Spherical-sapphire-based whispering gallery mode resonator thermometer

被引：7
|
作者：
Yu, Lili [1 ,2 ]
Fernicola, V. [1 ]
机构：
[1] INRIM, I-10135 Turin, Italy
[2] Politecn Torino, DISPEA, I-10129 Turin, Italy
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2012年 / 83卷 / 09期
关键词：
CRYOGENIC TEMPERATURES; DIELECTRIC CRYSTALS; PERMITTIVITY;
D O I：
10.1063/1.4746991
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
A novel microwave whispering gallery mode (WGM) resonator based on a spherical sapphire crystal was developed at INRIM and its use as a thermometer was tested. The temperature dependence of the WGM frequencies was studied and the most promising resonance near to 13.6 GHz, with a loaded quality factor as large as 82 000, was carefully investigated. Its potential use in thermometry was evaluated through a study of its main metrological characteristics, such as the temperature sensitivity, the frequency stability, the repeatability, and the resolution at several temperatures over the temperature range -40 degrees C to 85 degrees C. Finally, the INRIM spherical sapphire thermometer was compared with the NIST SWGT, a dielectric thermometer based on a cylindrical sapphire resonator [V. B. Braginsky, V. S. Ilchenko, and Kh. S. Bagdassarov, Phys. Lett. A 120(3), 300 (1987)]. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4746991]
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页数：5
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