## ultrasonic detector

in gas chromatography
https://doi.org/10.1351/goldbook.U06549
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 @T06299@ detectors are not sufficiently sensitive. The detection threshold is of the order of $$0.1\ \text{ppmv}$$. The linear dynamic range is of the order of $$10^{3}$$.
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2192 [Terms] [Paper]