title: Near-infrared tunable diode laser spectrometer for the remote sensing of vehicle emissions.
abstract: A near-infrared diode laser-based spectrometer has been designed and built for the remote sensing of vehicle emissions. It detects carbon monoxide and carbon dioxide absorptions around 1580 nm and can provide the ratio CO/CO(2) for vehicle exhaust studies. The system is battery powered and is designed to sit unobtrusively at the side of the road. The optics and electronics of the system is described and preliminary results are presented from field trials. Extensions to the spectrometer in terms of sensitivity by detection of the more intense first overtone of carbon monoxide around 2320 nm are described, in addition to further work on other species of interest.
authors.affiliation: Department of Chemical and Biological Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK.
authors.forename: S
authors.initials: S
authors.lastname: Barrass
authors.forename: Y
authors.initials: Y
authors.lastname: Gérard
authors.forename: R J
authors.initials: RJ
authors.lastname: Holdsworth
authors.forename: P A
authors.initials: PA
authors.lastname: Martin
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis; D002248:Carbon Monoxide / Q000032:analysis; D007834:Lasers; D008697:Methane / Q000032:analysis; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation*; D013997:Time Factors; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D001335:Vehicle Emissions; D002245:Carbon Dioxide; D002248:Carbon Monoxide; D008697:Methane