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Electron Density Determination by Means of Tuneable 50 GHz and 150 GHz Interferometers
Author(s) -
Ehlbeck J.,
Rackow K.,
Andrasch M.,
Weltmann K.D.
Publication year - 2011
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201000069
Subject(s) - astronomical interferometer , interferometry , microwave , electron density , plasma , electron , materials science , measure (data warehouse) , atomic physics , plasma diagnostics , physics , optics , quantum mechanics , database , computer science
The electron density is one of the most important parameters to characterise the properties of plasma. Among several other methods microwave interferometry is a well known technique. Two approaches at different fre‐quencies are given to show the application of microwave interferometers to practical problems. An interferometer working at a frequency of 150 GHz is used to measure the electron density of an atmospheric pressure microwave torch and the time resolved electron densities in the vicinity of the electrode of commercial fluorescent lamps. A 50 GHz interferometer set up is used to measure the electron density in an inductive coupled plasma at low pressures. The parameters pressure and rf‐power are varied (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)