Acoustic source apparatus, systems, and methods

A system, comprising:

• a tubular housing;
• and
• an apparatus comprising a motor having a shaft disposed within the tubular housing, a rotatable driving member having at least one driving lobe, the driving member coupled to the shaft, and a unitary driven member having at least one cam, the driving member disposed completely within the driven member, wherein the driven member is configured to be set in motion to launch an acoustic wave along an axis substantially orthogonal to an axis of rotation of the driving member when the driving member rotates to periodically contact the at least one cam with the at least one driving lobe, the acoustic wave having a signature determined by a profile of the cam and a rotation rate of the driving member.

A method, comprising:

• rotating a rotatable driving member having at least one driving lobe;
• and
• during rotation of the rotatable driving member, periodically contacting at least one cam on a unitary driven member with the at least one driving lobe to set the driven member in motion to launch an acoustic wave along an axis substantially orthogonal to an axis of rotation of the driving member, the driving member disposed completely within the driven member, and the acoustic wave having a signature at least partially determined by a profile of the cam and a rotation rate of the driving member.