Acceleration Insensitive Resonators.

摘要

The objective of the research is to study the sensitivity of frequency changes when the crystal resonator is subject to an acceleration of arbitrary direction. The acceleration produces body force which causes stresses in the resonator. These stresses, in turn, affect the frequency shift. A numerical analytical approach has been developed and employed to compute systematically how the acceleration sensitivity depends on a number of parameters , such as the support orientation, support structures, plate thickness, plate orientation, ratio of mass of electrodes to mass of the plate, and the location of electrode mass. It is found that by controlling one or a combination of these parameters, the acceleration sensitivity can be reduced for resonators without electrodes. For resonators with electrodes, the unevenly distributed electrode masses may be one of the dominating causes of the wide variations of observed acceleration sensitivity. Acceleration sensitivity may, therefore, be reduced significantly by placing electrode mass symmetrically with respect to the center of the plate.