28 results about "Measurement repeatability" patented technology

The invention discloses a size laser measurement device and method for metal plugging slide block processing, and relates to the technical field of laser measurement. The size laser measurement device and method for metal plugging sliding block processing comprise a measurement table, a guide rail and a sliding seat which are installed on the measurement table and used for clamping and placing a metal plugging sliding block to be measured, an electric telescopic rod, a supporting piece, a guide plate and a clamp, and the measurement table is provided with a measurement assembly used for measuring the size of the metal plugging sliding block. The measuring assembly comprises a three-dimensional laser scanner which is located above the measuring table and can carry out circumferential movement to carry out annular scanning on the metal plugging sliding block so as to measure the size; the three problems of reflection interference, blind area shielding and flow complexity in online measurement of the high-reflection metal part are effectively solved, the uniformity of repeatability and function correlation is improved, and the measurement repeatability is changed from depending on physical placement consistency to depending on data reference consistency.

This invention discloses a method, apparatus, device, and storage medium for measuring repeatability using a corneal topography instrument. The method includes the following steps: performing multiple independent and repeated measurements on the same test surface using a corneal topography instrument to obtain multiple sets of corneal topography data; calculating the single-point standard deviation of each measurement point within the measurement area based on the multiple sets of corneal topography data to characterize the single-point repeatability of each measurement point; assigning an area weight value representing its spatial representativeness to each measurement point; and performing a weighted calculation based on the single-point standard deviation of each measurement point and its corresponding area weight value to obtain the overall measurement repeatability index of the corneal topography instrument. This invention overcomes the shortcomings of existing technologies that use the maximum single-point standard deviation to characterize repeatability, which is susceptible to gross errors, and provides a more comprehensive and objective repeatability evaluation scheme.

A contact type displacement sensor with high stability and accuracy comprises a probe assembly and an outer shell, and a grating code ruler assembly, a linear motion guide assembly and a PCBA circuit board are arranged in the outer shell. The grating code ruler assembly comprises grating glass and a grating support. The grating glass is installed on the grating support, and a plurality of transparent lines and opaque lines are formed on the grating glass. In conclusion, the pin is adopted to replace traditional threaded connection to achieve rigid positioning of the grating code ruler assembly, accumulative errors caused by assembly gaps and vibration are effectively eliminated, and the movement stability and the measurement repeatability are remarkably improved by combining a low-friction matching structure of the guide sliding groove and the pin; according to the overall structure, the assembly process is simplified, the abrasion risk of long-term use is reduced, high-stability and high-precision continuous displacement detection can be achieved in a complex industrial environment, and the strict requirement for measurement reliability in the precision manufacturing field is met.

The application relates to the technical field of free-tryout die technology, and discloses a free-tryout die for a wind power blade manufacturing process and a die closing method, which adopts a measuring device to form repeatable measurement, has good measurement precision, omits the tryout die process during measurement, has high measurement efficiency, good measurement repeatability, and further improved practicality, and comprises a die reference base device, a measuring device and a data collection and calculation system, wherein the die reference base device comprises a fixed bottom die base and an opening and closing top die base, the fixed bottom die base and the opening and closing top die base are rotationally connected with each other, an opening and closing die driving assembly is arranged between the fixed bottom die base and the opening and closing top die base, the fixed bottom die base and the opening and closing top die base are respectively provided with SS-face die cavities and PS-face die cavities, the measuring device comprises a movable support, the movable support is slidably connected with the fixed bottom die base, an electric telescopic rod is arranged on the fixed bottom die base, and the telescopic rod of the electric telescopic rod is connected with the movable support.

Disclosed is a method for testing and / or operating a roll-to-roll machine comprising a floating unwinder and an edge position sensor attached thereto, and a floating rewinder with an edge position sensor attached thereto.

This invention discloses an integrated active spectral stabilization system and method for a desktop high-resolution X-ray emission spectrometer, belonging to the field of precision spectral analysis. The system includes: a single-unit thermal capacity main base with an integrated temperature-controlled flow channel, serving as a unified physical and thermal reference; optical components rigidly mounted directly on the base; a module supporting active vibration isolation of the base; and a closed-loop feedback subsystem consisting of a beam position sensor, a micro-motion compensation mechanism, and a controller. The method includes: establishing global thermal balance and active vibration isolation of the base; calibrating the optical path and recording the null position; real-time monitoring of the reference beam position; and dynamically locking the optical path by using a closed-loop drive micro-motion mechanism to compensate for the crystal angle based on the drift amount. This invention solves the long-term drift problem caused by modular assembly and passive stabilization in desktop high-resolution X-ray spectrometers, achieving long-term subelectron volt-level energy stability under conventional laboratory conditions, significantly improving measurement repeatability and reliability.

The utility model discloses a bearing play measuring mechanism, its through the original structure of rotary power unit integrated push rod drive stator connecting foot, combines the three point graduation measurement algorithm of opposite clamping measurement unit, completely subverts traditional manual detection mode. The detection time is greatly shortened, and the measuring efficiency is improved, and the high -speed production line rhythm is directly matched, and the measurement repeatability precision of opposite clamping measurement unit is high, and the micron level play change is captured accurately, and the equipment utilizes the stator shell original connecting foot as the driving fulcrum, saves the special rotary clamp and makes the manufacturing cost reduce, and the maintenance -free design can reduce the downtime loss, provides high reliable, low -cost, full -automatic quality guarantee foundation for motor intelligent manufacturing.

The invention discloses a subspace joint parameter estimation algorithm for constructing an analytic signal based on Hilbert transform in high-precision multi-surface phase-shift interference, belongs to the technical field of high-precision optical interference measurement, and aims to solve the problems of inaccurate frequency estimation caused by spectrum leakage and a fence effect in a traditional algorithm. And the problem that a modern spectrum estimation algorithm cannot directly process real-value light intensity signals is solved. The method comprises the following steps: firstly, performing Hilbert transform on a real-value light intensity sequence to construct an analysis signal; then, a Hankel matrix is constructed based on the analysis signal, and subspace decomposition is carried out; further, taking the obtained high-precision frequency as prior information, and performing joint correction on the amplitude and the phase by using a double-section phase difference correction method; and finally, reconstructing the surface topography according to the corrected phase. According to the invention, the limitation of spectrum leakage and the like is overcome, the joint fine positioning of frequency, amplitude and phase is realized, and the precision, robustness and measurement repeatability of interference parameter demodulation are obviously improved.

The application discloses a kind of multi-point thermal field adaptive temperature control methods for oil water cut calibration, it is related to thermal field temperature control technical field, for solving the problem that measurement result is difficult to keep measurement repeatability, by the temperature data of different height positions of the sample to be measured under controlled temperature rise condition acquisition, based on temperature gradient feature recognition oil phase, emulsification zone and the temperature stratification interface formed by water phase, and interface upper and lower boundary is used as section division basis, calculate temperature rise lag index, analyze emulsion thickness variation, obtain interface sedimentation rate, based on temperature rise lag index and interface sedimentation rate construct stratified emulsification coefficient, for determining sample emulsification state and water cut error deviation direction, and generate water cut correction coefficient, by stepper motor to the quantitative discharge of stratified section Directional compensation is carried out, and calibration reference is obtained in combination with section, to improve the measurement accuracy under the condition of oil-water interface instability.

This application provides a five-axis measurement and evaluation method for wheel-type tenon grooves, relating to the field of wheel-type tenon groove measurement technology. After the wheel is clamped, a wheel coordinate system is established. Based on the nominal position and orientation of the tenon groove, a nominal coordinate system for the tenon groove is established, and correction measurement points are collected on the working surface to be measured. The initial coordinate system of the tenon groove is obtained by correcting it according to the least squares criterion. A high-density point cloud is obtained by five-axis oscillation scanning and fitted to the actual working surface. The nominal corner points are projected onto the actual working surface to obtain the measured corner points. The coordinate system is corrected using the least squares method for corner point deviation. The oscillation-fitting-correction process is iterated until the change in coordinate system between two adjacent iterations is less than 10% of the tolerance bandwidth, thus obtaining the measured coordinate system of the tenon groove. Geometric tolerances such as center point position, axial / radial tilt, and angle are calculated in the wheel coordinate system to complete the machining quality evaluation. This method reduces the accumulated error of the reference structure and improves the accessibility and measurement repeatability of oblique tenons.

The application discloses a gravity and gravity gradient integrated measuring device and method based on atomic interference, and the measuring device comprises a Raman laser emitter and a structural framework. Raman laser emitted by the Raman laser emitter passes through an upper atomic interferometer and a lower atomic interferometer in sequence and then is vertically incident on a Raman laser reflector. The bottom of the Raman laser reflector is fixedly connected with the top of a seismometer through an adapter, and the structural framework is installed on a rotating platform. The measuring method comprises the following steps: firstly, the orientation angles corresponding to the maximum value and the minimum value of the gravity gradient are determined; at a new measuring point, the orientation angle of the measuring device is adjusted to the orientation angles corresponding to the maximum value and the minimum value of the gravity gradient; the original gravity measurement value of the upper atomic interferometer, the original gravity measurement value of the lower atomic interferometer and the original measurement value of the gravity gradient are obtained and corrected. The measuring repeatability problem caused by the Coriolis error in the measuring process is effectively solved.

The invention discloses an integral active spectrum stabilization system and method of a desktop high-resolution X-ray emission spectrometer, and belongs to the field of precise spectrum analysis. The system comprises a single heat capacity main base which is integrally formed and internally provided with a temperature control flow channel and serves as a unified physical and thermal reference; an optical assembly directly rigidly mounted on the base; the module is used for supporting the base to actively isolate vibration; and the closed-loop feedback subsystem consists of a light beam position sensor, a micro-motion compensation mechanism and a controller. The method comprises the steps that base global heat balance and active vibration isolation are established; calibrating a light path and recording a zero position; monitoring the position of the reference beam in real time; and a micro-motion mechanism is driven to compensate the crystal angle according to the drift distance in a closed-loop manner, and a light path is dynamically locked. According to the invention, the problem of long-term drift of the desktop high-resolution X-ray spectrometer caused by module assembly and passive stability is solved, sub-electron volt-level long-term energy stability in a conventional laboratory environment is realized, and the measurement repeatability and reliability are remarkably improved.

A protective member (126) for an optical measuring device, such as a broken beam tool setting device (2) for a machine tool, is described. The protective member (126) comprises a duct (140) through which light and air can pass. The duct (140) is configured such that, in use, a light beam passes through the duct along an optical axis (O) and an air flow is directed out of the duct along an airflow axis (A). The optical axis (O) is not parallel to the airflow axis (A), and the duct (140) has a varying cross-sectional profile along the airflow axis (A). Improved measurement repeatability is provided.

The invention discloses a high-precision hydrogen sulfide analysis and detection tube, a high-precision hydrogen sulfide analysis and detection device and a high-precision hydrogen sulfide analysis and detection method, and relates to the technical field of natural gas sampling and analysis, the high-precision hydrogen sulfide analysis and detection tube comprises a detection tube body, a plurality of capillary tubes are arranged in the detection tube body, and each capillary tube adopts a silicide coating and is filled with micron-sized HgCl2 impregnated silica gel. The amount of substance and molar mass of hydrogen sulfide are measured according to the color-changing length of the detection tube body, and the concentration of a to-be-measured component is measured according to the volume and mass, so that the problems of wide and fuzzy color-changing interface, no pressure resistance, fragility, poor suction sample introduction measurement precision and the like caused by adsorption and large inner diameter in the existing detection tube method for measuring hydrogen sulfide in natural gas are solved; and the measurement repeatability and accuracy are improved.

The application relates to a turbine flow sensor test analysis method and device, an intelligent flow measurement device, a computer device, a storage medium and a computer program product. The method comprises the following steps: obtaining instrument coefficients measured by a turbine flow sensor at different caliber water flow standard devices; calculating average instrument coefficients of the turbine flow sensor at different caliber water flow standard devices at the same flow point; calculating measurement repeatability and average instrument coefficients at corresponding flow points; calculating comparison control values at each measurement point according to the average instrument coefficients of the turbine flow sensor at different flow points; and analyzing the performance of the turbine flow sensor according to the values. The turbine flow sensor can be accurately tested and analyzed.

The invention relates to the technical field of high-voltage direct-current transmission equipment monitoring, and discloses a high-voltage direct-current converter valve cooling system pressure sensor lifting device and method.The method includes the steps that a gradient stress ring and an electric field shielding cover are arranged, and the fringe effect is restrained from the physical level; after field installation, pre-pressurizing processing is carried out to optimize a pressure conduction path, and a two-step data compensation algorithm is adopted: an original digital signal is corrected by using a nonlinear edge effect compensation model established based on a maximum deviation feature point; a precise pressure value is calculated through a linear basic relation model, a compensation coefficient self-adaptive updating mechanism is further included, through periodic field calibration, coefficients of an edge effect compensation model are only pertinently updated when the measurement deviation exceeds the limit, and therefore precise compensation is conducted on long-term drift on the premise that the basic characteristics of the sensor are not changed. According to the invention, physical suppression is combined with an adaptive algorithm, so that the full-period service measurement repeatability and environmental adaptability of the sensor are improved.

The application discloses a kind of round runout detection devices of shaft, including shaft body support, shaft body support, height adjusting mechanism and dial gauge;The shaft body support has two, is connected installation rail respectively, shaft body support is installed on each, one of the shaft body support side is equipped with driving motor;The shaft body support is symmetrically provided with a pair of support rollers along center line, and the two ends are matched with the shaft body support;Positioning sliding block is connected on the installation rail, and the top is installed dial gauge;The height adjusting mechanism is arranged between two shaft body supports, and the top surface is respectively connected with two shaft body supports.The height-adjustable shaft body support of the present application cooperates with the height adjusting mechanism, solves the problem that the traditional device is difficult to adapt to different diameter shaft parts, improves the convenience of clamping and measurement repeatability;Dial gauge is flexibly moved on installation rail by positioning sliding block, realizes multi-point, arbitrary position detection along axis, overcomes the defects of single measurement point and limited coverage of traditional fixed dial gauge.

The application belongs to the technical field of neutron scattering, and particularly relates to a dynamic range improvement and background suppression integrated collimation / beam blocking device and method. Through integrated collimation and multi-stage beam blocking collaborative design, the parasitic background caused by Fresnel diffraction and edge scattering is reduced. Through a closed-loop tracking compensation mechanism, the beam center deviation caused by thermal drift and mechanical drift is reduced, the low-q region artifact risk is reduced. Through the replaceable absorber cassette, multi-working-condition quick switching is realized, the high-throughput and high-dynamic-range measurement requirements are considered, through the sample environment module local shielding and opening angle collaborative optimization, the additional scattering introduced by extreme environments such as high temperature and high pressure is reduced, through the dynamic mask reconstruction process, the effective data retention rate in the low-q region is improved and the measurement repeatability is improved. It simultaneously realizes that the background in the low-q region is significantly reduced, the baseline stability is improved, the beam blocking coaxial relationship can still be maintained under the condition of slow beam drift, and the error of the reconstruction system is reduced.

The application discloses a current probe with a flexible pre-contact structure and a contact force control method thereof, and the current probe comprises a tubular shell, a measurement probe head, a flexible pre-contact structure and a driving control module, the flexible pre-contact structure comprises a flexible contact head, a sliding sleeve, a force spring and a force sensing module, and is used for flexibly contacting a measured point and sensing a contact force in real time before the measurement probe head contacts; the driving control module comprises a micro driver and a control unit, the driving control module calculates an accurate displacement amount required for the measurement probe head to extend in real time according to the sensed contact force data through a calculation model, and drives the micro driver to execute the displacement, so that the measurement probe head contacts the measured point with constant and tiny optimal pressure, and the application effectively solves the technical problems that a traditional contact probe is easy to damage a fragile measured point, the contact resistance is unstable, and the measurement repeatability is poor through the probe contact process of sensing first and contacting later.

The invention discloses a multi-point thermal field adaptive temperature control method for petroleum moisture content calibration, relates to the technical field of thermal field temperature control, and is used for solving the problem that a measurement result is difficult to keep measurement repeatability. The method comprises the following steps: identifying a temperature stratified interface formed by an oil phase, an emulsification zone and a water phase based on temperature gradient characteristics, taking upper and lower boundaries of the interface as a section division basis, calculating a temperature rise lag index, analyzing an emulsification thickness change to obtain an interface sedimentation rate, and constructing a stratified emulsification coefficient based on the temperature rise lag index and the interface sedimentation rate; the method is used for judging the emulsification state of a sample and the error deviation direction of the water content, generating a water content correction coefficient, performing directional compensation on the quantitative discharge amount of a layered section through a stepping motor, obtaining a water content calibration result in combination with a section calibration reference, and improving the measurement accuracy under the condition that the oil-water interface is unstable.

The invention discloses a device for measuring the diameter of an inner cavity channel and a light attenuation measuring system and method, and relates to the technical field of medical instruments. By arranging the guide assembly, the balloon assembly and the optical fiber assembly, high-precision measurement of the diameter of the inner cavity is achieved. The optical fiber assembly is integrated in the balloon body, probe light emission and return light receiving are carried out on the inner wall face of the balloon through the optical sensing port, the size information of the inner wall of a measured cavity can be indirectly reflected in combination with the deformation characteristic of the balloon body in the inflation state, and the balloon has the advantages of being compact in structure, rapid in response and good in measurement repeatability; the device is suitable for real-time and multi-point measurement of the diameter of the inner cavity in a minimally invasive intervention environment.

The invention discloses a detection tube capable of simultaneously detecting hydrogen sulfide and carbon dioxide and a detection method. The detection tube comprises a pressure-resistant detection tube body, two color sensors and a flow meter, the pressure-resistant detection tube body comprises a transparent pressure-resistant tube and a detection tube coaxially mounted in the transparent pressure-resistant tube, and a gap is formed between the outer wall of the detection tube and the inner wall of the transparent pressure-resistant tube to form a pressure-resistant cavity; the front end in the detection tube body is filled with Pb (CH3COO) 2 impregnated silica gel, and the rear end in the detection tube body is filled with NaOH impregnated silica gel; a Pb (CH3COO) 2 impregnated silicone tube section and a NaOH impregnated silicone tube section outside the pressure resistance detection tube body are respectively provided with a color sensor; the color sensor is electrically connected with the flow meter, and the flow meter is arranged at a tail end outlet of the pressure resistance detection pipe body. The problems that hydrogen sulfide and carbon dioxide in natural gas are independently measured by an existing detection tube method, measurement interference exists, a color changing interface is wide and fuzzy due to the large inner diameter, the device is not resistant to pressure and fragile, and suction sample injection measurement precision is poor are solved, and measurement repeatability, accuracy and detection efficiency are improved.

This invention relates to a target for aligning a geodetic scanner and a laser tracker, and its method of use. The target includes a disc, a conical cover, and a reflective sphere. Two intersecting first dividing lines passing through the center of the disc separate black and white blocks. A conical notch is formed at the center of the disc, and the conical cover is detachably fitted into the notch, with its end face forming a complete disc surface. The reflective sphere is detachably engaged within the notch, and the reflective sphere and the conical cover are used in a staggered manner. When the reflective sphere is engaged within the notch, its center coincides with the center of the disc surface. The target center point can be obtained simply by removing the conical cover and measuring the center point of the reflective sphere, which is convenient and quick. The measurement repeatability is high, and the center error is better than 0.08 mm compared to the tracker's measurement error.

The application provides a negative temperature coefficient thermistor thermal time constant measurement system and method, the system comprises: a temperature environment unit, a motion control unit, a data acquisition unit, and a data processing unit deployed on a host computer; the temperature environment unit is used for providing temperature environment A area and B area with different environmental temperatures respectively; the motion control unit is used for accurately controlling the negative temperature coefficient thermistor to be measured to move from the temperature environment A area to the B area; the data acquisition unit is used for measuring the resistance value of the negative temperature coefficient thermistor to be measured in real time and transmitting to the host computer; the data processing unit is used for determining the corresponding temperature value according to the pre-established resistance value R-temperature value T equation, combining the temperature values of the temperature environment A area and the B area, and obtaining the thermal time constant. The application has good measurement repeatability, small measurement error and simple operation process, and significantly improves the test result reliability and test efficiency.

The invention discloses a black lens chromatic aberration detection device and method based on hyperspectrum, and relates to the field of black lens chromatic aberration detection, and the device comprises a support frame, a hyperspectral camera, an annular light source, a laser range finder, a lens jig, a driving motor and a main control board. The method comprises the steps of initializing a system and collecting a dark background; fixing the lens and the low-signal-value standard white board; driving the jig to move and synchronously acquiring multi-exposure spectrum data and distance data; carrying out dark background deduction and distance light source compensation; synthesizing the multi-exposure data into high-quality fusion spectrum data through an intelligent fusion algorithm; calculating the relative reflectivity of the to-be-measured lens based on the fusion data and the known reflectivity of the standard white board; and finally converting the CIELAB chromatic value into a CIELAB chromatic value and outputting a result. Through multi-exposure fusion and distance compensation, the problems of weak signals, large noise interference, poor measurement repeatability and the like caused by low reflectivity of a black lens are effectively solved, and automatic detection of chromatic aberration parameters is realized.

The invention belongs to the technical field of optical measurement, and particularly relates to a non-coaxial system eccentricity measuring device and method. According to the device, the measuring tool base and the eccentricity meter base form point contact, interference of the measuring tool bottom surface to core shift detection is eliminated, the accuracy of a detection reference axis of a to-be-detected non-coaxial system is ensured all the time, and the design requirement of the non-coaxial system is met; the compensation block can be matched with an asymmetric or folded non-coaxial system structure to be measured, so that the installation stability of the system to be measured is ensured, and the measurement repeatability is improved; the positioning adjusting mechanism and the rotary transmission mechanism are combined to realize height coincidence of the detection reference axis of the to-be-detected system, and the eccentricity of each optical surface of the to-be-detected system relative to the detection reference axis can be quickly obtained by matching with the automatic eccentricity detection function of the eccentric instrument.

The application discloses a kind of boron neutron capture therapy beam gamma dose measurement methods, it is related to radiotherapy technical field, first thermoluminescence dosimeter is standardized annealing pretreatment, and screening, numbering;Positioning and calibration are carried out to water equivalent phantom fixed on treatment bed, complete reference positioning;Thermoluminescence dosimeter is loaded in water equivalent phantom and is irradiated again;After irradiation, take out phantom, establish the one-to-one correspondence between unique number and its three-dimensional space position in phantom, and record;First measurement and second measurement are carried out to all dosimeters in turn, calculate thermoluminescence net gamma count, obtain absorbed dose value;Thermoluminescence dosimeter is annealed again, for subsequent circulation use conveniently.The application in the application multiple thermoluminescence dosimeters are irradiated simultaneously, shorten time;Two independent measurements, deduct interference signal;Complex operation process standardization, programming, improve measurement repeatability and efficiency, convenient, novel, accurate.

The invention discloses a data processing method and system for a phase difference method coating thickness gauge, and belongs to the technical field of nondestructive testing. The method aims at solving the problems that due to Gaussian random noise, periodic electromagnetic interference and outlier accidental noise, frequency-phase difference data are scattered, the linear fitting degree is low, and measurement repeatability is poor. The method comprises the following steps: acquiring original frequency-phase difference data; preprocessing is carried out through filtering and adaptive outlier detection; performing core straight line fitting on the preprocessed data by using robust regression algorithms such as random sample consensus (RANSAC), and extracting a stable linear relationship; according to the method, three types of typical noise can be restrained in a targeted mode, after treatment is conducted through the method, the standard deviation of repeated thickness measurement of the same standard part can be reduced by about 60%-80% compared with a direct linear fitting method, the repeatability and reliability of measurement are greatly improved, and an effective solution is provided for accurate and stable measurement of the coating thickness.