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Updated: Feb 8, 2026

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
Published on: May 25, 2021
Note: Measurement of the cathode layer thickness in glow discharges with a Langmuir probe
Hao Wang1, Xinyu Hou1, Xiaobing Zou1
1Department of Electrical Engineering, Tsinghua University, Beijing 100084, China.
Abstract:
A method using a Langmuir probe to determine the thickness of the cathode layer for a glow discharge is developed. The method is based on the phenomenon that the curve of the voltage-current characteristics changes in shape as the Langmuir probe moves from the positive column into the cathode layer. The method was used to measure the thicknesses of the cathode layer in the normal glow discharges of argon and air with the cathodes made from stainless steel and aluminum. The results are in good agreement with those given in a book of gas discharge.
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