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TEMPERATURE EFFECTS ON AIRGUN SIGNATURES 1
Author(s) -
LANGHAMMER JAN,
LANDRØ MARTIN
Publication year - 1993
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.1365-2478.1993.tb00881.x
Subject(s) - bubble , volume (thermodynamics) , bar (unit) , signature (topology) , water mass , materials science , geology , mechanics , physics , thermodynamics , oceanography , geometry , mathematics
A bstract Experiments in an 850 litre water tank were performed in order to study temperature effects on airgun signatures, and to achieve a better understanding of the physical processes that influence an airgun signature. The source was a bolt airgun with a chamber volume of 1.6 cu.in. The pressure used was 100 bar and the gun depth was 0.5 m. The water temperature in the tank was varied between 5°C and 45°C. Near‐field signatures were recorded at different water temperatures. Typical signature characteristics such as the primary‐to‐bubble ratio and the bubble time period increased with increasing water temperature. For comparison and in order to check whether this is valid for larger guns, computer modelling of airguns with chamber volumes of 1.6 and 40 cu.in. was performed. In the modelling the same behaviour of the signatures with increasing water temperature can be observed. The increase in the primary‐to‐bubble ratio and the bubble time period with increasing water temperature can be explained by an increased mass transfer across the bubble wall.