Measurement Uncertainty In The Research On The Application Of Basic Experiments

Measurement is a job that is necessary in science and technology, industrial and agricultural production, domestic trade, construction projects and all areas of daily life. The purpose of measurement is to confirm the magnitude of variable, the value of the uncertainty determines that if the result of the measurement is good or useful.Uncertainty theory is brought forward and developed gradually in the 1980s, measuring uncertainty is the quantitative evaluation of quality. It is the basic and the most important characteristics of measuring system and it is widely used in quality and metering areas and so on.Because of the development of international trade the accuracy and reliability of the data are highly requested in order that the quality of detecting data could be verified, compared and recognized in the world. The definition of measuring uncertainty ,uncertainty assessment and the adoption representation methods are the development of metering science, and it is built and perfected base on the modern theory of error , It is also an important embodiment of the standardization of results.Laboratory is an important base that is necessary for production test and scientific research. ISO / IEC 17025 must be observed to generally assembled the instruments in order that the laboratory work could be recognized。Measuring uncertainty and statistical analysis are very important and they are the base of laboratory construction. There are a large number of measuring data in experiment record, It needs a best handling scheme which is jointly agreed to deal with the experimental data, this scheme is constantly modified and perfected with the development of science and technology. We should execute the scheme totally in basic experiment teaching and make the students know the handling methods of experimental data through teaching practice. Recently the concept of measuring uncertainty is gradually introduced in the basic experiment teaching in some colleges and applied in teaching and research. In our school measurement uncertainty has been edited into the teaching materials of "college physics experiment", and it is gradually applied to the experimental teaching and brings an effect in the formation of the experimental apparatus system.This article describes the purpose and meaning of uncertainty study,the present situation of apply and the evaluation methods of measuring uncertainty. A detailed analysis about the difference between the measuring uncertainty and the concept of the error is described in this article. The definition of standard uncertainty, the basic formula of uncertainty, the whole assessment process of uncertainty and the probability distribution, confidence factors and other factors in the analyzing and calculating process of uncertainty are described in detail。It also analyses the apply of measuring uncertainty in a specific manner according to the experiment of Newton's rings and measuring wire tension with the static Young's modulus,and the article make the simplification in allusion to the problems that happen in the process of uncertainty apply such as it is complicated to calculate,difficult to grasp and hard to understand.According to the requisition of uncertainty and through the assess experiment,we built mathematical model,analyze the sources of uncertainty,assess the uncertainty and then give a canonical result of assess.The concepts that are easily confused are clarified in this article through the analysis of theory and experiments。This article provides the effective way of how to elect a proper experimental scheme by combining the research of actual examples.The theory of measuring uncertainty should be completed to the experimentalteaching with the overall advance of quality-oriented education in college.To grasp the concept of uncertainty and strengthen the research of measurement uncertainty apply should be an important link of the reformation in basic experiment study. The description of uncertainty and examples in this article help to apply the measuring uncertainty correctly , raise the reliability of experimental results and encourage to accelerate the apply and research of uncertainty in basic experiment.