Using optical emission spectroscopy (OES) measurement and global optimal
search methods, the electron energy distribution function (EEDF), electron temperature T_e, and density N_e of dielectric barrier discharge (DBD) atmospheric-pressure non-equilibrium
plasma (APNEP) are measured. Continuum emission due to bremsstrahlung is observed to the analysis with the spectrometric system in the visible wavelength range calibrated absolutely. Experimental results are compared with the theoretical spectra determined by
linear combination of generalized EEDF in entire measurable range. The methodology to find the best theoretical fitting to obtain the plasma parameters is discussed with global optimization mathematics. It is found that T_e ~ 1.9 – 1.5 [eV] and 0.33 – 0.52 [eV], and the
general EEDF parameter γ ~ 11 – 5 and 1 – 2.75 in high- and low- energy regions, respectively, as discharge voltage increases. N_e is confirmed to be approximately (0.63 - 5.3) ×
10^{13}[cm^{-3}].
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