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Langmuir probe data analysis code

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24 Mar 2008 (Updated )

four parameters fitting of Langmuir I-V probe data

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Description

A computer code for plasma Langmuir probe analysis is presented here. The code uses a four parameters fitting method to deduce plasma properties including the ion and electron saturation currents, plasma potential, plasma electron temperature, the electron energy distribution function EEDF. Full simple instructions are given in the pdf file. No need of prior knowledge of MATLAB programming is assumed. The code is compatible with any MATLAB version. If you are working in plasma physics, please give me your feedback

Required Products Curve Fitting Toolbox
MATLAB release MATLAB 6.5 (R13)
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Comments and Ratings (5)
12 Apr 2013 Allen

Appears to work in R2011b if you merely take the transpose of one of the input matrices (I transposed "I" for the example code). The fit function requires matching sizes, with them opposing each other, the code does not complete.

09 Apr 2013 Allen

Moving "end" to the end of the function, I get the following error for fitting:

??? Error using ==> nlinfit at 126
MODELFUN should return a vector of fitted values the same length as Y.

Error in ==> Analyze_Langmuir2 at 16
a=nlinfit(V,I/H,'langmuir',a)

09 Apr 2013 Allen

The example code produces the following error:

??? Error: File: Analyze_Langmuir.m Line: 80 Column: 1
This statement is not inside any function.
(It follows the END that terminates the definition of the function
"Analyze_Langmuir".)

using Matlab R2011a

17 Jul 2008 Qais Algwari

It is an excellent work. I hope from Dr.Azooz do develop this work to be a full automatic EEDF calculation. I means to calculate the plasma potention computerized. I think it is easy do that.
GOOD LUCK

24 Apr 2008 Ying Wu

Software is user friendly, and author is very quick to respond to emails. I feel there should be an added option to enter in the probe area so that the plasma density can be calculated as well.

Updates
04 Mar 2013

The updated software now does more thing in automatic way it also calculates the electron and ion saturation currents, the plasma potential, the flouting potential, the ion and electron number densities, and the plasma electron temperature

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