Prestressed annular acoustic transducer

摘要

PCT No. PCT/FR95/01676 Sec. 371 Date Jun. 23, 1997 Sec. 102(e) Date Jun. 23, 1997 PCT Filed Dec. 15, 1995 PCT Pub. No. WO96/20046 PCT Pub. Date Jul. 4, 1996The invention relates to annular acoustic transducers formed by a set of piezoelectric segments placed under prestress. It consists in grouping these segments (101) into a set of sectors (102) which are separated by tightening wedges (109). The set is placed in a shaper annulus (108). The keys are drawn towards the center by screws (111), thus thrusting the sectors against the shaper annulus and prestressing the segments. The strain gauges (107) make it possible to check the stress obtained in order to adjust it to the desired value while minimizing the scatter between the sectors. It makes it possible to manufacture dismantleable low-frequency high-power acoustic transducers.