| abstract |
There is provided by this invention a broad band acoustic transducer comprising a piezoelectric crystal with a two layer dampening backing having very high attenuation properties. Each layer has an impedance matching the acoustical impedance of the crystal, however, the second layer has an attenuating additive that greatly increases its attenuation factor. The surface interface between the two dampening layers is tilted and roughened to induce wave scattering that prevents back reflections. |