The custom designed 12.5 kHz T-shape QTF is the most performant solution for spectroscopic applications based on Quartz-Enhanced PhotoAcoustic Spectroscopy (QEPAS).

 Geometrical parameters as well as resonance properties of the custom QTF are reported in the following table. Additional information about the QTF and the QEPAS technique can be found here.

Prong Spacing Quartz Crystal Thickness

 QTF full size

 Resonance Frequency (fundamental mode)

Quality Factor
800 μm 250 μm 12.6 mm x 5.2 mm   12.5 kHz 15000