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

Claim 17:
18. An ultrasonic device, comprising:
a transducer having a piezoelectric element therein;
a first acoustic matching layer comprising polyethersulfone (PES);
a second acoustic matching layer extending between said first acoustic matching layer and 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 ZL2, where N is equal to two and ZL2 is defined as:

0.75((Zp)2(Zg)2)0.25≤ZL2≤1.25((Zp)2(Zg)2)0.25,

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