Sound is generated in a reference cell and a measuring cell. An eluted component passing
through the measuring cell changes the velocity of sound in the cell. This change
is detected by a phase shift of acoustic signals between the two cells. This detector
is usually employed for inorganic gases in the region where
thermal conductivity detectors are not sufficiently sensitive. The detection threshold is of the order
of
.
The linear dynamic range is of the order of
.
Source:
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2192