Attenuation of acoustic normal modes in piezoelectric plates loaded by viscous liquids

Liquid sensor based on a piezoelectric lateral electric field-excited resonator

“…The measured frequency dependencies of (a) real and (b) imaginary parts of electrical impedance for a resonator contacting with the liquid of different values of conductivity: distilled water (1), 10 lS/cm (2), 50 lS/cm (3), 100 lS/cm (4), 500 lS/ cm (5), 1000 lS/cm (6), 5000 lS/cm (7), and 10,000 lS/cm (8). (4), 500 lS/ cm (5), 1000 lS/cm (6), 5000 lS/cm (7), and 10,000 lS/cm (8). are shown in Fig.…”

“…It has been shown that by using the traditional piezoelectric bulk acoustic wave resonators one can measure not only liquid viscosity but also its conductivity [1]. The possibilities of plate acoustic waves of zero [2,3] and higher orders [4,5], the velocity and attenuation of which depend on viscosity and conductivity of liquids, were also demonstrated. But in recent years the designers of liquid sensors have given the special attention to piezoelectric lateral electric field-excited resonators.…”

The propagation of horizontally polarized shear waves in plates bordered with viscous liquid

“…The interactions of the HPSW with viscosity liquid result in wave parameters change like resonance, phase shifts, propagation time, and wave attenuations of the received wave. [1][2][3][4][5][6][7][8][9][10][11] An overview of typical design and application of acoustic wave sensors is given in [12].…”

Quasi-Linear Polarized Modes in Y-Rotated Piezoelectric GaPO4 Plates

“…In reference [4,5] 4 , KDP and ZnO. Viscosity sensors with high-sensitivity, low-insertion loss, and good stop-band rejection were implemented on quartz, LiNbO 3 and LiTaO 3 [6]. Unfortunately, the conventional piezoelectric materials such as quartz, AlPO 4 , LiNbO 3 and LiTaO 3 , are not suitable to work at high temperature as they undergo α to β phase transition at temperature in the range from about 300 to 588 °C.…”