Accession Number:

AD0412726

Title:

AN ELECTRON BEAM EXCITATION TECHNIQUE FOR THE MEASUREMENT OF LOW DENSITIES IN HYPERSONIC SHOCK TUNNEL FLOWS,

Descriptive Note:

Corporate Author:

GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV

Personal Author(s):

Report Date:

1963-06-30

Pagination or Media Count:

16.0

Abstract:

A moderately energetic electron beam 30 kev is used to induce luminescence from the nitrogen molecules in a high speed gas flow. Local gas density may be measured from observation of the electroluminescent intensity. The method is ideally suited to low density hypersonic flows where, because the gas is so tenuous, the tech nique proves highly effective compared to shad owgraph or schlieren instrumentation. In the present case the technique was developed for the measurement of density in a hypersonic shock tunnel. The ability to make accurate, quantita tive measurements of density is useful in prob ing a shock tunnels free stream flow. Also, interesting investigations of the flow in the near wake region of a model may be undertaken using the electron beauthor

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE