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US 5,212,353 AGranted
Transducer system for use with borehole televiewer logging tool
AssigneeShell Oil Company
InventorsFrederick H. K. Rambow, Rocco DiFoggio
Life of this patent
Estimating the term…
Abstract
A focused acoustic transducer for use with a borehole televiewer wherein the transducer is provided with a concaved surface designed to focus the acoustic energy and reduce the energy present in the side lobes of the near field.
Claims2
An improved transducer system for a borehole televiewer operating in heavy mud comprising:
- a spherical transducer operating at a frequency of 250-350 kHz, having a radius of between 2.5 and 4.5 inches and having a A/.lambda. ratio of at least two, said transducer being mounted in a sound absorbing mount and disposed for rotation about the axis of the televiewer;
- and
- a cylindrical acoustic window formed of polymethylpentene, said window being disposed to surround said transducer, the wall of said window being inclined at an angle of 3 to 5 degrees with respect to the axis of the cylinder.
Dependencies are inferred from the claim text.