MULTI-ELEMENT, CAPACITIVE, ULTRASONIC, AIR-COUPLED TRANSDUCER

摘要

A multi-element, capacitive, ultrasonic, air-coupled transducer includes a membrane having an electrically conductive face; and a plurality of electrically separate conductive elements, consisting of a central disc and a plurality of rings arranged concentrically with the central disc, the conductive elements each having a face arranged facing the membrane and the faces of the conductive elements being of the same surface area; wherein the central disc has a radius of between 10 mm and 15 mm and wherein the number of conductive elements is between 12 and 18.