Abstract
In order to investigate the characteristics of radiation around Si-based heat-resistant materials in air plasma freejets, radiation measurements were performed at the three positions around ablating silicon carbide test piece in the air plasma freejets, namely just upstream point of the tip of the ablating test piece, side point just off the surface of the test piece, and a point in the ablation gas at a distance from the flow axis. In each point, characteristic continuum radiation, atomic Si lines, OH molecular bands, and CN molecular bands were observed in common.
