Which layer isolates internal components from the case to prevent vibrations-induced voltages in the PZT?

Which layer isolates internal components from the case to prevent vibrations-induced voltages in the PZT?

• A. Case
• B. Electrical shield
• C. Acoustic insulator
• D. Wire

Answer: (C)

Vibration-induced voltages arise when mechanical energy from the surrounding case couples into the piezoelectric transducer, causing stress in the PZT that generates unintended electric signals. An acoustic insulator placed between the internal components and the case dampens and decouples that mechanical energy, so less vibration reaches the PZT. With reduced mechanical stress on the piezoelectric material, spurious voltages are minimized, improving signal stability and accuracy. The case mainly serves as a structural enclosure and doesn’t specifically reduce internal vibration transmission. An electrical shield blocks electromagnetic interference, not mechanical vibrations. A wire is a conductor and has no role in dampening mechanical energy.

Vibration-induced voltages arise when mechanical energy from the surrounding case couples into the piezoelectric transducer, causing stress in the PZT that generates unintended electric signals. An acoustic insulator placed between the internal components and the case dampens and decouples that mechanical energy, so less vibration reaches the PZT. With reduced mechanical stress on the piezoelectric material, spurious voltages are minimized, improving signal stability and accuracy.

The case mainly serves as a structural enclosure and doesn’t specifically reduce internal vibration transmission. An electrical shield blocks electromagnetic interference, not mechanical vibrations. A wire is a conductor and has no role in dampening mechanical energy.