BLAST-WAVE MASS-MOTION MEASUREMENTS
LOS ALAMOS NATIONAL LAB NM
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Operation Ivy was instrumented for the mass-motion method of pressure measurement in a manner similar to that used on Operations BusterJangle and Tumbler-Snapper. Low-altitude pyrotechnic mortar bursts and high-altitude gun bursts on Mike only labeled the air for photographic recording. The methods of instrumentation are described the method of data analysis is outlined and derived data on time of arrival, peak material velocity, peak shock velocity, and peak overpressure are presented in tabular and graphic form. Appendixes present meteorological and ballistic data and calculations. An outstanding conclusion of the experiment is the lowness of peak overpressures near the surface compared with the peak overpressures at altitudes up to 25,000 ft because of the effect of atmospheric inhomogeneity at long ranges. The mass- motion technique offers a useful diagnostic tool for the determination of total hydrodynamic yield.
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