Chapter

The Quartz Crystal Microbalance in Soft Matter Research

Part of the series Soft and Biological Matter pp 169-189

Date:

Energy Trapping and Its Consequences

  • Diethelm JohannsmannAffiliated withInstitute of Physical Chemistry, Clausthal University of Technology Email author 

* Final gross prices may vary according to local VAT.

Get Access

Abstract

Most quartz resonators apply energy trapping. By giving the electrodes the shape of a keyhole, the acoustic thickness of the plate is made larger in the center than at the rim. Such a plate can be viewed as an acoustic cavity, where the surfaces are shaped such that they focus the acoustic energy to the center. Energy trapping has numerous consequences, among them the flexural contributions to the vibration pattern, which lead to the emission of compressional waves.