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THE RADIATION OF ACOUSTIC WAVES FROM AN AIR‐GUN *
Author(s) -
SAFAR M. H.
Publication year - 1976
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1976.tb01571.x
Subject(s) - amplitude , pulse (music) , bubble , optics , acoustics , mechanics , physics , volume (thermodynamics) , air bubble , detector , quantum mechanics
A bstract A theoretical model is developed for predicting three important parameters of the pressure pulse radiated by an air‐gun, namely the rise time, the amplitude of the initial pulse, and the period of the bubble pulse. A knowledge of these three parameters is essential for the efficient design of air‐guns arrays. The prediction of the amplitude of the initial pulse is based on the assumption that the initial pulse is radiated by a spherical source with surface area equal to that of the air‐gun ports and not by a spherical source with initial volume equal to that of the air‐gun chamber, as has been assumed previously. A simple equation is obtained for predicting the period of the bubble pulsation, taking into account the effect of the air‐gun body, boundaries such as the sea‐surface and seabed and the presence of a number of identical air‐guns placed at the same depth and fired simultaneously.