The Effects of Surface Contamination on the Noise and Drive-Level Sensitivity of Piezoelectric Resonators.
Technical progress rept.,
ARMY LAB COMMAND FORT MONMOUTH NJ ELECTRONICS TECHNOLOGY AND DEVICES LAB
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The effects of surface contamination on the short term instabilities and drive level sensitivities of piezoelectric resonators are explored. A plausibility argument is presented to show that the adsorption and desorption of surface contamination may be a significant contributor to short term instabilities. Although high drive levels produce high velocities and accelerations at resonator surfaces, the extra kinetic energy imparted directly to contaminant molecules by the high drive levels is shown to be negligible compared to the adsorptiondesorption energies of the contaminant molecules of concern. Since adsorptiondesorption rates depend exponentially on temperature, and since the increased dissipation caused by high drive levels raises the resonators temperature, surface contamination can influence a resonators drive level sensitivity via thermal effects. Keywords Contamination Surface contamination Noise Resonator Quartz resonator Piezoelectric resonator Adsorption Desorption drive level Short term stability.
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