Thermal control of a dual mode parametric sapphire transducer.
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.
Belfi
Jacopo
J
Department of Physics, Enrico Fermi, and Consorzio Interuniversitario per Scienze fisiche della Materia unita di Pisa, University of Pisa, Pisa, Italy. belfi@df.unipi.it
Beverini
Nicolò
N
De Michele
Andrea
A
Gabbriellini
Gianluca
G
Mango
Francesco
F
Passaquieti
Roberto
R
D000537:Aluminum Oxide / Q000737:chemistry*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008567:Membranes, Artificial; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers; D014732:Vibration
D008567:Membranes, Artificial; D000537:Aluminum Oxide