Abstract
Abstract : The results of this study show that the pneumatic acoustic repeater (PAR) and the pneumatic source WOX-1 will operate consistently at water depths of 500 feet or less and generate a repetitive sound wave of amplitude of 110 db within the frequency band of 5 to 50 cps. The PAR is satisfactory for use in tracking submerged submarines in arrays which require a high intensity low frequency source. The results indicate that the source level and frequency content of a pneumatic source can be varied over a wide range by varying the air volume and pressure. Pneumatic sound sources are less efficient than conventional magnetostrictive and piezo-electric transducers are for generating underwater sound waves. The acoustic efficiency of pneumatic sound sources decrease as depth is increased if the chamber pressure and volume remain constant and increase with increasing chamber pressure if the depth and volume remain constant. It is concluded that pneumatic sources are simpler and superior to conventional transducers when used aboard a submarine to generate repetitive low frequency sound waves of high intensity.
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