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483results about How to "Avoid errors" patented technology

Detection device of subsurface defect of optical element and method thereof

InactiveCN101819163AAvoid strict requirements for strict correspondenceAvoid errorsOptically investigating flaws/contaminationLevel measurementData processing
The invention provides a detection device of subsurface defect of an optical element with little measurement error and a method thereof. The detection device of the subsurface defect of the optical element comprises a microscope, a precise displacement platform and an image data processing unit connected with the microscope, wherein thethe image data processing unit is further connected with a laser displacement sensor which is used for measuring the movement amount of the precise displacement platform in the direction Z. In the invention, the optical microscope and the laser displacement sensor are adopted for measuring the subsurface detect, the subsurface defect depth and the appearances of the subsurface detect under different depths are obtained, and the observation of the appearances of the subsurface detect under different depths and the accurate depth measurement are realized, error resulting from the reposition of the traditional detection is avoided, and micron-level measurement precision is ensured. The invention is used for the detection of the subsurface defect of optical glass, and is suitable for the measurement of processing subsurface defect of ceramic, silicon, germanium and other engineering materials.
Owner:成都精密光学工程研究中心

Method and system for automatically acquiring complete three-dimensional data of object surface

The invention is applicable to the technical field of three-dimensional measurement, and provides a method and a system for automatically acquiring complete three-dimensional data of an object surface. According to the system, a plurality of three-dimensional sensors are arranged along the one-dimensional direction for acquiring the three-dimensional depth data of the object surface; a tested object is placed on a transparent platform; and the transparent platform can drive the tested object to rotate, so that the sensors measure the bottom surface data of the object. According to the method and the system, high-accuracy calibration of a multi-sensor array without visual field overlapping is realized; automatic matching of a plurality of angle depth images is finished using calibration information by adopting a rotation angle presetting method according to the characteristic of high repeated rotation accuracy of a rotary table, so that the error caused by uncertainty of a rotating shaft is avoided and the rotating shaft is not required to be calibrated; and since the transparent platform is utilized, system can measure the bottom surface data of the object and can finally obtain the complete three-dimensional data of the surface of the tested object. In addition, the system can be used for measuring the instep of a human body.
Owner:SHENZHEN ESUN DISPLAY

Method for positioning faults of power distribution network based on amplitude analysis of three-phase current

The invention relates to a method for positioning faults of a power distribution network based on the amplitude analysis of a three-phase current. The method comprises the steps of collecting the three-phase current of the power distribution network in real time, carrying out amplitude analysis on phase current of each phase before and after a single-phase earth fault once the single-phase earth fault occurs, carrying out deviation calculation by collecting phase currents with the same phase position at a starting moment so as to realize the amplitude calculation of a current phasor, simultaneously filtering the influences of load currents and interphase capacitance currents, and calculating a valid value of the change of each phase current. A monitoring device mounted at a certain point of a circuit can detect whether a detection point is located at a fault route by analyzing the change amount of the amplitude of the three-phase current. Based on the amplitude characteristics of the three-phase current after the single-phase earth fault occurs, a zero sequence current does not need to be synthesized, so that the analytical calculation quantity of a main station is reduced; and the method has relatively high practical values in the engineering.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)

Wool fineness automatic measuring method

The invention discloses a wool fineness automatic measuring method, which comprises the following steps that instruments required for automatically measuring the wool fineness are prepared, and the instruments comprise an LED (light emitting diode) light source, a testing sample XY work table, an optical magnification system and a digital camera; light rays are irradiated to testing samples by the LED light source; through the optical magnification system, sample images are captured by a CCD (charge coupled device) camera; the sample images are sent to a computer processing system for measurement and calculation. The wool fineness automatic measuring method provided by the invention has the advantages that the manual intervention is not needed, manpower resources are reduced, and errors caused by subjective factors are avoided; simple and efficient processing links are adopted, the consumed time of the whole wool fineness automatic measuring process is shortened to be within 30ms, the original wool state is maintained to the maximum degree, and the damage to the geometric dimension of wool is avoided, so the basis is provided for guaranteeing measurement precision; during the diameter calculation, the condition that the wool edge is basically in a straight line state or an approximate straight line state is used as the basis for approximately solving the diameter by adopting an area method, so the measurement precision cannot be greatly influenced.
Owner:AIR FORCE UNIV PLA

Vacuum plume aerodynamic force measuring system and method

The invention discloses a vacuum plume aerodynamic force measuring system and method. The vacuum plume aerodynamic force measuring system comprises a vacuum chamber, an engine, a force measuring model, a plume protection cover, a displacement mechanism, a mounting base and a six-component balance force measuring system. According to the vacuum plume aerodynamic force measuring system and method, a small-range six-component balance is used as a force measuring element for directly measuring vacuum plume aerodynamic force, so that a measurement result is more accurate; according to the characteristics of high speed and high temperature of engine vacuum plumes, duralumin is used as a material for designing the force measuring model and the plume protection cover, so that the force measuring model and the six-component balance are prevented from being damaged; the displacement mechanism is used for driving the six-component balance and the force measuring model to scan a plume field, and aerodynamic force measurement can be conducted at multiple positions under multiple working conditions in one close-cabin experiment. The vacuum plume aerodynamic force measuring method comprises the following steps that the six-component balance is calibrated, a six-component balance working formula is calculated, experimental equipment is installed, the experiment is conducted, and data are processed.
Owner:BEIHANG UNIV

Micro-CT (micro-computed tomography) based non-uniform Voxel grid discretization method for three-dimensional braided composite material

ActiveCN106202728AAvoid errorsSmall scaleImage enhancementImage analysisMicro computed tomographyGray level
The invention provides a Micro-CT (micro-computed tomography) based non-uniform Voxel grid discretization method for a three-dimensional braided composite material, relates to a non-uniform Voxel grid discretization method, and aims to solve the problems of mesostructure in-situ modeling and relatively difficult grid discretization of the three-dimensional braided composite material. The method comprises steps as follows: step one, binary images of gray-level sheet images are obtained; step two, a cross section shape of a fiber bundle is determined; step three, local coordinate information of the fiber bundle is obtained according to a fiber bundle path; step four, a direction of local coordinates at each cross section center point of the fiber bundle along the fiber bundle path is determined; step five, a geometric model of a mesostructure of the three-dimensional braided composite material is generated; step six, Voxel grids on the boundary of the fiber bundle and the boundary of a matrix are obtained; step seven, whether the new Voxel grids belong to the fiber bundle or the matrix is defined; step eight, the new Voxel grids are discretized into non-uniform Voxel grids. The method is applied to the field of finite element modeling of the three-dimensional braided composite material with a complicated braided structure.
Owner:HARBIN INST OF TECH

Splicing seam brightness compensation and adjustment method for high-density LED display screen

The invention relates to a splicing seam brightness compensation and adjustment method for a high-density LED display screen. The method comprises the following steps: conducting point-by-point consistency correction to obtain the first-correction color space conversion parameter matrixes of pixels; partitioning the pixels in a splicing seam area into a plurality of correction units; driving the correction units and benchmark units in modules to conduct display via real-time drive display data obtained after the first correction; conducting brightness consistency correction on the correction units by taking the brightness of the benchmark units as a benchmark to obtain the second-correction color space conversion parameter matrixes of the pixels in the correction units; and taking the Hadamard product of the first-correction color space conversion parameter matrix and the second-correction color space conversion parameter matrix of each pixel as the final color space conversion parameter matrix of the pixel, thus obtaining the final color space conversion parameter matrixes of the pixels in the correction units. The method provided by the invention can weaken the phenomena of uneven bright lines and dark lines caused by splicing seams among LED display modules, and improve the display effect of the display screen.
Owner:CHANGCHUN CEDAR ELECTRONICS TECH CO LTD

Self-verification automatic test system, device and method for on-resistance

InactiveCN102981056ASolving inefficienciesAvoid errorsResistance/reactance/impedenceWire resistanceProgram control
The invention discloses a self-verification automatic test system, a device and a method for on-resistance. The system comprises program-controlled multi-channel selectors, a connecting cable, a self-verification component, a digital multimeter and a control module, wherein the program-controlled multi-channel selectors are used for controlling opening or closing of channels by turning on or off a switch; the connecting cable comprises an A end, a B end and a C end; the self-verification component is used for verifying the on-resistance of a tooling; the digital multimeter is used for sending a measured value of the on-resistance of the tooling and a measured value of the on-resistance of tested equipment to the control module; the digital multimeter is set in a four-wire resistance measurement mode by the control module; the control module controls the program-controlled multi-channel selectors to change the channels, starts testing the on-resistance of the tooling and receives the measured value of the on-resistance of the tooling sent by the digital multimeter; the control module controls the program-controlled multi-channel selectors to change the channels, starts testing the on-resistance of the tested equipment, and receives the measured value of the on-resistance of the tested equipment sent by the digital multimeter; and finally a true value of the on-resistance of the tested equipment is obtained.
Owner:BEIJING AEROSPACE MEASUREMENT & CONTROL TECH

Engineering machine operation target positioning method and system

The invention discloses an engineering machine operation target positioning method and system. The method comprises the following steps: (1) a reference station collects the satellite positioning information in real time as the current measured value D0, and then sends the D0 to a first moving station and a second moving station; (2) the first moving station and the second moving station individually collects the satellite positioning information in real time as the current measured value D1 and D2, and then a realtime dynamic differential treatment is carried out on between D0 and D1 and between D0 and D2 respectively so as to obtain the relative coordinate information of the first moving station and the second moving station; (3) a crane calculation unit determines the extend length, pitch angle, and rotation angle of a lifting arm according to the relative coordinate information of the first moving station and the second moving station; (4) finally the crane controls the lifting arm to move to the lifting position of an object to be lifted and lift the object according to the calculated extend length, pitch angle, and rotation angle of the lifting arm. The provided method and system can largely improve the precision of positioning on operation target, moreover the lifting arm is automatically traced, and the error and risk brought by eyeballing are avoided.
Owner:XUZHOU HEAVY MASCH CO LTD

Computer pattern recognition technology for microstructure of composite material and three-dimensional modeling method

The invention discloses a computer pattern recognition technology for a microstructure of a composite material and a three-dimensional modeling method which are used for solving a problem that material components are difficult to be recognized and unstable in the prior art. The computer pattern recognition technology comprises the steps of acquiring a digital image of the internal structure of a 2.5D composite material by using an XCT technology; recognizing an independent base body portion by adopting a threshold segmentation method, and performing de-noising; respectively the left and the right of the independent base body region; pairing left and right base bodies by using the bilateral symmetry of the base bodies; for each group of paired base bodies, selecting appropriate upper and lower boundary points of the base bodies, and performing upper and lower boundary fitting, wherein an area between the upper and lower adjacent base bodies is a warp yarn area, and an area between the left and right paired base bodies with the base bodies being removed is a weft yarn area. The method disclosed by the invention can avoid manual intervention, and save a lot of manpower and time. Meanwhile, the invention further can build a three-dimensional model of the microstructure of the composite material so as to be used for further research and analysis.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Calibrating method for CCD (Charge Coupled Device) imaging lateral laser radar

The invention discloses a calibrating method for a CCD (Charge Coupled Device) imaging lateral laser radar. The method comprises the following steps of: enabling an optical axis (1) of a CCD camera to be vertical to the plane of a calibration table (2), firstly acquiring a CCD image of the calibration table (2) by use of the CCD camera (3), and then calculating the offset angle (alpha) and angle width (d alpha) of each pixel according to a table number in the CCD image of the calibration table (2) and a pixel number with a same dimension as the table number increment in the table; and after placing the CCD camera (3) at the lateral adjacent part of an emitted light beam (5) of the laser radar, firstly determining the vertical distance(D) between the CCD camera (3) and the emitted light beam (5) of the laser radar by adopting a three-point positioning method, then substituting the offset angle (alpha) and angle width (d alpha) of each pixel as well as the vertical distance (D) between the CCD camera (3) and the emitted light beam (5) of the laser radar into a lateral laser radar equation P(alpha)=P0KA/D *TtTrbeta(alpha)dalpha, and performing inversion calculation by use of the offset angles (alpha), the angle widths (d alpha) and the vertical distance (D) so as to obtain atmospheric parameters. The calibrating method disclosed by the invention is high in measurement accuracy and wide in application range, and can be widely used for measuring the spatial distribution of atmospheric aerosol of a surface layer.
Owner:中国人民解放军陆军军官学院

Compressor preheating control method and system, storage medium and air conditioner outdoor unit

The invention discloses a compressor preheating control method and system, a storage medium and an air conditioner outdoor unit. The compressor preheating control method comprises the steps that the current environment temperature is detected, and whether the current environment temperature is lower than preset heating temperature or not is judged; when the current environment temperature is lowerthan the preset heating temperature, a winding resistance value of a current compressor is detected; the winding temperature of the current compressor is calculated according to the winding resistance value of the current compressor, preset standard temperature and a delivery resistance value; and when the winding temperature of the current compressor is lower than the preset heating temperature,heating currents are output to a compressor winding, the winding temperature of the current compressor continues to be calculated, and the heating currents stop being output till the winding temperature of the compressor is higher than target temperature. According to the compressor preheating control method, whether preheating needs to be conducted or not is judged by directly detecting the winding temperature in the compressor, therefore, monitoring errors of the external temperature are avoided, and more effective and more accurate compressor preheating control is achieved.
Owner:TCL AIR CONDITIONER ZHONGSHAN CO LTD
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