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Temporary-resolved measurement of electron density in small atmospheric plasmas
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Image of FIG. 1.
FIG. 1.

(a) The schematics of RMS experimental setup. (b) Typical scattering signals measured by RMS setup induced by calibrator bullet flying over the microwave horns along -axis [in-phase and quadrature components, and total amplitude of output signal ]. Teflon bullet of 8.5 mm length and 3.2 mm diameter was used. (c) Typical image of plasma jet for , He flow of 15 1/min.

Image of FIG. 2.
FIG. 2.

RMS system calibration with Teflon bullets shot along -axis [see Fig. 1(a)]. (a) Dependence of output microwave signal on calibrator bullet length. (b) Angular distribution of scattered radiation in plane (for bullet length ). All signals are referred to the moments of time when bullets centers crossed plane .

Image of FIG. 3.
FIG. 3.

Typical scattered pattern from the atmospheric plasma jet. Inset diagram presents angular distribution of amplitudes of scattered peaks 1 and 2 (high voltage amplitude ).

Image of FIG. 4.
FIG. 4.

Temporal evolution of average plasma density in atmospheric plasma jet for and 3.8 kV.


Generic image for table
Table I.

Coefficient of proportionality of RMS system relating amplitude of output signal with calibrator bullet dielectric permittivity and volume (referred to calibrator bullets located at point of origin and oriented along -axis).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Temporary-resolved measurement of electron density in small atmospheric plasmas