3115results about How to "Guaranteed measurement accuracy" patented technology

The invention is applicable to the technical field of laser processing, and provides a precision vibration mirror correction system and a precision vibration mirror correction method. The vibration mirror correction system comprises a vibration mirror correction target, a charge coupled device (CCD) image acquisition device, a two-dimensional motion platform device and a correction processing module, wherein an appointed mark point is marked on the correction target by a vibration mirror scanning module through laser reflection; the CCD image acquisition device performs image acquisition on a standard mark point marked by a vibration mirror; the two-dimensional motion platform device executes a high-precision positioning motion so as to guarantee the positioning precision; and the correction processing module calculates an image acquired by the CCD image acquisition device, finds out a position deflection of the mark point of the vibration mirror correction target and generates a vibration mirror compensation file to correct the vibration mirror. The vibration mirror correction system can realize high-precision correction of the vibration mirror conveniently and quickly.

It is an optics array co-focus ultra-resolution micro three-dimension detection device, which comprises spot light source, calibration lens, microscope array and pinhole array, beam expansion lens, polarization light-splitting lens, a quarter of wavelet, binary iris filter, lens, carrier bench, collection lens, detection probes array and surface array CCD. The spot source forms parallel light through calibration lens into the micro lens array and then forms spot light array onto the beam expansion lens focus plane through pinhole array and forms polarization light through polarization light-splitting lens and a quarter of wavelet and emits onto the object surface to be measured through binary iris filter and lens.

A stereoscopic vision detecting method for measuring three-dimensional morphology on a strong reflection surface is provided. A traditional stereoscopic vision detecting method based on the sine stripe projection comprises steps of stripe projection, image collection, phase resolving, stereoscopic matching and three-dimensional recurrence, and the invention adds new technologies, such as bright-dark stripe projection, image collection in long exposure time, image synthesis within high dynamic range and the like in the steps of the strip projection and the image collection, which overcomes saturated or darker stripe images caused by the strong reflection surface, and can realize the non-contact optical measurement of three-dimensional morphology on the strong reflection surface such as metal. The detecting method has the characteristics of simpleness, flexibility and excellent reliability, and can be used for the optical non-contact measurement of three-dimensional morphology on the strong reflection surface such as metal.

The invention relates to an attitude testing apparatus and method based on an autocollimator. The apparatus mainly comprises the autocollimator, an optical hexahedron, a double-shaft electronic level meter and a pedestal with a leveling function. The method comprises the following steps: putting the attitude testing apparatus on a firm base, allowing the autocollimator to collimate a reflecting surface of an object, then collimating the optical hexahedron with an autocollimation gyro theodolite and measuring the included angle between the apparatus and a true north azimuth reference; starting the autocollimator for recording and retrieving of continuous data of the attitude of the reflecting surface of the object and starting the double-shaft electronic level meter for recording and retrieving of continuous data of horizontal attitude; and after completion of recording and retrieving of the data, processing the data of the autocollimator and the double-shaft electronic level meter by using a data processing method for the attitude testing apparatus so as to eventually obtain continuous changes of the attitude of the reflecting surface of the object in a geographic coordinate system, thereby meeting demands of continuous absolute measurement.

The invention discloses an aviation engine blade profile three-coordinate measuring method which is used for solving the technical problem that an existing blade profile three-coordinate measuring method is low in accuracy. According to the technical scheme, the aviation engine blade profile three-coordinate measuring method comprises the steps of based on extraction of a plurality of curves which can represent the blade profile main-axis direction curvature distribution characteristics, calculating curve control point sets to determine the blade measurement cross sections, based on curvature distribution and tolerance control, planning the minimum control point set of each measurement cross section, and achieving the three-coordinate measurement path planning of the blade profile. According to the aviation engine blade profile three-coordinate measuring method, the blade measurement cross sections are planned according to the blade profile curvature distribution characteristics, the measurement point set of each measurement cross section is planned based on the curvature and the tolerance control, the measurement workloads are reduced, and the measurement accuracy is ensured. The problem that the workloads are greatly increased due to the facts that in the traditional measurement work, the measurement cross sections are planned according to experience and the measurement accuracy is ensured by encrypting the measurement cross sections and the measurement points is solved.

The invention provides a camera calibration method for large field-of-view high-accuracy vision measurement and belongs to the fields of measuring and testing. According to the camera calibration method for the large field-of-view high-accuracy vision measurement, a single infrared light-emitting diode (LED) with self-adapting brightness is used as a target spot, and the target spot is fixed on a three-dimensional numerical control mechanical device and is controlled to move to a preset space position. A virtual stereo target is constructed in three-dimensional space. When the target spot reaches the preset space position, a camera subjects the target spot to image acquisition. The virtual stereo target is shot in a plurality of directions by means of freely moving the camera, so that a plurality of virtual stereo targets are distributed in calibration space of the whole camera, when the shooting of the virtual stereo target in each direction is achieved, a set of inner parameters and a set of outer parameters are calculated to serve as trailing optimized initial values. Finally, the calibration parameters of the virtual stereo target shot in multiple directions are subjected to whole optimization. The camera calibration method for the large field-of-view high-accuracy vision measurement can effectively improve the accuracy of the large field-of-view camera.

The invention provides a method and a device for double-star time difference/frequency difference combined positioning. By using the method, the calculation efficiency and the measurement accuracy of the time difference and the frequency difference can be improved. According to the scheme, the method comprises the following steps of: (1) carrying out time difference-frequency difference combined coarse estimate, calculating A(tau, f)=FFT[r(n; tau)], directly measuring the carrier frequency of a composite signal FORMULA for the search of the time difference each time, labeling a frequency spectrum amplitude value and a time difference value and finding out a maximum position, wherein tau is equal to tau1, tau2, FORMULA and tauM; (2) extracting and filtering the composite signal FORMULA, then measuring the carrier frequency, and coarsely estimating the frequency difference; (3) accurately calculating the frequency difference in the adjacent domain FORMULA of an estimated value in the coarsely measured frequency difference and accurately estimating the frequency difference; (4) accurately calculating the time difference in the adjacent domain FORMULA of an estimated value in the coarsely measured time difference and accurately estimating the time difference; and (5) accurately estimating the time difference, estimating the time resolution 1/Ts of the time difference by using a relevant method and improving the time difference estimate accuracy by using interpolation, wherein Ts is the sampling interval of signals. In the invention, the time difference is calculated by using the signals with a high sampling rate, the frequency difference is calculated by using the signals with a low sampling rate, and the problems of the calculation efficiency and the measurement accuracy of the time difference and the frequency difference are solved by combining the time domain processing with the frequency domain processing.

The invention discloses an ultrasound bone density measuring and analyzing system. The system comprises an ultrasound parameter measuring apparatus, a communication interface and a human machine interaction device, wherein the ultrasound parameter measuring apparatus comprises transmitting unit consisting of a pulse generator, a high-voltage pulse excitation module and a transmitting probe, an ultrasound receiving unit consisting of a receiving probe, a simulation pretreatment module, a gain adjustable amplifier, a phrase comparator, a high-speed ADC and an asynchronous FIFO, and a central processor, a power supply control module and a structural body. the human machine interaction device controls the ultrasound parameter measuring apparatus through the communication interface to measure the width of a calcaneus of a detected person, the transmission speed of an ultrasound wave in the calcaneus, broadband ultrasonic attenuation to calculate the bone intensity indexes and the bone density, so a medical report can be made according to diagnostic standards of osteoporosis and a special data base can be built for long term use. The system adopts wet or dry coupling and other technologies to improve the precision and accuracy of measure and has the advantages of easy carrying, low cost, no damage caused by radiation and can be use in long term monitoring of bone condition of the detected person.

The invention discloses a multi-rotor unmanned aerial vehicle environmental autonomous monitoring control system and method. The system includes a multi-rotor unmanned aerial vehicle, a ground communication conversion system and a mobile terminal. The multi-rotor unmanned aerial vehicle includes an unmanned aerial vehicle control system and an unmanned Motor power system; the UAV control system is used to control the operating state of the multi-rotor UAV, including ascent, hovering, obstacle avoidance and falling, and conduct multi-dimensional automatic monitoring of pollutants in the air during operation, and will The collected data is sent out; the ground communication conversion system is used to receive the data collected by the UAV, send it to the mobile terminal, and receive the control command from the mobile terminal, and send it to the UAV. The invention can ensure the measurement accuracy under the condition that the posture of the UAV is stable, and realize the concentration detection of multi-dimensional and different pollutants.

The invention discloses an electronic mutual inductor test system and a test method. The electronic mutual inductor test system comprises a standard device, a signal conversion device, an error measuring device, a test power supply, a merging unit and a tested electronic mutual inductor, wherein the standard device is used for providing a standard signal serving as a test reference; the signal conversion device is used for receiving the standard signal and converting the standard signal into an analog signal which can be acquired by the error measuring device; the test power supply is used for outputting a primary voltage and a primary current for test use; the merging unit is used for receiving a digital signal output by the tested electronic mutual inductor and processing the digital signal; and the error measuring device is used for receiving the standard signal output by the signal conversion device and the digital signal output by the merging unit, and acquiring the ratio difference and the phase difference of the tested electronic mutual inductor. The electronic mutual inductor test system is particularly suitable for a field error test of the electronic mutual inductor, andhas the advantages of convenient test work, high reliability, small equipment volume, light weight, high test result accuracy and the like.

The invention discloses a piezoelectric-type flexible three-dimensional tactile sensing array and a preparation method of the same. The tactile sensing array is successively constituted of a PDMS superficial raised layer, an upper electrode layer, a PVDF piezoelectric thin film layer, a lower electrode layer and a PDMS flexible basal layer from top to bottom, wherein the upper and lower electrode layers are distributed in a patterned manner, the PVDF piezoelectric thin film layer is sandwiched in the middle to form a plurality of piezoelectric capacitances, and electric charges are generated by upper and lower electrodes of the piezoelectric capacitances under effects of force; the whole array is constituted of six three-dimensional tactile sensing units which are arranged in two lines and three rows, and a spatial resolution rate reaches 8 mm; and each three-dimensional tactile sensing unit comprises a quadrangular-frustum-shaped raised part and four piezoelectric capacitances, external three-dimensional contact force is transmitted by the quadrangular-frustum-shaped raised part to the four piezoelectric capacitances, and the external three-dimensional contact force is measured by generation of a charge combination of the four piezoelectric capacitances. The piezoelectric-type flexible three-dimensional tactile sensing array and the preparation method of the same disclosed by the invention are advantageous in that multi-dimensional force simultaneous measurement is realized, flexibility is applicable to hook face assembly and dynamic responses are good.

A transducer is featured as fixing one end of suspension arm and another end set with frictional head, forming both of vertical and horizontal bent beam by elastic body and sticking foil gauge on the elastic body to make it full bridge circuit. In frictional test, strain deformation of horizontal bent beam is caused by normal load and strain deformation of vertical one is caused by only frictional force so the load and frictional force can be measured out through strain detection.

The invention relates to a railway locomotive running attitude measuring method comprising the following steps: a high-speed camera is fixedly arranged on at least three non-colinear points of the railway locomotive under measurement by taking surfaces of rails as the measuring datum; along with the running of the railway locomotive under measurement, the high-speed camera shoots the running imagesequence of an counterpart camera arranged on the top surface of the rails; the running image sequence of the counterpart camera is processed and analyzed, and the offset of each point relative to the rails is obtained; the special attitude and the offset of the railway locomotive under measurement relative to the two rails are determined according to the offset of three measuring points, and accordingly the dynamic offset of any point which is fixedly connected with the railway locomotive under measurement is obtained; the dynamic envelop curve of the railway locomotive under measurement isobtained according to the dynamic offset of the key point on the profile of the railway locomotive under measurement; the dynamic envelop curve is compared with the building profile, and the ultralimit early warning and alarming is carried out if a monitoring point is close to or exceeds the building clearance. The invention ensures the railway locomotive running attitude measuring precision whenthe dynamic displacement of the railway locomotive is measured on line in real time.

The invention discloses a binocular three-dimensional reconstruction method and a binocular three-dimensional reconstruction system. The binocular three-dimensional reconstruction method includes acquiring certain portions of a person or an object on a turntable by the aid of two cameras; turning the turntable by a circle to obtain three-dimensional point cloud data of the scanned object and reconstructing three-dimensional curved surface models of the scanned object; driving a 3D (three-dimensional) printer to carry out printing so as to obtain three-dimensional models of the measured object. The acquired certain portions of the person or the object on the turntable are irradiated by line infrared light. The core thoughts include that the position of the to-be-measured object on the turntable is corrected by a line laser device, so that the to-be-measured object can be positioned in the center of a rotary shaft; an industrial personal computer is connected with two cameras to acquire the portions, which are irradiated by the line infrared light, of the measured object, and the turntable rotates at the constant speed by the circle under the control of the industrial personal computer; acquired images are extracted by an infrared center, and point cloud data can be generated; binocular point cloud data are fused and denoised; curved surfaces are reconstructed according to the fused point cloud data; the three-dimensional models of the measured object are printed. The binocular three-dimensional reconstruction method and the binocular three-dimensional reconstruction system have the advantages that the person or the object can be three-dimensionally reconstructed, the three-dimensional models of the person or the object can be printed, the binocular three-dimensional reconstruction method and the binocular three-dimensional reconstruction system are speedy and stable and are high in precision, and application requirements on quickly acquiring three-dimensional models of measured objects can be met.

This invention relates to a portable pushing car for checking railway, with such geometric parameter as railway gage, cant, triangle pit, including mechanical structure in I-shaped and three-point framework, electric source, induction testing, controlling and displaying sections. The bearing bogie structure, closing structure, hand button rod, measuring mechanism, controlling system, electric source, displaying box and various sense organs are mounted on main beam crossed on two-railway, three rollers and their mechanism which is both bearing and bogie. On one side of closing mechanism there is position closing wheel, on the other side there is retractable pressure resistant wheel used to make king piece and railway erect, and close to the inside of the railway. This advantages are light weight, stability, slight shaking and corrosion resistance.

The invention relates to a high frequency Coriolis mass flowmeter digital signal processing system. The high frequency Coriolis mass flowmeter digital signal processing system comprises a DSP chip, a first signal conditioning module, a second signal conditioning module, a constant flow source, a Pt100 platinum resistor, a first ADC, a second ADC, a third ADC, an analog driver module, an external expansion FLASH module, a PWM output module, a current output module, an external expansion UART module, an HART modulation module, a man-machine interface module, a power down protection module and software. For signal processing of a high frequency Coriolis mass flow sensor, a TMS320C6726 chip with the strong operational capability and the high processing speed is used as a core processor, and the high frequency Coriolis mass flowmeter digital signal processing system is invented. Based on the zero-cross detection algorithm and DTFT algorithm, the high frequency Coriolis mass flowmeter digital signal processing system solves the problem that the algorithm cannot guarantee real-time performance after sampling frequency of high frequency sensor signals is increased.

The invention provides a catenary geometrical parameter dynamic detection method based on triangulation, and the method is applied to a vehicle-mounted pantograph catenary dynamic monitoring system or a hand-push type catenary patrol detection vehicle. The method comprises the following steps: 1) obtaining pixel coordinates (xPixel, yPixel) of a catenary in an image and angle change (xAngle, yAngle) of a detection device; 2) carrying out data processing: dividing the whole test range into N sections, and carrying out calibration on each section to enable each section to form a group of camera calibration parameters, judging and obtaining the calibration height section of each pixel coordinate according to the pixel coordinates obtained in the step 1), and obtaining stagger value and height value according to the camera calibration parameters of the height section; 3) carrying out data correction: through correction conversion, obtaining actual stagger value and height value of the catenary; and 4) carrying out slope calculation. The method, based on the triangulation principle, can effectively detect the height, stagger value, distance between two lines and slope of the catenary, thereby ensuring measurement accuracy in the whole range, and eliminating large-range error.

The invention relates to a three dimensional laser scanning-GPS-combined side slope monitoring method. The monitoring method is characterized in that a three dimensional laser scanner system and a GPS monitoring positioning system are combined and are used for accurate monitoring of side slope geologic hazard. The method can accurately detect and forecast mine side slope geologic hazard, improve side slope monitoring intelligence and prediction effects, realize real-time monitoring of side slope deformation, accurate prediction of side slope deformation trend and precaution of geologic hazards such as side slope displacement and falling and guarantee mine production safety.

The invention discloses a capacitive equipment medium loss online monitoring method based on an IEC61850-9-2 sampling standard in an intelligent substation. According to the invention, medium loss measurement based on the IEC61850-9-2 sampling standard in the intelligent substation can be realized. Through fiber B code timing, synchronization acquisition of a reference voltage and a leakage current can be realized. Through a high-precision zero-flux mutual inductor and a 16 bit AD, the acquisition of the leakage current can be realized. Through a resampling algorithm and a software frequency tracking algorithm, rejection of an interference signal and full period sampling can be realized. And high-precision online monitoring of the capacitive equipment medium loss can be realized. By using the method of the invention, a medium loss measurement problem based on the digital sampling in the intelligent substation can be solved.

The invention discloses a method for detecting the mobile phone case profile degree defects. The method comprises the following steps of putting an intelligent mobile phone case (5) to be tested onto a test platform in the front center position of a test system structure element (4); a first CMOS image pickup module (2) and a second CMOS image pickup module (3) are arranged at the two ends of the test system structure element (4). The concrete method comprises the following steps of 1, putting the mobile phone case onto the test platform; using a semiconductor line structure optical laser with the blue wavelength being 405nm for illuminating the mobile phone structure element; respectively collecting laser line images by the first and second CMOS image pickup modules; obtaining the upper surface 3D point cloud data; selecting the camera optic axis and laser line optical plane included angle to be 45 degrees; 2, setting the sensor sampling line number being n pixels; determining the sampling pixel line numbers and the like of the sensor according to the depth measurement range.

The invention discloses a voltage stabilization online monitoring phasor data measurement device and a voltage stabilization online monitoring phasor measurement method. The device comprises a synchronous clock unit, an acquisition unit, an input unit, a dual-port random access memory (RAM) transmission module, a data management unit and an output unit. A precise global positioning system (GPS) synchronous clock signal serves as a reference of a sampling process, so that phasors of each sampling channel are in a determined and uniformed phase relationship; a digital signal processor (DSP) is used for data acquisition and phasor calculation; an embedded real-time operating system and graphical user interface-based ARM9 takes charge of data management and communication, has the characteristics that the processing capacity is high, the real-time is high, the ARM9 is easy to upgrade and the like and improves the reliability, the network communication capacity and the expandability of the measurement device; tripping and closing are executed accurately and reliably according to an upper computer command; the DSP adopts an alpha-beta coordinate system-based phasor measurement algorithm,has the advantages of high computing speed, high suitability and high accuracy, and can accurately compute the information of a voltage/current signal phasor of a power grid; therefore, the problem of spectrum leakage when a signal frequency fluctuates greatly is avoided effectively, and the measurement precision of a non-power frequency input situation and a dynamic process is ensured.

The invention relates to a high dynamic range laser far-field focal spot measurement device and method. The high dynamic range laser far-field focal spot measurement device comprises a laser beam shrinkage or expander system, an attenuation wedge plate, a spectroscope, a scientific grade CCD (Charge Coupled Device) detector, a micro lens array, a CCD detector and a control computer; the laser beam shrinkage or expander system, the attenuation wedge plate and the spectroscope are arranged on the same light path in turn; the light incident to the spectroscope is divided into the transmission light and the reflected light through the spectroscope; the scientific grade CCD detector is arranged on a light path of the reflected light after the reflected light passes through the spectroscope; the micro lens array and the CCD detector are arranged on a light path of the refracted light in turn after the refracted light passes through the spectroscope; the scientific grade CCD detector and the CCD detector are connected with the control computer. According to the high dynamic range laser far-field focal spot measurement device and method, the dynamic measurement on high dynamic range laser far-field focal spots can be achieved and the measurement accuracy can be well ensured.

The invention discloses a Czochralski single crystal silicon diameter measurement method, which comprises the following steps of: synchronously acquiring single crystal growth images by using a camera, performing pre-processing and edge detection on the acquired images of each frame, performing sub-pixel optimal approximation and fit of a circle on the images of each frame by adopting a midpoint Bresenham circle drawing algorithm, and performing mean filter on the basis of a fit arc to acquire the accurate diameter of single crystal. The method can perform the sub-pixel optimal approximation of the circle by adopting the midpoint Bresenham circle drawing algorithm and can accurately calculate the diameter of the single crystal by using the common analog industrial camera so as to achieve the measurement effect of the high-resolution industrial camera.

The invention discloses a depth aperture internal diameter measurement device, comprising a tapered block, a sleeve, three measurement rods, a spring, a push rod, a sleeve rod, a thread sleeve rod, a three-claw chuck and an internal diameter dial indicator. The conical surface of the tapered block is uniformly provided with three sliding grooves which are formed along the generatrix direction of the tapered block; the included angle between each sliding groove and the axis of the tapered block is 45 degree; the wall of the sleeve is provided with three through holes which are uniformly distributed along the circumference; three measurement rods pass through the through hole in the wall of the sleeve; and one end of the measurement rod is clamped inside a sliding groove. In the invention, the included angle between the sliding groove and the axis of the tapered block is 45 degrees and the displacement of the measurement rod along the radial direction is turned into an axial direction, which avoids the intermediate transfer between the levers in the traditional measurement, has more accurate measurement and can measure the maximum and minimum diameter of any cross section.