Abstract:
A new type of radial composite piezoelectric ultrasonic transducers is presented and its radial vibration is studied. The radial vibration of a piezoelectric ceramic thin ring and a metal thin circular ring are analyzed and their electro-mechanical equivalent circuits are obtained. Using the radial boundary conditions, the electro-mechanical equivalent circuit of the radial composite ultrasonic transducer is derived and the resonance frequency equation is obtained. The relationship between the resonance frequency, the anti-resonance frequency, the effective electro-mechanical coupling coefficient and the radius ratio is analyzed. It is illustrated that when the radius ratio is increased, the resonance and anti-resonance frequency are increased; the effective electro-mechanical coupling coefficient for the first radial vibration is increased; while the effective electro-mechanical coupling coefficient for the second radial vibration is decreased.
