INFICON CHC-15 Crystal Holders GC-15 Glass Cell - Manual (Page 17)

CHC-15 CRYSTAL HOLDER & GC-15 GLASS CELL
2.2.5 CRYSTAL THICKNESS
INFICON AT cut, 1-inch diameter crystals are plano-plano. Their physical thickness is determined by a
frequency constant and their final frequency. The frequency constant for an AT cut crystal is 1.668E5
Hz × cm or 65.5 kHz × in. Therefore, the crystal thicknesses for various frequencies are as follows.
5 MHz AT cut thickness = 333 microns (0.013 inch)
6 MHz AT cut thickness = 227 microns (0.0109 inch)
9 MHz AT cut thickness = 185 microns (0.007 inch)
Footnotes
1 Martin, Stephen, et. al., “Effect of Surface Roughness on the Response of Thickness-Shear Mode
Resonators in Liquids”, Anal. Chem., 65 (1993) 2910.
2 Sullivan, C. K. and Guilbault, G.G. “Commercial Quartz Crystal Microbalances- theory and
applications”, Biosensors and Bioelectronics 14 (1999) 663-670.
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