DEVELOPMENT OF NOVEL TRANSDUCER MATERIALS

传统的压电材料，如用于换能器的PZT-5 H 可能不适合于VHF换能器和阵列制造。 此外，具有更高耦合的更好的压电材料 系数和可变介电常数， 带宽和更灵活的换能器设计是需要的 传统线性阵列性能的改进以及 多维数组的发展。 在这个项目中， PZT具有较小的晶粒尺寸和单晶弛豫材料 例如PZN-PT，其具有比PZN-PT高得多的耦合系数， PZT-5 H将被制备和改进用于VHF线阵制造。 此外，通过溶胶-凝胶工艺制备的1-3纤维复合材料将 适用于VHF单元件换能器。 的潜力 这些材料已被证明是更好的性能， 超声波换能器的带宽和灵敏度， 这些材料与在室温下由PZT-5 H制备的材料相比， 类似的条件。

Conventional piezoelectric materials such as PZT-5H for transducer may not be suitable for VHF transducer and array fabrication. Moreover, better piezoelectric materials with higher coupling coefficient and variable dielectric constant allowing for wider bandwidth and more flexible transducer design are needed for the improvement of conventional linear array performance as well as the development of multidimensional arrays. In this project, fine grain PZT which has smaller grain size and single crystal relaxor materials such as PZN-PT which has a much higher coupling coefficient than PZT-5H will be prepared and improved for VHF linear array fabrication. In addition 1-3 fiber composites prepared via a sol-gel process will be developed for VHF single element transducers. The potential of these materials has been demonstrated by the better performance in bandwidth and sensitivity of ultrasonic transducers prepared from these materials in comparison to those prepared from PZT-5H under similar conditions.