The electron beam fluorescence technique in hypersonic aerothermodynamics

Gochberg, Lawrence A.

doi:10.2514/6.1994-2635

Cited by 10 publications

(1 citation statement)

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“…Another spectral study of the fluorescent emission of nitrogen, helium, and nitric oxide in a hypersonic wind tunnel along with an analysis of background noise effects was reported by Price et al (1992). Recent reviews in this field, which include the electron beam technique and species concentration measurement in hypersonic flows, have been written by Dankert et al (1993) and Gochberg (1994). The applicability of relevant methods has also been discussed for hot gases in high enthalpy flows, and at relatively high densities.…”

Section: Introductionmentioning

confidence: 99%

Determination of density and concentration from fluorescent images of a gas flow

2008

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A fluorescent image analysis procedure to determine the distribution of species concentration and density in a gas flow is proposed. The fluorescent emission is due to the excitation of atoms/molecules of a gas that is intercepted by an electron blade. The intensity of the fluorescent light is proportional to the local number density of the gas. When the gas flow is a mixture of different species, this proportionality can be exploited to extract the contribution associated to the species from the spectral superposition acquired by a digital camera. This yields a method that simultaneously reveals species concentrations and mass density of the mixture. The procedure is applied to two under-expanded sonic jets discharged into a different gas ambient -Helium into Argon and Argon into Helium -to measure the concentration and density distribution along the jet axis and across it. A comparison with experimental and numerical results obtained by other authors when observing under-expanded jets at different Mach numbers is made with the density distribution along the axis of the jet. This density distribution appears to be self-similar.

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Section: Introductionmentioning

confidence: 99%