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Properties of microwave plasma torch operating at a low pressure
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10.1063/1.2993210
/content/aip/journal/pop/15/10/10.1063/1.2993210
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/10/10.1063/1.2993210

Figures

Image of FIG. 1.
FIG. 1.

Schematic presentation of a microwave plasma torch operating in a chamber at a reduced pressure.

Image of FIG. 2.
FIG. 2.

Plots of the microwave power required for gas breakdown vs gas pressure for three different gases.

Image of FIG. 3.
FIG. 3.

A photograph of a torch flame taken through the view port of the discharge tube shown in Fig. 1. This is a nitrogen gas torch powered at and operating at a pressure of . The nitrogen flow rate is .

Image of FIG. 4.
FIG. 4.

Profile of the simulated optical emission of OH radicals around represented by the solid curve in comparison to the experimental emission data (square dots). The estimated gas temperature here is .

Image of FIG. 5.
FIG. 5.

Measured data of the flame temperature at the bright spot of the plasma torch vs the microwave power at an airflow rate of and at air pressures of and .

Image of FIG. 6.
FIG. 6.

Emission profiles of the hydrogen Balmer beta line of the plasma torch powered at and operated at the pressure of .

Image of FIG. 7.
FIG. 7.

Plots of the measured plasma density vs the microwave power for an argon flow rate of and a hydrogen flow rate of at a chamber pressure of .

Image of FIG. 8.
FIG. 8.

Plots of the reflected microwave power vs flow rate for a nitrogen flow rate of , a gas pressure of , and forward microwave powers of and .

Image of FIG. 9.
FIG. 9.

Plots of vs for the experimental data in Table I. The straight line is the least-squares fit to the experimental data.

Image of FIG. 10.
FIG. 10.

Image of the emission from air molecules exited from the torch at an airflow rate of and a pressure of . The emission image was taken through the view port of the chamber shown in Fig. 1.

Image of FIG. 11.
FIG. 11.

Fourier transform infrared (FTIR) spectra before and after a microwave plasma torch operated at a nitrogen flow rate of , a flow rate of , a chamber pressure of , and microwave powers of and .

Image of FIG. 12.
FIG. 12.

Plots of the measured DRE data vs the flow rate at a nitrogen flow rate of , a gas pressure of , and microwave powers of and .

Tables

Generic image for table
Table I.

The light emission intensity and excitation energy for argon I and II spectrum.

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/content/aip/journal/pop/15/10/10.1063/1.2993210
2008-10-08
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Properties of microwave plasma torch operating at a low pressure
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/10/10.1063/1.2993210
10.1063/1.2993210
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