Accession Number:

AD0603668

Title:

THE APPLICATION OF LANGMUIR PROBE TECHNIQUES TO FLOWING IONIZED GASES,

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s):

Report Date:

1964-06-15

Pagination or Media Count:

118.0

Abstract:

A detailed theoretical and experimental investigation regarding the use of Langmuir probe techniques in a flowing partially ionized gas was carried out. Both free molecule and stagnation point probes were considered. The analysis is restricted to the determination of ion density from the saturated ion current, and the determination of electron temperature from the rate of change of electron current with probe potential. Numerical results are presented for argon, along with the results of a series of experiments conducted in an arc heated supersonic low density wind tunnel. It is concluded that the ion density can be measured accurately with a stagnation point probe, or with a plane free molecule probe surrounded by a guard ring. The electron temperature can be measured accurately with a guarded plane free molecule probe, or with a cylindrical free molecule probe aligned with the flow. Measurements made in flowing gases with other types of Langmuir probes are subject to certain consistent errors. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE