Title :
Thermal control of a dual mode parametric sapphire transducer
Author :
Belfi, Jacopo ; Beverini, Nicolò ; De Michele, A. ; Gabbriellini, Gianluca ; Mango, Francesco ; Passaquieti, Roberto
Author_Institution :
Dept. of Phys., Univ. of Pisa, Pisa, Italy
Abstract :
We propose a method to control the thermal stability of a sapphire dielectric transducer made with 2 dielectric disks separated by a thin gap and resonating in the whispering gallery (WG) modes of the electromagnetic field. The simultaneous measurement of the frequencies of both a WGH mode and a WGE mode allows one to discriminate the frequency shifts due to gap variations from those due to temperature instability. A simple model, valid in quasi-equilibrium conditions, describes the frequency shift of the 2 modes in terms of 4 tuning parameters. A procedure for their direct measurement is presented.
Keywords :
acoustic parametric devices; acoustic transducers; temperature control; thermal stability; whispering gallery modes; WGE mode; WGH mode; dielectric disks; dual mode parametric sapphire transducer; frequency shifts; gap variations; temperature instability; thermal control; thermal stability; thin gap; whispering gallery modes; Dielectrics; Displacement measurement; Oscillators; Q factor; Resonance; Resonant frequency; Temperature dependence; Temperature sensors; Transducers; Tuning; Aluminum Oxide; Computer-Aided Design; Equipment Design; Equipment Failure Analysis; Membranes, Artificial; Micro-Electrical-Mechanical Systems; Reproducibility of Results; Sensitivity and Specificity; Transducers; Vibration;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2010.1387
