title: Pulsed quantum-cascade laser-based sensor for trace-gas detection of carbonyl sulfide.
abstract: 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 (1sigma) 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 Herriott cell of 36-m optical path length and 0.4-s acquisition time.
authors.affiliation: Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77251, USA. gerardw@rice.edu
authors.forename: Gerard
authors.initials: G
authors.lastname: Wysocki
authors.forename: Matt
authors.initials: M
authors.lastname: McCurdy
authors.forename: Stephen
authors.initials: S
authors.lastname: So
authors.forename: Damien
authors.initials: D
authors.lastname: Weidmann
authors.forename: Chad
authors.initials: C
authors.lastname: Roller
authors.forename: Robert F
authors.initials: RF
authors.lastname: Curl
authors.forename: Frank K
authors.initials: FK
authors.lastname: Tittel