title: Detection of benzene and toluene gases using a midinfrared continuous-wave external cavity quantum cascade laser at atmospheric pressure.
abstract: We demonstrate the application of a commercially available widely tunable continuous-wave external cavity quantum cascade laser as a spectroscopic source for the simultaneous detection of multiple gases. We measured broad absorption features of benzene and toluene between 1012 and 1063 cm(-1) (9.88 and 9.41 microm) at atmospheric pressure using an astigmatic Herriott multipass cell. Our results show experimental detection limits of 0.26 and 0.41 ppm for benzene and toluene, respectively, with a 100 m path length for these two gases.
authors.affiliation: Electrical and Computer Engineering Department, University of Alberta, Edmonton, Alberta, Canada T6G 2V4. ihor@ece.ualberta.ca
authors.forename: Ihor
authors.initials: I
authors.lastname: Sydoryk
authors.forename: Alan
authors.initials: A
authors.lastname: Lim
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Jäger
authors.forename: John
authors.initials: J
authors.lastname: Tulip
authors.forename: Matthew T
authors.initials: MT
authors.lastname: Parsons