Thermal control of a dual mode parametric sapphire transducer

Jacopo Belfi; Nicolò Beverini; Andrea De Michele; Gianluca Gabbriellini; Francesco Mango; Roberto Passaquieti

doi:10.1109/TUFFC.2010.1387

Thermal control of a dual mode parametric sapphire transducer

IEEE Trans Ultrason Ferroelectr Freq Control. 2010 Jan;57(1):121-5. doi: 10.1109/TUFFC.2010.1387.

Authors

Jacopo Belfi¹, Nicolò Beverini, Andrea De Michele, Gianluca Gabbriellini, Francesco Mango, Roberto Passaquieti

Affiliation

¹ 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

PMID: 20040435
DOI: 10.1109/TUFFC.2010.1387

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.

MeSH terms

Aluminum Oxide / chemistry*
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Membranes, Artificial*
Micro-Electrical-Mechanical Systems / instrumentation*
Reproducibility of Results
Sensitivity and Specificity
Transducers*
Vibration

Substances

Membranes, Artificial
Aluminum Oxide