Thickness-Twist Vibrations in Beveled AT -Cut Quartz Plates

Frequencies and mode shapes of thickness-twist vibrations in beveled, rectangular AT-cut quartz plates have been determined from an infinite-strip model. In addition, the possible use of beveling for mode suppression has been studied. Experimental results from beveled plates verify the theoretical predictions. Descriptions of the calculations and comparisons with the experimental results are included. Thickness-shear frequencies and mode shapes were also calculated using a similar model and are compared with thickness-twist results.