Abstract
A very low-frequency (1–10 Hz) sound source is needed for greater penetration in the earth below a water layer. A neutral buoyant acoustic dipole is proposed for this purpose. With the dipole positioned vertically near the pressure release surface, the upward wave produced is inverted and adds to the downward wave. A model of such a dipole to operate in the range 20–40 Hz was built. It was driven by an inertial force generator. It was tested in an 11-m deep tank under low signal/noise conditions. Only near field pressure and water loading could be measured. In order to get design parameters for a 1–10 Hz dipole, scaled experiments using dipoles operating in the 3–5 kHz region with adjustable source spacing and depth were built and tested. A trade-off between source spacing for greater sound pressure and depth for summing the two waves were studied. In the deep tank, near- and far-field pressures were measured. [This study was supported by EXXONMOBIL.]
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