Diagnostics of flight plasma by conduction probes is considered. The geometry of the probes and the principle of operation are discussed. An expression for plasma conductivity is given and a correction factor is introduced for the final length of the probe electrodes. The appearance of a melt film on the end surface of the electrode insulator is noted, which is a conductive medium and therefore introduces significant errors into probe measurements. It is proposed to additionally use conduction probes to measure the conductivity of the melt film. The combined use of plasma and melt conduction probes ensures that the influence of the insulator melt on the probe measurement results is eliminated. The results of calculations for measuring plasma electron concentrations depending on the properties of the plasma and melt and the geometry of the probes are presented. The results show that the conductivity sensors provide acceptable accuracy in measuring the electron concentration of the flight plasma.
Author
(s) Details
Mikhailov V.
St. Petersburg State University of Aerospace Instrumentation, Russia.
Please see the book here:- https://doi.org/10.9734/bpi/crpps/v8/4587
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