Symmetric reflector plates doubling transducer efficiency

This paper proposes a new structure using reflector plates mounted in front and in back of the transducer at an angle of 45 degrees, so that acoustic waves from both sides are combined to form a single main beam. Since the propagation path lengths of the two beams are identical they constructively add at all frequencies. The principle has been applied to a PVDF air transducer and a thickness mode PZT transducer in water.