MODES OF MOTION IN QUARTZ CRYSTALS 



81 



.4r-cut. When placed on a frequency rather than a ratio of axis basis the 

 frequencies at which flexure modes along the X axis would coincide with the 



5.00 



,1 4.95 



4.90 



t = Y'= 1 .00 MM 

 W= Z'= 15.90 MM 



X= X 



M = 3 

 N=3 



M"3 



N-1 



N. 





*«v«>->.^^^ 



^^ 



3RD Xv^' 

 SHEAR 



Fig. 6.16 — High frequency flexure and shear resonances in an .4r-cut quartz plate near the 



third harmonic shear mode. 



fundamental A^^- shear mode are experimentally given by 



. 1818 ,., , 



/j/ = — — - Wi/ kilocycles 



6.20 



