Instantaneous, two-dimensional, spontaneous Raman measurements of hydrogen number density in a laminar jet using an intra-cavity configuration

Dimitrios C. Kyritsis, Philip G. Felton, Frediano V. Bracco

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In view of the increasing importance of hydrogen as a fuel, we are presenting a novel experimental technique that allows for two-dimensional (2D), spontaneous Raman hydrogen concentration measurements in optically accessible enclosures. The novelty of the technique lies in that the actual experiment takes place in a laser cavity, which significantly enhances the inherently weak hydrogen Raman signal. Quantitative, 2D measurements of hydrogen number density were performed at elevated pressure by inserting a pressurised vessel in the cavity of a flashlamp-pumped dye laser. Particular emphasis is placed on the determination of the data accuracy of this technique, which is inherently noisy because of the weakness of the Raman signal. The measurements are compared with the results of direct numerical simulation for a laminar jet. The problems of determining accurately the position and the intensity profile of the laser sheet are addressed. A minimum number density of hydrogen that can be detected with an acceptable signal-to-noise ratio, for a 520-μm resolution, was determined.

Original languageBritish English
Pages (from-to)174-189
Number of pages16
JournalInternational Journal of Alternative Propulsion
Volume1
Issue number2-3
DOIs
StatePublished - 2007

Keywords

  • hydrogen
  • intra-cavity
  • laminar jet
  • laser diagnostics
  • Raman imaging

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