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AssigneeApplied Physical Sciences Corp.
InventorsJames A. McConnell, Evan F. Berkman, Bruce S. Murray, Bruce M. Abraham
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A coherent sound source is provided for marine seismic surveys. An underwater sound projector for producing time-harmonic waveforms comprises two pistons positioned on either side of an electro-magnetic force generator substantially having mechanical and magnetic symmetry about its geometric center thereby creating a virtual node to substantially cancel reaction loads that occur when the pistons are actuated. The underwater sound projector optionally also includes control systems to improve the fidelity of the force generator, provide pressure compensation to the pistons, finely adjust the static position of the pistons, and change the depth and roll when it is configured as tow body. A plurality of underwater sound projectors can be configured in an array. A load-bearing umbilical can connect the underwater sound projectors to a ship, transmit electrical power to each array element and serve as a duplex data transmission medium to route commands from the ship to the projector and report machinery status to the ship.
An underwater sound projector for producing time-harmonic waveforms, comprising two pistons positioned on either side of an electro-magnetic force generator substantially having mechanical and magnetic symmetry about its geometric center thereby creating a virtual node to substantially cancel reaction loads that occur when the two pistons are actuated, wherein said electro-magnetic force generator comprises at least two stationary coils physically connected to a stator, at least four permanent stationary magnets and at least two moving armatures that drive said two pistons.
An array of underwater sound projectors for producing time-harmonic waveforms, comprising:
Dependencies are inferred from the claim text.