X-ray instrumentation for density measurements in a supersonic flow field

John Dimeff, Ralph K. Hallett, Jr., C. Frederick Hansen
Dec 1952

An X-ray beam is essentially undeviated while traversing a short path in the air. The wave lengths of approximately 6 Angstroms, sufficient absorption occurs in air to allow satisfactory measurement of densities at a total density as low as approximately 2 X10(-5) g per cubic centimeter. An instrument based on this principle is described.

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