Ultraviolet/Visible Spectral Radiance for the Bow Shock of a Projectile Launched at High Velocities in the AEDC Track G Facility.

摘要

An optical arrangement and detector gating scheme for viewing the bow shock spectral radiation from projectiles launched in a hypervelocity ballistic range are reported. Velocities were about 18,000 fps. Range pressure was 49 torr of dried air. A 0.32-m grating spectrometer with a linear array optical detector was used. Gating times of 275 and 100 microsec were employed to view nose cap radiation during the projectile's flight. The spectrum was dominated by a strong continuum in the visible with molecular band structure superimposed on it. The most dominant radiators in the UV were identified as the NO y bands and OH.N2 + First Negative, N2 Second Positive, CN, and NH were identified as emitters in the near-UV and VIS. In addition, there were many unidentified radiators in the VIS.