Feasibility studies on generation-, measurement- and application-techniques of ultra-high temperature fields by arc-discharge, 3

Recent developments in laser techniques for the diagnostics of partially ionized plasmas such as arc-discharge are reviewed. Since laser measurements may provide excellent temporal and spatial resolution and its possibility of non-intrusive nature, compared to other conventional techniques, it may be said that laser measurements are a new diagnostic tools for plasma. This report presents both methods and applications of interferometry, laser scattering, spectroscopy and laser velocimetry to the determinations of electron temperature, electron densities, species concentrations and flow velocity. The basic principles of these methods are described and their advantages and practical limitations are discussed. (author)