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Lateral Field Electroded (LFE) sensors may be used to measure the permittivity and conductivity (electrical properties) of liquids in contact with the surface opposite the electroded side. Our previous Finite Element Analysis (FEA) calculations studied these devices for the two quartz boundary conditions of surface-charge-free and grounded. Those results helped sort out which thickness-shear modes...
Specifically designed lateral field excited (LFE) quartz crystal resonator sensors have been applied to liquids with systematically varied acoustic and electrical properties. Dramatic changes in the conductance spectrum including an extraordinary shift of the resonance frequency have been found when the bare sensing surface of the crystal is exposed to water [1]. It will be shown that the sensitivity...
Lateral field electroded (LFE) sensors have been recently introduced that can study the permittivity and conductivity (electrical properties) of liquids in contact with the surface opposite the electroded side. The unique feature of these sensors is that the response depends in part on changes in the electrical field distribution in the quartz blank due to the electrical properties in the liquid....
This work is a continuation of an earlier study on drive level dependence (DLD), wherein the resistance of a thickness-shear crystal changes at low drive levels as the drive level changes. The earlier work used a 2-D Finite Element Analysis (FEA) to show that a surface irregularity, such as an attached particle, causes rotational imbalance in the motion of a contoured thickness-shear crystal, which...
We have found it possible to suppress the B-mode of fundamental mode SC-cuts over wide temperature ranges by imbedding the B-mode in a cluster of C-mode anharmonics with choice of diopter. This work presents a variety of theoretical results and experimental data supporting the approach.
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