Schematic presentation of a microwave plasma torch operating in a chamber at a reduced pressure.
Plots of the microwave power required for gas breakdown vs gas pressure for three different gases.
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 .
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 .
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 .
Emission profiles of the hydrogen Balmer beta line of the plasma torch powered at and operated at the pressure of .
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 .
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 .
Plots of vs for the experimental data in Table I. The straight line is the least-squares fit to the experimental data.
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.
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 .
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 .
The light emission intensity and excitation energy for argon I and II spectrum.
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