Quartz Tuning Fork Pressure Gauge for High-Pressure Liquid Helium

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• 作者：J. Botimer ; A. Velasco ; P. Taborek
• 关键词：Tuning fork ; Hydrodynamics ; Liquid helium ; Superfluid
• 刊名：Journal of Low Temperature Physics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：186
• 期：1-2
• 页码：93-105
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials;
• 出版者：Springer US
• ISSN：1573-7357
• 卷排序：186

文摘

We have measured the quality factor Q and the frequency f of a 32-kHz quartz tuning fork immersed in liquid \(^4\)He between 0.9 and 3.0 K, over pressures ranging from the saturated vapor pressure to \(\approx \)25 atm. At constant pressure, as a function of temperature, the quality factor and frequency have strong features related to the temperature dependence of the superfluid fraction. At constant temperature, Q depends on the superfluid fraction, while the frequency is a smooth function of pressure. The behavior is explained using a simple hydrodynamic model. The liquid helium viscosity is obtained from measured values of Q, and together with tabulated values of the helium density as a function of pressure and temperature, the frequency shift can be parameterized as a function of temperature and pressure. The observed sensitivity is \(\approx \)7.8 Hz/atm. The quartz tuning fork provides a compact low power method of measuring the pressure in the bulk liquid.