A CAVITY RINGDOWN SPECTROSCOPY MERCURY CONTINUOUS EMISSION MONITOR

摘要

Work on the Cavity Ring-Down (CRD) mercury spectrometer this past quarter concentrated on the actual detection of mercury and the beginning of flue gas interference testing. After obtaining the initial mercury signal detection was done at various pressures and concentrations. The Alexandrite laser system used for the CRD spectrometer has a narrow enough linewidth to spectrally resolve the isotopic structure of mercury. This includes both isotopic frequency shifts as well as hyperfine splittings due to a couple of the odd isotopes of mercury. Initial flue gas inteferent testing concentrated on SO{sub 2}, which is expected to cause the greatest interference with mercury detection due to its absorption of ultra-violet light in the same region as that of the mercury atomic line.