Magnitude and phase spectral analysis of through-transmitted ultrasound pulses for the determination of the ultrasound velocity and the thickness of solid plates

A method that combines transmission of air-coupled ultrasound pulses through solid plates and magnitude and phase spectral analysis is presented. The purpose is to determine, simultaneously, velocity and attenuation coefficient of the ultrasounds in the material, and the thickness and the density of the plate. This is especially useful when thickness can not be measured independently and it is necessary to obtain estimations for the velocity and the attenuation coefficient of ultrasounds in the plate.