A COMPOSITE SONAR TRANSDUCER FOR OPERATION AS A LOW FREQUENCY UNDERWATER ACOUSTIC SOURCE

摘要

A low frequency sonar transducer comprising a head (1) having first and second stacks of piezo ceramic elements (2, 3) in two spaced apart planes between common nodal end supports (7, 8), the stacks being oppositely polarised to act in push-pull action with one stack expanding and the other contracting to cause the head (1) to bow. The transducer is pre-stressed with fibres (6) to prevent fracture.