Optical methods involving light scattering for measuring size and concentration of condensation particles in supercooled hypersonic flow

Enoch J. Durbin
naca-tn-2441
Aug 1951


Optical methods involving light scattering for measuring the size and concentration of condensation particles in supercooled hypersonic air flow are discussed. Two methods based on scattered-light measurements and on transmitted-light measurements are given which can be used for obtaining quantitative measurements provided (1) that steady-state conditions can be achieved during the time required for the measurement of light intensity, (2) that the condensation particles are approximately spherical in shape and essentially uniform in size, and (3) that the index of refraction of the condensation particles is known approximately.

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