Downhole acoustic transducer

An acoustic transducer, comprising:

• a deformable tube closed at one end,
• a first pair and a second pair of diametrically opposing elongate segments in angularly alternating arrangement disposed on the inside wall of said tube;
• said tube and said pairs of segments defining an inside space comprising at least one first and at least one second longitudinal sections in a non-overlapping, longitudinally alternating arrangement;
• at least one first and one second stack of piezoelectric pellets uninterruptedly extending within said space between the two segments of, respectively, said first pair and said second pair in the respective diametric direction thereof and operable to expand along said diameter for action upon the respective pair of segments;
• said at least one first stack being located in said at least one first longitudinal section while said at least one second stack is located in said at least one second longitudinal section.

An acoustic transducer, comprising:

• a deformable tube closed at one end,
• at least a first pair and a second pair of diametrically opposite elongate segments in angularly alternating arrangement disposed on the inside wall of said tube;
• said tube and said pairs of segments defining an inside space comprising at least one first and at least one second longitudinal sections in a non-overlapping, longitudinally alternating arrangement;
• drive means extending within said longitudinally alternating spaces between the two segments of, respectively, said first pair and said second pair in the respective diametric direction thereof and operable to expand along said diameter for action upon the respective pair of segments;
• the drive means located in said at least one first longitudinal section being disposed in one diametric direction, and the drive means located in said at least one second longitudinal section being disposed in the other diametric direction.