2009/12/31 by Jacopo Belfi, Nicolò Beverini, Belfi, Jacopo +9
Physics and Astronomy · #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #physics.ins-det
paper · pdf · doi:10.48550/arxiv.1001.0140
5 pages, 6 figures, presented at EFTF-IFCS joint conference 2009
arxiv created 2009/12/31 · arxiv updated 2010/01/14
We propose a method to control the thermal stability of a sapphire dielectric transducer made with two 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 two modes in terms of four tuning parameters. A procedure for the direct measurement of them is presented.