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A Langmuir probe is a device used to determine the electron temperature, electron density, and electric potential of a plasma. It works by inserting one or more electrodes into a plasma, with a constant or time-varying electric potential between the various electrodes or between them and the surrounding vessel.
Langmuir probe theory consists in predicting by use of the plasma parameters, what the electrical current to a conducting probe should be as a function of the probe voltage.
The Langmuir Probe (LMP) is an onboard scientific instrument of the satellite, its objective is to determine the parameters of the plasma in the upper regions of the Earth’s atmosphere (i.e., ionosphere).
Basics of Langmuir probes; saturation current, swept probes, double and triple probes.
I give several simple examples of model Langmuir probe current-voltage I-V characteristics that help students learn how to interpret real I-V characteristics obtained in a plasma. Students can also create their own Langmuir probe I-V characteristics using a program with the plasma density,
Of all the ways to measure a plasma, the Langmuir probe is probably the simplest, since it consists of sticking a wire into the plasma and measuring the current to it at various applied voltages.
In this short review is introduced the elementary theory of collecting Langmuir probes in spherical and cylindrical geometries. The classical results for either repelled and at-tracted charges are deduced and the different approximations and limits of application are discussed with special insight in laboratory and practical applications.
create their own Langmuir probe I-V characteristics using a program with the plasma density, plasma potential, electron temperature, ion temperature, and probe area as input parameters. Some examples of Langmuir probe I-V characteristics obtained in laboratory plasmas are presented and analyzed.
In this chapter, we provide a simple treatment of the formation and structure of the plasma sheath and discuss a simple but very useful device, called the Langmuir probe, which is commonly used to measure electron density and temperature.
Langmuir Probes stand as a pivotal instrument in the field of plasma physics, providing a direct method to diagnose and study plasma environments. Named after Irving Langmuir, who introduced the technique in the 1920s, these probes offer insights into plasma characteristics such as electron density, electron temperature, and plasma potential.