Piezopolymeric Transducer for Ultrasonic Sensorial Systems

This paper presents a prototype of an ultrasonic transducer based on electromechanical film (EMFi). This electromechanical film provides a wide bandwidth response, useful for robotic applications. Furthermore, its sensitivity is constant enough to allow echo-pulse measurement in the desired frequency range. The emission patterns are obtained for different configurations, verifying the correspondence between experimental data and theoretical piston-like model. Results suggest that the polymer can be suitably used as a broadband ultrasonic transducer, in order to improve performances in ultrasonic sensorial systems, where the emission encoding with binary sequences, and the used modulation schemes, require considerably large bandwidth.