The use of piezoelectric wafer active sensors (PWAS) for embedded ultrasonic nondestructive evaluation (NDE) is described. PWAS structure and principle of operation are presented. The interaction between PWAS and ultrasonic Lamb waves is modeled and analyzed, and excitation “sweet spots” for preferentially exciting certain Lamb wave modes are identified. Recent trends in guided-wave ultrasonic ...

This paper presents an analysis of use ultrasonic standing wave in cell separation from bodily fluids based on the example erythrocyte plasma. It describes movement red blood cells plasma under influence acoustic field (whose forces result interaction with as vibrating medium) and resistance Stokes’ Oseen’s approximation. The general properties solutions motion equation are given. for parameter...