TY - JOUR
T1 - Laser scattering on an atmospheric pressure plasma jet
T2 - Disentangling Rayleigh, Raman and Thomson scattering
AU - Van Gessel, A. F H
AU - Carbone, E. A D
AU - Bruggeman, P. J.
AU - Van Der Mullen, J. J A M
PY - 2012/2
Y1 - 2012/2
N2 - Laser scattering provides a very direct method for measuring the local densities and temperatures inside a plasma. We present new experimental results of laser scattering on an argon atmospheric pressure microwave plasma jet operating in an air environment. The plasma is very small so a high spatial resolution is required to study the effect of the penetration of air molecules into the plasma. The scattering signal has three overlapping contributions: Rayleigh scattering from heavy particles, Thomson scattering from free electrons and Raman scattering from molecules. The Rayleigh scattering signal is filtered out optically with a triple grating spectrometer. The disentanglement of the Thomson and Raman signals is done with a newly designed fitting method. With a single measurement we determine profiles of the electron temperature, electron density, gas temperature, partial air pressure and the N 2/O 2 ratio, with a spatial resolution of 50νm, and including absolute calibration.
AB - Laser scattering provides a very direct method for measuring the local densities and temperatures inside a plasma. We present new experimental results of laser scattering on an argon atmospheric pressure microwave plasma jet operating in an air environment. The plasma is very small so a high spatial resolution is required to study the effect of the penetration of air molecules into the plasma. The scattering signal has three overlapping contributions: Rayleigh scattering from heavy particles, Thomson scattering from free electrons and Raman scattering from molecules. The Rayleigh scattering signal is filtered out optically with a triple grating spectrometer. The disentanglement of the Thomson and Raman signals is done with a newly designed fitting method. With a single measurement we determine profiles of the electron temperature, electron density, gas temperature, partial air pressure and the N 2/O 2 ratio, with a spatial resolution of 50νm, and including absolute calibration.
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U2 - 10.1088/0963-0252/21/1/015003
DO - 10.1088/0963-0252/21/1/015003
M3 - Article
AN - SCOPUS:84856884713
SN - 0963-0252
VL - 21
JO - Plasma Sources Science and Technology
JF - Plasma Sources Science and Technology
IS - 1
M1 - 015003
ER -