Abstract
By following the same line of reasoning which the authors used in a previous paper, concerned with cylindrical probes, the ion current Ii to a spherical probe (radius rp, bias voltage V) immersed in a collision-dominated flowing plasma of subsonic velocity vf has been calculated to beIMG1where ne is the electron density, μi the ion mobility, e the electronic charge and ϵ0 the permittivity of free space. This theory is only valid for conditions where the plasma sheath diameter r0>>rp.A propane-air flame with a moving probe was used to investigate the above relationship. Reasonable agreement (considering the approximations made in deriving the theoretical relationship) was obtained between measured and theoretical ion currents.
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