New method of parasitic mode suppression in lateral-field-excited piezoelectric resonator

Array of piezoelectric lateral electric field excited resonators

“…We have earlier proposed a novel procedure to suppress parasitic oscillations that consists in applying an absorbing coating on a certain portion of the resonator [9]. This approach has allowed us to form a clear resonance frequency dependence of electric impedance or admittance for electrodes with simple rectangular shape.…”

Liquid sensor based on a piezoelectric lateral electric field-excited resonator

“…The central problem with the design of resonators is suppression of unwanted oscillations to ensure a high Q-factor for a given resonant frequency. There are several ways to solve the problem, particularly, selection of optimal shape for electrodes and their strict orientation about the crystallographic axes of the plate [6,8,9] or by applying an absorbing layer to a certain part of the resonator [7,10,11]. The potentials of the resonators as liquid sensors have been demonstrated in Refs.…”

“…This paper presents a liquid sensor based on the lateral electric field-excited resonator with the simplest geometry of electrodes placed at the X-cut lithium niobate plate and demonstrates its potentials for the conducting and viscous liquids. To suppress the unwanted oscillations an absorbing film was coated on a certain part of the resonator [7,10,11]. The impedance or admittance modulus of the resonator is shown to be a more convenient informative parameter for determination of liquid viscosity and conductivity at a fixed frequency near the resonance.…”

“…The electrode orientation was chosen the lateral field components to be in parallel with the Y-axis. The area around the electrodes and a certain part of them were coated with a thin layer of a special quick-drying varnish (200 lm thick) [6,10,11] to damp parasitic oscillations and to increase the Q-factor of the resonator. The width of the coated part of the electrodes was $2 mm in accordance with Ref.…”

Resonances and energy trapping in AT-cut quartz resonators operating with fast shear modes driven by lateral electric fields produced by surface electrodes

“…LFE results in reduced aging, higher Q (quality factor) values and increased frequency stability because the regions of greatest vibrational motion are free of electrodes. Therefore LFE has received more and growing attention recently for both quartz resonators/sensors [12][13][14][15][16][17][18][19][20][21] and similar devices made from other crystals [22][23][24][25].…”