Department of Physics, Enrico Fermi, and Consorzio Interuniversitario per Scienze fisiche della Materia unita di Pisa, University of Pisa, Pisa, Italy.
IEEE Trans Ultrason Ferroelectr Freq Control. 2010 Jan;57(1):121-5. doi: 10.1109/TUFFC.2010.1387.
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.
我们提出了一种控制蓝宝石介电换能器热稳定性的方法，该换能器由两个介电盘组成，它们之间有一个薄间隙，在电磁场的 whispering gallery（WG）模式下共振。同时测量 WGH 模式和 WGE 模式的频率，可以区分由于间隙变化引起的频率偏移和由于温度不稳定引起的频率偏移。在准平衡条件下，一个简单的模型可以用 4 个调谐参数来描述这两个模式的频率偏移。本文提出了一种直接测量这些参数的方法。
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