Measuring the Prong Velocity of Quartz Tuning Forks Used to Probe Quantum Fluids
Measuring the Prong Velocity of Quartz Tuning Forks Used to Probe Quantum Fluids
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DOI：
10.1007/s10909-010-0227-y
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发表时间：
2010-10
影响因子：
2
通讯作者：
D. Bradley;P. Crookston;M. J. Fear;S. Fisher;G. Foulds;D. Garg;A. M. Guénault;E. Guise;R. Haley;O. Kolosov;G. Pickett;R. Schanen;V. Tsepelin
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文献类型：
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作者：
D. Bradley;P. Crookston;M. J. Fear;S. Fisher;G. Foulds;D. Garg;A. M. Guénault;E. Guise;R. Haley;O. Kolosov;G. Pickett;R. Schanen;V. Tsepelin
最近，石英音叉已被用来探测量子流体的动力学。对于许多此类测量，了解振动叉尖头的速度幅度非常重要。我们使用不同的技术以百分之几的精度建立了几种基本谐振频率~32 kHz 的商用石英音叉的电气和机械性能之间的关系。速度通常是通过机电校准来推断的，该校准将石英尖头建模为夹紧的矩形悬臂梁。我们使用三种方法测试了这种校准的准确性： 测量叉尖彼此接触的幅度；使用频闪显微镜对移动叉齿进行直接光学测量；以及使用 670 nm 激光操作的迈克尔逊干涉测量技术。所有三种方法都产生一致的结果。发现如此确定的速度比标准机电校准的速度低 10%。
Recently, quartz tuning forks have been used to probe the dynamics of quantum fluids. For many of these measurements it is important to know the velocity amplitude of the tips of the vibrating fork prongs. We have used different techniques to establish, with an accuracy of a few percent, the relationship between the electrical and mechanical properties of several commercial quartz tuning forks with fundamental resonant frequency ∼32 kHz. The velocity is usually inferred from an electro-mechanical calibration that models a quartz prong as a clamped, rectangular cantilever beam. We have tested the accuracy of this calibration using three methods: measurement of the amplitude at which the fork prongs touch each other; direct optical measurement of the moving fork prongs using strobe microscopy; and a Michelson interferometry technique operating with a 670 nm laser. All three methods yield consistent results. The velocity so determined is found to be 10% lower than that of the standard electro-mechanical calibration.