Two-dimensional spatial distribution of electric-discharge plasma around a frictional interface between dielectric surfaces

Miura, Takashi; Nakayama, Keiji
May 2001
Applied Physics Letters;5/7/2001, Vol. 78 Issue 19, p2979
Academic Journal
Electric-discharge plasma and thermal radiation were directly observed in measuring two-dimensional spatial distributions of photon emission during friction between a diamond spherical surface and crystalline Al[sub 2]O[sub 3] surface in ambient air. By using spectral filters, a clear difference was observed between the spatial distribution of the radiation from the plasma about the frictional point and that of the thermal radiation. This report elucidates the spatial distribution of the electric-discharge plasma on the interface between dielectric surfaces during friction, which then allows one to estimate the potential difference between the two dielectric surfaces at the discharge sites. © 2001 American Institute of Physics.


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