Abstract
Optical attenuation characteristics in the shock layer for carbonaceous material and Teflon heated in arc jet wind tunnel flows are examined. A He-Ne laser beam is passed ahead of a blunt body in a direction perpendicular to an arc jet flow and the temporal history of the intensity of the laser is measured. The results show that no optical attenuation is observed in arc jet freestream and in a shock layer for the case of Teflon. For the carbonaceous material, intermittent optical attenuation is observed when the laser beam is passed in and probably ahead of the shock layer. This behavior is believed to due to the particulate interference of the laser beam. The particles are likely ejected from the carbonaceous material due to spallation.
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