Optical Diagnostics in Rarefied Flows

Taran, J. P.

doi:10.1016/s1000-9361(11)60294-x

Cited by 1 publication

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“…In these flows, nonequilibrium may be produced by rapid supersonic expansion of a high-temperature flow heated in a shock tube used as a nozzle plenum, by a high-power electric discharge, or by a strong shock (either a propagating shock wave in a shock tube or a stationary shock standing in a supersonic test section). An overview of CARS measurements in hypersonic flows is given by Taran [53], and a comprehensive review of the use of CARS spectroscopy in a more general field of reacting flows is given by Roy et al [54].…”

Section: Vibrational Cars: Vibrational and Rotational Temperatures Inmentioning

confidence: 99%

Coherent anti-Stokes Raman scattering and spontaneous Raman scattering diagnostics of nonequilibrium plasmas and flows

Lempert

Adamovich

2014

J. Phys. D: Appl. Phys.

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The paper provides an overview of the use of coherent anti-Stokes Raman scattering (CARS) and spontaneous Raman scattering for diagnostics of low-temperature nonequilibrium plasmas and nonequilibrium high-enthalpy flows. A brief review of the theoretical background of CARS, four-wave mixing and Raman scattering, as well as a discussion of experimental techniques and data reduction, are included. The experimental results reviewed include measurements of vibrational level populations, rotational/translational temperature, electric fields in a quasi-steady-state and transient molecular plasmas and afterglow, in nonequilibrium expansion flows, and behind strong shock waves. Insight into the kinetics of vibrational energy transfer, energy thermalization mechanisms and dynamics of the pulse discharge development, provided by these experiments, is discussed. Availability of short pulse duration, high peak power lasers, as well as broadband dye lasers, makes possible the use of these diagnostics at relatively low pressures, potentially with a sub-nanosecond time resolution, as well as obtaining single laser shot, high signal-to-noise spectra at higher pressures. Possibilities for the development of single-shot 2D CARS imaging and spectroscopy, using picosecond and femtosecond lasers, as well as novel phase matching and detection techniques, are discussed. 45 I 2

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Section: Vibrational Cars: Vibrational and Rotational Temperatures Inmentioning

confidence: 99%