The influence of the gap between free side of the piezoelectric resonator with lateral electric field based on lithium niobate and conducting layer on the surface of dielectric plate on the frequencies of parallel and series resonances has been experimentally investigated. The measurements were carried out in the temperature range 14 – 45ºС. It has been shown that the frequency of the parallel resonance monotonically increased on 1.3% at the increase of the gap width from 0 up to 3.5 mm at the fixed temperature. The change in the frequency of the series resonance in the range 0 – 3.5 mm at the constant temperature does not exceed 0.02 – 0.07%. Theoretical analysis numerically confirmed the measured dependencies of resonant frequencies on gap width. It has been shown that the difference between theoretical and experimental dependencies of frequencies of parallel and series resonances on gap width is less than 0.6%. It has been demonstrated the possibility of the development of the meters of displacements with the tempperature compensation which may be used for monitoring the deformations and crack openings of various constructions.
$^1$Kotel’nikov Institute of Radio Engineering and Electronics of RAS, Saratov Branch
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