84results about How to "High speed measurement" patented technology

The invention discloses a three-dimensional human body gait quantitative analysis system and method. The method comprises the following steps of: simultaneously using two inertia measurement nodes on feet, carrying out analyses fusion on the data of the two inertia measurement nodes, measuring a more accurate gait parameter, and obtaining information which can not be measured in a single-foot manner; and firstly storing the collected data in storage units of the measurement nodes in a walking process, and finally transmitting the collected data to an analytical calculation device in a wired or wireless manner after the walking process is ended. The high-speed acquisition of all gait information in the walking process can be realized and no characteristic gait information point is omitted. A foot part binding device of the designed inertia measurement node is adopted, a measuring error brought by fixed position shift of the measurement nodes in the walking process is eliminated, and the identity of fixed positions of the measurement nodes in a walking process is guaranteed through repeated measurement; and a gait analytical calculation program module adopts a moving window searching value method to definition a characteristic point of gait information, and can more exactly extract the gait diagnostic information.

The invention relates to an image collecting circuit of a high-speed absolute grating ruler. Coarse code channels and high-precision absolute code channels are engraved in the grating ruler. A photoelectricity converter for reading images and two LED light sources are further installed on the grating ruler. Multiple data reading windows are arranged in the photoelectricity converter. The image collecting circuit comprises a circuit switching device, a first A / D converter, a second A / D converter, a phase detector, a first position detector, a counting device, a second position detector, a speed detector, a correcting processor, a phase correcting processor, an absolute position detector, a speed judging device, a coding and decoding device and a storage device. Phases output by the photoelectricity converter are used for finely dividing adjacent absolute coding engraving line intervals to improve measuring precision of the grating ruler, macro-micro composite reading on low-precision incremental code channels and high-precision absolute code channels is achieved with a reading head. In a low-precision measuring stage, high measuring speed is achieved and low-speed high-precision measuring is carried out by switching when an endpoint is close.

The invention relates to the field of three-dimensional imaging lidars, and aims to overcome the deficiencies of the prior art and provide an implementation method for a sparse array high-speed three-dimensional imaging lidar. In the implementation method, convenient and easily-obtained single detectors are utilized to form a sparse array detection system through sparse arrangement, piezoceramic low-angle quick scanning is combined to realize quick photoelectric conversion in a target echo signal subzone and solve the problems in high-speed three-dimensional imaging of the lidar. The invention is characterized in that an imaging detection optical system comprises a piezoceramic two-dimensional vibrating mirror (3), a laser receiving system (4) and the sparse array detection system (5). The invention has the advantages as follows: motor-free rotational scanning is realized, the whole structure is simple and the reliability is improved; the array detection has high imaging frame frequency and can satisfy high-speed measurement; devices are easy to obtain; and the transmit-receive separation layout has a low requirement for emitted light, and the installation is convenient.

The invention relates to a high-speed three-dimensional surface shape vertical measurement method adopting a projection single-frame structured light image. The high-speed three-dimensional surface shape vertical measurement method is characterized in that a special combined projection lens comprises an ordinary projection lens and a cylindrical lens and is adopted in a structured light projection device. The combined projection lens images a 1-frame orthogonal grating image on a measured object, and an image of a horizontal stripe of an orthogonal grating is separated from an image of a vertical stripe. A CCD (Charge Coupled Device) camera synchronously acquires the orthogonal grating image subjected to object height modulation from the same direction through a semi-transparent semi-reflection mirror. The acquired image is subjected to Fourier transform, filtering and inverse Fourier transform to obtain the distribution of modulation degree of horizontal stripe components and vertical stripe components of the orthogonal grating image on the object surface. An object three-dimensional surface shape is rebuilt through a corresponding relationship between the modulation degree obtained by calibration in advance and height. The high-speed three-dimensional surface shape vertical measurement method provided by the invention can realize the object three-dimensional shape reconstruction through single-frame stripe image shooting and has the characteristic of realizing high-speed vertical measurement.

The invention relates to a spatial carrier based interference confocal measuring device and a method, belonging to the technical filed of measurement of surface topography. The measuring device comprises a laser, a collimation focusing objective lens, a pinhole, a collimation expander objective lens, a polarization beam splitter, a quarter wave plate, a beam splitter, a detection focusing objective lens, a second microdrive and a collecting objective lens, wherein the rear side of the beam splitter along the direction of a primary optical axis of the laser is sequentially provided with an auxiliary reference lens and a first microdrive, a main reference lens is arranged between the beam splitter and the detection focusing objective lens, a CCD camera is placed on a focus position of the collecting objective lens, and a master control computer is connected with the CCD camera and the first microdrive. The method comprises the steps: establishing displacement and phase relation by a secondary confocal method, introducing a carrier signal by tilting the auxiliary reference lens, obtaining a carrier interferogram, acquiring the phase information of a measured surface by a spatial carrier phase-shifting algorithm, and finally fitting surface topography and three-dimensional profile. The invention is suitable for dynamic, quick and high-precision measurement of micro-structure three-dimensional topography.

The invention provides a novel fiber bragg grating demodulation method and a system thereof based on a multi-longitudinal mode F-P laser device. The system comprises the multi-longitudinal mode F-P laser device, an optical fiber coupler, fiber bragg gratings, a DWDM (dense wavelength division multiplexing) device, a photoelectric detector, a DSP (digital signal processor) module, a central control and display unit and a power control unit which is connected with the multi-longitudinal mode F-P laser device, wherein lasers sent by the multi-longitudinal mode F-P laser device enter the fiber bragg gratings through the optical fiber coupler; signals output by the fiber bragg gratings enter the DWDM device with matched wavelengths after transmitted by optical fibers, and output optical signals are received by the photoelectric detector and converted into voltage signals; and the voltage signals are calculated and controlled by the DSP signal processing module, so that demodulation signals are acquired; and the demodulation signals are sent to the central control and display unit for judgment and operation and are provided for peripheral equipment for display through a serial port. The method and the system have the benefits as follows: the multi-longitudinal mode F-P laser device is matched with the DSP signal processing module, so that high-speed dynamic demodulation and multiplex of grating signals are realized, and the demodulation cost is reduced.

The invention discloses a vehicle anti-collision early warning system based on laser radar ranging. The vehicle anti-collision early warning system comprises 2n laser radar emitters and 2n optical lenses, wherein n is a natural number. Each laser radar emitter is paired with one optical lens to form a signal receiving and transmitting group. Each signal receiving and transmitting group is arranged along the central axis of a vehicle. An acute angle is formed between each optical lens and the vertical direction of the corresponding laser radar emitter. The laser radar emitters on one side of the central axis emit laser signals, and the laser signals are scattered after contacting with objects in places ahead and are received by the optical lenses at corresponding positions on the other side of the central axis. The vehicle anti-collision early warning system has the advantages that through intelligent anti-collision active early warning based on accurate laser radar ranging, users can get better experience effects; double-lens design is adopted, the lenses are treated specially in terms of optical design, and high-accuracy optical imaging and detecting and lens structure design applicable to complex in-vehicle environments can be guaranteed.

The invention provides a rapid non-contact measuring method of railway intrusion boundary, and specifically relates to the method of automatically measuring the distance between objects such as a railway station and the like and a gauge center and the height of the objects relative to a rail surface based on a structured light three-dimensional visual detection technology. In the method, on the basis of a principle of structured light three-dimensional visual measurement, a linear-structured laser and a camera are employed, wherein, the linear-structured laser emits a laser line which is vertical to the rail surface, the camera acquires an image illuminated by the laser line, and a microprocessor calculates the distance between the objects such as the railway station and the like and the gauge center and the height of the objects relative to the rail surface according to spatial three-dimensional relation, thus realizing non-contact, high-speed and high-precision measurement.

Line spacing values in a document image are extracted and a variance is calculated for fluctuations in the line spacing values. When the calculated variance is higher than a preset threshold value, the document image is determined as having watermark information embedded therein. Such use of the variance in the line spacing values enables high-speed determination of the presence or absence of line-spacing watermark information. At this time, it is possible to speed up the determination by using only some line spacing values in the document, instead of using all line spacing values.

The invention discloses a fiber Bragg grating vibration sensing measurement system and a use method. An upper computer is connected with a tunable laser source, an acquisition card and a signal processing circuit, wherein a synchronous triggering output port of the tunable laser source is connected with a synchronous triggering input port of the acquisition card; laser output by the laser source is connected to one laser splitting port of a coupler; a combination port of the coupler is in series connection with n fiber Bragg gratings (FBGs) which are distributed at different test positions and have different working wavelength regions; and the other laser splitting port of the coupler is connected with a photoelectric detector and connected to the acquisition card through the signal processing circuit. During use, in a vibration-free initial state, the n FBGs are subjected to spectral scanning; the acquisition card synchronously acquires, selects and stores a set wavelength lambda(m) of the FBGs; and the acquisition card acquires reflection light power information of the vibrated FBGs to the lambda(m) according to an acquisition frequency set by the upper computer and sends the information to the upper computer for fast Fourier transformation (FFT) to obtain a vibration frequency of each point. The fiber Bragg grating vibration sensing measurement system can monitor a plurality of points, is high in measurement precision and high in anti-noise property, and can dynamically measure and demodulate high-frequency signals at high speed to instantly obtain a result.

Character spacing values in a document image are extracted and a variance is calculated for fluctuations in the character spacing values. When the calculated variance is lower than a preset threshold value, the document image is determined as having watermark information embedded therein. Such use of the variance in the character spacing values enables high-speed determination of the presence or absence of character-spacing watermark information. At this time, it is possible to speed up the determination by using only some character spacing values in the document, instead of using all character spacing values.

The invention discloses an absolute gravimeter based on vacuum optical tweezers and a measuring method. Micro-nano particles are arranged in a micro-nano particle release device and are located abovethe laser optical tweezers, two beams of capture light in the laser optical tweezers are converged at an intersection point after penetrating through the respective converging lenses, the area where the intersection point is located serves as an optical trap capture area, and the micro-nano particles are stably captured in the optical trap capture area by the two beams of capture light. An opticalinterferometer is electrically connected with a signal processing device, the optical interferometer measures the displacement of the micro-nano particles in real time in the process that the micro-nano particles freely fall from the light trap capture area and sends the displacement to the signal processing device, and the signal processing device obtains the measurement value of the absolute gravitational acceleration according to the real-time displacement of the micro-nano particles and through processing of the method. According to the invention, the absolute gravity is measured by measuring the displacement and time of the micro-nano small balls in the free falling process in real time, the ambient air interference is eliminated, the absolute gravitational acceleration measurement can be realized, and the measurement speed and efficiency are improved.

The invention discloses a probe of a high-resolution large-range optical fiber strain sensor. The probe comprises an optical fiber annular cavity as a reference and an optical fiber grating for measuring strain. The optical fiber annular cavity is mutually close to that of the optical fiber grating. In terms of the high-resolution large-range optical fiber strain sensor, after laser produced by a laser device passes through a beam splitter, a beam of light is used for detecting the optical fiber annular cavity of the sensor after passing through a phase modulator, and an optical sideband signal generated by another beam of light passing through an intensity modulator is used for detecting the optical fiber grating of the sensor. Reflecting light of a detection signal is converted into an intensity signal through a light intensity signal and is demodulated by a demodulator to be used for controlling central frequency of the laser device and that of a sideband signal generator. A strain measuring range exceeding 100micro-strain can be achieved in low sideband modulation frequency of the sensor, and ultrahigh strain measuring precision is kept. Laser wavelength scanning process is avoided, and high-speed measurement can be achieved.

The invention aims to provide a method for extracting anions from a plant medicine by an alkali fusion method performing ion chromatographic detection. The method comprises the following steps: mixing the plant medicine raw material and an alkali fusion agent uniformly; after firing, adding deionized water and dissolving; filtering to obtain anion-containing extracting solution; diluting the deionized water by using the extracting solution to obtain the extracting solution at the required concentration; filtering to obtain the anion-containing solution to be tested; and testing the anions of the solution to be tested by using an ion chromatographic analyzer, wherein the seven inorganic anions have high linear relationship in the range of 0.4 to 12 mg / L; the detection limit is 1.20 to 5.00 ug / L; the labeling recovery rate reaches 70 to 85 percent; and the precision is 0.67 to 5.97 percent. The invention aims to provide a method for extracting and measuring total fluorine, total chlorine, total bromine, total nitrogen, total phosphorus and total sulfur from the plant medicine by the alkali fusion method and provides basis for the growth environment of the plant medicine and research on pharmacodynamic mechanism.

A repair method for the wall surface of a coke oven chamber at the bottom edge thereof is a method for repairing a damaged part on the wall surface of the coke oven chamber close to the bottom thereof, and comprises an oven bottom profile measuring step for determining a oven bottom approximation curve which approximates the oven bottom by measuring the distance between an oven bottom profile measuring device and the oven bottom in the vertical direction while moving the oven bottom profile measuring device along the length of the oven in the coke oven chamber to thereby determine the irregular shape of the oven bottom, an oven wall profile measuring step for determining the irregular shape of the oven wall while moving an oven wall profile measuring device in parallel with the oven bottom approximation curve so that the shortest distance between the shell of the oven wall profile measuring device and the oven bottom approximation curve is at least a first predetermined distance, and a repair step for spraying a repair material from thermal spraying equipment to the damaged part while moving the thermal spraying equipment in parallel with the oven bottom approximation curve so that the shortest distance between the shell of the thermal spraying equipment and the oven bottom approximation curve is at least a second predetermined distance.

[PROBLEMS] To use in a carbon dioxide separation part a gas-permeable membrane capable of maintaining high-speed determination and to diminish the influence of interfering ingredients.[MEANS FOR SOLVING PROBLEMS] An apparatus which comprises: an organic-substance oxidation part in which organic substances contained in a sample water supplied are oxidized into carbon dioxide; a carbon dioxide separation part in which the carbon dioxide contained in the sample water treated with the organic-substance oxidation part is caused to permeate and come into a measurement water; and a conductivity measurement part in which the conductivity of the measurement water sent from the carbon dioxide separation part is measured. The carbon dioxide separation part comprises: a sample water channel in which the sample water treated with the organic-substance oxidation part flows; an intermediate water part in which an intermediate water having a higher pH value in a neutral region than the sample water flowing through the sample water channel is present; and a measurement water channel through which the measurement water comprising deionized water flows. The sample water channel is in contact with the intermediate water part through a gas-permeable membrane, and the intermediate water part is in contact with the measurement water channel through a gas-permeable membrane.

The invention discloses a test method and a tester for a high frequency pulse signal. The frequency, the duty ratio, the amplitude, the rise time and other parameters of the high frequency pulse signal can be measured at high speed and high precision through the core of FPGA and real-time communication between the FPGA and a microcomputer. Through a high-speed comparator, input high frequency pulse signals of different amplitudes are rectified into square wave signals between 0 and 3.3V. The FPGA is input to measure the frequency and the duty ratio. Standard pulse signals are provided by standard rectangular pulse signal system parameter tests. The signal instantaneous amplitude is input into the microcomputer through A / D conversion. The microcomputer directly carries out data sampling and processing to acquire the high frequency signal amplitude. The microcomputer outputs threshold voltage of 10% and 90% amplitudes to the comparator. Two rectified signals are sent into the FPGA. A time interval measuring method is used to acquire the rise time. According to the invention, high-speed and high-precision test of the high frequency pulse signal can be realized.

The invention discloses an engine connecting rod dimension measuring device based on machine vision; the measuring device is featured by comprising the following units: a detection unit comprising a bi-telecentric lens with a scale and an optical imager, wherein the bi-telecentric lens is mechanically connected with the lens of the optical imager through a C-type interface; a screw rod slide way including a servo motor, wherein the detection unit is fixed on the screw rod slide way through a support bolt, the servo motor drives the detection unit to linearly axially move from the initial position of the screw rod slide way to another terminal position; a transmission unit including a conveyer belt and a frequency conversion motor, wherein the frequency conversion motor intermittently runsto transfer to-be-tested rods one by one; a control unit including a programmable controller and an industrial control computer.

The invention provides a parallel confocal annular microstructure measurement device and method based on linear array angular spectrum illumination, and belongs to the field of ultraprecise three-dimensional microstructure surface morphological measurement. The device comprises an angular spectrum scanning illumination circuit and a confocal measurement light path, wherein light beams emitted from a linear array LED array are irradiated to the surface of a detected microstructure sample in parallel through an imaging lens, a beam splitter prism and a microscope objective in sequence; a linear array pinhole array is adopted in the imaging part to be matched with a structure of a linear array image sensor. The method comprises the steps that firstly, tomographic images of pixels on a certain radius under different kinds of angular spectrum scanning illumination are obtained; secondly, the principle of confocal three-dimensional measurement is utilized to judge the axial coordinate of each pixel in the radius direction; at last, fitting of the three-dimensional shape of the detected microstructure sample is achieved. According to the parallel confocal annular microstructure measurement device and method, due to the design, optimal illumination angles corresponding to all parts of the detected microstructure sample can be found out, the strength of detection signals is improved, background noise is lowered, and then measurement precision is improved; meanwhile, high-speed measurement is achieved.

The present invention provides a brominated flame retardant determining method that determines whether or not a brominated flame retardant is contained in a determination target object by emitting light to the determination target object composed of resin, receiving reflected light from the determination target object emitted with the light, calculating an absorption spectrum of the determination target object based on the reflected light, and determining whether or not a brominated flame retardant is contained in the determination target object in the absorption spectrum, based on an absorption spectrum in a wavelength band of 1.40 μm or more and 2.50 μm or less.

The present invention provides a brominated flame retardant determining method that determines whether or not a brominated flame retardant is contained in a determination target object by emitting light to the determination target object composed of resin, receiving reflected light from the determination target object emitted with the light, calculating an absorption spectrum of the determination target object based on the reflected light, and determining whether or not a brominated flame retardant is contained in the determination target object in the absorption spectrum, based on an absorption spectrum in a wavelength band of 1.40 μm or more and 2.50 μm or less.

The invention relates to a measuring method for a non-contact steel rail sagging surface. In the method, a linear structure laser is adopted to emit laser rays to scan steel rails; images irradiated by the laser rays are collected by a camera; the images are processed by a microprocessor to obtain three-dimensional space coordinates of crossing points of the laser rays and the steel rails; a coordinate equation of the two steel rails and the steel rail surfaces can be obtained by carrying out fitting on the three-dimensional space coordinates of different crossing points, and thereby, the coordinate equation of the steel rail sagging surface is obtained; the linear structure laser (1) is controlled by the microprocessor (3) to emit the laser rays to irradiate the steel rails; the collected images are sent to the microprocessor (3) by the camera (2) for processing; and the coordinate equation of the steel rail sagging surface is worked out according to the transformational relation between the two-dimensional coordinate system under a computer image coordinate system and the three-dimensional space coordinates under a world coordinate system.

The invention relates to a signal processing method of a high-frequency sine wave excitation electromagnetic flowmeter. Aiming at the problem of large differential interference of a high-frequency sine wave excitation electromagnetic flowmeter, orthogonal demodulation processing is carried out on a sensor output signal at a zero flow rate of a pipeline to obtain a phase parameter of a differentialinterference component, and then phase adjustment is carried out on an exciting current signal according to the obtained phase parameter value. During actual flow measurement, the phase-adjusted exciting current signal is used as a reference signal; and when the reference signal is used for demodulating a flow signal, a calculation result only containing flow information can be obtained, differential interference is inhibited, and zero output of the system is reduced. Based on the signal processing method, a software system based on a DSP is developed, and flow signals are processed in real time. The software system comprises a main monitoring program, an initialization module, an interruption module, a man-machine interaction module, a watchdog module and a signal processing module.

The invention discloses a monocular-principle-based six-degree-of-freedom position and attitude measuring device for measuring the static balance of a gyroscope. The measuring device comprises an X-axis image acquisition component (10) for acquiring image information of a test sample (40) in the X-axis direction, a Y-axis image acquisition component (20) for acquiring image information of the test sample (40) in the Y-axis direction, a Z-axis image acquisition component (30) for acquiring image information of the test sample (40) in the Z-axis direction, a support frame (1) and a background plate, wherein the X-axis image acquisition component (10), the Y-axis image acquisition component (20) and the Z-axis image acquisition component (30) are arranged outside the support frame (1); and the background plate is arranged in the support frame (1). The measuring device acquires a front view, a side view and a vertical view of the test sample (40) through three cameras, and is not required to be directly contacted with the test sample, so the attitude change of the test sample cannot be interfered, and the device is extremely favorable for improving measuring accuracy.

A first light flux serving as object light is caused to enter a member to be measured, and reflected light thereof is caused to enter again the member to be measured after being diffracted by a first diffraction grating. Then, the second-time reflected light of the first light flux by the member to be measured is diffracted by a second diffraction grating. By diffracting the first light flux by the second diffraction grating, a change of the optical path length caused by tilting of the member to be measured is cancelled.

The invention discloses a resonant cavity enhanced monolithic integrated sensor and a measurement method. The sensor comprises a resonant cavity, a two-dimensional material layer, electrodes, an insulating cladding, couplers, a monochromatic laser, a photoelectric detector, a waveguide, an insulating layer and a substrate layer; the insulating cladding and the two-dimensional material layer are sequentially located above the resonant cavity from bottom to top, the insulating layer and the substrate layer are sequentially located below the resonant cavity from top to bottom, and the waveguide and the resonant cavity are located on the same layer and located on one side of the resonant cavity; one electrode of the two electrodes is located on the waveguide, the other electrode is located onthe two-dimensional material layer, the couplers are arranged at the two ends of the waveguide, and the monochromatic laser and the photoelectric detector are connected with the couplers respectively.The sensor can be used for on-chip detection of waveguide environment refractive index change caused by biochemical molecules or on-chip detection of absorption spectra of the biochemical molecules.

The invention provides a part size measurement method based on a charge coupled device (CCD). According to the part size measurement method, feature point recognition technology is adopted, pixels are classified through feature points of a part, the size of the whole part is measured, prior knowledge of the part is not required, and measurement for the common part is achieved. According to the method, high-speed measurement is conducted, and meanwhile a precision requirement is met. The part size measurement method based on the CCD is simple in algorithm, low in cost and good in application prospect due to the facts that only the CCD and a computer are required for hardware implementation and a complex mechanical structure is not required.