SAPPHIRE DIELECTRIC RESONATOR TRANSDUCERS

A recently developed sapphire dielectric resonator transducer has high Q factor at room temperature and can allow the construction of transducers with very high electromechanical coupling and very low losses at 4.2 K. In this paper we present the theory and experimental tests of a sapphire dielectric resonator transducer. We explain the shape of the tuning curves and describe a new configuration which can have even more sensitivity. The performance of a room temperature prototype transducer which has a noise floor of 10(-14) mHz-1/2 is described. Accelerometers with sensitivity of 10(-13) g could be constructed using this device.