Simultaneous exhaled carbonyl sulfide (OCS) and carbon dioxide concentration measurements in human breath are demonstrated with a compact pulsed quantum-cascade laser-based gas sensor. We achieved a noise-equivalent sensitivity (1σ) of 1.2 parts per billion by measuring a well-isolated OCS P(11) absorption line in the v3 band at 2057.6 cm-1 using an astigmatic Harriott cell of 36-m optical path length and 0.4-s acquisition time.
All Science Journal Classification (ASJC) codes
- Engineering (miscellaneous)
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering