It is early at the beginning of seventies, the person that there already were more and more metrologies on international realises use " inaccuracy is spent surely " replace " error " more scientific, from now on, inaccuracy spends this term to be in gradually surely measure a domain inside be applied extensively. International Weights and Measures Bureau put forward experimental inaccuracy to be spent surely 1978 express proposal book INC-1. Made 1993 " uncertainty of measurement represents a guide " got BIPM, OIML, ISO, IEC, IUPAC, IUPAP, IFCC7 the approval that international organizes, publish by ISO, it is the important and authoritative document that international organizes. Our country already also was promulgated 1999 to it assess of compatible uncertainty of measurement and represent standard of weights and measures technique. So far, assess of uncertainty of measurement is become detect and one of jobs with calibration indispensable lab. Because the theory of uncertainty of measurement is newer, there is certain difficulty on understanding. The article undertakes discussion with respect to a few characteristics that do not spend certainly.
One, measuring an outcome is an area
Metrical purpose is to decide the value of a quantity that is measured. The quality that measures an outcome is measurement measures an outcome the most important basis of authentic degree. Uncertainty of measurement is opposite namely the mensurable token that measures result quality, the usability that measures an outcome depends on greatly the bulk that its do not spend certainly. So, measure a result to state must include at the same time gift the value that is measured and the uncertainty of measurement related to this value, just be complete significant.
Token gifts reasonably the dispersive sex of the value that is measured, with the parameter that measures result photograph connection, call uncertainty of measurement. The inaccuracy in the dictionary is spent surely (Uncertainty) the definition is " change, fluky, inaccuracy knows, inaccuracy is decided " . Accordingly, say on broad sense, uncertainty of measurement means the distrustful degree of authentic to measuring an outcome sex, effectiveness or unsure rate. Actually, because measure,do not perfect the inadequacy that knows with people, of earning be had to disperse by measured value quality, the outcome that measures every time namely is not same value, be in dispersedly with certain probability however the many values inside a certain area. Although the systematic error of objective existence is a relatively certain value, but as a result of us cannot complete acknowledge or master it, and can think it is only with some kind of probability distribution inside Yu Mou area, and itself of this kind of probability distribution also has dispersive sex. The is worth dispersive sex parameter that uncertainty of measurement shows to be measured just about, the inaccuracy that measures an outcome is spent surely mirrorred people to be in the inadequacy that knows a side to be being allowed to affirm by measured value. After the correction of although the course is right affirmatory already system error, measuring an outcome still is only be worth by an estimation of measured value, because,this is, the stochastic effect that in be being measured not only, exists will produce inaccuracy to be spent surely, and, effect amends not complete system to exist to be not spent certainly as much.
Previous12 Next