Chirped laser dispersion spectroscopy for remote open-path trace-gas sensing

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...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2012-12, Vol.12 (12), p.16466-16481
Main Authors: Nikodem, Michal, Wysocki, Gerard
Format: Article
Language:English
Subjects:
Detection
Dispersions
Environmental Monitoring
Equipment Design
Gases
Gases - chemistry
Gases - isolation & purification
Humans
laser spectroscopy
Lasers
Lasers, Gas
Light
Nitrous oxide
Nitrous oxides
optical dispersion spectroscopy
Prototypes
quantum cascade lasers
Quantum Theory
Remote sensing
Robustness
Sensors
Spectroscopy
Spectrum Analysis
Telemetry
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s121216466