Pulsed quantum-cascade laser-based sensor for trace-gas detection of carbonyl sulfide.
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.
Wysocki
Gerard
G
Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77251, USA. gerardw@rice.edu
McCurdy
Matt
M
So
Stephen
S
Weidmann
Damien
D
Roller
Chad
C
Curl
Robert F
RF
Tittel
Frank K
FK