How to Calculate electron temperature of Arc Plasma?

In summary, calculating the electron temperature of arc plasma involves measuring the plasma's emission spectrum and analyzing specific spectral lines. Techniques such as Langmuir probes or optical emission spectroscopy can be employed. The electron temperature can be inferred from the intensity ratios of selected lines, often using Boltzmann plots or Saha equations to relate the observed data to temperature. Accurate measurements require consideration of factors like plasma density and pressure, along with corrections for non-ideal conditions.
  • #1
akansh_karthik_1
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TL;DR Summary
How to calculate the electron temperature (Te) of an arc plasma with moving through air with current I, and voltage V
I am trying to calculate the spitzer resistivity of an arc discharge plasma and I have not been able to figure out how to calculate electron temperature (Te). What is the formula / method of getting this value? How does electron temperature vary in relation to current and voltage moving through the plasma.
 
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  • #2
What sources have you been looking through? I did a Google search on electron temperature of plasma arc and got lots of good hits. One of the first ones was a Wikipedia article on Plasma Arc Welding.
 
  • #3
Most of the sources that I have found talk about measuring electron temperature through instruments not through some sort of mathematical approach or law.
 

FAQ: How to Calculate electron temperature of Arc Plasma?

1. What is electron temperature in arc plasma?

Electron temperature in arc plasma refers to the average kinetic energy of the electrons in the plasma. It is a crucial parameter that influences the plasma's electrical properties, chemical reactivity, and overall behavior. Electron temperature is typically measured in electron volts (eV) and is an indicator of how energetic the electrons are within the plasma environment.

2. Why is it important to calculate the electron temperature of arc plasma?

Calculating the electron temperature of arc plasma is important because it helps in understanding the plasma's physical and chemical properties. It affects processes such as ionization, excitation, and the overall efficiency of energy transfer in applications like welding, material processing, and plasma diagnostics. Knowledge of electron temperature also aids in optimizing plasma conditions for various industrial applications.

3. What methods can be used to calculate electron temperature in arc plasma?

Several methods can be used to calculate electron temperature in arc plasma, including the following: 1. Langmuir probe measurements, where a probe is inserted into the plasma to measure current-voltage characteristics.2. Spectroscopic techniques, which analyze the emission spectra of the plasma to determine electron temperature based on the distribution of spectral lines.3. The use of numerical models and simulations that incorporate fluid dynamics and kinetic theory to estimate electron temperature based on plasma parameters.

4. How do I use a Langmuir probe to measure electron temperature?

To use a Langmuir probe for measuring electron temperature, follow these steps: 1. Insert the probe into the arc plasma and apply a voltage sweep to it.2. Measure the resulting current as a function of the applied voltage.3. Analyze the current-voltage curve to identify the electron saturation current and the characteristic knee of the curve, which provides information about the electron density and temperature.4. Use the derived parameters to calculate the electron temperature using the appropriate equations, typically involving the slope of the curve in the electron current region.

5. What are the typical values of electron temperature in arc plasma?

Typical values of electron temperature in arc plasma can range from a few eV to several tens of eV, depending on the type of arc and the operating conditions. For example, in a carbon arc, electron temperatures may be around 2-5 eV, while in a tungsten inert gas (TIG) arc, temperatures can reach up to 10-20 eV. These values can vary based on factors such as the arc current, gas composition, and pressure.

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