Estimating the uncertainty of time-dependent measurements-a status report

摘要

Current methods for estimating uncertainty do not specifically include time as an element in the measurement process. In order to include time it is necessary to define appropriate terminology beginning with the meaning of "time-dependent measurements". In addition it is proposed that an a priori dynamic model of the measurand is a prerequisite to all measuremnts and also to the estimation of their uncertainty. This model must incorporate as much information as possible about the expected temporal behavior of what is termed the "true value" of the measurand. Given this model, the measurement process can be broadly categorized as steady-state, almost steadystate, transient or dynamic.