Improved electronic interfaces for AT-cut quartz crystal microbalance sensors under variable damping and parallel capacitance conditions

被引：17

作者：

Arnau, A. ^{[1
]}

Garcia, J. V. ^{[1
]}

Jimenez, Y. ^{[1
]}

Ferrari, V. ^{[2
,3
]}

Ferrari, M. ^{[2
,3
]}

机构：

[1] Univ Politecn Valencia, Dept Ingn Elect, Grp Fenomenos Ondulatorios, Valencia 46022, Spain

[2] Univ Brescia, Dipartimento Elettron & Automat, I-25123 Brescia, Italy

[3] Univ Brescia, INFM, I-25123 Brescia, Italy

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2008年 / 79卷 / 07期

关键词：

D O I：

10.1063/1.2960571

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A new configuration of automatic capacitance compensation (ACC) technique based on an oscillatorlike working interface, which permits the tracking of the series resonant frequency and the monitoring of the motional resistance and the parallel capacitance of a thickness-shear mode quartz crystal microbalance sensor, is introduced. The new configuration permits an easier calibration of the system which, in principle, improves the accuracy. Experimental results are reported with 9 and 10 MHz crystals in liquids with different parallel capacitances which demonstrate the effectiveness of the capacitance compensation. Some frequency deviations from the exact series resonant frequency, measured by an impedance analyzer, are explained by the specific nonideal behavior of the circuit components. A tentative approach is proposed to solve this problem that is also common to previous ACC systems. (c) 2008 American Institute of Physics.

引用

页数：12

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