Frequency Detector Using Piezo Laminated Cantilever Beam

A method to measure the frequency of the signal using piezo laminated cantilever beam is proposed. The frequency is detected from the pattern acquired from the sensor output. Electronics for the sensor is built using microcontroller 89C51 and is found to respond over a range of 3-35Hz with a resolution of 1mHz. The sensor is also simulated using COMSOL Multi physics software. The proposed method is simple and it does not consume power from the measurand.