蜂鸣器和压电变送器
Piezoelectric transducers (“piezos”) come in many shapes and sizes
Analysis of audio signals
- Single- or multitone
- FFT analysis of multitone signal (song)
Resonator design
A front resonator can significantly amplify a piezo’s sound level. These resonators are typically high Q and are designed to enhance the highest frequency of interest. The important design parameters of a resonator are the volume and the port dimensions.
Ole Wolff uses finite element methods software to optimize the resonator design. As with all sound sources, it is critical to isolate the front and rear sides of the piezo to prevent sound cancellation.
With nodal mounting it is also necessary to isolate the inner and outer regions (inside and outside the nodal diameter). This is easily accomplished with the resonator and an enclosed back cavity created by the PCB.
Comsol simulation of a front resonator with three holes.
Electrical contact
Electrical contact is typically provided by lead wires either soldered to the PCB or fitted with a connector.This method ensures the least obstruction to the piezo’s motion. Other connection methods include coil or bent springs soldered to the PCB. This simplifies the assembly process but requires careful consideration of the spring position and the contact force. For edge mounted piezos Ole Wolff recommends the spring contacts be placed as close as possible to the outer edge. For nodal mounting it is recommended to locate the contacts near the nodal diameter.
Let Ole Wolff assist you throughout the entire design process
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