Measurements of Electrical Conductivity of MHD Plasmas with Four-Pin Probes.

摘要

This work describes the development of a four-pin probe and associated electronic instrumentation for making time and space resolved measurements of electrical conductivity in MHD plasma flows. Measurements were made in 2000 K atmospheric-pressure potassium-seeded (0.1% by weight) argon flowing at velocities between 10 and 100 meters/sec. The results show a dependence of indicated conductivity on flow speed and probe orientation, so that calibration is necessary for high accuracy absolute conductivity determinations. The probe is well suited for time and space resolved relative conductivity fluctuation measurements, and for continuous display of time-averaged indicated conductivity. (Author)