title: High sensitivity trace gas detection by cantilever-enhanced photoacoustic spectroscopy using a mid-infrared continuous-wave optical parametric oscillator.
abstract: Highly sensitive cantilever-enhanced photoacoustic detection of hydrogen cyanide and methane in the mid-infrared region is demonstrated. A mid-infrared continuous-wave frequency tunable optical parametric oscillator was used as a light source in the experimental setup. Noise equivalent detection limits of 190 ppt (1 s) and 65 ppt (30 s) were achieved for HCN and CH(4), respectively. The normalized noise equivalent absorption coefficient is 1.8 × 10(-9) W cm(-1) Hz(-1/2).
authors.affiliation: Laboratory of Physical Chemistry, Department of Chemistry, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Finland.
authors.forename: Jari
authors.initials: J
authors.lastname: Peltola
authors.forename: Markku
authors.initials: M
authors.lastname: Vainio
authors.forename: Tuomas
authors.initials: T
authors.lastname: Hieta
authors.forename: Juho
authors.initials: J
authors.lastname: Uotila
authors.forename: Sauli
authors.initials: S
authors.lastname: Sinisalo
authors.forename: Markus
authors.initials: M
authors.lastname: Metsälä
authors.forename: Mikael
authors.initials: M
authors.lastname: Siltanen
authors.forename: Lauri
authors.initials: L
authors.lastname: Halonen
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000032:analysis* / Q000737:chemistry; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D008832:Microchemistry / Q000295:instrumentation*; D009991:Oscillometry / Q000295:instrumentation*; D061088:Photoacoustic Techniques / Q000295:instrumentation*; D013055:Spectrophotometry, Infrared / Q000295:instrumentation*
chemical_list: D005740:Gases