Abstract
New experimental measurements of underwater source levels for explosive charges at depths ranging from 20 to 200 m are reported. The explosives used include 45 g (1.6 oz) TETRYL primer charges, 454 g (1.0 lb) bare TNT charges, 31 g (1.1 oz) TETRYL SUS charges and 816 g (1.8 lb) TNT SUS charges. Underwater pressure measurements were made at a nominal distance of 1500 m. For frequencies below approximately twice the bubble frequency, the experimentally measured acoustic energy spectra show a remarkable correspondence when they are appropriately scaled for detonation depth and for charge weight. A universal model of the low frequency energy spectra of TNT and similar explosives, which can be scaled to different charge weights and different detonation depths, shows considerable promise.
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