title: Chirped laser dispersion spectroscopy for remote open-path trace-gas sensing.
abstract: In this paper we present a prototype instrument for remote open-path detection of nitrous oxide. The sensor is based on a 4.53 μm quantum cascade laser and uses the chirped laser dispersion spectroscopy (CLaDS) technique for molecular concentration measurements. To the best of our knowledge this is the first demonstration of open-path laser-based trace-gas detection using a molecular dispersion measurement. The prototype sensor achieves a detection limit down to the single-ppbv level and exhibits excellent stability and robustness. The instrument characterization, field deployment performance, and the advantages of applying dispersion sensing to sensitive trace-gas detection in a remote open-path configuration are presented.
authors: Electrical Engineering Department, Princeton University, Princeton, NJ 08540, USA.
authors: Michal
authors: M
authors: Nikodem
authors: Gerard
authors: G
authors: Wysocki
mesh_terms: D004784:Environmental Monitoring; D004867:Equipment Design; D005740:Gases / Q000737:chemistry / Q000302:isolation & purification*; D006801:Humans; D007834:Lasers; D054020:Lasers, Gas; D008027:Light; D011789:Quantum Theory; D013057:Spectrum Analysis; D013686:Telemetry
chemical_list: D005740:Gases