A technique for making detailed measurements of the combustion process in spark ignition and diesel engines, known as cars, (coherent anti-stokes raman scattering), has been developed at Shell research. The article describes the potential of the technique for application to engine studies including temperature and chemical species measurements with good resolution in time and space. The technique is based on two pulsed laser beams with different optical frequencies focused together into an engine through a quartz window. If certain conditions are met, mixing between these two beams occur and a third coherent beam is generated that has the characteristics of laser radiation. This generates a cars spectrum from which chemical species can be identified and concentrations measured. Additionally, as temperature influences the shape of these spectra, this can also be determined. (TRRL)

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  • Corporate Authors:

    Mechanical Engineering Publications Limited

    P.O. Box 24, Northgate Avenue
    Bury St Edmunds, Suffolk IP32 6BW,   England 
  • Authors:
    • Swords, M D
    • Cole, J B
    • Stenhouse, I A
    • Williams, D R
  • Publication Date: 1980-2-3

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 15-17
  • Serial:
    • Volume: 5
    • Issue Number: 1
    • Publisher: Institution of Mechanical Engineers
    • ISSN: 0307-6490

Subject/Index Terms

Filing Info

  • Accession Number: 00316881
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Dec 30 1980 12:00AM