1753results about How to "Reduce cost of measurement" patented technology

The invention discloses a method for measuring the three-dimensional position and the stance of an object with a single camera. The method comprises the following steps of: acquiring an image of a target to be measured by utilizing a single camera; confirming the real-time three-dimensional position and stance information of the target to be measured by accurately identifying marking points on the target to be measured; selecting a suitable camera according to a detection scene and a range and calibrating the camera to acquire inner and outer parameters of the camera; designing target marking points according to the target to be measured and reasonably arranging the marking points; then, detecting the target, identifying characteristic points according to the image shot by the camera, and matching the detected characteristic points with the marking points; and finally, solving the three-dimensional position and stance information of the target to be measured according to the corresponding relation between the measuring points and the object marking points. Whether a non-rigid object is deformed or not can also be detected by using the method. In the invention, the single camera is adopted to realize three-dimensional measurement, acquire the information of the target in a three-dimensional space, such as space geometrical parameters, position, stance, and the like, decrease the measuring cost and the size of a measuring system, and facilitate the operation.

The invention discloses a method for quickly measuring a blade of a large-sized water turbine, which is characterized by comprising the following steps: firstly, sticking a mark point to the surface of the blade, then shooting a group of photos from different angles as measured primary data, and inputting the data to a computer to carry out analytic processing; by carrying out image detection for the group of photos in a measurement software, identifying the mark point in each photo and positioning the center of the mark point, and matching the mark points with the same name; finally, reconstructing a three-dimensional coordinate of corresponding object points according to a plurality of two-dimensional coordinates of the mark points, fitting a sparse framework model of a target by the reconstructed three-dimensional mark points, then scanning the surface of the blade block by block by using a binocular grating scanning method to acquire a local dense point cloud, and aligning the dense point cloud to an overall coordinate system according to the local mark points to acquire a dense point model of the blade; and by comparing the dense point model with a CAD designed model after aligning, calculating a three-dimensional processing error of the surface of a workpiece.

The invention relates to a human body measurement method, in particular to the non-contact human body measurement method for clothing design which belongs to the technical field of clothing design. The digital images of the front surface and the side surface of the human body are firstly obtained; the extraction of the image edges are carried out by adopting the color segmentation, the best threshold segmentation, the hole filling, the opening operation and the pixel communication image processing method, thereby obtaining the image edges of the front surface and the side surface of the human body; the human body measurement feature points and the lines are determined, the corresponding height and width measurement data of the human body for the clothing design are obtained by calculation; a mathematical model is established by applying the width and the thickness data of the human body to obtain the related circumference data, and the human body circumference measurement data for the clothing design is obtained by BP neural network simulation and regression prediction treatment. The method has simple device, convenient operation and low measurement cost, thereby being capable of meeting the requirements on the design and the production of the clothing industry and having broad popularization and application prospects.

The invention relates to a magnetic field measuring device based on a visual guiding robot, which is characterized by comprising an adjustable workbench, a measuring system, a robot system and a control system which are matched with each other and have a modular design, wherein the adjustable workbench mainly consists of a base, there sets of adjusting mechanisms, a component placing table, foundation wheels and an adjustable support leg, and the gesture of the adjustable workbench can be adjusted by a hand wheel; the measuring system comprises a gesture measuring device of an object to be detected, a visual guiding positioning device and a magnetic field data collecting device; the gesture measuring device of the object to be detected mainly comprises a number dialgauge and a connecting rod; the visual guiding positioning device mainly comprises an integral camera and an image collecting card which are connected by cables; the magnetic data collecting device mainly comprises a multifunctional data collecting card, a teslameter and a Hall probe which are connected by cables; the robot system comprises a three-dimensional right angle coordinate robot; and the control system comprises an industrial personal computer and software.

The invention provides an energy method-based high-temperature radiation rate measuring device of a semi-transparent material and a revising method for deducting background radiation, relating to a high-temperature normal spectral radiation rate revising and testing method of the semi-transparent material and belonging to the technical field of high-temperature material physical property measurement. The energy method-based high-temperature radiation rate measuring device of the semi-transparent material and the revising method for deducting the background radiation solve the problems of high construction cost, low temperature heating upper limit and lower testing precision of the traditional test system. The high-temperature radiation rate measuring device comprises a Fourier infrared spectrum analyzer, a reference blackbody furnace, a rotatable reflection mirror, a heating furnace, a heater, a temperature collecting device, a temperature routing inspection operation instrument, an incidence light source, a data processing system, a diaphragm and a semi-transparent test piece; the heating furnace is internally provided with a light-transmitting opening, a fixing device of the semi-transparent test piece, and the temperature collecting device; the central axis of a light-emitting opening of the incidence light source, the central axis of the light-transmitting opening of the heating furnace, the mirror surface of the rotatable reflection mirror and the central axis of the light outlet opening of the reference blackbody furnace are collinear with a horizontal axis. The energy method-based high-temperature radiation rate measuring device of the semi-transparent material and the revising method for deducting the background radiation, disclosed by the invention, are used for measuring the high-temperature spectral normal radiation rate of the surface of the semi-transparent material.

The invention discloses an integrated online monitoring system for drainage pipeline liquid level and flow. The system is composed of a data center and at least one monitoring subsystem. Each monitoring subsystem comprises a monitoring point and a monitoring device installed on the monitoring point. The monitoring devices collect related monitoring data of the monitoring points and send the monitoring data to the data center for processing and real-time dynamic displaying. The integrated online monitoring system for the drainage pipeline liquid level and flow can be applied to liquid level and flow online monitoring, waterlogging or overflowing early warning and alarming, monitoring data public issuing, monitoring data statistic analysis and the like of point locations such as a drainage pipeline, a drainage channel, a drainage inspection well, a drainage opening, a city sunken road, a city underground parking garage and a city receiving water body.

The present invention relates to the technical field of electrical engineering and discloses a PRBS disturbance injection-based power grid impedance online identification device. The device is mainly composed of a grid-connected inverter, a current loop controller, a sampling device and an impedance identification unit. The device is characterized in that the grid-connected inverter is connected with the current loop controller. When the grid-connected state is stable, the grid-connected inverter injects the PRBS disturbance into the power grid. During the injection process of a PRBS signal, a built-in output voltage THD is fed back to the controller, so that the THD value of the output voltage of the inverter is ensured to be smaller than 5%. The sampling device is connected with the PCC part of the power grid and is used for sampling and recording the voltage and the current at the PCC part of the power grid. The impedance identification unit is used for subjecting the sampled data of the sampling device to DFT analysis, and taking the average value of the amplitude and the average value of the phase of each harmonic component of the voltage and the current during the current sampling period. The method of the invention is high in precision, high in speed, strong in real-time property, wide in frequency range, lower in measuring cost and difficulty, and better in stability.

Wherein, with embed-meter method, applying split-core current transformer (PT) and split-core current transformer (CT) with same wire number as the tower ground wire to clamp all tower ground wires; or applying strip-shape PT and CT to enclose whole tower; filtering and analyzing the measured data to obtain the real and imaginary parts of fundamental wave component of voltage and current signals; calculating with special voltage-drop algorithm to obtain the target resistance. This invention improves efficiency, and reduces cost.

The present invention provides 3D mirror object surface outline measuring device and method. The measuring device consists of LCD panel display, industrial video camera, computer and guide track. The LCD panel display is fixed on the guide track and connected via electric cable to the computer, and the industrial video camera is connected via video line to the computer. The measuring method includes device regulation, data acquisition, data processing and other steps. The device of the present invention is simple in composition, and the measuring method is simple and has data processing with less complexity.

The invention discloses an automobile gravity center slip angle measuring method which comprises the following steps: using a sensor to measure the lateral acceleration ay, the yaw velocity omega r and the longitudinal velocity Vx, gamma and theta of an automobile in the travelling process; using a linear two-freedom model to carry out dynamic parameter estimation so as to obtain the first automobile gravity center slip angle beta L; using a filtering algorithm of a non-linear three-freedom automobile model to estimate the second automobile gravity center slip angle beta N in an integration manner; and using the following formula of beta = (1-zeta) beta L + zeta beta N to calculate out the automobile gravity center slip angle beta. According to the automobile gravity center slip angle measuring method, only the sensor is utilized to measure the three parameters of the lateral acceleration, the yaw velocity and the longitudinal velocity in an automobile running process. Thus, the calculation accuracy is guaranteed while the calculated amount is small.

A pile foundation tower footing impedance measuring device and method thereof, relate to an overhead transmission line tower footing impedance measuring device and method thereof. The device comprises an auxiliary electrode, a high accuracy flexible Roche coil current sensor, a tower footing impedance measuring device or the like. The footing impedance of the pile foundation tower is measured by program. The invention has features: simple structure, low cost, easy operation, wide measuring current range, strong antijamming capability, high measuring accuracy and low measuring cost, therefore the invention can be widely used for measuring the overhead transmission line tower footing impedance, especially for measuring the tower footing impedance without down lead, incapable or inconvenient of unfastening the down lead, avoiding unfastening the down lead.

The invention provides a component different-surface-parallel-hole form and position deviation visual measuring method and device. The method comprises the following steps which are carried out in sequence: [1] binocular camera parameter calibration; [2] different-surface-parallel-hole feature analysis and treatment of a component entity image; [3] different-surface-parallel-hole match feature point extraction of the component entity image; [4] component different-surface-parallel-hole three-dimension information reconstruction, and analysis and calculation of form and position deviation parameters such as diameter, circular degree, hole pitch and depth distribution of holes. According to the invention, measurement of the component feature hole form and position deviation can be completed rapidly and effectively, precision requirements of high-precision measurement can be met, and advantages of simple measurement operation, low equipment maintenance cost and the like can be achieved.

To eliminate the necessity of a dedicated optical system and the flowing of fluorescent microparticles for aligning excitation light with a flat plate-shaped flow cell which internally includes a flow path, a microorganism testing apparatus includes: a first detector that detects fluorescence emitted from microorganisms flowing through a detection flow path when a microorganism detection unit included in a microorganism testing chip is irradiated with excitation light, and converts the fluorescence to an electrical signal; and a second detector that detects scattered light similarly emitted from the microorganisms flowing through the detection flow path, and converts the scattered light to an electrical signal. The alignment of the detection flow path is performed in the direction of the optical axis of the excitation light by controlling and moving a stage having the microorganism testing chip mounted thereon based on the intensity of fluorescence detected by the first detector.

The invention discloses a measuring device and a measuring method for frequency response of a mach-zehnder electrooptical modulator, which belong to the field of photoelectronic technologies, and aim at overcoming the problems of low frequency resolution, difficult calibration and high bandwidth requirement in the existing measurement. The measuring method comprises the steps of: transmitting a beam of light carrier into a mach-zehnder electrooptical modulator to be measured directly, utilizing a first signal source and a second signal source which are applied on a driving electrode and a third signal source applied on a bias electrode of the mach-zehnder electrooptical modulator to be measured for modulation, wherein the first signal source and the second signal source output sinusoidal signals with frequency difference, and the third signal source outputs a low-frequency signal; transmitting a light modulation signal into a photoelectric detector directly to perform beat frequency operation, extracting amplitudes of three specific frequency mixed signals from a beat frequency signal, and acquiring a modulation factor and a half-wave voltage of the mach-zehnder electrooptical modulator to be measured at single modulation frequency; and scanning frequency of an RF signal to obtain frequency response of the mach-zehnder electrooptical modulator to be measured.

The invention relates to a system for measuring half-wave voltage of a phase modulator and a measurement method. The measurement system comprises a laser generator, a polarization controller, a microwave signal generator, an optical interferometer, a power meter and a processor. The method comprises the following steps of: connecting a phase modulator to be measured into a detection system; determining working parameters of the system, and adjusting working conditions of the system; measuring optical power values under the condition of modulating microwave signals with different amplitudes, and comprehensively processing data; and measuring the half-wave voltage at different frequencies. By the system and the method, all the parameters measured at the same detection frequency are comprehensively processed by the characteristic of high resolution of modulation signals generated by the microwave signal generator to obtain a half-wave voltage value at the frequency, and the half-wave voltage value is circularly processed to obtain half-wave voltage values at various detection frequencies; and therefore, the system and the method have the characteristics that the system and the method are high in resolution of measurement frequency, the phase modulator has a plurality of measurement frequency points and a plurality of half-wave voltage measurement values and is high in accuracy, the using performance of a high-speed phase modulator can be exerted, the system and the method are systematical in measurement and low in measurement cost, and the like.

The invention discloses an efficient and convenient and quick simple robot calibrating method, and relates to the field of robot zero position calibration. The robot calibrating method comprises the following steps that 1) keeping cuspidal points of measuring tools opposite all the time after the mounting is completed, manually teaching a robot, and recording corresponding joint data and joint axis data of N points; 2) constructing homogeneous matrices of various axes according to the joint axis data, and then multiplying the homogeneous matrices in sequence, thus obtaining an overall homogeneous matrix; 3) giving basic data, and constructing a positive movement homogeneous matrix based on the overall homogeneous matrix; and 4) adding the joint data to a given error parameter, thus obtaining a joint angle matrix, and substituting the joint angle matrix in the positive movement homogeneous matrix for optimizing, thus obtaining an error, and then compensating the error to a robot zero position, thus completing the calibration. The problem that the robot control precision is low due to the fact that a calibration instrument and software combined process adopted for existing zero position calibration is complicated in procedure and high in cost and the zero position calibration practicability of a calibration instrument and software is poor is solved, and the effects that zero position calibration by pure software is realized, the practicability is improved and precision control is realized are achieved.