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--- private:writeups:plasmaimpedanceprobes [2020/07/01 21:04]
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+++ private:writeups:plasmaimpedanceprobes [2020/07/02 14:17] (current)
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 PIPs can be operated in a number of methods
-  - Actively driven RF sweeps [Blackwell2005].  Relate the peaks and zero intercepts of Re(Z) and Im(Z) to circuit models to get the plasma frequency.
+  - Actively driven RF sweeps [Blackwell2005].  Relate the peaks and zero intercepts of Re(Z) and Im(Z) to circuit models and dispersion relationships to get the plasma frequency.
-  - Plasma oscillation (excite a two stream instability) [Blackwell2005].  Drive weak beam of electrons into the plasma to excite a two stream instability.  It's frequency is close to the plasma frequency.  An FFT of passive PIP measurements reveals the frequency.
+  - Plasma oscillation (excite a two stream instability) [Blackwell2005].  Drive weak beam of electrons into the plasma to excite a two stream instability.  Under correct conditions, its frequency is close to the plasma frequency.  An FFT of passive PIP measurements reveals the frequency.
-=== Advantages/disadvantages ===
+=== Advantages ===
   * [Blackwell2005] An improvement over Langmuir probes because contamination of the probe has a larger impact on its measurements than on the PIP.
+  * Better resolution and accuracy than traditional Langmuir probes [citation]
+=== Disadvantages ===
+  * More complicated.  Requires careful setup/calibration and the use of an expensive network analyzer.
+  * (Check this) Cannot be used in real-time because the network analyzer data can only be post-processed.
 === Sources of error ===

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