Method for automatically evaluating uncertainty of measurement of virtual instrument

A technology of measurement uncertainty and virtual instrument, applied in the direction of instruments, complex mathematical operations, etc., can solve problems such as not satisfying the applicable conditions of explicit analysis

Inactive Publication Date: 2009-11-18
BEIHANG UNIV
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Problems solved by technology

[0005] At present, the uncertainty evaluation of measurement results mostly adopts the offline mathematical statistics method recommended by the Guide to the Expression of Uncertainty in Measurement (GUM), but since the virtual instrument supports multi-channel signal input and multi-channel output, digital The signal processing mechanism often does not meet the applicable conditions of explicit analysis, derivability, and near-linearity set by GUM, and the uncertainty sources of the data acquisition cards and different integrated sensors used are characterized by diversity and complexity, so For virtual instrument measurement uncertainty evaluation, it is often an engineering problem to adopt GUM-based evaluation methods

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  • Method for automatically evaluating uncertainty of measurement of virtual instrument
  • Method for automatically evaluating uncertainty of measurement of virtual instrument

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[0082] In order to illustrate the feasibility of the method of the present invention and verify the validity of the automatic evaluation module of measurement uncertainty, a virtual instrument is used to measure the effective value of a certain temperature signal. The integrated sensor is composed of a current output temperature sensor AD590K and a signal conditioning board AD522B Composition, the data acquisition card uses the PCI-6024E data acquisition card, the effective value measurement carries on the measurement uncertainty evaluation experiment. The specific implementation method is:

[0083] 1. Build the entire virtual instrument measurement chain according to step 1 and step 2 in the content of the invention.

[0084] 2. According to step 3, analyze the sources of uncertainty of the integrated sensor and data acquisition card.

[0085]AD590K is a single-chip integrated two-terminal temperature-sensing current source produced by American Analog Devices. Its temperatur...

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Abstract

The invention relates to a method for automatically evaluating uncertainty of measurement of a virtual instrument, aiming at realizing analysis and processing of measuring signals in a form of software as well as applying a Monte Carto method to evaluate the uncertainty of measurement of the virtual instrument by avoiding the limitation to explicit expression, resolution and linearity of measurement mechanism in the traditional method for evaluating the uncertainty of measurement; the method has the core that measurement error simulation data generated according to random variable sampling principle is blended into measurement programs to obtain a plurality of pseudo measuring results, and the uncertainty of measurement of the virtual instrument is evaluated by the statistic of the pseudo measuring results.

Description

(1) Technical field [0001] The invention relates to a method for automatically evaluating the measurement uncertainty of a virtual instrument, which belongs to the technical field of test and measurement. (2) Background technology [0002] The 1970s and 1980s were the period of formation and rapid development of modern uncertainty theory. After decades of research and development, a relatively complete theoretical system has been formed. It is a combination of static measurement uncertainty and dynamic measurement uncertainty, The error analysis and data processing theory integrating random error and systematic error, measurement data and measurement method, and various error distributions have realized the combination of uncertainty theory and computer application technology. In recent years, the continuous emergence of new theories and new methods has injected new vitality into the theoretical research of virtual instrument measurement uncertainty. [0003] Monte Carlo me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D18/00G06F17/18
Inventor 王中宇葛乐矣
Owner BEIHANG UNIV
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