Contributions of amplitude measurement in QCM sensors

Author

Zhang, Chao ; Feng, Guanping

Author_Institution

Dept. of Precision Instrum. Mech., Tsinghua Univ., Beijing, China

Volume

43

Issue

5

fYear

1996

Firstpage

942

Lastpage

947

Abstract

The characteristics of the amplifier and the feedback loop of a quartz crystal series oscillating circuit are investigated. The fact that the change of the vibration amplitude of the quartz crystal is proportional to the change of its motional resistance is derived. The concept of a characteristic damping coefficient is introduced and the behavior of a quartz crystal vibrating in liquids is analyzed. The experiment shows that the effect of mass loading can be distinguished from that of the liquid damping of a quartz crystal microbalance (QCM) sensor in liquids by simultaneously measuring the amplitude and the frequency change.

Keywords

crystal oscillators; feedback oscillators; microbalances; piezoelectric transducers; quartz; QCM sensors; SiO/sub 2/; amplitude measurement; characteristic damping coefficient; feedback loop; liquid damping; mass loading; quartz crystal microbalance; quartz crystal series oscillating circuit; vibration amplitude; Biosensors; Damping; Feedback circuits; Feedback loop; Frequency measurement; Gas detectors; Immune system; Liquids; Resonant frequency; Sensor phenomena and characterization;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.535498

Filename

535498