173 results about "Linear measurement" patented technology

A method and a device for identifying geometric errors of a numerical control (NC) machine tool based on a modified nine-line method. Motion errors between a plurality of rigid bodies of the NC machine tool is superimposed to construct a comprehensive error model based on multibody system kinematics theory and a topological structure of the NC machine tool. Optimization is performed based on the comprehensive error model and a preset fitness function to predict six optimal measurement positions. Six linear measurement trajectories are established respectively at the six optimal measurement positions. The six linear measurement trajectories are each parallel to one of an X-axis, a Y-axis, and a Z-axis. error terms for each of the six linear measurement trajectories are measured to establish a first equation set having six first equations. Geometric error simulation and identification for the NC machine tool are performed based on the first equation set.

The invention provides an out-of-focus lens microlens diopter measurement method, system, medium and device, and relates to the technical field of optical measurement, and the method comprises the steps: placing a to-be-measured out-of-focus lens on a rotary table; controlling a Z-axis motion guide rail to drive a line measurement sensor to move, and determining a path scanning zero point; the rotary table is controlled to rotate at a constant speed, and the X-axis movement guide rail and the Z-axis movement guide rail drive the line measurement sensor to move so as to obtain point cloud data of the upper surface of the to-be-measured out-of-focus lens; performing conversion, fitting and data extraction on the point cloud data to obtain a two-dimensional profile curve of each micro lens unit included in the to-be-measured defocus lens; and calculating the diopter of each micro-lens unit according to the two-dimensional profile curve of each micro-lens unit. According to the method, independent quantitative evaluation of the additional diopter of the microstructure is realized, and the defects that the macroscopic diopter and the microstructure diopter cannot be separated by a lensometer and the macroscopic diopter and the microstructure diopter are difficult to accurately disassemble in an existing non-contact technology are overcome.

A tape measure device including a housing with branding options, a lock tab mechanism for controlling tape extension / retraction, and compatibility with different tape lengths is disclosed. The tape measure blade incorporates three distinct sets of ascending and descending numbers, each tailored for specific measurement scenarios. The first set offers traditional ascending linear measurements, identical to a standard tape measure, simplifying common length assessments. The second set (i.e., descending set) is engineered for calculating differences (i.e., section cut-offs) in 8-foot building materials, while the third set (i.e., descending set) caters to 12-foot materials. The aforementioned sets enable users to quickly identify and cut precise lengths without the need for extensive tape measure blade extension. The device's design optimizes ease of use, portability, and secure storage through a belt clip.

The invention relates to the technical field of automobile manufacturing, discloses a measuring gauge for the ablation edge angle and the profile tolerance of a door ring single plate, and solves the problems that an existing measuring gauge for the ablation edge angle and the profile tolerance of the door ring single plate can only perform single-dimension linear measurement, time and labor are wasted due to multi-step operation, and efficiency is low. The device comprises a frame, a workbench arranged at the top end of the frame and a dial indicator movably connected to one side of the workbench, the dial indicator is stably fixed through driving of a three-clamp structure, a driving structure, a moving assembly and a fixed-point measurement structure, the measurement accuracy and reliability are improved, meanwhile, a camera can record data in real time, three-face clamping is conducted on a single plate, and the measurement accuracy and reliability are improved. The device is simple in structure and convenient to operate, ensures that the device is fixed in position in the measurement process, can perform multi-path and fixed-point equidistant measurement on the measurement surface of the single board, improves the measurement integrity and accuracy, facilitates the evaluation of the quality of the single board, can achieve comprehensive and efficient continuous measurement through the cooperation of a short rack and a second gear, and is suitable for large-scale production measurement.

The invention discloses a self-supervised tomographic SAR (Synthetic Aperture Radar) reconstruction method based on orthogonal subspace decomposition. According to the method, a traditional single original space is reconstructed and expanded into a Range-Null-Raw triple space collaborative learning framework, an R2R and N2N principle-based self-supervised loss function is constructed by using an orthogonal subspace decomposition characteristic of a linear measurement operator, direct mapping learning from noise measurement data to a high-quality reconstruction result is realized, and the real-time performance of a real-time reconstruction system is greatly improved, so that the real-time performance of the real-time performance of the real-time performance of the real-time performance of the real-time performance of the real-time performance of the real-time performance is improved. Observable components are learned through Range space, unobservable components are learned through Null space, a cross constraint strategy of global consistency is ensured through Raw space, and the adaptability of the model to real measurement conditions is enhanced. The performance gap between simulation training and actual deployment in deep learning TomoSAR reconstruction is effectively solved, and a new solution is provided for reliable application of an unsupervised deep reconstruction network in a real TomoSAR imaging task.

The utility model provides an insulation measuring rod which comprises an insulation rod, a measuring head and a measuring device, the measuring head is arranged on the head portion of the insulation rod, the measuring device is arranged inside the tail portion of the insulation rod, the head portion of the insulation rod is provided with a fixing ring, and the tail portion of the insulation rod is provided with a rotatable wire roller. A wire of the measuring device is wound on the wire roller and is connected with the measuring head through the fixing ring. The beneficial effects of the utility model lie in that the circular ring is arranged at the rod head as a fixed pulley, so that the measuring head can descend along with a lead at the rod head, and the whole device forms an L shape to measure more multi-angle measuring positions which are inconvenient for linear measurement, thereby solving the problem of measurement in a complex environment or an environment in which linear approach is difficult, and improving the measuring accuracy. The position and the angle of the measuring head can be flexibly adjusted, and the whole measuring device forms an L-shaped structure, so that the measuring device can adapt to more multi-angle measuring requirements, especially positions which are difficult to reach through a linear measuring method.

The invention discloses a dynamic temperature field real-time reconstruction method and system based on multi-source sound wave data, and relates to the technical field of fire monitoring and early warning, and the method comprises the steps: deploying a sound wave receiving and transmitting array in a target region, constructing a multi-source sound wave measurement network, and determining a signal track space; connecting a visual simulation platform, constructing a verification database and storing the verification database to a platform data center; developing a reconstruction unit in the visual simulation platform, and determining a reconstruction temperature field; and executing linear measurement and calculation based on acoustic trajectory points and interpolation compensation of a non-trajectory region by taking a preset distributed interval as a constraint. According to the invention, the technical problems that the measurement is easy to interfere and the internal temperature is difficult to accurately acquire in real time in the high-temperature and dynamically-changing complex environment in the traditional method are solved, and the technical effect of accurately acquiring the internal temperature field information in real time in a non-contact manner in the high-temperature and dynamically-changing complex environment is achieved.

The present invention discloses a verticality detection device for building construction, which relates to the technical field of detection equipment. The device comprises an automatic detection system, a locking mechanism, a cone and a cone line. The cone is suspended on the locking mechanism through the cone line. The automatic detection system comprises a monitoring device. The locking mechanism is perpendicular to the building surface to be measured. The monitoring device is used to emit detection light to the building surface to be measured and receive the light by a receiving device on the cone. The automatic detection system determines the verticality of the building surface to be measured based on the emission angle and the receiving angle of the detection light. By providing the locking mechanism and the monitoring device, the present invention eliminates the need for manual multi-point measurement using a tape measure, is simple to operate, and converts the existing multi-point measurement into linear measurement, further improving the measurement accuracy.

The present application relates to a kind of unmanned aerial vehicle impact interception methods based on monocular vision, the azimuth measurement information and angle measurement information of target unmanned aerial vehicle are calculated by target detection algorithm based on monocular vision;Azimuth measurement information and angle measurement information are used, through orthogonal projection matrix and algebraic transformation, non-linear measurement is converted into pseudo-linear form, then pseudo-linear adaptive Kalman filtering algorithm is carried out to estimate the position of target unmanned aerial vehicle, finally, unmanned aerial vehicle maneuvering strategy is used to control impact unmanned aerial vehicle to realize the impact interception of target unmanned aerial vehicle.The method of the present application is obviously improved in system noise robustness, target state estimation accuracy and pursuit efficiency.The present application also relates to impact unmanned aerial vehicle guided by the above impact interception method.

The invention discloses a prefabricated cover beam linear measuring device and a measuring method thereof, and belongs to the technical field of cover beam measurement, the measuring device comprises a supporting unit, the measuring device comprises a base, two vertical plates are vertically and fixedly installed on the base, the two vertical plates are arranged in a bilateral symmetry mode relative to the base, and the measuring device further comprises a measuring unit. The measuring unit comprises a first measuring mechanism for measuring the horizontal length and a second measuring mechanism for measuring the inclination angle. Linear measurement of the horizontal length and the side edge inclination angle of the bent cap can be achieved, the horizontal length and the side edge inclination angle are measured through the same device, the device does not need to be replaced, the detection requirements in two directions can be met through one-time positioning, the precision is higher compared with the mode that positioning and measurement are conducted in the two directions, and the measurement precision is higher. Positioning errors generated in the respective positioning process are avoided, the accuracy of the bent cap measuring result can be better guaranteed, and automatic positioning can be achieved after the positioning block is embedded into the bottom end of the limiting column from left to right.

The invention belongs to the technical field of machine vision nondestructive testing, and particularly relates to a conveying belt thickness measuring device and method and a conveyor. Structured light is projected to a conveying belt through the device, a picture with the structured light on the conveying belt is obtained, sub-pixel processing is conducted on the picture, and a set of two-dimensional coordinates is obtained; a group of two-dimensional coordinates are converted into arithmetic information S through calculation, real thickness information on the conveying belt is obtained, the group of arithmetic information S is corrected, and full-section thickness information of the conveying belt is obtained. According to the method, the visual measurement technology and the linear measurement technology are fused, and the real thickness of the conveying belt is combined with the visual measurement technology; according to the method, the thickness of the whole section of the conveying belt can be accurately measured, parallax and measurement errors possibly caused by factors such as illumination in a traditional method are reduced, high practicability, reliability and safety are achieved, and powerful technical support is provided for maintenance and management of a mining industry conveying system.

The invention relates to the technical field of bearing measurement, in particular to a method for measuring the diameter of a raceway of a bearing inner ring, which comprises the following steps of: selecting a standard steel ball, using simple measuring equipment, forming a simple geometric model according to design parameters of a bearing, and calculating the diameter of the raceway of the bearing inner ring through a trigonometric function relationship and a geometric relationship. In this way, direct measurement of the arc-shaped raceway is converted into linear measurement, and the linear measurement is converted into the diameter of the bearing inner ring raceway through the trigonometric function relation, so that the measurement error can be greatly reduced, the measurement result is more accurate, meanwhile, the measurement efficiency can be improved, and the cost is low.

The present invention belongs to the field of metrology and calibration technology, and specifically discloses a method for optimizing coil parameters of an eddy current sensor, including: determining coil materials and basic size parameters; generating sample data between coil parameters and performance; constructing a BP neural network model, training and fitting the nonlinear relationship between coil parameters and measurement performance; optimizing the BP neural network model and coil parameters using a particle swarm algorithm; and designing and manufacturing an eddy current sensor based on the optimization results. The present invention uses a BP neural network to model the nonlinear mapping relationship between coil parameters and sensor performance, and combines the global optimization capability of a PSO algorithm to achieve intelligent optimization of coil parameters; the sensor coil designed through optimization has good performance and can achieve high-precision linear measurement within a range of 2 to 15 mm.

The invention provides a method for measuring additional phase delay introduced by optical voltage transformer light source wavelength fluctuation. The method comprises the following steps: S1, constructing an optical voltage transformer for realizing linear demodulation of phase delay based on an annular radial polarization grating; the optical voltage transformer comprises a light source, a polarizer, an electro-optical crystal, a quarter-wave plate, an annular radial polarization grating and a four-quadrant detector. An electric field where the electro-optical crystal is located is generated by alternating current voltage to be measured; and S2, modulating a to-be-measured AC voltage into two times of the half-wave voltage of the electro-optical crystal, and obtaining the additional phase delay introduced by the fluctuation of the central wavelength of the light source according to the light spot rotation angle measured by the optical voltage transformer. Direct linear measurement of phase delay is realized based on the annular radial polarization grating, and then additional phase delay introduced by light source center fluctuation is completely extracted and compensated, so that the problem of light source wavelength fluctuation is solved.

The invention discloses an IC board warping degree and curved surface groove detection method based on a three-dimensional point cloud, and the method comprises the following steps: S1, collecting the point cloud data of the surface of an IC board through a three-dimensional imaging device, and carrying out the noise filtering, resampling and attitude normalization preprocessing; s2, nine key points distributed on the surface of the IC board are automatically extracted, a reference surface is generated through a curved surface fitting algorithm based on coordinates of the key points, and the height deviation value of each key point relative to the reference surface is calculated; according to the method, nine key points are selected on the surface of the IC Board, the global reference curved surface is generated by combining the curved surface fitting technology of the three-dimensional point cloud, and errors caused by local height anomaly or measurement noise are effectively avoided. Through the multi-dimensional analysis of the height difference between the central point and the edge point, the quantification of the warping degree is more comprehensive, the measurement result is more stable and reliable, and compared with a traditional single-point or linear measurement method, the method has higher precision and robustness.

The invention discloses a nonlinear measurement value accurate mapping method and system based on a slope dynamic wingspan. The method comprises the following steps: establishing a plurality of data calibration points in one-to-one correspondence between a target domain and a measurement domain; defining calibration point intervals, and establishing a slope wingspan model corresponding to each calibration point interval; collecting a plurality of measurement domain data of the to-be-measured object; calculating through the slope wingspan model of the calibration point interval to which the data of each measurement domain belongs to obtain a corresponding target domain result group; re-integrating the target domain results in the target domain result group to reduce the number of the target domain results; selecting a median of the sorting of the integrated target domain results as a final mapping result; the method is simple and convenient in calculation process, high in mapping precision, high in real-time performance, low in manufacturing cost and easy to implement, and has wide application prospects in the fields of workpiece three-dimensional shape measurement based on the precision measurement technology, object dynamic property change monitoring, precision displacement measurement, trace gas measurement, trace mass weighing and the like.

A feed unit for articles includes a guide extending along a guide longitudinal axis to define a linear feed path for such articles. The guide is for accommodating articles arranged in a row one after the other and to guide the articles as the articles move along the linear feed path. The articles have a characteristic length corresponding to their size along the longitudinal axis. At least one segment of the guide is progressively rotated about the guide longitudinal axis by a total angle greater than 180° and with an angular variation per unit of linear measurement such that, substantially for each portion of the linear feed path equal to the characteristic length of the articles, the guide is rotated about the longitudinal axis by an angle greater than 4°.

An inspection device for measuring micro spring tension. The inspection device includes a guideway and a linearly slidable plate slidably positioned within the guideway and having an elongated opening formed therethrough. The inspection device further includes a load cell fixed relative to the guideway and extending through the elongated opening of the linearly slidable plate. The micro spring is attached between a slide spring attachment fixed to the linearly slidable plate and a load cell spring attachment fixed to the load cell. Finally, the inspection device includes a linear measurement indicator shaft and one or more processors for outputting to a user interface or an external system a load associated with signals from the load cell and / or a distance associated with signals from the linear measurement indicator shaft.

The invention discloses a seamless range switching system and a seamless range switching method for instrument current measurement. The seamless range switching system comprises a digital-to-analog converter, an error amplifier, a first driving circuit, a first current measurement circuit, a clamping circuit, a second driving circuit, a second current measurement circuit, two analog-to-digital converters and a field programmable gate array. The first current measuring circuit converts 10 [mu] A to 30 mA low current into a first voltage signal to form a negative feedback closed loop. When the first voltage signal reaches a Zener breakdown threshold value, the clamping circuit outputs a trigger signal to start the second driving circuit, so that the two driving circuits jointly provide a total current of 30mA to 500mA for the load; the two analog-to-digital converters perform synchronous sampling, and the field programmable gate array selects digital signal output which is in a linear measurement range and has an error not exceeding + / -0.05% of a full scale. No mechanical switch exists in the switching process, the current is uninterrupted, and wide-range high-precision continuous measurement is achieved.

The invention discloses a non-cooperative unmanned aerial vehicle target state estimation method based on MGMEE-SVSF under lattice sampling. The method comprises the following steps: S1, constructing a non-cooperative unmanned aerial vehicle target motion model with an uncertain turning rate and a non-linear measurement model under non-Gaussian noise interference; s2, on the basis of a lattice sampling theory and a smooth variable structure filtering theory, a time-varying smooth boundary layer under turning rate uncertainty and non-Gaussian measurement noise is obtained through a prediction step; s3, quantifying a non-cooperative unmanned aerial vehicle target state estimation error through a time-varying smooth boundary layer, and selecting a mixed generalized minimum error entropy gain or a smooth variable structure filtering gain to perform state updating; and S4, outputting the target state estimation and the state estimation error covariance of the unmanned aerial vehicle. On the premise of ensuring the stability of the estimation system, the state estimation precision is further improved through a gain switching strategy, and the problem of high-precision robust state estimation of the non-cooperative unmanned aerial vehicle target when the turning rate is uncertain and the sensor is in non-Gaussian noise interference can be effectively solved.

The linear measuring system includes one part of a (usually steel) rod, beam or strip that is profiled with a trapezium like (subset of a) De Bruijn sequence. Each element of the alphabet is represented by a discrete height of the profile. The profile can be coated with a material with low magnetic susceptibility to enable the application on a piston rod of a pressure medium cylinder. The second part of the measuring system reads the subsequences of the main sequence by using the signals of arrays of linear Hall effect sensors, placed in a magnetic field as input for a signal processing algorithm. With a look-up table, the position of this second part of the measuring system with respect to the profile is determined. An interpolation algorithm can be used to improve the resolution to well below the sequence pitch.

The invention discloses a magnetoresistance electric settlement meter, comprising an outer protective tube, an electronic compartment, a measuring rod and a cable are arranged inside the outer protective tube, a positioning ring is mounted on one end of the measuring rod, and a control ring is mounted on the other end, the electronic compartment is fixedly mounted on the upper end surface of the positioning ring, an electric control unit is arranged inside, a magnetic induction element is arranged inside the measuring rod, and the electric control unit is connected, an anchor plate and a vernier magnetic ring are arranged on the outer ring of the outer protective tube, and the cable passes through the upper gland and the electronic compartment and is connected to the electric control unit. The magnetoresistance electric settlement meter adopts linear measurement, absolute position output, non-contact continuous measurement, no need for recalibration and regular maintenance, multiple output signal options, such as current 4-20mA or RS485, and simple and convenient installation. The magnetoresistance electric settlement meter is suitable for long-term measurement of layered settlement of earth-rock dams and settlement of embankments and foundations during excavation and loading. It can measure single-point settlement and can also be used as a measurement of multi-point layered settlement.

The utility model discloses a circuit breaker. The service life evaluation unit is used for evaluating the residual electric operation service life of the circuit breaker according to current measurement data records of the current measurement unit; the current measuring unit comprises a first current measuring circuit and a second current measuring circuit which are arranged in parallel; the first current measurement circuit is a current measurement circuit based on an iron core current transformer, a current measurement value ICT of the first current measurement circuit is used as a current basis for circuit breaker protection action judgment, and when the ICT is in a linear measurement range of the iron core current transformer, the ICT is used as current measurement data for recording; the second current measurement circuit is a current measurement circuit based on a PCB Rogowski coil transformer, and the current measurement value IRC of the second current measurement circuit is recorded as current current measurement data when the ICT is out of the linear measurement range of the iron core current transformer. Compared with the prior art, the device can accurately measure the fault current, and further provides an accurate basis for the evaluation of the service life of electric operation.

The invention relates to a water tank water volume ground monitoring system and method based on ultrasonic ranging, and belongs to the technical field of special aircraft task systems. According to the ground water tank water volume monitoring system and method, the water volume height is measured in real time through a non-contact method, the measurement result is transmitted to the water volume panel to be displayed, filling personnel can conveniently monitor the filling condition in real time, the filling efficiency is improved, and the requirements for quick response and fire extinguishing are met. According to the water volume sensor, an ultrasonic ranging scheme is applied to detection of the water volume of the water tank of the fire extinguishing aircraft, real-time water volume data can be obtained through the sensor, external analysis equipment is not needed, an original discrete measurement result is converted into a real-time linear measurement result, and better observability is achieved.

The invention discloses an automobile gap detection device, which belongs to the field of automobile gap detection technology, and comprises a base, a support bracket is installed on the top of the base through a rotating seat, and a limit mechanism is installed in the support bracket. In the invention, by adjusting the position of a laser test element, the laser displacement sensor allows the test laser to pass through the side wall of the cylinder sleeve, and the corresponding side sensing camera acquires the laser data. When the laser is offset or blocked by the gap, the sensing camera can obtain the current test deviation data, and by adjusting the distance of the peripheral laser test element, the laser measurement of the assembly gap of holes with different inner diameters is realized, which solves the technical problem that the traditional laser measurement equipment cannot adjust the measurement range, can adapt to the detection of different assembly gaps and errors, and can adapt to the linear measurement of gaps with aperture changes by adjusting the expansion range of the laser test element during measurement, thereby improving the measurement effect.

The utility model relates to the technical field of engine testing, in particular to an engine oil level rising measuring tool for an engine, which comprises a measuring platform and a measuring piece, and the measuring platform is used for fixing the measuring piece and an engine oil dipstick and providing a linear measuring plane for the measuring piece. And the measuring piece is used for measuring the engine oil liquid level rising amount and the engine oil emulsification amount in cooperation with an engine oil dipstick. The utility model aims to measure the engine oil liquid level rising amount and the engine oil emulsification amount of an engine in various environments, and is simple in structure and high in accuracy.

The invention discloses a segmental beam prefabrication linear measurement method and system based on mixed mark positioning. The method comprises the steps that circular diagonal coding marks are arranged at control points of a fixed end mold and the top of a segmental beam; the circular diagonal coding mark adopts two characteristics of a white positioning circle and a diagonal mark; acquiring a plurality of images comprising all circular diagonal coded marks, and identifying and acquiring the center coordinates of each coded mark in each image by adopting an image processing method; matching marks with the same coded value in different images, and performing initial calculation on camera external parameters of each image and three-dimensional world coordinates of a control point on the top surface of a segmental beam based on known three-dimensional world coordinates of a control point of a fixed end mode; and global joint optimization is carried out on the camera external parameters of all the images and the three-dimensional world coordinates of the control points at the top of the segmental beam to obtain the three-dimensional world coordinates of the control points of the segmental beam. The problems of large manual measurement error, low efficiency and the like can be solved, and automation of linear measurement of the precast beam field is realized.

The application discloses an edge computing network service function chain embedding method based on K shortest path, and aims at a distributed service function chain embedding problem under time delay constraint. In the case of meeting the end-to-end time delay constraint, a service function embedding algorithm based on K shortest path algorithm is designed to minimize the deployment cost. The application firstly proposes a service function embedding problem modeling method based on a weighted layered graph, and converts the service function chain embedding problem into a minimum cost path problem under time delay constraint in the weighted layered graph. Secondly, a service function chain embedding mechanism under time delay constraint is designed based on the weighted layered graph and K-linear measurement aggregation algorithm. Compared with the prior art, the application has better high performance and operability, and has practical significance for complex network applications in edge computing networks.