direction (MR1) at a first tilting angle (KW1) relative to the second direction (LR), and a second permanent magnet (14B) is magnetized in a second magnetization direction (MR2) at a second tilting angle (KW2) relative to the second direction (LR), wherein the first tilting angle (KW1) is tilted in the first direction (BR) or opposite the first direction (BR), and the second tilting angle (KW2) is tilted in the first direction (BR) or opposite the first direction (BR). The at least one sensor (11) is designed to detect at least one magnetic variable on a measuring plane defined by the first direction (BR) and the second direction (LR) and output at least one output signal (AS) which represents the distance traveled by the movable component (1).

The application provides a kind of terahertz wave power distribution measurement method based on circular sensor, belong to engineering and physical experiment measurement technical field, this method includes: obtaining the quantitative relationship of the output total power of circular sensor and the power density of measurement plane;Establish the resolution of the measured power distribution image of measurement plane, the constraint condition of measurement back-propagation error and the translation step of sensor;According to the translation step control of sensor, the translation measurement of circular sensor in measurement plane is carried out, to obtain the measurement power data set;According to the resolution, the measurement plane is discretized and the objective function is constructed, and the discrete power density of the measurement plane is obtained by solving the objective function;The measured power distribution image of measurement plane is reconstructed, and the measured power distribution image of measurement plane is output.The application has the advantages of high precision, adjustable resolution and controllable error, and is suitable for high-precision measurement scenarios of various engineering and physical experiments.

A method for checking dimensions and geometrical features of a mechanical part using an optoelectronic system of the shadow casting type includes calculating the spatial coordinates of points of the surface of the part that allow a 3D reconstruction of the surface of the part, and checking the dimensions and geometrical features making use of such spatial coordinates. The spatial coordinates of the points are calculated starting from two-dimensional images and relevant profiles obtained by means of the shadow casting system while the mechanical part rotates about a rotation axis. The position of points or edges of the profiles and variation of such position are detected at predetermined heights as the rotation angle varies. On the basis of such variation, the position, with respect to a measurement plane, of points on the part to be checked which generate points of the aforementioned profile is identified and the spatial coordinates of the points of the surface are calculated.