Burda Ioan
Physics Department, Babes-Bolyai University, 400084 Cluj-Napoca, Romania.
Sensors (Basel). 2022 Feb 15;22(4):1506. doi: 10.3390/s22041506.
The impedance quartz crystal microbalance (QCMI) is a versatile and simple method for making accurate measurements of the QCM sensor electrical parameters. The QCM sensor provides access to the physical parameters of the sample beyond the mass per unit area by measuring the dissipation factor, or another equivalent, ensuring a detailed analysis of the surface. By establishing a cooperative relationship between custom software and modular configurable hardware we obtain a user-defined measurement system that is called a virtual instrument. This paper aims primarily to improve and adapt existing concepts to new electronics technologies to obtain a fast and accurate virtual impedance analyzer (VIA). The second is the implementation of a VIA by software to cover a wide range of measurements for the impedance of the QCM sensor, followed by the calculation of the value of lumped electrical elements in real time. A method for software compensation of the parallel and stray capacitance is also described. The development of a compact VIA with a decent measurement rate (192 frequency points per second) aims, in the next development steps, to create an accurate impedance analyzer for QCM sensors. The experimental results show the good working capacity of QCMI based on VIA.
阻抗石英晶体微天平（QCMI）是一种用于精确测量QCM传感器电学参数的通用且简单的方法。通过测量耗散因数或其他等效参数，QCM传感器能够获取超出单位面积质量的样品物理参数，从而确保对表面进行详细分析。通过在定制软件和模块化可配置硬件之间建立合作关系，我们获得了一个称为虚拟仪器的用户定义测量系统。本文主要旨在改进现有概念并使其适应新的电子技术，以获得快速且准确的虚拟阻抗分析仪（VIA）。其次是通过软件实现VIA，以涵盖对QCM传感器阻抗的广泛测量，随后实时计算集总电学元件的值。还描述了一种用于并联和杂散电容软件补偿的方法。开发具有良好测量速率（每秒192个频率点）的紧凑型VIA，其目标是在接下来的开发步骤中创建一个用于QCM传感器的精确阻抗分析仪。实验结果表明基于VIA的QCMI具有良好的工作能力。
