Piezoelectric Ceramic Hydrostatic Sound Sensor.
Abstract
This invention relates to a piezoelectric ceramic hydrostatic sound sensor or transducer having one or a plurality of voids and to a method for making such a transducer. Conventional piezoelectric ceramic hydrophones employ relatively incompressible materials such as lead zirconate titanate (PZT) having the general formula (PbO) (ZrO2) 0.52 (TiO2) 0.48; PZT doped with 6-15% lanthanum oxide, La2O3 (PZLT); barium titanate, BaTiO3; lead zinc niobiate, (PbO) (ZnO) (Nb2O5); and lead magnesium niobiate, (PbO) (MgO)0.33(Nb2O5)0.67. The electromechanical response of ceramic transducers to hydrostatic pressure variations is only a fraction of their uniaxial electromechanical sensitivity because, due to their Poisson ratio, the lateral force components due to hydrostatic pressure tend to cancel out the axial compression of the material, thereby reducing the electromechanical response to hydrostatic pressure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 05, 1990
- Accession Number
- ADD015030
Entities
People
- Manfred Kahn
- Mark Chase
Organizations
- United States Department of the Navy