Technical Photography and Explosion Phenomenology Measurements from Operation Prairie Flat.
DENVER RESEARCH INST CO
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Technical information pertaining to the detonation phenomena from a 500-ton test was obtained through the use of photographic, spectrographic, and photoelectric devices. Photographic data were recorded with a variety of cameras encompassing a time period from first light to 6 minutes. During this period of time, early-, intermediate-, and late-time fireball and explosion phenomena were recorded with cine cameras operating at from 128 to 25,000 frames per second. In addition, cloud formation and rise were recorded with still cameras at 5-second increments to 6 minutes after detonation. Photoelectric data were obtained from detonation to about 4.5 milliseconds after first light. Time-integrated and time-resolved spectral data were recorded in the spectral region from 2,240 to 10,000 angstroms. The photographic records from the events included information on fireball free-air and surface-surge growth, fireball surface-surge anomalies, reflected shockwave and triple-point paths, and cloud formation and rise. Author