Abstract

Time-resolved spectra for some hypervelocity spheres and cones in a free-flight ballistic range are obtained using a large aperture, slitless spectrograph in conjunction with an image converter camera. For nonablating spheres, only emission from the shock cap can be observed with the present instrument. For ablating models at elevated speeds and range pressures, band systems for such molecular species as C2, CH, and CN for some objects containing hydrocarbons and Cu2, CuF, CuO, BeO, and AlO for metallic models have been observed in the near wake region of the flow. The feasibility of using a high gain image intensifier for the study of far wake emission is discussed.

© 1967 Optical Society of America

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