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A laser deflection technique for sensitive measurements of a reduced‐density channel in neutral gas

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2 Author(s)
Greenspan, M.A. ; McDonnell Douglas Research Laboratories, St. Louis, Missouri 63166 ; Reddy, K.V.

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The radial profile of neutral gas density has been measured for a reduced‐density channel in 2.7‐kPa (20 Torr) air produced by an electrical discharge. Deflection by the channel of a He‐Ne laser is measured by a sensitive position detector, and the density profile is unfolded using an Abel inversion. Density changes of ∼1017/cm3 in air can be measured by this means.

Published in:

Applied Physics Letters  (Volume:40 ,  Issue: 7 )