THE USE OF PHASE-FREQUENCY CHARACTERISTICS FOR THE IDENTIFICATION OF EQUIVALENT CIRCUITS
OF PARAMETRIC SENSORS 

Chernetsov Mikhail Vladimirovich, candidate of technical sciences, associate professor, head of sub-department of technical quality management, Penza State Technology University (1a/11 Baydukova avenue/Gagarin street, Penza, Russia), kafedratuk@yandex.ru

621.317.08

10.21685/2307-5538-2018-2-4

Background. Object of research are methods for the identification of equivalent circuits of parametric sensors in the form of a bipolar electric circuit. Known methods of identification based on the analysis of the spectral characteristics, as use of intermediate values of the intensity components of the output signal, which depend on voltage, current and other factors, including noise. Higher accuracy is achieved by using intermediate values of frequency and phase, which are more resistant to interference, and the accuracy of the frequency standard (time) is much higher. Therefore, the development of methods for the identification of equivalent circuits of parametric sensors for their phase characteristics, of course, relevant. The aim of this work is to develop methods, conditions, and identifying the characteristic features that facilitate the identification of equivalent circuits in the form of a bipolar electric chains on the basis of the study of the phase-frequency characteristics.
Materials and methods. Proposed in the identification of bipolar circuits to use not only the phase-frequency characteristics, but also
differential phase frequency characteristics, which allows to clarify the features of topology of electrical circuits and increase the reliability of the result. It is possible to obtain ambiguous solutions for circuits containing parallel connected condenser and inductance, is made of wire having a resistance. The analysis uses known principles of the theory of electrical circuits and MatLab software.
Results. Developed methods of identifying circuits in the form of a bipolar electric circuits parametric sensors based on the analysis of the phase-frequency and differential phase-frequency characteristics. The proposed algorithms and conducted a study on the example
of the equivalent circuit of the inductive sensor. The conditions under which the adoption of controversial decisions in the identification of the equivalent circuit.
Conclusions. Developed the theory of identification of equivalent circuits of parametric sensors, the described two-pole electrical circuit, by the use of in deciding the results of the analysis of the phase-frequency and differential phase-frequency characteristics. The study of decision algorithms and the obtained results are consistent with the basic provisions of the theory of electrical circuits.

identification bipolar electrical circuits, impedance, phase-frequency characteristics differential phase frequency characteristics, parametric transducer, equivalent circuit