Comparison of Acoustic Wave Sensors With Different Cut ${\rm LiNbO}_{3}$ Working on Pseudo-LFE Mode

In this paper, two pseudo-LFE devices made up of X-cut and (yxl) 21.82° LiNbO₃ are investigated and compared. The coupling factors of both devices are calculated and the impedance characteristics are tested by impedance analyzer. The sensitivity and stability of both devices to the electrical property changes of liquid are also tested in isopropanol-water and NaClwater solution. We find that the X-cut LiNbO₃ device has a higher piezoelectric coupling factor and better resonance in the deionized water than (yxl) 21.82° LiNbO₃ device. The results also show that X-cut LiNbO₃ devices are more sensitive to the change of liquid conductivity and permittivity than (yxl) 21.82° LiNbO₃ device even with similar stability.