Laser Thomson scattering was applied to an atmospheric-pressure plasma produced in a helium (He) gas flow for measuring the spatial profiles of electron density (ne) and electron temperature (Te). Aside from the He core flow, the shielding gas flow of N2 or synthesized air (N2 : O2 = 4 : 1) surrounding the He flow was introduced to evaluate the effect of ambient gas components on the plasma parameters, eliminating the effect of ambient humidity. The ne at the discharge center was 2.7 ' 1021m%3 for plasma generated with N2/O2 shielding gas, 50% higher than that generated with N2 shielding.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)