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本文介绍一种用于心脏成象的相控阵换能器中 ＰＺＴ基元的电连接技术。该换能 器采用叠层结构，将表面镶有金属的 ＰＺＴ基片通过具有适当声阻抗的氧化铝衬底与 吸声材料相粘接。ＰＺＴ基片被切割成一个基元阵；一层与声透镜外形相同的金属箔 粘在基元的顶部，作为公共接地极。换能器外面罩有一个氧化铝盒，对于ＰＺＴ基元 的电连接是通过氧化铝盒两侧的丝网印刷导线来实现的。将此叠层式换能器组件装 在亚麻电木壳内，然后注入硅橡胶，加以密封。 本文还介绍了我们所采用的吸声材料表面的加工技术，采用这一技术能够增加 换能器的带宽。最后，我们给出了该换能器在探测水中点目标时所获得的脉冲－回波 响应。
This article describes a technique for electrical connection of PZT elements in phased array transducers for cardiac imaging. The transducer uses a laminated structure that bonds a metal-embedded PZT substrate to a sound-absorbing material through an alumina substrate with a suitable acoustic impedance. The PZT substrate is cut into a matrix array; a metal foil of the same configuration as the acoustic lens is glued to the top of the cell as a common ground. The transducer is covered with an alumina box on the outside and electrical connections to the PZT elements are made by screen-printed conductors on both sides of the alumina box. The laminated transducer assembly is packed in a linen balsa wood, then filled with silicone rubber and sealed. This article also describes the processing technology we use on the surface of sound-absorbing materials that can increase the bandwidth of the transducer. Finally, we show the pulse-echo response of the transducer when it detects a water-spot target.