Compensation network design for capacitive ultrasonic transducers

The frequency response characteristic of a through transmission Capacitive Ultrasonic Transducer (CUT) system is quite often dominated by membrane resonances of the transmit and receive devices and transmission channel distortion. Simple analog filtering stages may be appropriately designed to compensate for the most pronounced of these channel effects. In many ultrasonic inspection applications a reasonable SNR of the received signal across the passband is important since frequency dependant attenuation is being measured. The design and simulation of Zobel T, lattice, and biquadratic op amp cascaded equalisation filter architectures to address this issue are presented in this work.