Which barrier isolates the internal transducer components from the case to prevent vibration-induced voltages in the PZT?

Which barrier isolates the internal transducer components from the case to prevent vibration-induced voltages in the PZT?

• A. Acoustic insulator
• B. Case
• C. Matching layer
• D. Wire

Answer: (A)

The barrier being tested is about stopping mechanical energy from reaching the piezoelectric crystal. An acoustic insulator sits between the internal transducer components and the case to damp and decouple vibrations, so movement of the case doesn’t transfer energy into the PZT and create unwanted voltages. The case itself isn’t an isolation barrier, the matching layer’s job is to optimize energy transfer to the tissue rather than isolate vibrations, and a wire simply carries electrical signals.

The barrier being tested is about stopping mechanical energy from reaching the piezoelectric crystal. An acoustic insulator sits between the internal transducer components and the case to damp and decouple vibrations, so movement of the case doesn’t transfer energy into the PZT and create unwanted voltages. The case itself isn’t an isolation barrier, the matching layer’s job is to optimize energy transfer to the tissue rather than isolate vibrations, and a wire simply carries electrical signals.