| 摘要 |
A piezoelectric film transducer 4 is mounted on a support 6 held to a PCB 8 to form a cantilever beam 9. Generating a signal impulse in the piezoelectric transducer causes the beam 9 to vibrate. Depending on whether the beam is free, damped by contact against an external object, or present within a fluid or powder, the vibration characteristics differ thereby enabling determination of such condition. Applications may, for example, be use as a switch or detector of presence of dry powder in a printer toner. |
