476results about How to "Realize non-contact measurement" patented technology

The invention relates to a method for measuring the diameter and the straightness accuracy parameters of a seamless round steel pipe. The method includes the steps as follows: accomplishing the calibration of parameters of a multi-linear structured light vision sensor formed by one video camera and multi-line laser projectors; distributing the multi-linear structured light vision sensors on the periphery of the seamless round steel pipe to be tested; respectively controlling the laser projectors to project structured light plane onto the measured section of the seamless round steel pipe by a computer, collecting the images of laser stripes on the surface of the seamless round steel pipe and processing the images of the laser strip by a video camera, and calculating the three-dimensional coordinates of different sections according to a measurement model; determining the elliptical center of each section of the space, realizing the measurement of the straightness accuracy of the seamless round steel pipe and establishing the dynamic and virtual central axis of the seamless round steel pipe; establishing the reference plane of the dynamic and virtual projection of ellipse of the section of the space; and front projecting the ellipse of the section of the space onto the reference plane of the dynamic and virtual projection, and carrying out the operation of circle fitting on the reference plane, thereby obtaining the section circle of the steel pipe. The method can realize the on-line, real-time, automatic and noncontact measurement of the diameter and the straightness accuracy parameters of the seamless round steel pipe.

The invention discloses a fuel particle hot collision recovery coefficient measurement device and a measurement method. A combustion system and a collision system are arranged in a sealed cavity which is connected with a gas source, and the combustion atmosphere can be adjusted by a flow valve; a combustion reaction device is a tubular electrical heating furnace with a temperature control function and can realize heating of the fuel particle; the temperature of the fuel particle is tracked by an infrared thermal imaging instrument, so that the temperature of particle collision in a non-contact manner can be measured; a high-speed camera is adopted to capture the movement images of the fuel particle before and after collision, the speed of the fuel particle before and after collision can be acquired through image analysis and the collision recovery coefficient can be computed. The device can measure the particle collision recovery coefficient in a high-temperature hot state, and has important practical value on the mathematical modeling of a hot fluidized bed; different from the cold state experiment, the hot working status is more close to the real fuel combustion environment in the fluidized bed, therefore, the obtained experimental data can be used for analyzing and judging the agglomeration and caking tendency during fuel combustion.

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 on-line detection device and method of mineral flotation froth flow velocity on the basis of three-dimensional visual information. Kinect is adopted to obtain the color image and the depth information of forth to form the three-dimensional visual information of the forth. A current frame of image and a previous frame of image are subjected to characteristic point extraction and matching in an embedded heterogeneous multi-core processor, and a three-dimensional space coordinate of the image characteristic point is calculated by the pixel coordinate information and the depth information of the characteristic point and a pinhole projection imaging model. The three-dimensional space coordinate and the image acquisition rates of the matched characteristic points of two frames of images are used for calculating a movement rate, i.e., the froth flow velocity of the froth on three dimensionalities. The real-time on-line non-contact detection of the flotation cell froth flow velocity is realized, and the on-line detection device has the characteristics of being small in volume, high in mobility, low in power consumption, low in cost, high in detection speed and high in reliability, is especially suitable for the real-time on-line measurement of the field froth flow velocity index of mineral flotation, and is favorable for realizing the automatic monitoring of a flotation process so as to improve mineral separation efficiency.

The invention discloses a modal test method of a large draught fan blade based on the photography measurement technology. The method comprises steps of using a pair of CMOS/CCD industrial cameras to carry out synchronous shooting on surface images of the draught fan blade under random excitation vibration; identifying and positioning multiple marking points in the images; extracting central sub-pixel level coordinates of the marking points and carrying out stereo matching of the double cameras; calculating three-dimensional coordinates of each measurement point through the three-dimensional reconstruction technology; carrying out micro-division processing on displacement data to obtain required vibration response (speed and accelerated speed) signals; through the Fourier transform, converting time domain signals into observation peak values in frequency domains to find corresponding modal frequencies; by combining analyzed frequency values, further using the stochastic subspace identification method (SSI) to precise calculate modal parameters of the blade; and acquiring the fixed frequency, the vibration mode and the damping ratio of the blade. According to the invention, by use of non-contact type multi-point synchronous vibration measurement, rapid high-precision model test on the draught fan blade can be achieved.

The invention discloses a device for measuring spacecraft structure deformation based on speckle interference and fringe projection. The device mainly comprises a laser speckle projection device, a CCD camera, a fringe projection device, a data acquiring and control unit and the like, wherein local deformation of a measured structural slab is measured by the laser speckle projection device through a laser speckle interference measurement method, and the fringe projection measurement device is used for measuring large-scale deformation through fringe projection measurement and multiple times of measurement data combination. The spacecraft structure deformation is measured based on combination of speckle interference and fringe projection, large-scale and non-contact measurement on the spacecraft structure micro deformation can be achieved, the overall precision can reach 10 microns within the range of 2 m*2 m, and the measurement precision can reach 1 micron within the range of 0.2 m*0.2 m needing local high-precision measurement.

The invention discloses an on-line monitoring device and method for the corona discharge of an ultra-high voltage power transmission line. The on-line monitoring device comprises a sensor unit, a signal conditioning unit, a signal processing unit, a wireless communication unit, an upper computer monitoring unit, a system failure diagnosing unit and a system power supply unit. The on-line monitoring method comprises the following steps of: carrying out signal acquisition for the field working state of power transmission equipment by the sensor unit; transforming data types through the signal conditioning unit to obtain a useful signal which can be identified by a CPU (Central Processing Unit) of the signal processing unit; sending the processed data to the wireless communication unit through a serial port by the signal processing unit; and receiving the data and carrying out failure diagnosis by an upper computer server so as to give the current operation state of the equipment, equipment parameters and a failure diagnosis result.

The invention belongs to the field of machine vision and particularly relates to a hot-rolled strip steel end three-dimensional contour measurement method based on double-line structured light. The method mainly adopts a double-line structured light method to carry out three-dimensional contour measurement of the shape of an end part of a strip steel which runs at a high speed of 120m/min on a hotrolling production line, and comprises operation steps of 1) establishing a system; 2) camera calibration; 3) light plane calibration; 4) solving three-dimensional space coordinates; 5) image acquisition and preprocessing; 6) processing a light bar image; 7) establishing the triangular relationship; and 8) performing three-dimensional reconstruction to obtain a three-dimensional point cloud chartof the strip steel. The method is advantaged in that the double-line structured light is projected to a plane of the end part of the strip steel, an intersection point of a line structured light andan edge of the strip steel is detected through image processing, a point is converted from a two-dimensional coordinate system to a three-dimensional coordinate system according to the structured light triangulation theory, the shape of the end part of the strip steel is obtained, and width of the strip steel is calculated.

The invention discloses a wireless passive capacitive accelerometer comprising a substrate with a closed cavity inside. A mass is fixed in the closed cavity through a cantilever; a first capacitor is arranged above the mass in the closed cavity, and a second capacitor is arranged below the mass in the closed cavity; a plane spiral inductor is arranged on the bottom surface of the substrate, electric connecting lines are sputtered on the substrate and the mass through TSV (through silicon via) technique punching, and the first capacitor, the second capacitor and the plane spiral inductor are in series connection to form a closed loop circuit through the electric connecting lines. The wireless passive capacitive accelerometer is skillful in design, simple in structure, high in sensitivity and accurate in test results, is wireless and passive, and can be used in severe environment; non-contact measurement is adopted during measuring, so that the range of application of the sensor is greatly broadened.

The invention provides a real-time dynamic measurement method for measuring radial clearance between a steam turbine rotor and a stator. The method is characterized in that the method comprises the steps of determining distance measurement devices for radial clearance, determining radial clearance between the rotor and the stator, determining the radial clearance between the rotor and the stator, determining the distance from an emitter to the surface of the rotor, calculating vertical offset amount of the rotor when the center of the rotor shifts, calculating horizontal offset amount of the rotor when the center of the rotor shifts, calculating the rotor offset amount at any position and calculating the radial clearance between the steam turbine rotor and the stator. The method can carry out dynamic measurement on the rotor labyrinth clearance and blade top labyrinth clearance of a running steam turbine accurately and quickly, thereby solving the problem that the measuring error of the radial clearance between the steam turbine rotor and the stator is large and the radial clearance cannot be measured online dynamically and accurately, ensuring safe and economical operation of the machine set and saving halt overhaul time.

The invention belongs to the technical field of optical precision measurement, and relates to a two-dimensional dynamic angle measuring and calibrating method and device of a scanning camera mirror. The two-dimensional dynamic angle measuring and calibrating method and device can be used for measuring and calibrating parameters of the scanning camera mirror in real time. According to the two-dimensional dynamic angle measuring and calibrating method and device, an infinite target generation system is used for generating an infinite target, the infinite target provides a target source for a scanning camera to be detected through the scanning camera mirror for detection, a two-dimensional dynamic angle measuring system is used for performing two-dimensional real-time measurement on the oscillation angle of the scanning camera mirror, a synchronous acquisition system is used for synchronously acquiring data of the scanning camera to be detected and data of the two-dimensional dynamic angle measuring system in real time, and the data of the two-dimensional dynamic angle measuring system are used for calibrating the scanning camera mirror. The two-dimensional dynamic angle measuring and calibrating method and device of the scanning camera mirror have the advantages of being high in speed, wide in range, free of contact and the like and provide an effective solution for measurement and calibration of the parameters of the scanning camera mirror.

The invention relates to a gas-liquid two-phase flow pattern recognition method based on digital image processing technology, which is characterized in that the method uses a high-speed camera to gain the gas-liquid two-phase flow image in a horizontal pipeline under the different working conditions; the characteristics of invariant moment and gray level co-occurrence matrix of the image are extracted by the image processing technology; the characteristic fusion is implemented by using a rough set theory to reduce the characteristic dimensions, and the characteristic vector forms a flow pattern sample to implement the training for a support vector machine in order to complete the mapping from the characteristic space to the flow pattern space and finally realize the flow pattern recognition. The adopted rough set theory fuses image texture information and shape information, improves the recognition precision of a classifier, simultaneously reduces the training time, and can roundly reflect the characteristics of flow pattern image; the dependent degree and the generalization capacity of the flow pattern recognition method of the support vector machine for the sample data are better than the BP neural network; the invention has the shorter training time, and is applied to the flow pattern online recognition.

The invention discloses a non-contact tube pass fluid temperature measuring method based on temperature measurement of a pipeline outer wall. The measuring method includes the steps that pipeline and external environment parameters are collected, and the flow speed of internal fluid is determined, so that the pipeline heat transfer process is divided into natural convective heat transfer between the pipeline outer wall and air, pipe wall heat conduction and forced convective heat transfer between the pipeline inner wall and water at three levels; a heat transfer expression is obtained after a radial-direction heat transfer model of a pipeline is set up, the expression is iteratively and repeatedly calculated to obtain the needed tube pass fluid temperature value. The non-contact measurement of the tube pass fluid temperature is achieved, the applicability is good, on the premise of guaranteeing real-time performance, measurement accuracy and detection efficiency are improved, and the non-contact tube pass fluid temperature measuring method can be suitable for fast measuring tube pass fluid temperature under various conditions.

The invention discloses a PCB coil and an angle measuring method for an electromagnetic induction type angle sensor apparatus. The PCB coil and the angle measuring method for the electromagnetic induction type angle sensor apparatus comprise a receiving coil for receiving a signal sent by a rotor reflection coil, an excitation magnetic field rotor reflection coil for receiving stator transmitting coil, and the stator reflection coil for sending an excitation signal to the rotor reflection coil; the receiving coil and the stator transmitting coil are connected and fixed to a stationary rotation shaft, the rotor reflection coil is arranged on a sensor rotor, the three coils are coaxially and fixedly arranged in parallel, the rotor reflection coil comprises an annular coil portion and a copper portion, and the annular coil portion and the copper portion are fan-shaped. The PCB coil and the angle measuring method for the electromagnetic induction type angle sensor apparatus can implement non-contact angle measurement, has the advantages of high accuracy, low cost, installation convenience, maintenance and management easiness and low environmental requirements, can accurately, stably and quickly complete tasks and solves many problems such as reliability, accuracy and cost of angle measurement methods.

The invention discloses a site target emissivity measuring system and method based on the environmental radiation change. The system comprises a target, a spectroscope and an infrared detector, wherein the target, the spectroscope and the infrared detector are sequentially arranged in the optical path direction and located on the same optical axis. The system further comprises a black body and a collecting lens. Radiation light of the black body converges on the spectroscope through the collecting lens, is reflected to the target through the spectroscope, acts on the target, then is reflected to the spectroscope and reaches the detector. The method includes the steps that firstly, radiometric calibration is conducted on the infrared detector; a system response function is established with the radiation of the black body serving as the standard; an output response value V1 of the infrared detector is measured under the condition of the environmental radiation intensity Vs1; an output response value V2 of the infrared detector is measured when the condition is changed into the environmental radiation intensity Vs2; according to the output response values measured under the two different radiation intensity conditions of the infrared detector, the reflectivity and the emissivity of the target are calculated. According to the system and method, necessary parameters are provided for infrared radiation non-contact accurate temperature measurement.

The invention provides a precision measurement device and a measuring method based on workpiece surface appearance. Emergent light of a laser generates multi-level diffraction light after passing through a grating, the plus or minus 1 level diffraction facula is coupled into two fibers through a focus lens, two coherent point light sources are formed at the exit end of the fiber; the light beams emitted by two fiber point light sources have the same light intensity, therefore, a high contrast interference stripe is obtained and projected on the workpiece; when a piezoelectric ceramic drives the grating to carry out sinusoidal vibration, the position of the plus or minus 1 level diffraction facula coupled into two fibers is not changed, but the phase of the interference stripe generated by two fiber point light sources changes periodically; and the interference stripe image on the workpiece surface is acquired by a high-speed CCD image sensor, and the phase change of the interference stripe image is accurately measured by a sinusoidal phase algorithm. The invention overcomes influence to the object surface profile precision measurement by the light intensity and the wave motion of wavelength, and achieves the characteristics of the large measuring range, high precision and non-contact measurement.

A device that adopts a laser displacement sensor for achieving non-contact measurement of curvature radius is a curvature radius measurement device in the field of optoelectronic measuring technology. The technical problem of the invention to be solved is that the device adopting laser displacement sensor for achieving non-contact measurement of curvature radius is provided. The technic proposal of the invention includes a grating stator, a grating dynamic device, a laser displacement sensor, a processor, a grating data acquisition card and computer. The grating dynamic device can move along the direction of the length, the grating dynamic device is connected with the grating data acquisition card by wire, the output of the grating data acquisition card is connected with the input of the computer; the laser displacement sensor is arranged on the movable grating dynamic device and moves along with the grating dynamic device, the measurement head of the laser displacement sensor is towards to the measured workpiece, the output of the laser displacement sensor is connected with the input of the processor, the output of the processor is connected with the input of the computer. The device can measure large curvature radius.

The invention discloses a method and a measuring device thereof for measuring the granularity distribution of the particle in the discrete state, and the method and the measuring device thereof to the technical field of ultrasonic measurement. The invention aims at solving the technical problem of non contact measurement of the distribution of the particle granularity in the discrete state. The measuring device includes a computer which applies a complex wave number, a objective function, a distillation function and other calculation formulas to optimize the calculate the distribution of the particle granularity, a signal process circuit which is connected with the computer, a pulse wave launch/receive circuit which is connected with the signal process circuit, a broadband transducer which is connected with the pulse wave launch/receive circuit, and broadband transducer is arranged at the external side of a test plate. The measuring device is controlled by the computer, and the launch circuit sends out a pulse signal; a trigger transducer sends out the sound wave which is reflected by the wall of the test plate for a plurality of times and then is received by the transducer, and then the signal process circuit amplifies the signal, the high speed module coverts the signal and sends to the computer for processing. The invention is characterized in that the invention can completely realize the non contact measurement, and measure the high consistency and the two-phase flow of the high attenuation particle on line.

The invention discloses a medium or heavy steel plate morphology detection system based on a controllable symmetrical double-line laser angle, and a method thereof. A sensor cabinet is internally provided with two planar array CMOS cameras in an equal-height plane. Each planar array CMOS camera is provided with a camera lens and furthermore is fixed on a bracket through a mounting device. Two sides of the planar array CMOS camera are respectively provided with a linear laser source. A pulse speed testing velocimeter is fixed at the side of a conveyor belt. The to-be-measured medium or heavy steel plate is placed on the conveyor belt. The to-be-measured medium or heavy steel plate is provided with the laser ray overlapping area of the symmetrical linear laser sources. Correlation is formed between a photoelectric switch transmitter and a photoelectric switch receiver. The sensor cabinet is placed on a bracket. A detecting device is controlled by a control device. According to the medium or heavy steel plate morphology detection system, simple calibration method is realized in detecting by two symmetrical linear laser sources, and furthermore high detection resolution and high precision are realized. The detecting system with two symmetrical linear laser sources is adopted, thereby realizing large incident angle of the linear laser, preventing detection inflection point failure, reducing drift and ensuring accurate and reliable result.

A laminated arc heater high-enthalpy airflow parameter diagnosis system is used for obtaining the airflow parameters (particle number density and static temperature) of a high temperature flow field in the ground heat protection test of an arc heater, and online diagnosing high temperature disassociated air test airflow in the arc heater by using an atom O (777.19 nm) spectral line to obtain the plasma airflow temperature and the atom oxygen particle number density in the arc heater. The system can be used as a routine way for the arc heater high-enthalpy airflow parameter diagnosis.

The invention discloses a measuring apparatus and a measuring method of a station platform gauge. The apparatus comprises a vehicle body, a measuring mechanism and a control module, the vehicle body comprises a vehicle frame, a fixed wheel group adjusting wheel mechanism and a walking driving mechanism, the measuring mechanism comprises a box body, a laser range finding sensor and a laser drivingmodule, and the control module comprises a walking control module, a laser control module and a handheld control terminal. The measuring method includes: step 1, extension of an adjusting wheel assembly; step 2, walking of the measuring apparatus of the station platform gauge; step 3, measurement of the station platform gauge; step 4, repetition of step 2 and step 3 until completion of the measurement of the whole platform gauge; and step 5, contraction of the adjusting wheel assembly. According to the measuring apparatus and the measuring method, the design is reasonable, the operation is simple, the usage effect is good, the station platform gauge is automatically measured, non-contact measurement is realized, the measuring efficiency is high, the manpower and material resources are reduced, the size is small, the cost is low, and the practicality is high.