Piezoelectric Resonance Sensors of DC Magnetic Field

The operational principle, methods of calculation, and designs of the dc magnetic field sensors using the combination of the Ampere force, the piezoelectricity, and the acoustic resonance have been described. The prototypes of the sensors based on a lead zirconate titanate ring and bimorph structures with radial or bending oscillations excited by the alternative current have been fabricated and investigated. The sensitivity of the sensors reached 245 V/(A·T) and the measured field range was from ~10^-5 T up to several Teslas.