199results about How to "Realize dynamic measurement" patented technology

A combined interference device for measurement of aspheric surface includes a laser, a spatial filter, two beam expanding systems, a beam shrinking system, a spectroscope, a convertible lens, three polarizers, two optical plates, four circular optical wedges with small wedge angle, a beam-dividing grating, a 1/4 wave plate, a polarizer group and a CCD. In the device, real-time measurement is realized through simultaneous phase-shifting method, and frequency conversion function is realized through rotating two pairs of double optical wedges. The experimental device adopts common optical elements, so the cost is low, and the device can measure aspheric surfaces of different diameters and is suitable for the plane and the sphere. The real-time high precision measurement in conventional environment can be realized, and the invention has frequency conversion function, which is very effective for treating the mirror surface with discontinuous regions.

The invention relates to a wearable self-powered multi-physiological-parameter monitoring device and method. The device is composed of a waistband measuring unit, a wristband measuring unit and a smart phone, and breath, snore and pulse signals of a human body are monitored, converted into digital signals and then transmitted to the smart phone wirelessly for storage, data processing, display and remote diagnosis. Real-time receiving and displaying of physiological parameters such as pulse, breath and blood pressure and record of sleeping condition are realized. Under the condition of using a pressure cuff, three physiological parameters such as pulse, breath and blood pressure are dynamically measured continuously in a non-compressed manner, so that a user can know physiological parameters of own pulse, breath and blood pressure in real time. The device is light and comfortable to wear, and has the advantages of low cost, easiness in production and accuracy in monitoring; a power generating module and a charging circuit are designed, so that endurance of the device is improved greatly, and the device is suitable for being used in hospitals and by individuals for a long time.

An adaptive window Fourier phase extraction method in optical three-dimensional measurement, which can be used to process a gray scale sine grating fringe diagram, is characterized by: (1) Carrying out empirical mode decomposition on a row of fringe signals so as to obtain a series of intrinsic mode functions; (2) Calculating an instantaneous frequency and a marginal spectrum of each intrinsic mode function, selecting the instantaneous frequency which can accurately describe a fringe signal change through analyzing the marginal spectrum; (3) Determining a background component of the fringe signal; (4) Using the determined instantaneous frequency to adaptively position a local stationary area and accordingly calculating a scale factor of a Gaussian window; (5) After removing the background component from an original signal, carrying out adaptive window Fourier transform so as to obtain a wrapped phase distribution. A global wrapped phase can be obtained after carrying out the above steps line-by-line. After expansion, an absolute phase can be obtained and can be converted into height information so that the three-dimensional measurement of an object can be realized. The method of the invention has strong adaptability. By using the method of the invention, measurement precision of measuring the object with a complex surface shape or containing an abrupt edge can be increased.

The invention discloses a test method of instantaneous luminous flux of an LED based on a PWM drive technology and a device thereof, and belongs to the measurement field. The method comprises the following steps: measuring the luminous flux of the LED to be tested by an integrating sphere method, providing an acquisition system which consists of a signal acquisition part, a signal conversion part and a data processing part in addition to a conventional spectral analysis system and a conventional spectral analysis device, measuring the instantaneous luminous flux of the LED to be tested under the PWM pulse drive, and multiplying the duty ratio of a PWM pulse signal with the instantaneous luminous flux to obtain the average luminous flux of the LED to be tested under the PWM pulse drive. The method is based on the existing test equipment, does not deviate from the traditional test methods, does not cause new near-field absorption, can respond to instantaneous peak signals of the pulse drive, helps measure the instantaneous luminous flux of the LED under heat equilibrium condition, and can help realize the dynamic measurement when the pulse drive power changes. The method and the device can be widely used in the fields of performance tests and the calibration of various LEDs and/or PWM pulse drive devices.

The invention provides a track dynamic measuring system and method. The track dynamic measuring system comprises a longitudinal beam, a transverse beam, a total station instrument, a controller, an inertial navigation device, track gauge sensors and a mileage sensor. By using the track dynamic measuring system and method, the track measuring efficiency can be greatly enhanced on the premise of guaranteeing the absolute measuring accuracy of the track, can avoid problems that GNSS signals are missing in long and bid tunnels and the measuring accuracy does not satisfy the use requirement and can realize the balance between the track dynamic measuring accuracy and the track dynamic measuring efficiency.

The invention provides a non-contact multipoint high-frequency dynamic bridge deflection detection method. N laser range finders are arranged below the bridge; a reflection target is arranged at a pier; when the bridge does not suffer from additional load, the laser range finder is opened, a distance L1 of each laser range finder when the bridge does not suffer from additional load is measured, and deflection yi at the bridge position corresponding to each laser range finder is calculated; within a certain measurement range, the n laser range finders are repeated at a time interval of mu second, one end point of the bridge serves as a coordinate origin O, the longitudinal direction of the bridge is X axis, the downward direction perpendicular to the bridge surface is Y axis, an X-coordinate xi of a detection point and the deflection value yi measured in real time are inputted, and integrated coordinate data are fitted to a deflection curve. Non-contact measurement can be realized, and compared with the traditional mode of manually using a dial indicator for detection, remote operation and control can be realized, automation can be realized, and the measurement is more convenient.

The invention relates to a new improved three-dimensional measurement method based on Stockwell transform. The invention mainly aims at precisely solving the phase distribution of a stripe image and getting three-dimensional appearance information of an object by the phase distribution. The implementation steps are as follows: projecting a black and white sine stripe image on the measured object; performing the Stockwell transform on the deformation stripe image which is collected by a CCD (charge coupled device) line by line, extracting a Stockwell transform ridge, then figuring out and removing errors caused by phase two-order derivation during the process of seeking the ridge, and finally getting a precise window size matrix; substituting the precise window matrix into a window Fourier transform, and calculating relative phase information of a deformation stripe pattern through filtration and other steps; establishing a quality map of the stripe pattern, then performing phase unwrapping by adopting a flood fill algorithm, and getting the absolute phase distribution of the stripe image; and getting the three-dimensional information of the measured object by the absolute phase distribution according to a phase-to-height conversion formula.

The invention discloses a device for dynamic testing of the contact pressure of a contact terminal of an alternating-current contactor. The device for dynamic testing of the contact pressure of the contact terminal of the alternating-current contactor comprises an upper computer and a lower computer, wherein an industrial personal computer serves as the upper computer, the lower computer comprises a contact terminal contact pressure sensor, a charge amplifier, a signal conditioning circuit, a high-speed data acquisition card and a closing phase angle controller, and the alternating-current contactor is a testing sample. The device can directly reflect the dynamic changing process of the contact pressure of the contact terminal, reflect the bouncing condition of the contact terminal more visually, and solve the problem of asynchronization of two contacts of the same touch bridge during closing. Contact pressure signals of the contact terminal can provide new data for the study of the dynamic parameters, such as the optimal closing phase angle, of the alternating-current contactor in the future, the intensive study of the relations between the contact pressure of the contact terminal and other parameters such as the contact resistance and the contact vibration at the moment of contact terminal contacting, and the optimization design of the alternating-current contactor.

The invention discloses an improved window Fourier three-dimensional measuring method based on wavelet transform. The method mainly aims at solving precise phase distribution of stripe images and obtaining three-dimensional shape information of an object through the phase distribution. The method includes the steps that black-and-white sine modulation stripe images are projected on the object to be measured and collected by a CCD, the wavelet transform is carried out on the collected and deformed stripe images line by line, a wavelet transform ridge is extracted and calculated, errors caused by a phase second derivative during ridge extraction are divided, and finally a precise window size matrix is obtained. The precise window matrix is substituted into window Fourier transform, and corresponding relative phase information of the deformed stripe images is obtained after steps such as filtering. A stripe image quality diagram is established, phases are then expanded by means of the deluge algorithm, and absolute phase distribution of the stripe images is obtained. According to the phase height conversion formula, the three-dimensional information of the object to be measured can be obtained according to the absolute phase distribution.

The invention discloses a human body identity identification and verification method and a human body identity identification and verification device, which belong to the technical field of identity identification and verification, and aim to realize identification and verification of human body identities more precisely. The human body identity identification and verification method comprises the specific steps that a camera acquires a video stream of a face of a detected person and transmits the video stream to a computer, the computer performs image extraction of the face and extracts heart rate data of the detected person through utilizing an image photoplethysmography by means of openCV software on the computer, compares a face image with face image data with a known identity stored in the computer, and the detected person passes the human body identity identification and verification when the face image is successfully compared with the face image with the known identity stored in the computer and the comparison between heart rate data information with original set heart rate threshold information is determined to pass. The human body identity identification and verification device comprises the camera and the computer. The human body identity identification and verification device and the human body identity identification and verification method can realize face identification on the basis of living body detection, improves the identification efficiency and enhances the safety factor.

The invention discloses a test system and method for studying gravity type anchorage stability under a seismic load. The system comprises an anchorage system, a load system and a measuring system; theanchorage system is composed of a test chamber, a similar rock-soil layer, an anchorage body and a steel strand; the load system comprises a static load system and a dynamic load system; the static load system is composed of a weight, a gate-type loading frame, a pulley and the steel strand; the dynamic load system is composed of a vibrating table, a wood board and a sponge; and the measuring system comprises a precise dynamometer, an angle measurer, a micro pressure box, a laser range finder and a sound wave vibration measurer. The specific operations of the system comprise the following steps: producing a test module, arranging a monitoring system, loading the test module, debugging the monitoring system, model test testing and data recording. According to the test system for studying the gravity type anchorage stability under the seismic load provided by the invention, the simulation of different anchorage test prototypes can be realized, the dynamic response change of the anchorage body under the action of the seismic load is simulated simply and effectively, and the dynamic measurement of dynamic response data such as internal force, displacement, vibration speed and the likeof the anchorage body and surrounding rock and soil bodies in the loading process of dynamic loads is realized.

The invention discloses a dynamic measurement system of digital speckle interference tiny in-plane deformation and a measurement method. The dynamic measurement system is characterized in that emergent light of a low-coherent laser device is divided into transmission light and reflection light through a light splitter; the transmission light is subjected to beam expansion and then irradiates a measured object surface; the reflection light passes through a plane mirror and a beam expanding mirror and then irradiates the measured object surface; diffuse reflection light of a measuring surface is divided into two beams of light through a light splitting prism; the two beams of light pass through the plane mirror, a diaphragm, an imaging lens and the light splitting prism respectively and then are imaged onto a CCD (Charge Coupled Device) camera. The dynamic measurement system disclosed by the invention can be used for carrying out dynamic measurement on the tiny in-plane deformation of a measured object and is a full-field, high-precision and easy-to-operate measurement system.

Provided is a helicopter rotor blade dynamic trajectory measuring method based on four-nocular stereo vision. The method comprises the following steps that 1, mark points are uniformly stuck to the two sides of each rotor blade of a helicopter; 2, four-nocular cameras are pairwise matched to form four binocular stereo vision systems, and calibration is conducted on each system; 3, conversion relations between coordinate systems of the four binocular stereo vision systems and a coordinate system of a total station are obtained by using the total station; 4, three-dimensional information of the mark points in rotor blade image pairs collected by the four binocular stereo vision systems is calculated; 5, the rotor blade mark point three-dimensional information obtained through measurement of the four binocular stereo vision systems is unified into the coordinate system of the total station, and rotor blade dynamic trajectory measurement based on the four-nocular stereo vision is achieved. The helicopter rotor blade dynamic trajectory measuring method based on the four-nocular stereo vision has the advantages that three-dimensional reconstruction on rotor blade motion trajectories can be completed, the field of view is wide, a non-contact type is achieved, the precision is high, and the safety is good.

The present invention discloses a roller-type test device for dynamically monitoring the bending angle. On the longitudinal surface of the base of the roller-type bending test device, an angle measurement and monitoring device for dynamically monitoring the bending angle of the bending test piece is fixedly connected. The above-mentioned angle measurement and monitoring device includes a pointer assembly, which is movably connected to the rear end of the bending indenter of the main body of the roller bending test device through the center of the angle scale plate engraved line, and the pointer rod is connected to it by a vertically fixed pointer extension rod The rollers form the pointer assembly, and the rollers are in contact with the surface of the sample. During the test, the angle indicated by the pointer is kept consistent with the bending angle of the sample 7. When the sample 7 bends under the action of the bending indenter test force, it drives When the roller rotates, the roller 17 transmits the rotation to the pointer 3, and the bending angle of the sample 7 is indicated on the angle scale plate through the needle point. Through the invention, the actual bending angle of the sample can be monitored in real time, and the test process of the sample can be precisely controlled.

The invention discloses a distributed optical fiber sensing system, which comprises a narrow linewidth laser, a modulator, an optical isolator, an erbium-doped optical fiber amplifier, a circulator, an optical fiber grating, a sensing optical fiber, an optical detector, a microwave amplifier, a high pass filter, a power distributor, a first filter module, a first microwave detection module, a first low-frequency amplifier, a second filter module, a second microwave detection module, a second low-frequency amplifier, a data acquisition card and a computer. Distributed optical fiber vibration or sound signal measurement is realized, dynamic large-phase signal measurement is effectively realized, a phase cancellation and fading problem can be eliminated, a high-speed data acquisition device with a GS/s sampling rate is not needed, the cost is reduced, the response time is not influenced, the strength and the frequency shift changes of Brillouin scattering light can be measured respectively on the premise of eliminating instability of a laser source and line loss, and temperature changes and the strain are further obtained.

The invention provides an online detection method for the spatial position of roller axis based on machine vision. The online detection method is capable of obtaining the moving trajectory of the central rotation axis of a roller so as to realize the online precision measurement of the central rotation axis of the roller. The method comprises the following steps: building a binocular stereo vision three-coordinate measuring model; choosing one point from the end face of the roller as the monitoring point for the end face of the roller; according to the created binocular stereo vision three-coordinate measuring model, obtaining the three-dimensional spatial coordinate of the monitoring point for the end face of the roller; during the operation of a rolling mill, obtaining the three-dimensional spatial coordinates of the monitoring point for the end face of the roller at different positions along with the rotation of the roller; according to the obtained three-dimensional spatial coordinates of the monitoring point for the end face of the roller at different positions along with the rotation of the roller and based on the stereo geometrical characteristics of the roller, obtaining the moving trajectory of the central rotation axis of the roller. The online detection method is suitable for the detection of key parameters of rolling mill associated equipment.

The invention provides a reaction thermogravimetric analysis system for a synergistic heating process of electrical heating and microwave heating and relates to a reaction thermogravimetric analysis system. The system solves the problems in the prior art that the temperature field of each part within an entire region cannot be well reflected through the temperature measurement of either a thermocouple or an infrared thermometer and no reaction thermogravimetric equipment for realizing the synergistic heating process of electrical heating and microwave heating is available. According to the technical scheme of the invention, the outer wall of a reaction tank is provided with a microwave heating system. A furnace tube successively passes through the reaction tank and a furnace lining from top to bottom. At least two silicon carbide rods are arranged in a hearth and are positioned closer to the furnace tube. A sample bracket is arranged in the furnace tube in the penetrated manner. The top end of the sample bracket is provided with a sample crucible. The bottom end of the sample bracket is provided with an electronic balance. The bottom end of the furnace tube is communicated with an atmosphere adjustment system. One end of a filter vat is communicated with the top of the furnace tube. The other end of the filter vat is connected with a computer via a flue gas analyzer. The temperature measurement terminal of a thermocouple is placed in the hearth. The system is applied to reactions during the synergistic heating process of electrical heating and microwave heating.

The invention discloses a method and device for measuring the motion error of five degrees of freedom of a main shaft based on a cylindrical surface capacitor sensor. A stator is arranged at small end of a stepped rotor; four radial electrodes are arranged in the inner cylindrical surface of the stator; four electrodes and the small end of a rotor form four capacitors; and four equally-distributed end face electrodes are arranged on the lateral surface of the stator on one side of the large end face close to the stepped rotor and form another four capacitors with the large end of the rotor. In the measurement process, the rotor and the main shaft to be measured are fixedly connected together and synchronously rotate along the main shaft; the stator is fixedly arranged by a strut member; and the electrodes arranged on the stator and the electrodes on the rotor form capacitors. In the rotating process, when the main shaft radially jumps, axially plays or deflects, parameters of corresponding capacitors are changed and the capacitor values are correspondingly changed; and the motion displacements of the main shaft in the direction of five degrees of freedom in the rotating process can be obtained by measuring the set capacitor values and correspondingly and mathematically calculating the capacitor values. The device has simple structure and low cost.

The application provides a high-performance distributed optical fiber sensing system based on Hz EHz ultrafast pulse scanning. When performing disturbance signal testing, the internal variable-frequency pulse light emitted by the Hz EHz ultrafast pulse scanning laser enters the sensing optical fiber through a circulator, a backward Rayleigh scattering signal emitted by the sensing optical fiber enters an unbalanced Michelson interferometer through a coupler, the backward Rayleigh scattering lights at the arm length location of two adjacent interference arms are in interference one by one by designing the arm length arm of two interference arms; therefore, the signal received after passing through the unbalanced Michelson interferometer contains a phase difference signal caused by an external disturbance signal on the sensing optical fiber; and finally, a phase demodulation unit is used for demodulating the change of the relative phase difference signal along with the time, and then thedynamic measurement on a disturbance signal in the sensing optical fiber can be realized. And meanwhile, the Hz EHz ultrafast pulse scanning laser can effectively realize the simultaneous monitoringin the long distance, high-frequency band signal and high-space resolution.

The invention relates to the field of small animal imaging, solves the problems that in the prior art, the image resolution is low and the image acquisition time is long, provides a photon counting-type dynamic diffusion fluorescence tomography system which has high sensitivity and image resolution and achieves the purpose of dynamic diffusion fluorescence tomography with short measurement time. In order to achieve the purpose, the invention adopts the technical scheme as follows: the photon counting-type dynamic diffusion fluorescence tomography device comprises a light source system used for fluorescence excitation, an imaging chamber system used for fixing and moving a detected object, a light switch used for switching a detection passage, a light-filtering system used for filtering off excited light signals, a detection system used for detecting light signals, and a computer used for integrated control of an attenuator, the light switch, a motor-driven light filtering wheel, a photomultipler tube and a photon counting module as well as image reconstruction. The invention is mainly applied to small animal imaging.

The invention discloses a wall brick hygroscopic-expansion-deformation dynamic testing instrument and testing method. The testing instrument comprises a dial indicator, a measuring frame, an electronic balance, a humidistat, a balance hood and a computer, wherein a glass dial indicator pedestal and a glass specimen pedestal are respectively provided with holes, and two quartz tube end sockets are respectively arranged in the holes on both sides; a first threaded rod is respectively arranged in each quartz tube, and is fixedly connected with a first nut and a second nut, and a first spring washer, a second spring washer, the quartz tube, the glass dial indicator pedestal and the glass specimen pedestal are respectively connected flexibly; the balance hood is used for ensuring the humidity in the humidistat from interference of the external environment; and a crystallizing dish containing a saturated solution is arranged in the humidistat and used for controlling and maintaining the humidity in the box body. The dynamic testing instrument can dynamically measure the air hygroscopic expansion deformation amount and hygroscopic capacity of the wall brick to obtain the expansion value-humidity content characteristic curve under isothermal conditions, thereby enhancing the measurement accuracy.

The related hyetometer comprises: a rain collector with a water outlet pipe, a capacitor-type liquid level sensor, and a signal process circuit. Wherein, on the pipe, it arranges an electric control valve with input end control ends connected to the signal circuit and a control circuit with output end connected to the control end of valve. This invention realizes dynamic measurement, and can avoid information loss in draining.