Tips for QCL Carbonyl Sulfide
Other researchers report ambient pressure effects for some QCL systems.
L. Kooijmans has used a separate CO2 analyzer to find a leak in the sample cell of the QCL by monitoring the analyzer exhaust.
W. Sun suggests using a buffer volume when doing chamber measurements in the canopy, because turbulence may cause ambient COS concentration to fluctuate rapidly.
Four companies make commercially available units that have been deployed in the field:
Aerodyne (Wingate, Commane, Seibt, Maseyk, Berry, Yakir, Wohlfahrt, Kooijmans)
Los Gatos Research (Still, Berkelhammer, LaFranchi)
Aeris Technologies (Meredith, Commane, Whelan). This last one is much less expensive (36k) but has yet to produce presentable data. We are hopeful.
MIRO Analytics (no published data yet) produces a laser that is around 220k but measures more compounds.