Frequency analysis of underwater explosions in gas-water resonator
Keimig, Allen D., Jr.
Hofmockel, John L.
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This thesis presents the results of an experimental investigation of the frequency spectrum of the acoustic output from underwater explosions in a gas-water resonator. Measured amounts of hydrogen, oxygen, and nitrogen were used as an explosive charge in cylindrical containers and fired at depths between 25 and 200 feet. Excess unburned gas remaining in the container caused the sound to be concentrated in certain low frequencies; these frequencies correspond closely to predictions based on Helmholtz Resonator calculations. The spectrum was influenced by surface reflection and by frequency shifts observed during the explosive pulse . A narrow band low frequency spectrum analysis system is described.
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