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

Michal Nikodem, Gerard Wysocki

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)16466-16481
Number of pages16
JournalSensors (Switzerland)
Issue number12
StatePublished - Dec 2012

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Instrumentation
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering
  • Biochemistry


  • Laser spectroscopy
  • Optical dispersion spectroscopy
  • Quantum cascade lasers
  • Remote sensing


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