63results about How to "Achieving Accurate Measurements" patented technology

The invention discloses a railway infrastructure detection system. The system involves a positioning synchronization subsystem, and a rail geometry detection subsystem, a rail contour detection subsystem, a rail state detection subsystem, a rail wheel force detection subsystem, a catenary geometric parameter detection subsystem, a pantograph-catenary current collection parameter detection subsystem which are in communication with the positioning synchronization subsystem. According to the system, on the basis of the structural characteristics and operation modes of urban rail transit infrastructure, the plurality of detection subsystems are integrated on a urban rail transit electric bus, rail geometric parameters, rail contour abrasion, rail state information, rail wheel interaction force, catenary geometric parameters and pantograph-catenary current collection parameters of the urban rail transit infrastructure are synchronously collected and accurately measured, the detection efficiency is improved, the urban rail transit operation maintenance cost is reduced, and the system can be widely applied to urban rail traffic construction and operation and maintenance.

The invention discloses a method for automatically calculating the crown projection area of a single tree based on vehicle-mounted laser point cloud data, and specifically relates to a cross field of geographic information and information technologies. The method for automatically calculating the crown projection area of a single tree based on the vehicle-mounted laser point cloud data is characterized in that ground feature point cloud to be classified is acquired through preprocessing original point cloud data by using three-dimensional point cloud data acquired by a vehicle-mounted laser mobile measurement system, a single tree is accurately recognized according to characteristics of different ground features by using a classification method of hierarchical projection, and automatic calculation for the projection area of the single tree is realized by further utilizing a convex hull algorithm. According to the method, the single tree is extracted from mass point cloud data, and a problem of single tree extraction is solved. Furthermore, calculation for the crown projection area is performed, so that a problem that the crown projection area of the single tree is difficult to be measured accurately is solved, and automatic calculation and accurate measurement for the crown projection area of the single tree are realized.

A method for measuring the positioning parameter of automobile front wheel includes using cross point of master pin and knuckle axis as point of origin to measure out and alpha for any three positions, measuring external angle of dip alpha at front wheel turnangles as delta o, measuring gamma at turnangle as delta o1 to right and measuring alpha at turnangle as beta o2 to left, substituting measured data to formula sin betao=*** and sin gamma=ay/(Cos*** to solve out internal angle of dip for master pin.

A precise shaft dynamic torque measuring instrument relates to a shaft measurement technology and solves the problem that shaft friction torque can not be accurately measured and the test scope is small. The precise shaft dynamic torque measuring instrument comprises a structure adjusting subsystem, a pitching and yaw detection shaft subsystem, a positioning installation subsystem, a lateral roller detection shaft subsystem and a support and detection platform subsystem and measures friction torque of a fake load on vertical shaft direction. A torque motor drives a torque sensor to rotate through a toothed shaft, the displacement is adjusted on the vertical and horizontal direction, and a handwheel is rotated to move a leading screw nut mechanism vertically or horizontally along a linear guide rail. A rotary table drives a vertical sliding bench fixed together with a connection board to realize rotation of changing angle at certain level. A counterweight block is added on a fixed pulley on the vertical sliding bench to prevent extra torque, and verticality precision is ensured.

The invention relates to a calibration control system and method for an attitude control engine vector thrust measuring device and solves the problems that an existing vector force sensor is relatively high in uncertainty of a measurement indicating value of a sensor and repeatability is poor if field calibration correction is not performed. The control system comprises a control module, an acquisition module unit, a storage module, a data processing module and a loading mechanism; the loading mechanism comprises a transfer disk, a standard force sensor and an electric cylinder; the transfer disk is used for mounting and connecting a calibrated object, one end of the standard force sensor is connected with the transfer disk, and the other end of the standard force sensor is connected withthe electric cylinder; the control module is used for realizing control on expansion amount of the electric cylinder, the electric cylinder outputs a calibration force to the standard force sensor, and the standard force sensor transmits the calibration force to a six-component sensor by virtue of the transfer disk; and a numerical value acquired by the acquisition module unit is transmitted to the storage module to be stored, the storage module transmits the stored data to the data processing module, the data processing module comprises a decoupling module, and the decoupling module performsa decoupling operation on the data.

The invention provides a system and method for optical coupling image acquisition time calibration. The system for optical coupling image acquisition time calibration comprises a system time master control module, a logic control module, a time light generating module, a trigger module, a camera, an image sensor and an image processing module; wherein the system time master control module providesa reference time for the logic control module and the trigger module; the logic control module generates an electrical parameter control signal and a periodic control signal based on the reference time; the time light generating module comprises a light source matrix sub-module and an electrical parameter sub-module; the trigger module generates a trigger signal based on the reference time; the camera forms an optical path, and generates an acquisition control signal after the camera is triggered by the trigger signal; the image sensor is triggered by the acquisition control signal to receivethe optical matrix information and the reflected light of a measured object, so as to obtain a first image; and the image processing module converts the optical matrix information to the image acquisition time information to obtain a second image, wherein the second image is the first image marked the time information. By means of the system and method for optical coupling image acquisition timecalibration, the time that the camera shoots the image can be accurately located in extreme environments.

The invention provides a capacitive touch sensor. A single sensing unit structure of the capacitive touch sensor is triangular, and is composed of an upper polar plate, a lower polar plate and a dielectric layer. The upper polar plate and the lower polar plate are correspondingly arranged; the upper polar plate comprises three first polar plates, the lower polar plate comprises three second polarplates, the first polar plates and the second polar plates are isosceles triangles with vertex angles of 120 degrees, the vertex angles of the three first polar plates are oppositely arranged, top ends of the three second polar plates are connected with one another, and the three first polar plates and the three second polar plates jointly form three independent capacitors; and through a structural arrangement, the number of polar plates and the number of capacitors are reduced, and a measurement circuit is greatly simplified so that accurate measurement and decoupling of a three-dimensional force are realized.

The invention relates to a test instrument and method for evaluating the upheaval risk of a bituminous pavement. The test instrument comprises a left side and a right side. An environment box is arranged on the left side, and a control box is arranged on the right side. An alternating current generator is arranged below the control box. A wind-heat temperature control device and a connecting rod control device are sequentially arranged below the left side of the alternating current generator downwards, and a rail running device, a control system and a laser signal processor are sequentially arranged below the right side of the alternating current generator downwards. An electromagnetic emission device is arranged on the top in the environment box, rails are arranged on the two side walls, and a test mold for containing a sample is arranged at the bottom. The two rails are provided with scale marks, one rail is connected with a laser emitter, and the other rail is connected with a laser receiver. Four temperature sensors are arranged on the two sides of the two rails in total. An infrared thermal imager is arranged below the temperature sensor D and connected with the inner side wall of the environment box through an angle adjusting device. Compared with the prior art, the test instrument and method are easy and convenient to operate and rapid in measurement, and the induction heating process is easy to control.

The invention relates to a mixed gas photoacoustic spectrum recognition method and device based on deep learning, and the method comprises the steps: obtaining the photoacoustic spectrums of a plurality of mixed gases, and recording the photoacoustic spectrums as first photoacoustic spectrums; sequentially performing Fourier deconvolution and bilateral filtering on the plurality of first photoacoustic spectra to obtain a plurality of second photoacoustic spectra; carrying out peak division on the second photoacoustic spectra by utilizing a derivative method, and then extracting waveform characteristics and gas characteristic information of each waveband; constructing a multi-dimensional vector by utilizing the waveform characteristics and the gas information, and constructing a sample dataset; and training a target recognition neural network by using the sample data set, and inputting a photoacoustic spectrum to be recognized into the trained target recognition neural network to obtain recognition information. According to the method, a traditional filtering method and a derivative method are combined to perform peak division on overlapped peaks, then the target recognition neuralnetwork is utilized to recognize the photoacoustic spectrum, the recognition speed is high, the cost is low, and the stability is good.

Belonging to the technical field of asphalt performance testing, the invention in particular relates to an instrument and method for measuring the volume change of an asphalt mixture test piece during induction heating. The instrument comprises an electromagnetic emission device, telescopic conductive connecting rods, a temperature sensor A, a temperature sensor B, a temperature sensor C, a temperature sensor D, a temperature sensor E, camera positioning devices, cameras, scale, a test piece 11, patches, fixation rods, an interface, a screen, a control keyboard, an alternating-current generator, an image analysis device, a wind-heat temperature control device, a connecting rod control device, an image acquisition device control system, a control cabinet, a controller, an environmental cabinet and a telescopic rod. Compared with the prior art, the instrument provided by the invention has the advantages of simple structure, convenient operation, and good use effect, and can simply and rapidly measure the volume change condition of the asphalt mixture test piece during induction heating. Also, the induction heating process is easy to control.

The invention discloses a three-phase reactive power measuring and crosstalk compensating method for an electric energy metering chip. The method comprises the following steps of calculating each single-phase reactive power; compensating each single-phase reactive power, so as to obtain the compensated single-phase reactive power; carrying out small-signal detection, and according to the detection result, selecting the single-phase reactive power or the compensated single-phase reactive power to calculate the total reactive power; and carrying out inverse compensation on the total reactive power. The method has the advantages that the accurate measuring of the three-phase reactive power is realized; and the problem of calculation error of the reactive power caused by the easy influence of crosstalk noise on the small signal in the electric energy metering chip is solved.

The invention discloses an aluminum alloy sheet testing system. The aluminum alloy sheet testing system comprises a heating module, a cooling module and a stretching device, wherein a clamping part inthe stretching device clamps an aluminum alloy sheet to be tested, the aluminum alloy sheet is firstly moved to the heating module to be heated, then the aluminum alloy sheet is moved to the coolingmodule to be cooled, and the aluminum alloy sheet is stretched and loaded by the stretching device. The aluminum alloy sheet testing system has the main beneficial effects that the structure is simpleand compact, the temperature control module is integrated on a common tensile testing machine, aluminum alloy high-temperature deformation behavior testing under a complex process path is achieved, sample clamping is convenient, temperature data and strain data are reliable, and the testing efficiency is improved. According to the method, the temperature uniformity in the scale distance section of the sample is improved in a contact heating mode, the heating efficiency of the sample is improved, and the purpose of testing deformation and fracture behaviors related to the temperature and the strain rate under the aluminum alloy hot stamping condition is achieved.

The invention relates to a high/low-temperature complex atmosphere environment loading device, and belongs to the field of high/low-temperature mechanical property testing of materials. The device comprises a vacuum/inert atmosphere environment construction unit, a high-temperature environment construction unit and a low-temperature environment construction unit, the vacuum/inert atmosphere environment construction unit is in rigid connection with an external mounting platform through a base and is matched with an external guide rail through rolling wheels, and free movement of the whole device in the direction of the guide rail is achieved; the high-temperature environment construction unit is connected with the front fixing assembly and the rear fixing assembly through connecting rods; and the low-temperature environment construction unit is connected with the front fixing assembly and the rear fixing assembly through refrigerant pipes I-IV. The device has the advantages that varioushigh-resolution in-situ imaging devices can be flexibly integrated, and in-situ monitoring of the macro-micro morphology of the surface of a tested material sample is achieved; one or more kinds of mechanical loading equipment can be integrated, and loading of single and composite loads of a tested material sample is achieved; a vacuum/inert atmosphere assembly can be integrated, and constructionof a vacuum/inert atmosphere environment is achieved.

The invention relates to a pulse per second generating device and method and a measuring system and method of a digital clock and belongs to the field of digital clock metering. A photoelectric diodeis used for detecting a second-bit nixie tube of a digital clock, multiple paths of detection signals are amplified through an amplification circuit to obtain voltage signals, TTL level signals are output after the voltage signals are compared with preset voltage, and the TTL level signals are sent to a pulse generation circuit directly or after being inverted through an inverter to generate pulsesignals. And finally, OR operation is conducted through a second pulse synthesis circuit to generate a second pulse signal of a digital clock, a reference time signal generated by a reference time frequency source is taken as a starting signal, the second pulse signal is taken as a stopping signal, and a time interval error between the starting signal and the stopping signal is measured; and thus, accurate measurement and calibration of the digital clock are realized.

The invention provides a signal analyzer with a high-precision calibration function and a high-precision calibration method thereof, and the signal analyzer comprises a calibration module which employs a digital scheme and is used for outputting a broadband calibration signal, and the broadband calibration signal is a signal with a uniform frequency interval and a target phase; the radio frequency front end is connected with the calibration module and is used for performing amplification, attenuation, filtering and initial frequency conversion on the broadband calibration signal and outputting a target signal; the intermediate frequency module is connected with the radio frequency front end and is used for performing frequency conversion processing on the target signal for multiple times and outputting a target digital signal of a target frequency; and the digital processing module is connected with the intermediate frequency module, the digital processing module is used for carrying out digital down-conversion processing and fast Fourier transform processing on the target digital signal to obtain a target frequency domain signal, and the target frequency domain signal is used for determining a frequency response curve of the signal analyzer. The signal analyzer can realize high-precision calibration.

The invention discloses a vibration blunt depth measuring device, belongs to the field of engineering construction, and provides a vibration blunt depth measuring device capable of measuring the depth of a vibration blunt quantitatively. The vibration blunt depth measuring device comprises a mounting seat, a supporting rod, a wheel and a rotary encoder module, wherein one end of the supporting rod is arranged on the mounting seat; the other end of the supporting rod is provided with a mounting rack; the wheel is rotatably arranged on the mounting rack through a rotating shaft; and the rotary encoder module is arranged on the mounting rack and is connected with the rotating shaft through a coupler. The vibration blunt depth measuring device is arranged on corresponding construction equipment, a corresponding mooring rope is meshed in a slot of the wheel, the wheel and the mooring rope cannot slip relatively, the mooring rope moves so as to drive the wheel to rotate, the rotating angle of the wheel is obtained through the rotary encoder module, the movement distance of the mooring rope is obtained, and a measuring value of the depth of the vibration blunt can be obtained.