Design of Measuring Channel Systems and Automation Tools

Abstract

The article discusses probable methods for designing measuring channels (further they will be referred to as MC) of automation systems for industrial facilities based on statistical criteria. A brief review of the design of measuring channels according to circuit design, metrological and statistical criteria is given. The main task of such designs is the selection and justification of the structural circuit type of the measuring channel (direct conversion channel, balanced channel), the selection of mathematical models for typical transducer links, the selection and mathematical description of interfering signals (additive and multiplicative interference caused by instability of the basic links of the measuring channel, description of random interference in the form of probability density). The ultimate goal of these procedures is to find the confidence interval (uncertainty interval) of the measuring channel as a whole. In this study common expressions were delivered for evaluating the probable result of a technological process with the help of MC. In most cases theses expressions were reduced to short formulas. For more complex expressions the numerical method was used and the results are demonstrated in charts. The “convolution” method was used to solve the task of this study.