The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Gas analysis within remote porous targets using LIDAR multi-scatter techniques

På svenska

Author

  • Zuguang Guan
  • Märta Lewander
  • Rasmus Grönlund
  • Hans Lundberg
  • Sune Svanberg

Summary, in English

Light detection and ranging (LIDAR) experiments are normally pursued for range resolved atmospheric gas measurements or for analysis of solid target surfaces using fluorescence of laser-induced breakdown spectroscopy. In contrast, we now demonstrate the monitoring of free gas enclosed in pores of materials, subject to impinging laser radiation, employing the photons emerging back to the surface laterally of the injection point after penetrating the medium in heavy multiple scattering processes. The directly reflected light is blocked by a beam stop. The technique presented is a remote version of the newly introduced gas in scattering media absorption spectroscopy (GASMAS) technique, which so far was pursued with the injection optics and the detector in close contact with the sample. Feasibility measurements of LIDAR-GASMAS on oxygen in polystyrene foam were performed at a distance of 6 m. Multiple-scattering induced delays of the order of 50 ns, which corresponds to 15 m optical path length, were observed. First extensions to a range of 60 m are discussed. Remote observation of gas composition anomalies in snow using differential absorption LIDAR (DIAL) may find application in avalanche victim localization or for leak detection in snow-covered natural gas pipelines. Further, the techniques may be even more useful for short-range, non-intrusive GASMAS measurements, e.g., on packed food products.

Department/s

Publishing year

2008

Language

English

Pages

657-663

Publication/Series

Applied Physics B

Volume

93

Issue

2-3

Document type

Journal article

Publisher

Springer

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • Df
  • 07
  • Wt
  • 42
  • 68

Status

Published

ISBN/ISSN/Other

  • ISSN: 0946-2171