A laser ion time-of-flight technique for velocity measurements using N2(+) tracers has been demonstrated. The ions are formed by a multiphoton interaction with the third harmonic of a Nd:YAG laser and are detected by a negatively biased ion probe. In air flows with positive probe bias, negative ions, possibly O2(-) formed by attachment with free electrons, were detected and could also be used as tracers. The lifetime of the ions is controlled by charge recombination. At atmospheric conditions and after a delay of 600 microseconds, ion signal was still above background noise level. Measurements of flow velocities in both a low-speed freejet and in the flame of a propane-air torch are presented. Reduced flight time in high-speed flows can produce even higher signals.


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    Titel :

    Laser ion time-of-flight velocity measurements using N(2+) tracers


    Weitere Titelangaben:

    Strömungsmessung am und im Brenner mittels Laser-Ionen Zeitmessungen mit Stickstoffdioxidindikatoren


    Beteiligte:
    Ress, J.M. (Autor:in) / Laufer, G. (Autor:in) / Krauss, R.H. (Autor:in)

    Erschienen in:

    AIAA Journal ; 33 , 2 ; 296-301


    Erscheinungsdatum :

    1995


    Format / Umfang :

    8 Seiten, 8 Bilder, 22 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





    Laser ion time-of-flight velocity measurements using N2(+) tracers

    Ress, James M. / Laufer, Gabriel / Krauss, Roland H. | AIAA | 1995


    Laser ion time-of-flight (LITOF) velocity measurements using N2(+) tracers

    Ress, James / Laufer, Gabriel / Krauss, Roland | AIAA | 1994


    Laser Ion Time-of-Flight (LITOF) Velocity Measurements Using N2- Tracers

    Ress, J. M. / Laufer, G. / Krauss, R. H. et al. | British Library Conference Proceedings | 1994


    Laser Ion Time-of-Flight (LITOF) Velocity Measurements Using N^+~2 Tracers

    Ress, J. M. / Laufer, G. / Krauss, R. H. et al. | British Library Conference Proceedings | 1994