Patent ID: 9674616
Date: 2017-06-06
CPC Classifications: G01F,G10K,H04R

Claim:
1. A transducer for transmitting or receiving an acoustic signal in a medium, the transducer comprising: an piezoelectric acoustic transducer element; and a dynamic acoustic impedance matching device adjacent said transducer element, the dynamic acoustic impedance matching device providing an acoustic impedance between an acoustic impedance of said transducer element and an acoustic impedance of the medium; wherein said dynamic impedance device provides at least one particle flow adjacent to a surface of said transducer element; wherein said at least one particle flow includes a plurality of discrete particle flows layered flowing in parallel and adjacent to said surface of the transducer in a direction transverse to a signal path of an acoustic signal; and wherein each said particle flow is released above the transducer to fall by gravitational force in front of the surface of the transducer.