38 results about "Measurement precision" patented technology

The invention discloses a sensor for monitoring metal abrasive particles in oil liquid on line. The sensor is a mutual inductance sensor and comprises an exciting coil and an inducting coil, wherein an oil path through which the oil liquid can pass is arranged in the center of a framework made of a magnetic inert material; the exciting coil and the inducting coil are coaxially wound on the framework; the inducing coil is positioned between the exciting coil and the framework; the axial length of the inducting coil is 1/4-1/2 of that of the exciting coil; and the axial center points of the inducting coil and the exciting coil are superposed. The sensor realizes zero compensation and adjustment by adopting a parallel measurement structure and is simple in structure, high in sensitivity, high in linearity and high in interference resistance. The sensor applied to on-line monitoring for the metal abrasive particles in the oil liquid is convenient to operate, high in instantaneity, high in measurement precision and accurate and reliable in monitored result and can be widely applied to military and civil fields and used for monitoring the pollution degree and the abrasion to the oil liquid of lubricating systems of mechanical equipment such as various air planes, naval vessels and automobiles and monitoring and diagnosing faults of the lubricating systems of the mechanical equipment to avoid safety accidents.

The invention relates to the technical field of fluid measurement, and provides a flow rate measuring system and a flow rate measuring method for multi-phase fluid. The system comprises a measurement module, a signal amplification module, a data processing module and a terminal module which are connected in turn, wherein the measurement module at least comprises two measurement devices arranged on a pipeline at a certain interval, and the two measurement devices respectively measure the content of the same element passing the sections where the devices are positioned by a nuclear physics method; the signal amplification module is respectively connected with the two measurement devices and amplifies signals acquired by measurement; and the data processing module converts the signals into digital signals first, then performs digital lowpass filtering treatment and quantization treatment on the digital signals, establishes a mathematical model by utilizing a cross-correlation function principle, performs data analysis treatment on the digital signals, and outputs results of a flow and a flow rate to the terminal module. The system and the method reduce the measuring complexity, reduce corresponding errors caused and improve measuring accuracy and reliability.

The invention provides a pre-alignment device and method of square substrates. The pre-alignment device of the square substrates is used for measuring the piece feeding error (eccentricity and deviation of substrates) of a mechanical arm in the substrate transmission process, and the measurement process is named as pre-alignment. In the method, a mechanical arm, a workpiece platform, a first detector, a second detector and a controller are mainly adopted, wherein the square substrates are loaded on the workpiece platform, the first detector is used for scanning the first edges of the square substrates and calculating the deviation values of the first edges; the second detector is used for scanning the second edges of the square substrates and calculating the deviation values of the second edges, and the second edges are vertical to the first edges; the controller is used for controlling and driving the workpiece platform according to the deviation values of the first edges and the deviation values of the second edges. The pre-alignment device and method of the square substrates, provided by the invention, generate no damage to the square substrates, save the time and improve the economic efficiency. Since an edge scanning surface manner is adopted, numerous sampling points are adopted and are close to the actual states of the edges, thereby improving the measuring precision.

The invention provides an automatic calibration device for a multi-parameter physiological signal simulator. The automatic calibration device is designed in order to solve the technical problems that when measurement calibration is performed on an electrocardiosignal simulator or a multi-parameter physiological signal simulator at present, as a makeshift way is adopted, the signal is not stabilized, amplification factors cannot be adjusted, efficiency and precision are low, performance is unstable, and tracing is not available. According to the automatic calibration device, a signal input interface is directly connected with the calibrated simulator, and measurement calibration is performed on the calibrated simulator through a calibration output interface; tracing can be performed on time and voltage reference, multiple parameters such as the frequency and voltage of the calibrated simulator are traced to national measurement standards, and a communication interface is connected with an upper computer so that calibration data can be directly converted into a calibration record and saved. The automatic calibration device has the advantages that the structure of the device is compact, the calibration process is simple, and various auxiliary devices such as an oscilloscope and a counter do not need to be used; the device is of a high integration degree, high accuracy, high measurement precision, full-automatic operation and the like; in this way, the overall measurement calibration and tracing on the multi-parameter physiological signal simulator are completely achieved.

The invention relates to an alternating current signal collection and automatic calibration method. Firstly, a CPLD is utilized for receiving square wave signals generated by collection and shaping of an alternating current collection module hardware frequency measurement loop, the CPLD carries out frequency tracking and calculation on the square wave signals, equally-spaced N pulse signals are output to a DSP in each period according to a measured frequency value, the frequency value is sent to the DSP, and the DSP completes N-point alternating current signal collection of each cycle; then the DSP uses pulse signals received from the CPLD as starting references of alternating current signal collection, the collection of all channel alternating current signals is finished in T/N, and N-point sampling of each alternating current signal is finished in the period T; and finally, automatic calibration is carried out on the collected alternating current signals. The method provided by the invention has the advantages that the collection capacity is large, the remote measurement precision is high, the calibration method is simple, and the expandability and the easy maintenance of the product are greatly improved.

A 3-D reconstruction method based on Taylor exponent expression surface structured light is provided, The method mainly comprises the following steps: generating and projecting a surface structure grating based on a special exponential expression, acquiring an image, and calculating the phase information of a projector-free gamma error contained in the acquired image based on a corresponding novelphase decomposition method. Thus, through the phase information of no projector gamma error, calculating the three-dimensional measurement result, and eliminating the effect of projector gamma on themeasurement result, and improving the measurement precision.

The invention provides a method and a device for retrieving an atmospheric water vapor content. Through acquiring BDS observation data and downloading ephemeris data IGU from an IGMAS, ephemeris datafor retrieving are acquired based on the ephemeris data IGU; based on the above information, coordinate information of an observation station is acquired, total tropospheric zenith delay above the observation station is acquired, and based on the coordinate information of the observation station and a saastamoinen model, zenith dry delay is calculated and acquired, and the zenith dry delay is subtracted from the total tropospheric zenith delay to obtain zenith wet delay; and according to a conversion coefficient, a liquid water density and the zenith wet delay, atmospheric precipitation is calculated. On the premise that the ephemeris data meet the precision requirements of retrieving the atmospheric water vapor content by the BDS, real-time retrieving of the atmospheric water vapor content by BDS observation can be realized, the atmospheric water vapor content measurement precision is improved, and the method and the device are applicable to conditions with a large altitude differencebetween the observation station and a reference station.

The invention discloses a measurement circuit and method for an insulation monitoring instrument fault circuit. The measurement method comprises the steps that firstly, a low-frequency square-wave pulse signal with the positive electrode and the negative electrode symmetrical is generated inside an insulation monitoring instrument; secondly, a measurement loop is formed through high negative voltage, a full ground plane and an insulation resistor Rf-dc; thirdly, a sample voltage is generated on a sampling resistor Rm through current in the measurement loop; fourthly, the sample voltage is sent to a built-in microprocessor for acquisition, and the numerical value of the insulation resistor Rf-dc can be obtained by conducting calculation according to the redundant binary algorithm. The measurement circuit and method for the insulation monitoring instrument fault circuit have the advantages the measurement precision is high, reliability is high, safety is high, and the circuit and method are suitable for different environments.

The invention discloses a magnetoelectric type absolute position sensor with a large central hole structure and a method for measuring an absolute position, relates to the field of robot control, and aims to solve the problems of complicated structure, large size, low measurement accuracy of the absolute position and low reliability of an existing position sensor. According to the magnetoelectric type absolute position sensor, a magnetic ring, a magnetic ring seat and a circuit board are of an annular structure; the magnetic ring is attached to the magnetic ring seat; the magnetic ring and the magnetic ring seat form a magnetic code disk; a gap is reserved between the magnetic code disk and the circuit board, and the magnetic code disk and the circuit board are coaxially and oppositely mounted; the circuit board is fixedly arranged on a stator shell; an outer ring main code channel and an inner ring cursor code channel are arranged on the upper surface of the magnetic ring respectively; an acquisition chip and a signal processing circuit are integrated on the circuit board; a Hall element is integrated in the acquisition chip and is used for acquiring the magnetic pole change information of the outer ring main code channel and the inner ring cursor code channel; magnetic field change information is processed by the signal processing circuit, and absolute position information is output. The magnetoelectric type absolute position sensor can be used for accurately measuring the rotating angle and the rotating speed of a light mechanical arm joint and controlling a motor.

The invention provides a laser radar transmitting system, and belongs to the technical field of laser radar systems. The laser radar transmitting system comprises a laser light source, a collimating optical device arranged on an emergent light path of the laser light source and used for forming a collimating light beam, an adjustable support used for fixedly installing the laser light source and the collimating optical device, a fixed support fixed on a laser radar shell and used for installing the adjustable support, and adjusting components used for adjusting a swing position of the adjustable support relative to the fixed support, wherein the adjustable support can swing in a direction perpendicular to the light path of the collimating light beam relative to the fixed support. Accordingto the laser radar transmitting system provided by the invention, the structural deviation caused by processing, assembly and device errors can be counteracted by adjusting an emission angle of the laser radar, the requirements of the system for the processing and assembly errors are met, and the measurement precision of the laser radar is effectively improved.

The invention discloses a blood pressure measurement method and system. The method comprises the following steps that a blood pressure measurement expression with correction factors is set according to the relationship between shear stress and the blood flow velocity V; characteristic parameters of the blood flow velocity V of a measured object are obtained, meanwhile the blood pressure reference value of the measured object is directly collected through a pressure gauge, and inverse calculation is conducted on the blood pressure measurement expression to obtain a correction factor value; when the practical blood pressure measurement is conducted, the correction factor value of the corresponding measured object is read from a database, and the blood pressure measuring result is calculated on the basis of the blood pressure measurement expression and the characteristic parameters, collected in real time, of the blood flow velocity. The blood pressure measurement method and system are simple, safe, convenient in test, and can achieve remote real-time monitoring of the blood pressure of the user, are good in real-time detection performance, can cope with various accidents of sudden illness of a blood-pressure-disease patient timely, eliminate the damage to the human body by a traditional direct measurement method, store the correction factors and characteristic constant values of the different measured objects for blood pressure calculation, and are high in measurement accuracy.

A sight distance visibility meter and a measuring method thereof can simulate light sensitivity of human normal vision truly to obtain atmospheric visibility distance directly and truly, and relate to the fields of real-time monitoring of agglomerate fogs in highways and atmospheric visibility distance measurement. The sight distance visibility meter comprises a target body, and an optical amplifier, a near infrared plane array CCD (charge coupled device) and an embedded signal processing unit which are connected sequentially, as well as a fog energy actuator arranged between the target body and the optical amplifier. Compared with the digital camera visibility distance measurement method, the method provided by the invention has the advantages of all-weather, high measurement accuracy, good stability, simple structure, small volume, low cost and the like due to the fact that the method does not needed a scene reference, is free from the affects of environmental factors like light and temperature in the atmospheric environment and acts no matter day and night, and the method is applicable for the real-time measurement of distance visibility and highway agglomerate fog monitoring needing intensive stationing.

In order to improve e.g. at a magnetostrictive position sensor the measurement precision and the robustness of the time measurement in spite of low installation size and cost, it is suggested according to the invention to generate a digital position impulse with defined time width from the analog position impulse so, that the middle of the digital impulse is located at the middle of the analog impulse and the time interval can be determined as time differential between the start impulse and the middle of the digital impulse.

The invention discloses a stereo matching method based on cost aggregation, and the method comprises the steps: building a measurement system which comprises an installation plate, and a stereo visionmodule and a digital speckle projection module which are slidingly disposed on the installation plate; performing calibration and image correction on two industrial cameras in the stereoscopic visionmodule; forming digital speckles through a digital speckle projection module and projecting the digital speckles to the surface of the measured object; shooting an image with digital speckle texturesthrough the stereoscopic vision module and preprocessed, and then carrying out stereoscopic matching calculation, so as to obtain three-dimensional data information of a measured object. The method can adapt to measured objects with different sizes, improves the measurement precision of the measured object without texture or with weak texture, is not liable to be affected by ambient light, achieves the shape measurement, is good in stability, and is higher in adaptability.

The present invention discloses a floor lifting horizontal bit gauge. The bit gauge comprises a housing, an inner plate and a handle, and an adjustment lever and a dimension bar which are arranged at the surface of the housing. Three or four uniformly distributed annular telescoping rods are fixedly connected at the lower surface of the housing, and a level meter is installed at the upper surface of the housing. The objective of the invention is to provide a floor lifting horizontal bit gauge, the problems are solved that a bit gauge is used through human holding and it is difficult to make the bit gauge level in the prior art, so that the measurement precision of the bit gauge is improved.

The invention belongs to the technical field of flow measurement, and particularly relates to a multiphase flow online real-time metering artificial intelligence model construction method. Oil-gas-water multiphase flow physical property parameters are various, and the flow process is complex, so that the development of a real-time flow measurement technology in an oil-gas production process is seriously restricted. The invention provides a multiphase flow online real-time metering artificial intelligence model construction method. The method comprises the steps of adopting Venturi measurementequipment, an electrical tomography sensor and a microwave sensor to cooperatively measure signals; by means of a deep encoding-decoding mode, under the condition that a large number of real flow sample tags do not exist, fully utilizing a large number of flow-tag-free measurement signals, and extracting the most basic constituent unit signals in the measurement signals; and constructing an artificial intelligence identification model of the flow of the measurement signal, the gas phase, the oil phase and the water phase according to the extracted minimum measurement signal forming unit. And meanwhile, the label-free measurement signal is fully utilized, so that higher measurement precision is realized.

The invention relates to a method, a device and a system for measuring a mechanical beam rigidity of a capacitive MEMS (Micro-Electro-Mechanical System) accelerometer. The method comprises: applying apreload voltage to the accelerometer, wherein the preload voltage comprises a first preload voltage and a second preload voltage; acquiring a first voltage change amount output by the accelerometer at the first preload voltage when the acceleration experienced by the accelerometer changes, and acquiring a second voltage change amount output by the accelerometer at the second preload voltage whenthe acceleration experienced by the accelerometer changes; and obtaining the mechanical beam rigidity of the accelerometer according to a first electrostatic negative rigidity of the first preload voltage, a second electrostatic negative rigidity of the second preload voltage, the first voltage change amount and the second voltage change amount. According to the method, the device and the system for measuring the mechanical beam rigidity of the capacitive MEMS accelerometer, the influence of the parameters, of the traditional measuring technology, such as displacement capacitance conversion coefficient, inertial mass block quality, etc., on the measurement precision when measuring the mechanical beam rigidity can be avoided, so that the measurement precision of the mechanical beam rigidityof the accelerometer is improved.

The present invention relates to photoelectric-technology-based construction engineering surveying equipment comprising a housing, a signal processing module, an electronic compensation module and a battery, the signal processing module, the an electronic compensation module and the battery are located inside the housing, and the housing is provided with a lifting handle, a self-aligned telescope, a measuring regulating device, an input-output device and a base. The photoelectric-technology-based construction engineering surveying equipment has the advantages of simple structure, easy operation, high sensitivity, high measurement precision, and the like, can timely calculate, display and store data, greatly simplifies the process of a worker, and improves work efficiency.

The invention relates to the field of shock wave measurement methods and techniques, specifically to a comparison-type calibration method for shock wave measurement. The comparison-type calibration method comprises the following steps of: 1) clamping ballistic rifles with different calibers on a fixed shooting platform; 2) placing a calibrated noise measurement system and a shock wave measurement system to be calibrated at equal distance respectively from left and right sides of the ballistic rifles in the shooting direction; 3) conducting shooting via the ballistic rifles with different calibers, and simultaneously acquiring, in real time, shock waves generated by the calibrated noise measurement system and the shock wave measurement system to be calibrated during the ball firing; 4) performing statistics of acquired mass data, and figuring out a linear regression equation about a noise peak and a shock wave peak; and 5) correcting, by using the linear regression equation in the step (4), the shock wave pressure peak acquired after the measurement. The comparison-type calibration method of the invention comprehensively improves the shock wave measurement precision and solves the problem that there is no way to carry out field calibration for shock wave measurement.

The invention discloses a sensor base for reducing the stress of a shell on a chip, and belongs to the technical field of sensors. The sensor base comprises a shell, and an oil filling cavity is formed in the bottom of the shell. A group of terminal pins penetrating through the oil filling shell is arranged along the axial circumference of the shell at the upper end of the oil filling cavity. First glass insulators are arranged outside the terminal pins. A mounting cavity is further formed at the upper end of the oil filling cavity. A kovar tube is fixedly arranged in the middle of the top ofthe mounting cavity. A second glass insulator is sintered outside the kovar tube. A first air guide hole is formed in the upper end of the kovar tube. The kovar tube and the second glass insulator arefirmly sealed by sintering, so that the shell is separated from a sensor chip fixed at the bottom of the kovar tube, and the independence of the position of the sensor chip is improved. Therefore, the stress of the shell on the sensor chip is isolated, the interference of the stress on the precision of the sensor is reduced, and the measurement precision of the sensor is improved.

The invention discloses a broadband spectrum shaping device which comprises a plurality of asymmetric Mach-Zehnder interferometers which are connected in series and have different shaping parameters. The asymmetric Mach-Zehnder interferometer is provided with two interference arms with different arm lengths; the shaping parameter is an arm length difference and/or a coupler light splitting coefficient. The invention further discloses a calculation type spectral measurement device. The broadband spectrum shaping device is based on a common waveguide structure, does not need higher process precision like a grating or a photonic crystal device, does not introduce additional scattering loss, is easy to design, does not need higher processing precision, and has larger working bandwidth and higher precision. According to the calculation type spectrum measurement device, the input spectrum can be reconstructed with high precision through single measurement, due to the fact that the broadband spectrum shaping device is adopted, the manufacturing difficulty and the manufacturing cost are greatly reduced, meanwhile, the measurement precision is effectively improved, and the practicability of the calculation type spectrum measurement device is far better than that of an existing calculation type spectrograph.