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Prospects for Flow Measurements Based on Spectroscopic Methods

  • Donald Baganoff
Conference paper

Abstract

The shadow, schlieren, and interferometric methods have been very useful in many areas of gas dynamics, particularly for the study of planar or axisymmetric compressible flows. With the development of the laser, the potential exists for the introduction of methods whereby the thermodynamic state of a general three-dimensional nonsteady compressible flow could be routinely measured at an arbitrary point in space. However, all known methods are presently limited by factors which have prevented their common use in general laboratory experiments and wind tunnels. As laser development continues and a wider choice of laser characteristics becomes available, it appears certain that continued research will lead to a routine application of one or more of these approaches. The known methods are reviewed in a general way by introducing a classification which places each into one of three categories. The grouping identifies the basic measurement concept employed, the relationship between the different approaches, their fundamental limitations, and reasons for choosing one approach over another. The motivation for employing laser-induced fluorescence as a diagnostic scheme for measuring density (as well as temperature and velocity) in certain flows is discussed, and the status of research in applying the method to various fluid mechanical problems is reviewed, together with a discussion of the outlook for continued development of the technique.

Keywords

Probe Beam Radiative Lifetime Nozzle Flow Supersonic Nozzle Iodine Molecule 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York Inc. 1986

Authors and Affiliations

  • Donald Baganoff
    • 1
  1. 1.Stanford UniversityStanfordUSA

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