| Autor: |
Kozyrev, G. I., Nazarov, A. V., Soldatenko, V. S., Usikov, V. D. |
| Zdroj: |
Measurement Techniques; Feb2021, Vol. 63 Issue 11, p870-876, 7p |
| Abstrakt: |
Problems related to the use of measurement systems and the variation of the parameters of measurement systems under the effect of different types of destabilizing factors, including time, are considered. Meanwhile, the primary elements of the measurement tract, i.e., sensors and conversion instruments, are the most susceptible to this influence. Deviations of the values of the parameters of testers from the nominal values leads to major errors in the estimation of an unknown input signal, which results in a need for current (i.e., in the course of use) identification of the tester. The problem of current identification of the parameters of a tester subjected to unknown input influences is solved. The procedure of identification is realized through the introduction of a secondary channel that transforms a measured quantity in the spatial domain. In this case, transformation of a measured quantity in the secondary channel of a structurally redundant tester has the form of a preliminary functional (nonlinear) transformation of mth degree of an input signal. The solution of the problem of current identification is considered for a linear static characteristic of the basic channel of a measuring transducer. The additional equation in the solution of the problem of current identification and performance of metrological self-control in a smart sensor is represented in the form of a regression relationship between the output signals of the secondary and basic channels of a structurally redundant tester. The unknown parameters of the regression equation are determined from the results of processing time samples of the output signals of the secondary and basic channels by the method of least squares. Dependences of the mean-square error of measurements of the input quantity on the mean-square strength of the noise of measurements in the output signals of the structurally redundant tester, the dynamic behavior of the variation of the input signal, and the degree of nonlinearity m of the preliminary functional transformation in the secondary measurement channel are presented. In the course of the investigation it is discovered that the form and spectrum of the input signal do not significantly affect the precision of the measurements. It is shown that preliminary quadratic (m = 2) transformation of an input signal in the secondary channel of a minimum redundancy sensor produces the highest level of measurement precision. The results of the investigation may be used for metrological self-control in smart sensors or smart measurement systems. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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