Development of N2 laser-induced fluorescence (LIF) techniques is desirable for probing reacting and non-reacting air flows. However, the absence of N2 absorption spectra accessible to available lasers prevented, until now, the development of such techniques. We identified experimentally an efficient multi-photon, laser-induced N2 ionization process. The resulting ions can serve for temperature measurements or as tracers for velocity measurements in hostile environments or in-flight applications. The ionization path, ion concentration, quenching parameters, and application of a scheme for velocity and temperature measurements were evaluated.

© 1991 Optical Society of America

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription