Specifics of Construction of Measuring Transducers with Logometric Output Based on Interconnected Piezoresonators

Abstract

The paper presents the results of simulation modeling of measuring devices. The simulation modeling is based on the use of coupled oscillations in systems with two degrees of freedom. Methods of controlling the parameters of the oscillatory system of the converter based on interconnected piezoresonators are considered. A comparative assessment of the metrological characteristics of possible variants of piezoresoanase sensors with logometric (differential) output is conducted.
 It is shown that when the Q-factor of the oscillatory system of the primary converter is affected, a higher sensitivity of the measuring process is provided by the control of the active resistance of the coupling element replacement circuit between the resonators. In this case, it is proposed to use the ratio of the oscillation amplitudes of one of the interconnected resonators measured at the frequencies of common-mode and antiphase oscillations in the system as the output signal of the sensor. When the frequency-setting parameters of the converter are affected, it is recommended to use the ratio of the oscillation amplitudes of two interconnected piezoresonators measured at one of the normal frequencies of synchronized oscillations in the system to generate the output signal.
 There are several advantages of measuring devices of this type, such as high sensitivity, simplicity of design, low cost, manufacturability, and operational applicability for harsh conditions.