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5315results about How to "Realize measurement" patented technology

Optical fibre grating three-dimensional acceleration /vibration sensor

A 3D acceleration / vibration sensor for fiber grating comprises three measurement probes respectively fixedly arranged on a right plane, an upper plane and a front plane of a pedestal vertical to each other and corresponding to x, y and z axes to form a mutually vertical position relationship, wherein each measurement probe is connected with an optical splitter through a single-mode fiber at one end, and the other end of the optical splitter is respectively connected with a light source and wavelength demodulation equipment through a single-mold fiber. The measurement probe comprises a bending beam fixed on the pedestal plane, fiber gratings adhered on the surface of the bending beam along the axial direction of the bending beam and a mass block fixed on the free end of the bending beam, wherein one ends of the fiber gratings are connected with the optical splitter through a single-mold fiber. The invention adopts a fiber Bragg grating as the sensor, and adopts three fiber gratings for measuring three mutually vertical components of a spatial 3D acceleration, thus achieving measurement of the spatial 3D acceleration by vector superposition of the three components. The sensor can be used for sensing spatial 3D acceleration or vibration parameters.
Owner:NANKAI UNIV

Three-dimensional gait information collection and analysis method based on Kinect motion-sensing technology

Provided is a three-dimensional gait information collection and analysis method based on Kinect motion-sensing technology. The method includes the steps of utilizing a running machine, a Kinect sensor, a Kinect supporting cloud platform and a computer to constitute a gait data collection hardware system, choosing a speed level of the running machine for a person to walk on the running machine; using the Kinect sensor to identify nodes of a human skeleton, and adopting threshold filtering and double-exponential filtering to stabilize data about the skeleton nodes, then building a local coordinate system according to human anatomy and calculating an anatomy movement curve; using a catch method for a gait event to identify the gait event, finishing calculation of gait parameters according to the gait skeleton data, and finally displaying the gait parameters and a gait motion curve on the interface. The three-dimensional gait information collection and analysis method based on the Kinect motion-sensing technology has the advantages of low production costs, no use of gauge points for catching three-dimensional skeleton nodes, remote collection, an ability of automatically catching a gait event, precise calculation of gait parameters and tracks, simple operation and the like.
Owner:XI AN JIAOTONG UNIV

Pinpoint enhanced dark-field microscope, electrochemical testing device and leveling system

The invention provides a pinpoint enhanced dark-field microscope, an electrochemical testing device and a leveling system. The pinpoint enhanced dark-field microscope is characterized by using an optical fiber probe, wherein metal nanometer particles for decoration are arranged at the pinpoint of the optical fiber probe, incident lights are transmitted inside the optical fiber probe which is provided with the metal nanometer particles for decoration, and the distance between the pinpoint and a sample adopts a light intensity control mode; and the pinpoint enhanced dark-field microscope is a localized surface plasmon resonance dark-field coupling device which utilizes the near-field coupling function of the nanometer metal particles at the pinpoint of the probe and a metal substrate material. The microscope can be used for researching basic surface and interface chemical problems such as a double-electric-layer structure of a substrate surface, adsorption/desorption behaviors and multi-phase catalysis. In addition, based on the LSPR (Localized Surface Plasmon Resonance) distance sensitiveness principle, the pinpoint enhanced dark-field microscope can be applied to a three-probe horizontal sensor to perform self-adaptive leveling on a nanometer processing platform.
Owner:XIAMEN UNIV

Space division multiplexing Mach-Zehnder cascade type optical fiber interferometer and measurement method thereof

The invention provides a space division multiplexing Mach-Zehnder cascade fiber interferometer and a measurement method thereof. The space division multiplexing Mach-Zehnder cascade fiber interferometer is composed of a wide-spectrum light source, a photodetector, a coupler, a single-mode connection optical fiber, an optical fiber sensor, a continuous-variable optical delay device, and a reflector, wherein the optical fiber sensor is composed of a Mach-Zehnder interferometer and forms a cascade optical fiber sensor array or a network. The wide-spectrum light source and a photodetector are connected with the optical fiber sensor through the coupler to form a sensor network; and the sensor network is connected with the continuous-variable optical delay device and the reflector through the coupler and is used for enquiring and demodulating the optical fiber sensor. The space division multiplexing Mach-Zehnder cascade fiber interferometer solves the problem of breakage of the optical fiber sensor array, improves the anti-damage characteristics of the optical fiber sensor array and the network and solves the temperature compensation problem in the measurement process. The space division multiplexing Mach-Zehnder cascade fiber interferometer has the advantages of simple interferometer structure, easy implementation, improved measurement reliability and low cost, and better facilitates the technology generalization and popularization.
Owner:HARBIN ENG UNIV

Device for testing powder combustion characteristics in vacuum condition

The invention discloses a testing device of gunpowder combustion characteristics in vacuum, which mainly comprises a combustion chamber, a vacuum pump, an electric heater, a thermoelectric couple, a high speed camera and a data acquisition and processing system; wherein, the vacuum pump provides vacuum environment for the combustion chamber; by controlling the heating current and the heating time of the electric heater, different ignition isoperibols can be provided for tested gunpowder samples in the combustion chamber; and the data acquisition and processing system collects the test data generated by the thermoelectric couple and the gunpowder combustion images shot by the high speed camera when the tested gunpowder samples combust, and finally obtains the combustion characteristics of the tested gunpowder samples through corresponding processing and calculation. The invention not only can be used for testing the parameters such as combustion speed, combustion surface temperature and combustion heat and the like of the gunpowder in vacuum, but also can be used for the generation and collection of the combustion products of the gunpowder under different vacuum conditions. The invention has the overriding advantages of high integration level, obtaining various parameters by one testing and low testing expenses.
Owner:XIAN MODERN CHEM RES INST

Method and device for measuring appearance and wall thickness of sphere by combining differential confocal and point-diffraction interference

The invention belongs to the field of optical precision measurement and relates to a method and a device for measuring the appearance and the wall thickness of a sphere by combining a differential confocal confocal technology and point-diffraction interference. The method realizes the high-precision rapid measurement on the appearance of the outer surface of the sphere by using the point-diffraction interference, the rotation of the measured sphere and the splice of a measuring sub-aperture; and the appearance and wall thickness of the inner surface and the outer surface of a key area of a transparent or semitransparent sphere can be scanned and measured point by point by using the differentia confocal technology. The invention organically integrates a point-diffraction interference technology and the differentia confocal technology so as to realize the synchronous measurement on the appearance and the wall thickness of the inner surface and the outer surface of the sphere, and aims to solve the difficult problems that the traditional AFM or a single confocal sensor and the other scanning methods have low measuring speed, low efficiency, easy leakage in measurement and the like during measuring the surface of the sphere. The invention has broad application prospect in the fields of testing the appearance and the wall thickness of a laser fusion pellet, the appearance and the outline of a spherical surface and the like.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Method and device for measuring condition of channel between D2D (device-to-device) user equipment

InactiveCN103702346ARealize measurementEfficient Resource SchedulingWireless communicationUser equipmentDevice to device
The invention discloses a method for measuring the condition of a channel between D2D (device-to-device) user equipment. As for a network side, the method comprises the following steps: the network side indicates measurement-related configuration information of transmitting terminal user equipment for measuring terminal user equipment in D2D communication, and the measurement-related configuration information of the transmitting terminal user equipment is configuration information configured by the network side for the transmitting terminal user equipment and used for measuring the channel, and comprises configuration information for measuring the channel of a honeycomb cell and/or configuration information used for measuring the D2D channel. The invention further discloses a device for measuring the condition of the channel between the D2D (device-to-device) user equipment, and when the equipment is a network side entity, the network side entity is used for indicating the measurement-related configuration information of the transmitting terminal user equipment for the measuring terminal user equipment in D2D communication. With the adoption of the method and device provided by the invention, the condition of the channel between the D2D user equipment can be measured.
Owner:ZTE CORP

Image spectrum detection method and system

The invention discloses an image spectrum detection method and system. The system comprises an imaging lens set, a DMD, imaging lenses, an area array CCD camera, a convergent lens set, an optical fiber coupler, an optical fiber, a fiber optical spectrometer and a processor. Both the CCD camera and the fiber optical spectrometer are connected to the processor. A micromirror in a micromirror device has the opening state and the closed state. Incident image signals transmit the imaging lens set to form incident light signals and then enter the micromirror device. When the micromirror in the micromirror device is in the closed state, reflecting light signals are imaged to the surface of the CCD camera through the imaging lenses; when the micromirror in the micromirror device is in the opening state, the light signals are reflected to the convergent lens set, converged to the optical fiber coupler, coupled to the optical fiber, and transmitted to the fiber optical spectrometer for spectrum measurement. The image spectrum detection system can be provided with any fiber optical spectrometer, broadband spectrum measurement is achieved, and the spectral resolution can be increased to 0.0001 order of magnitude through the image spectrum detection system according to the technical parameters of an existing commercial fiber optical spectrometer.
Owner:SUN YAT SEN UNIV

Phase grade self-coding-based optical three-dimensional measurement method

InactiveCN102322823AGet the absolute phase distributionRealize measurementUsing optical meansThree dimensional measurementFace shape
The invention discloses a phase grade self-coding-based optical three-dimensional measurement method. In the traditional phase measurement technology, generally additional coding patterns need to be projected to realize three-dimensional profile measurement of an isolated object. The method comprises the following steps of: providing sinusoidal stripes, the digital projection of which has phase grade coding information; constructing a code sequence, the total length of which is equal to the projected stripe period sum, by using the differential value or the slope value of phase distribution as a coding channel and using each stripe period as a coding unit; constructing a code sub sequence by using a plurality of adjacent periods; searching the position of the code sub sequence in the total code sequence to determine the phase grade of the period so as to obtain absolute phase distribution of the object to be measured; and finally, reconstructing a three-dimensional profile of the object to be measured according to the phase height relationship. The method can complete three-dimensional information acquisition of the object without projecting the additional coding patterns, and is particularly suitable for quick three-dimensional profile measurement of the isolated object.
Owner:SICHUAN UNIV

Non-refrigerant thermopile infrared detector and manufacturing method thereof

The invention relates to a non-refrigerant thermopile infrared detector and a manufacturing method thereof. The invention is characterized in that a micro heater is arranged in the infrared absorption area of a non-refrigerant thermopile infrared detector. Because the manufacturing process of the micro heater is completely compatible with that of the thermopile, the two processes are integrated on one chip. By using the micro heater to measure the thermal conduction of the encapsulated infrared detector, the invention realizes the measurement of the vacuum degree of an encapsulated device; and by using the micro heater to simulate the operation state of the thermopile infrared detector, the invention realizes the wafer level self-test of the infrared performance of the detector. The invention can be used for mass production, can monitor the key process step of wafer level bonding and vacuum encapsulation, and can realize the wafer level measurement of the infrared performance of the detector. Besides, the invention improves the device-testing efficiency, reduces the testing cost, and can realize a low-cost and high-performance non-refrigerant thermopile infrared detector.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI

Five-shaft image measurement device used for measuring film hole shape and position parameters

The present invention relates to a five-shaft image measurement device used for measuring the film hole shape and position parameters. The five-shaft image measurement device can be used to obtain theshape and position parameters, such as the apertures of the film hole characteristics on a hollow turbine blade in an aero-engine, the axis space angle, the hole central coordinates, etc. thereby really describing the actual state of each film hole, and comprehensively evaluating the processing quality of each film hole. The five-shaft image measurement device of the present invention is based onthe machine vision measurement principle, adopts an illumination mode of combining the backward illumination and the forward illumination, changes the space position and attitude between the measuredhollow turbine blade and an image acquisition device via the linkage of three linear shafts and two rotating shafts, and determines the alignment accuracy of the image acquisition device and the measured film holes based on the shape characteristics of the acquired film hole images. The five-shaft image measurement device of the present invention is compact in structure and high in measurement precision, is convenient to use, and can measure automatically, thereby providing the technical means of detecting the processing quality of the film holes with high precision, high efficiency and highreliability. The five-shaft image measurement device also can be used as a universal five-shaft image measurement device.
Owner:CHINA PRECISION ENG INST FOR AIRCRAFT IND AVIC

Detection method and laser radar of Raman-Mie scattering laser atmospheric signal

This invention is a detecting of Roman-Mie dispersion laser atmosphere signal and laser radar. It sets up the radar with the output of double-frequency 532nm and triple-frequency 355nm, launches the 532nm, 15% of the 35nm to the sky and 85% of the 355nm after diffusion, and the two optical paths parallel with the optical path of the receiving telescope, and simultaneously carry out the pitching motion with the receiving telescope; the receiving telescope backward dispersing light, the backward light gets into the telescope, then passes the glare tube, the adjusting field view stop and ocular glass, and the dichroic mirror process, and divides the 407nm, the 386nm and the 532nm scattered light into three beams, and the 532nm scattered light is divided into 15% and 85% beams, and the four beams are respectively received by the multiplier phototube, magnified by the magnifier and collect and process the data. It can detect the level visibility of the atmosphere, the aerosol of the whole troposphere and the vertical outline of winding cloud light eliminating system and the water and air mixture ratio from the ground to the lower part of the troposphere. The detecting error of the level visibility is 15%, the errors of the aerosol light eliminating modulus and the vertical outline of the water and air mixture are 20%.
Owner:ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI

Combination measuring instrument of optical fiber Mach-Zehnder and Michelson interferometer array

InactiveCN101329184ASolving Multiplexing ProblemsRealize inquiryCoupling light guidesConverting sensor output opticallyMeasuring instrumentMultiple sensor
The invention provides a measuring instrument with an optical fiber Mach-Zehnder interferometer and optical fiber Michdson interferometer arrays, which comprises a broad-band light source 1, a photoelectric detector 2, a 3dB optical fiber 2 multiplied by 2 coupler 3, the optical fiber Mach-Zehnder interferometer, a transposed 3dB optical fiber 2 multiplied by 2 coupler 7, optical fiber Michdson interferometers arrays 8 and 8', and a single-mode connecting optical fiber 9, wherein, the optical fiber Mach-Zehnder interferometer consists of an attenuator 4, a self-focusing lens 5, an axicon lens 6 with total reflection angle, and the connecting optical fiber 9. The measuring instrument with the optical fiber Mach-Zehnder interferometer and the optical fiber Michdson interferometer arrays utilizes a technique that measures strain and temperature at the same time, realizes the temperature compensation technique and the array arrangement of optical fiber sensors, realizes absolute measurement under the situation that the multiple sensors are not interfered by each other, lowers the cost of single-point measurement and ensures real-time measurement; furthermore, the measuring instrument has simple techniques and easy implementation, and as standard optical fiber communication elements are adopted as the optical fiber materials and devices, the measuring instrument has low cost, easy acquisition of the optical fiber materials and devices and easy popularization.
Owner:HARBIN ENG UNIV

Integral permeability testing machine for self circulation measuring for perpendicular and horizontal permeability coefficient

The invention discloses a comprehensive permeability testing machine for measuring vertical permeability coefficient and horizontal permeability coefficient. The invention comprises a constant-pressure water tank which is communicated with two water supply pipes, wherein, one water supply pipe is communicated with an upper pressure chamber; the top of the upper pressure chamber is provided with a barometer and an air-bleed hole and the side face of the upper pressure chamber is provided with an inflating device; the upper pressure chamber is communicated with a lower pressure chamber through an assembly member; the upper part of the lower pressure chamber is provided with a bubble exhaust hole and the lower part of the lower pressure chamber is communicated with a graduated flask through an exhaust pipe and a metered valve; the other water supply pipe is connected to the left of the assembly member; and the assembly member is communicated with the graduated flask through the exhaust pipe and the metered valve and consists of an impervious membrane, silicon rubber, a V-shaped slot board and a pressurized plastic membrane. The comprehensive permeability testing machine has the advantages that: firstly, the pressurized plastic membrane can quickly, precisely and uniformly transfer normal pressure to a sample, and the impervious membrane can prevent leakage of the sidewall; secondly, water flow is uniformly infiltrated into the V-shaped slot; thirdly, due to arrangement of the silicon rubber, the border effect is reduced; fourthly, the whole machine realizes measurement of the vertical permeability coefficient and the horizontal permeability coefficient, and is precise, simple and clean, highly efficient, practical and convenient to operate.
Owner:ZHEJIANG UNIV
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