Abstract
Abstract : This technical memorandum presents the results of source level measurements made on two Bolt Associates air guns - with and without various modifications. The objective of the tests was to determine the air-gun configuration that would best meet the requirements developed for an array element. The energy source level required from each array element is 223 dB re(micro Pa-squared) sec in the fundamental frequency band. Earlier test results showed that this source level can be achieved - but only at low fundamental frequencies (shallow depths). The energy source levels were seen to decrease with increasing fundamental frequency obtained at increased source depths. An additional test objective, therefore, was to study the causes of this decrease in source level. Diagnostic measurements were made, using a pressure transducer mounted inside the air gun, and various modifications were introduced to the two basic air guns in an attempt to improve their acoustic performance at large depths.
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