A new self-sensing electronics for piezoelectric resonance sensor

A new self-sensing electronics for a piezoelectric-excited and piezoelectric-sensed cantilever-based resonant sensor is proposed. The self-sensing is achieved by using the positive half cycle of the excitation signal for actuation and sensing during negative half cycle. The proposed self-sensing electronics has been proven effective to track the variation in resonance frequency in a mass-sensitive resonant sensor. The concept is proved by analytical and numerical simulation; experimentation is carried out to test the practicability and applicability of the proposed electronics. The proposed electronics will ease the trend of miniaturizing a piezoelectric-excited/detected resonant sensor as the need for a single piezo for sensing and excitation has increased.