59 results about "Standard uncertainty" patented technology

The invention discloses an isotope dilution mass spectrometry method for determining the content of uranium in a uranium niobium alloy. A formula for calculating the content of uranium in the uranium niobium alloy is derived according to an isotope dilution mass spectrometry principle. A decomposition process of the uranium niobium alloy is researched, the sampling quantity and the amount of a diluent are optimized, and the influences of mass spectrum line interference and alloy element interference on a measurement result are discussed. The method comprises the following steps: adding nitric acid and hydrofluoric acid to quantitatively dissolve the uranium niobium alloy, adding a quantitative amount of a uranium isotope diluent to directly prepare a mixed sample solution, determining the mixed solution and the uranium isotope proportion in the uranium niobium alloy sample through mass spectrometry, and calculating the content of uranium in the uranium niobium alloy. Quantitative separation of uranium is not needed by the determined method. An XRF technique, an ICP-AES technique and an element analysis technique are used to measure the content of niobium and the total content of impurity elements in the uranium niobium alloy, and back stepping is carried out to obtain the corresponding uranium content order in order to verify the accuracy of the analytical result, and the obtained result is consistent with a result obtained through the experiment method. When the method disclosed in the invention is used to analyze the uranium niobium alloy sample, the relative standard uncertainty of determination results is 0.2% (6 determinations), and the expanded uncertainty is 0.5% (95% confidence level).

The invention, which belongs to the measurement technology field, relates to a calibration apparatus of an on-site wide-range vacuum gauge and a method thereof. The calibration apparatus comprises: an air source, a pressure-reducing valve, a micro-adjustable valve, a monitoring vacuum meter, five vacuum stop valves, three capacitance film gauges, a pressure stabilizing chamber, a first stop valve, a mechanical pump, a second solenoid valve, a molecular pump, an all-metal angle valve, a vacuum chamber, a calibrated vacuum gauge, and a vacuum monitoring vacuum gauge. Besides, a current limitingair exhaust micropore is arranged in the vacuum chamber; and an air inlet micropore is arranged in the fifth vacuum stop valve. In addition, according to the method, a calibration range of the vacuumgauge is in a pressure intensity rang of from 10 <5> to 10 <-7> Pa; a standard uncertainty within the pressure intensity range of from 10 <5> to 10 < -1> Pa is 1.5%; a standard uncertainty within therange of from 10 <-2> to 10 <-6> Pa is 2.0%; and when the pressure intensity is 10 <-7> Pa, a standard uncertainty is 5 %; and the method has advantages of wide measuring range and high precision andis suitable for on-site operation. Moreover, the apparatus has advantages of small volume and light weight.

The invention discloses a method for measuring absorption rates of cavities on the basis of a substitution process and the efficiency of detectors, and belongs to the field of optical radiation measurement. The method has the advantages that the standard uncertainty of the method is superior to 0.001%, and the method not only is applicable to measuring the absorption rates of the cavities with high absorption rates, but also is applicable to measuring the absorption rates of the common cavities; the measured absorption rates of the cavities with sloping bottoms are 0.999928+/-0.000005; laser light is divided into measurement light beams and reference light beams by a partially-transparent and partially-reflecting mirror in measurement procedures, the stability of the laser light is monitored by a reference light path, signal voltages are measured, and ratios of the signal voltages of a signal light path to the signal voltages of the reference light path are defined as the efficiency of the detector; change trend of random errors due to drifting of the laser light has similar effects on the measurement light path and the reference light path, so that the random errors can be reduced by the aid of each ratio of two corresponding signals; the absorption rates of the cavities are measured by the aid of the efficiency of the detectors, accordingly, the standard uncertainty can be improved, and the absorption rates of the cavities with the high absorption rates can be measured.

The invention provides a high-precision measuring method of the separating characteristic of a hot work separating device, which gives consideration to the simple installation of a measuring structure, the safety and reliability of a measuring system and the high measuring precision. The uncertainty of the relative standard of the measuring system which is matched with the method is 0.184%. Compared with the conventional method, the measuring performance is more stable and the measuring precision is higher. The method not only can measure the displacement-time relationship, the separating time, the separating speed, the separating acceleration and the separating impulse of the hot work separating device with high precision, but also can be widely applied to measuring the motion characteristic of the motion parts of the other work done hot work product, and has good application foreground for accurately testing and researching the separating motion characteristic of the hot work separating device.

The invention discloses an uncertainty determination method of a spacecraft total leak rate test result. The method comprises the following steps of: determining an uncertainty source; determining uncertainty component introduced by a system effect; determining uncertainty component introduced by measurement repeatability; determining synthesis standard uncertainty; and determining expansion uncertainty. By the system, the uncertainty caused by the system effect and the uncertainty caused by the measurement repeatability are firstly evaluated, and the synthesis standard uncertainty and the expansion uncertainty are obtained according to the test result by utilizing an uncertainty basic theory. Direct basis is provided for reliability evaluation of the spacecraft total leak rate test result.

The invention discloses a computer simulation based automobile collision accident reconstruction method. The method includes: acquiring accident scene data, and drawing an accident scene drawing; constructing an automobile collision kinematic model for computational analysis; finding out uncertainty impact factors, and determining an uncertainty assessment method; inputting related accident parameters including automobile brake traces, adhesion coefficients and collision angles; assessing accident automobile speed standard uncertainty u(xi); calculating a relative combined standard uncertaintycomponent u(yi) on the basis of the parameter u(xi), and further calculating relative combined standard uncertainty; solving extension uncertainty according to the relative combined standard uncertainty; introducing computer simulation verification, establishing an automobile finite element simulation model, and performing analytical calculation. By introduction of an uncertainty principle into an automobile accident judicial expertise process, influences of each uncertain factor on accident automobile speed can be considered fully; by introduction of computer simulation, an accident occurrence process is restored, and data support is provided for judicial expertise.

The invention discloses a method of evaluating uncertainty of test results of drug components by a working curve method. The method comprises following steps: establishment of measurement result calculating formulas and mathematics models, analysis of uncertainty source, quantification of uncertainty components, calculation of synthesis standard uncertainty, calculation of expanded uncertainty and expression of measurement results. By means of the method in the invention, the main source affecting uncertainty can be accurately reflected so as to provide more reliable examination determination results.

The invention relates to a method for evaluating uncertainty of content detection result of polychlorinated biphenyl in single-point quantitative aquatic products and belongs to the technical field ofchemical detection. The method comprises the following steps: measuring the polychlorinated biphenyl content of the aquatic products by a gas chromatography-ECD method, quantifying by an internal standard method, analysing main sources of the uncertainty, quantifying uncertainty component, calculating synthetic standard uncertainty, calculating expanded uncertainty and representing the measuringresult. Accurate analysis and reasonable expression of uncertainty of sample treatment process, instrument measuring process and quantitative analysis process are realized by establishing uncertaintycalculation mathematic models, analyzing related uncertainty sources and performing reasonable quantitative calculation on each component.

The invention discloses a metrology-based R-test calibration uncertainty evaluation method, which comprises the following steps: firstly, aiming at a contact type R-test calibration process, on the basis of a measurement model and a measurement principle of the contact type R-test calibration process, analyzing various influence factors and corresponding standard uncertainty, and calculating by adopting a variable parameter method to obtain a sensitivity coefficient; then, using the GUM for calculating the position coordinate uncertainty component of the sensor, and finally, achieving final calibration uncertainty evaluation based on the MCM. According to the method, an original evaluation method is improved based on the contact R-test calibration principle, so that the purpose of improving the calibration evaluation precision is achieved, and the method is widely applied to various contact R-tests.

The invention discloses a tide level measurement uncertainty evaluation method based on a GNSS ocean buoy. The method comprises the following steps: 1establishing tide level measurement model, determining an uncertainty component in the model; respectively calculating the dynamic standard uncertainty of the uncertainty component; synthesizing the standard uncertainty of the tide level measurementresult per minute; arranging the standard uncertainty per minute according to a time sequence to obtain a tide level synthesis standard uncertainty sequence in an observation time period; and finallycalculating the expanded uncertainty. According to the uncertainty evaluation method disclosed by the invention, the accuracy of uncertainty evaluation of the data result of the GNSS tide level measurement buoy can be improved, the GNSS tide level measurement buoy is ensured to provide a qualified and reliable measurement result, and the GNSS tide level measurement buoy can better serve in the field of marine observation.

The invention discloses an uncertainty evaluation method for calculating polychlorinated biphenyl content detection results in aquatic products through an internal standard curve method and belongs tothe technical field of aquatic product quality safety detection and analysis. The method comprises the following steps: 1, calculating polychlorinated biphenyl content of aquatic species by adoptinga method for determining by a gas chromatograph and drawing an internal standard curve; 2, establishing a quantitative mathematical model X=(Cn3*x*V1*frep)/m of uncertainty of the polychlorinated biphenyl content detection results in aquatic products; 3, analyzing an uncertainty source; 4, determining assessment of each component of the uncertainty; 5, calculating the synthetic standard uncertainty. According to the method disclosed by the invention, by establishing the uncertainty calculation mathematical model, analyzing the related uncertainty source and performing reasonable quantified calculation on each component, accurate analysis and reasonable expression of the uncertainty in a sample treatment process, an instrument determination process and an internal standard curve quantitative analysis process can be realized.

The invention relates to a precision scale with a scale chamber (16), a windshield (18, 20, 22) which surrounds the scale chamber (16), an air conditioning module (34) which is removably arranged in the scale chamber (16), a processor (32) which is arranged in the precision scale, a data input unit which is arranged on the precision scale, and a data transmission path with which data can be exchanged between the air conditioning module (34) and the processor (32), said processor (32) containing a measurement uncertainty detection module (33) with which the measurement uncertainty of the scale can be ascertained. The invention also relates to an air conditioning module for electrically coupling to a precision scale in a removable manner, said air conditioning module (34) forming a sealed unit and having an air pressure sensor (62), a humidity sensor (54), an air temperature sensor (52), and a part of a data transmission path via which data can be transmitted to a processor outside of the air conditioning module. The invention finally relates to a method for determining the measurement uncertainty of a precision scale comprising a scale chamber (16) which is separated from the surroundings by a windshield and in which an air pressure sensor (62), a humidity sensor (54), and an air temperature sensor (52) are arranged, said sensors (52, 54, 62) being coupled to a processor (32). Goods to be weighed, in the form of a test object, are weighed, and the following steps are carried out: - ascertaining the air pressure, the humidity, and the air temperature in the scale chamber (16) using the sensors (52, 54, 62); - weighing the test object; - determining the standard uncertainty of the weighing method; - determining the standard uncertainty of the mass of the test object; and - ascertaining a total uncertainty of the scale result.

The invention relates to a method for measuring uncertainty of an industrial CT geometric dimension based on a spherical die body, and belongs to the technical field of industrial CT dimension measurement. The method comprises the following steps: selecting a ball model as a detected workpiece and carrying out calibration detection to obtain a calibration certificate; performing industrial CT scanning reconstruction on the detected workpiece; completing geometric dimension measurement of the ball model; and calculating standard uncertainty of geometric dimension measurement; and calculating expansion uncertainty. The method is based on the calibrated ball model, and evaluation steps and a mathematical model for industrial CT measurement uncertainty of a specific task are preliminarily established by adopting an experimental evaluation method; the system analyzes the influence of a calibration process, a measurement process, a detected workpiece, a system error and the like on the uncertainty of the measurement result and the maximum measurement uncertainty contribution mainly comes from the system error of the industrial CT equipment, and the influence of the uncertainty componentcan be greatly reduced by performing system calibration on the industrial CT equipment before measurement and thus the measurement accuracy is improved.

The present invention discloses a digitalizer mean filtering method based on density estimation. The method comprises the steps of: performing oversampling of a digitalizer, performing grouping for anobtained data sample sequence to obtain a plurality of sub samples, adding the sub samples to the density estimation samples, employing a fusion method of density estimation and Bayes information toobtain a probability density function of the data sample sequence, and calculating and obtaining the standard uncertainty of the data sample sequence; and performing re-grouping of the data sample sequence according to the oversampling multiples, obtaining the confidence interval of each sub sample after the repeat groups are obtained according to the standard uncertainty to obtain gross error elimination, and performing average extraction of the obtained samples to obtain final samples. The digitalizer mean filtering method based on density estimation can perform density estimation for the data sample sequence grouping obtained by sampling, and can set the confidence interval based on the density estimation result to perform gross error elimination so as to allow the mean filtering resultto be more accurate.

The invention discloses a multi-phase flow measurement method and system based on uncertainty analysis. The method comprises the following steps of: based on an equivalent flow of cross-correlation time delay and a capacitance measurement value, obtaining liquid phase flow and relative standard uncertainty thereof, and gas phase flow and standard uncertainty thereof through multiple linear regression fitting; based on the capacitance measurement value and a differential pressure measurement value, obtaining liquid phase flow and relative standard uncertainty thereof as well as gas phase flow and standard uncertainty thereof through multiple linear regression fitting; on the basis of the differential pressure measurement value and the equivalent flow of cross-correlation time delay, obtaining liquid phase flow and relative standard uncertainty thereof as well as gas phase flow and standard uncertainty thereof through multiple linear regression fitting; and comparing the uncertainties obtained in different modes, and taking the gas and liquid flow corresponding to the minimum uncertainty and the uncertainty as quality indexes for flow measurement. Errors of measurement results can be reduced, and operation and maintenance personnel can be helped to know the accuracy of the measurement results.

A photoinitiator mixed solution standard material and a preparing method thereof are disclosed. The standard material is a standard solution containing 18 photoinitiators, with the definite concentration value and corresponding combined standard uncertainty of each photoinitiator meeting related standard requirements. The method includes (1) purifying 18 photoinitiator crude products; (2) evaluating definite values and uncertainty of the purified products; (3) preparing a mixed solution standard of the 18 photoinitiators; and (4) evaluating definite values and uncertainty of the mixed solutionstandard material of the 18 photoinitiators. The photoinitiator mixed solution standard has good stability during storage at 0 DEG C, a definite value evaluating method is accurate, source tracing isreliable, and relative combined uncertainty is low (0.5-2.0%). The photoinitiator mixed solution standard material can overcome a problem that testing methods at present cannot achieve metrological traceability, increases comparison consistency of each unit testing result, and fills the gap of development of photoinitiator mixed solution standard materials at home and abroad.

The invention relates to a Bayes principle-based complex experiment uncertainty evaluation method. The method comprises the following steps of: determining that a complex experiment is measured and determining main influence factors of the complex experiment; obtaining probability density distribution functions of the influence factors of the complex experiment; carrying out experiment sampling according to the probability density distribution functions of the influence factors by adoption of a Latin hypercube sampling method, so as to obtain an experiment design table of the influence factors, and carrying out experiment according to parameters of the design table to obtain a result of the complex experiment under each input parameter, wherein a part of data of the experiment result is used as prior samples and the other part is used as currently measured samples; calculating a mean value of the prior samples and a standard difference of the mean value, and a mean value of the currently measured samples and a standard difference of the mean value; and calculating a measured truth value, a standard uncertainty and a comprising interval corresponding to a comprising probability via posterior distribution, and taking the calculation result to evaluate the uncertainty. According to the method, when experiments results of complex experiments are given, the experiment uncertainties can be given and the experiment results can be evaluated, so that experiment improvement schemes can be made.

The invention discloses a parallel reactive power compensation device electricity saving quantity measurement uncertainty evaluation method. The method includes the following steps that: (1)a parallel reactive power compensation device electricity saving quantity measurement scheme is established; (2) the equivalent circuit model of the measurement scheme is established, the digital model of parallel reactive power compensation device electricity saving quantity is obtained according to the circuit model, and the digital model is adopted as the measurement model of parallel reactive power compensation device electricity saving quantity measurement uncertainty evaluation; (3) the components of uncertainty are calculated; (4) the components of the uncertainty are merged into a standard uncertainty uc; and (5) the extended uncertainty U of the measurement result of the parallel reactive power compensation device electricity saving quantity is calculated. The parallel reactive power compensation device electricity saving quantity measurement uncertainty evaluation method provided by the invention is of great significance for the further improvement of the accuracy of electricity saving quantity results, has high operability and can provide references for the electricity saving quantity measurement uncertainty evaluation of electricity saving projects such as transformer economic operation and line boosting transformation.

The invention discloses an uncertainty evaluation method for an overall thermal performance test of a combined cycle unit. The uncertainty evaluation method comprises the following steps: a, establishing a mathematical physical equation between heat consumption rates and output powers of an input quantity and an output quantity; b, collecting the accuracy and parameter distribution types of test instruments and meters corresponding to all input quantities in the thermal performance test of the combined cycle unit; c, performing a thermal performance test, and calculating an input quantity matrix and standard uncertainty of test data; d, calculating the standard uncertainty of the test instrument and the instrument; e, generating a random variable delta X according to the test data and thestandard uncertainty of the test instrument and the instrument, and calculating corresponding output quantities HR (X + delta X) and P (X + delta X); and f, performing repetitive calculation, ending the calculation when the repetitive calculation result meets the condition that UN-UN-1 is less than or equal to delta U0, and calculating the final test uncertainty U according to the standard deviation sigma of the probability distribution curve. The uncertainty of the performance test of the combined cycle unit can be quickly and accurately calculated, and the method can be used for guiding theperformance test of the combined cycle unit.