Aerial motion pictures from manned aircraft were taken of the Dog, Easy and George Shots and from a drone aircraft on Dog Shot to determine whether asymmetries in the blast waves could be detected and measured. Only one film, that taken of Dog Shot from a drone, was considered good enough to warrant detailed analysis, but this failed to yield any positive information on asymmetries. The analysis showed that failure to obtain good arrival-time data arose from a number of cases, but primarily from uncertainities in magnification and timing. Results could only be matched with reliable data from blast-velocity switches by use of large corrections. Asymnetries, if present, were judged to have been too small or to have occurred too early to be detected with the slow frame speed used. Recommendations for better results include locating the aircraft directly overhead at the time of burst and using a camera having greater frame speed and provided with timing marks.
Operation Greenhouse. Scientific Director's Report of Atomic Weapon Tests at Eniwetok, 1951. Annex 1.6, Blast Measurements. Part 3. Pressure Near Ground Level. Section 4. Blast Asymmetry from Aerial Photographs. Section 5. Ball-Crusher-Gauge Measurements of Peak Pressure
1985
65 pages
Report
No indication
English
Nuclear Explosions & Devices , Photographic Techniques & Equipment , Nuclear explosion testing , Blast waves , Pressure measurement , Asymmetry , Aerial photographs , Photographic Analysis , Peak values , Velocity , Drones , Crusher gages , Ground level , Enewetok atoll , NTPR(Nuclear Test Personnel Review) , Greenhouse Operation , Dog Shot , Easy Shot , George Shot , U/A Reports