![]() ![]() When a mechanical load is applied to the element, the frequencies in the response spectrum will shift to different values, and the magnitude of this shift is proportional to the applied load. If you want to use a piezoelectric element as a transducer in your board, it can be excited at multiple resonance frequencies. One important point here is that any vibrating mechanical membrane, which includes a piezoelectric crystal, has a spectrum of natural frequencies, not just a single resonance.įurthermore, the equivalent electronic circuit formed by a piezoelectric element has multiple resonance and antiresonance frequencies. In the case of an oscillating mechanical vibration, the output voltage also oscillates at the same frequency as the mechanical vibration. You can then use the equivalent digital number to perform some calculations and determine some physical quantity. This voltage can then be converted to digital data with an analog-digital converter (ADC) on your board. In the simplest sense, a piezoelectric material used as a sensor converts an applied mechanical load to an electric field, which can then be measured as a voltage. They are also manufactured in a variety of sizes, making them suitable for mounting on a PCB or as a packaged unit that attaches to a board with copper wire. These sensors are rugged and can withstand very high temperatures while remaining very sensitive to changes in environmental variables. With the exception of optical measurements, many dynamic measurements are gathered by examining the output from a piezoelectric sensor. As technology progresses, more sophisticated sensors are being developed for a variety of measurements, but piezoelectric sensors and transducers are here to stay. All sensors for use in electronic systems have a common characteristic: they take some type of physical disturbance and convert it into an electrical signal. From battery-powered wrist watches to electric cigarette lighters, piezoelectric elements play an important role in many devices, especially as a clock in digital circuits. ![]()
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