Patent ID: 9113543
Filing Date: 2015-08-18
Classification: H01P,H05H

Abstract:
1. A device for measuring at least one of density, electron temperature and collision frequency of a plasma, comprising: a probe for insertion into the plasma, the probe comprising: a probe head comprising a probe core having mutually isolated electrode regions of opposite polarity and a jacket surrounding the probe core, a balun disposed at a transition between the probe head and an electrically unbalanced high-frequency signal feed, said balun converting electrically unbalanced signals into balanced signals, and the device further comprising: a signal generator connected to the probe shaft and electrically coupling a high-frequency signal into the probe head, and a receiver configured to determine an impulse response to the high-frequency signal coupled by the probe head into the plasma and to calculate from the impulse response the at least one of density, electron temperature and collision frequency of the plasma, wherein the probe comprises a central carrier plate extending through the probe core and the probe shaft, wherein an electrode region of the probe core and a corresponding conductor path associated with the corresponding electrode region are arranged on respective sides of the carrier plate in one-to-one correspondence.