基于扭转压电谐振器的石英晶体微天平。
Quartz crystal microbalance based on torsional piezoelectric resonators.
作者信息
Bücking W, Du B, Turshatov A, König A M, Reviakine I, Bode B, Johannsmann D
机构信息
Institute of Physical Chemistry, Clausthal University of Technology, Arnold-Sommerfeld-Strasse 4, D-38678 Clausthal-Zellerfeld, Germany.
出版信息
Rev Sci Instrum. 2007 Jul;78(7):074903. doi: 10.1063/1.2756740.
A quartz crystal microbalance (QCM) is described, which is based on a torsional resonator, rather than a conventional thickness-shear resonator. Typical applications are measurements of film thickness in the coating industry and monitoring of biofouling. The torsional QCM is about a factor of 100 less sensitive than the conventional QCM. On the other hand, it can probe film thicknesses in the range of hundreds of microns, which is impossible with the conventional QCM due to viscoelastic artifacts. Data acquisition and data analysis proceed in analogy to the conventional QCM. An indicator of the material's softness can be extracted from the bandwidth of the resonance. Within the small-load approximation, the frequency shift is independent of whether the sample is applied to the face or to the side of the cylinder. Details of the geometry matter if the viscoelastic properties of the sample are of interest.
本文描述了一种基于扭转谐振器而非传统厚度剪切谐振器的石英晶体微天平（QCM）。其典型应用包括涂层行业中薄膜厚度的测量以及生物污垢的监测。扭转式QCM的灵敏度比传统QCM低约100倍。另一方面，它能够探测数百微米范围内的薄膜厚度，而传统QCM由于粘弹性伪像无法做到这一点。数据采集和数据分析过程与传统QCM类似。可以从共振带宽中提取材料柔软度的指标。在小负载近似范围内，频率偏移与样品是施加在圆柱体表面还是侧面无关。如果对样品的粘弹性特性感兴趣，几何形状的细节就很重要。
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