Talk:Langmuir probe

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I am pleased to see someone finally taking an interest in this article. Nevertheless I am not entirely happy with the recent expansion of Langmuir probe#Triple probe. It repeats some of the derivations already given in the sections on single probes and double probes, but uses a different notation. The logical structure is to first derive the I-V characteristic of a single probe, then to apply that to the special case of two electrodes hooked together to get the I-V characteristic of a double probe, and finally to apply the double probe formula to the special case of a large and constant bias voltage and throw in a floating tip to explain the triple probe. Formulas should not be derived twice. I hope what we see now is only a start. --Art Carlson (talk) 08:28, 19 March 2009 (UTC)[reply]

The picture shows a Langmuir probe for measurements in a very specific environment. The probe is spherical and has a diameter of 50 mm or so. Usually in probe diagnostics, one has to make the probe surface as small as possible, to keep the disturbance of the probe small. At the same time, the probe should still draw enough current to be measured precisely. One should also try to stay either in thick sheath or thin sheath regime, if orbital motion of ions plays into account. For me, who's a lab experimentalist, the shown probe is really huge! Typical probe dimensions for my purposes are 7 mm long 100 microns in diameter (cylindrical probes). However, depending on the discharge conditions, it can look very different, e.g. if you use buffled probes in magnetized environment. Maybe it is possible to add some more pictures! --134.245.68.90 (talk) 12:24, 2 August 2010 (UTC)[reply]

There's no obvious reason for a separate article (which doesn't even mention electron flow). — HHHIPPO 20:28, 16 May 2013 (UTC)[reply]

I did move it in Langmuir probe E. V. Shun'ko (talk) 18:24, 29 July 2013 (UTC)[reply]

There is also the newly developed multipole resonance probe.^{[1] [2] [3]} It is a novel diagnostic approach for measuring plasma electron density, etc.37.201.241.10 (talk) 15:42, 6 November 2014 (UTC)[reply]