Patent ID: 11890644
Assignee: SENSUS SPECTRUM, LLC
Field: Measurement (Instruments)
Classification: CPC B  G  H | IPC B  G  H

Claim 16:
17. An ultrasonic device, comprising:
a transducer having a piezoelectric element therein;
a first acoustic matching layer comprising polyethersulfone (PES), on the piezoelectric element; and
a polymer protective layer on said first acoustic matching layer;
the first acoustic matching layer having an acoustic impedance equivalent to ZL1, where N is equal to one and ZL1 is defined as:

0.75((Zp)N+1(Zg))1/(N+2)≤ZL1≤1.25((Zp)N+1(Zg))1/(N+2),

where Zp is an acoustic impedance of the piezoelectric element and Zg is an acoustic impedance of a compatible gas.