Fig. 3: Dynamic range of QEMR-PAS.
From: Quartz-enhanced multiheterodyne resonant photoacoustic spectroscopy
a Frequency response curve of the custom QTF. b QEMR-PAS signal as a function of gas concentration. The acetylene concentration levels vary from 40 ppm to 5%. The inset on the right demonstrates the QEMR-PAS linearity at low concentrations from, 40 ppm to 200 ppm
