A non-contact piezoelectric torque sensor

This paper presents a novel piezoelectric torque sensor that operates in a non-contacting mode. This new torque sensor exhibits several advantages over existing torque sensors because of its small size, selectivity, sensitivity, and inexpensive manufacturability. An AT-cut quartz plate is used as the sensing element, which operates at its fundamental and third harmonic frequencies. Measurements were made that linearly correlate the applied torque to the sensor response. The applications of this technology are evident in the automotive industry for use in monitoring the torque, for example, on a steering wheel in a vehicle. Applications also extend to any other industrial or commercial setting where a measure of the torque on a rotating shaft is desired.