A MEASUREMENT OF THE ELECTRICAL CONDUCTIVITY OF IONIZED GASES
Rept. for 1 Jan-Aug 1960
TRW SPACE TECHNOLOGY LABS LOS ANGELES CA
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Two methods were used in attempts to measure the electrical conductivity of various substances, in particular that of a plasma jet. Transients flowing in a system of coupled circuits were subtracted in such a way that the difference signal is due only to the presence of the conducting material. The amplitude and time decay of the signal are calculable fuctions of the conductivity. This method worked well on graphite, but was too insensitive for aqueous salt NaCl solutions. Therefore, it cannot easily be applied to the case of an air arc jet exhaust. The steady-state AC measurement technique was tried next. Resonance properties of a coil coupled to the conducting material were measured and compared to the corresponding properties of the same coil in the absence of the conducting substance. This method was used on salt water in the frequency range of 1-10 mc. It was found to be sufficiently sensitive that the accuracy of the conductivity measurement was expected to be about 10. Two problems were encountered, however, that were not solved.
- Plasma Physics and Magnetohydrodynamics
- Physical Chemistry