43 results about "Accuracy and precision" patented technology

The invention discloses different system measuring method and equipment. The method comprises the following steps: a network side informs the up and down conversion information of a terminal different system neighbor cell and/or the network side informs whether the terminal different system neighbor cell is synchronous with the cell; a terminal acquires the data of a time slot or subframe to be measured in a different system according to the up and down conversion configuration information; and measurement is carried out and/or the terminal determines whether synchronous search is required when a neighbor cell is measured according to the synchronous condition of the different system neighbor cell. The invention can reduce the calculation amount of terminal measurement, decrease complexity and improve measuring speed and accuracy when the terminal carries out different system neighbor cell measurement, and also can avoid blindness on operating the terminal.

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 discloses a suspended adsorption type automatic adhering device for indicating gratings, relates to the field of a grating ruler manufacturing process, and solves the problems of poor adhesive consistency, low yield and low measurement accuracy because the three-dimensional adjustment amount of the indicating gratings, the pressing force of carriages and the contractibility of glue water cannot be accurately controlled in the manual adhering process of the indicating grating in the conventional fixed-position adhering device for the indicating gratings. The device comprises a substrate, a hollow turntable, an electric rotating platform, a grating pickup assembly, a carriage positioning assembly, an adhesive dispensing and curing assembly, a two-gear zoom lens, an adjusting seat, and a suspended adsorption structure which is fixed on a third turntable of the electric rotating platform and is used for adsorbing the indicating grating, wherein the electric rotating platform, the grating pickup assembly, the carriage positioning assembly, the adhesive dispensing and curing assembly, the two-gear zoom lens and the adjusting seat are arranged in the hollow turntable and are fixed on the substrate; the indicating grating pickup assembly and the carriage positioning assembly are respectively positioned on two sides of the electric rotating platform; a plurality of indicating gratings and a plurality of carriages are uniformly distributed on the inner and outer circumferences of the hollow turntable respectively. The adhesive accuracy, the measurement accuracy and the yield are improved through full-automatic adhesion, and the adhesive consistency is better.

The invention provides a monitoring method of the internal stress of a spacecraft composite material structure in an aging process. The method includes following steps: step1, placing carbon fiber prepreg, a special optical fiber, carbon fiber prepreg, demolding cloth, and adhesive-absorbing felt on a molding mold of the spacecraft composite material structure in sequence, and performing integral sealing by employing a vacuum bag; step 2, performing curing by employing an autoclave process, performing demolding after cooling, and obtaining the spacecraft composite material structure implanted with the special optical fiber at the inner part; and step 3, placing the spacecraft composite material structure in a clean factory building, and performing aging treatment on the spacecraft composite material structure by employing a natural aging method. According to the method, based on a back Rayleigh scattering principle, the special optical fiber is implanted in the spacecraft composite material structure, the monitoring of the internal stress in the aging process is realized by employing an optical frequency domain reflection technology, the spatial resolution is high, the measuring precision is high, the repeatability is good, and basis is laid for improvement of the aging method of the spacecraft composite material structure and the improvement of the dimension stability.

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 discloses a testing method for the step response performance of a phase-locked loop system, aiming at improving the testing precision of the step response performance. The testing method comprises the steps as follows: during the process that the phase-locked loop system steps from one stable oscillating frequency to another oscillating frequency, the waveform of an output voltage signal is recorded; the frequency information of the output voltage signal during the stepping process is obtained according to the waveform; and parameters of the step response performance are obtained according to the frequency information. The invention avoids leading testing parameters from a feedback loop, can not lead noise to an original system and improves the measuring precision.

The invention discloses an actual ship measurement system and an actual ship measurement method for fuel consumption rate of a fishing boat. The actual ship measurement system comprises a day tank, a fuel measurement barrel, a fishing boat engine and an integrated control unit, wherein the day tank and the fuel measurement barrel are connected with the fishing boat engine through a three-way valve so as to supply fuel; the feeding amount of fuel supplied by the fuel measurement barrel to the fishing boat engine and the fuel density are measured through a flowmeter and an electronic densimeter; the flowmeter is used for measuring the fuel return amount of the fishing boat engine; the integrated control unit displays measurement data and calculates the fuel consumption rate of the fishing boat engine. The actual ship measurement system is simple in structure, convenient to assemble and disassemble and reasonable in design; the measurement data are accurate, the automation degree is high, and a measurement result is precise; various defects and shortcomings of inconvenience in use and operation, influence caused by environment factors, low measurement accuracy and precision, poor use effect and the like of the conventional actual ship measurement system for the fuel consumption of the fishing boat are effectively overcome.

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 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 provides an emission spectrum background correction method, which includes the following steps: a blank background spectrogram, which includes m spectrogram data, is acquired; a sample spectrogram with continuous background interference, which includes m spectrogram data corresponding to the spectrogram data of the blank background spectrogram, is acquired; n sample background spectrum data are screened from the sample spectrogram, n corresponding data are screened from the blank background spectrogram to serve as blank background spectrum data for correction, m is greater than or equal to n, and m and n are positive integers; according to the sample background spectrum data and the blank background spectrum data for correction, fitting is carried out, so that a correction relation is obtained; the blank background spectrogram is inputted into the correction relation to carry out correction, so that an estimated background of a sample is obtained; the estimated background is subtracted from the sample spectrogram, and thereby a clean signal spectrogram is obtained. By sampling and fitting background spectrogram intensity, the method obtains the correction relation to correct the background spectrogram, and after the corrected background spectrogram is subtracted, the measuring precision of the obtained signal spectrogram is greatly increased.

The invention discloses an analyzing method for quickly and precisely measuring tellurium in a tellurium smelting process. The measuring range of the tellurium in material is 20-95% of mass percent. The analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process mainly includes steps that weighing a certain amount of sample, adding a proper amount of hydrochloric acid, nitric acid and sulfuric acid dissolving sample, adding bromine water to shield As and Sb interference, and using ammonium ferrous sulfate to titrate the tellurium content under a proper amount of potassium dichromate and thiophosphate. The analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process uses standard addition test and parallel test to verify the accuracy and precision of the method; the analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process is high in precision and capable of meeting the actual needs of the analysis and detection for the tellurium content in the material in the tellurium production process.

The invention provides a bearing bush performance testing machine and a testing method. The bearing bush performance testing machine comprises a mechanical system, a hydraulic loading system, a lubricating system, a signal testing system and a control system; the mechanical system comprises a test main shaft (7), a main shaft rotating device, a test bearing bush (11), a test load loading device and an inclination angle loading device, wherein the test main shaft (7) is arranged on the main shaft rotating device; the test bearing bush (11) is installed on the test load loading device; the testmain shaft (7) and the test bearing bush (11) form a rotary friction pair; the inclination angle loading device can enable the test bearing bush (11) to be inclined relative to the test main shaft (7); the hydraulic loading system can be used for performing upward loading on the test bearing bush (11); and the lubricating system can lubricate the test bearing bush (11). The use performance of thebearing bush under different axis inclination angles can be accurately tested, the operation is simple, and the measuring precision is high.

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.

The invention provides an online alternating-current flow proportion regulation control device and belongs to the technical field of alternating-current hydraulics. The control device is characterized by comprising a crank, a slider, a connecting rod, a lever, a ball screw, a ball nut, a servo motor, a hydraulic cylinder and the like. The crank in a crank-connecting rod mechanism drives the slider to move through the connecting rod according to the sine rule, and sine rule change is transmitted to a piston of the hydraulic cylinder after being magnified/shrunk by certain times by a lever system composed of the lever, a lever bearing and the like. The piston enables the output end of the hydraulic cylinder to accurately output set alternating-current flow according to the sine rule change magnified/shrunk by certain times, so that real-time dynamic on-line accurate linear proportion regulation of the alternating-current flow is realized. The control device has the advantages that the device is smart in structure, reasonable in layout and high in measurement accuracy, the problem that the alternating-current flow cannot be regulated proportionally online with high precision by traditional crank length changing methods and the like is solved, and good promotional value is obtained.

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.

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 discloses a method for measuring parameters of a coherent optical receiver based on frequency shift modulation. The method comprises the following steps: dividing optical carrier into two paths, performing optical frequency shift modulation on one path, and inputting an obtained frequency shift modulation signal and the other path of optical carrier into two input ports of the coherent optical receiver; and for each path of output channel of the coherent optical receiver, extracting amplitude and phase information of an output signal respectively, and getting amplitude response and phase response of each path of output channel of the coherent optical receiver under the wavelength of the optical carrier in conjunction with the frequency shift modulation signal and the amplitude of the other path of optical carrier. The invention also discloses a device for measuring parameters of the coherent optical receiver based on frequency shift modulation. Compared with the prior art, the method and the device have the advantages that the measuring range can be expanded greatly, and the measuring accuracy and measuring efficiency are increased.