制备横向压电系数d31高达-480pC/N和居里温度Tc达280℃的高性能PZT压电陶瓷材料, 再制成厚0.3mm、宽1.0mm和长度分别为3.5、4.0和4.5mm的压电双晶片(PCBE), 结合前置放大器制成声电换能器, 将其植入猫耳内并测试PCBE耦合于听骨链上的声学信号拾取能力. 结果表明: 制备的PCBE具有良好的声?电换能性能; 三种长度的PCBE均可全部植入猫耳鼓室, 拾取体外20~20000Hz声信号可获得较平坦的频响曲线, 长度为4.5mm的PCBE拾取信号最佳, 最大输出达-13.16 dB(0dB输入, 1.5 kHz时). 证实PZT压电双晶片可以制成鼓室内全植入式传声器.
A novel PZT piezoelectric ceramics with high d31 (-480pC/N) and Tc (280℃) was developed to shape a long strip of piezoelectric ceramic bimorph element (PCBE), with 0.3 mm in thickness, 1.0 mm in width and three lengths (3.5, 4.0, 4.5 mm), which were assembled to the cantilever structure anchoring a Preamplifier, and were implanted totally into tympanic cavity of cat ear to analyze their ability of picking up acoustic signal. This study explores that the PCBEs have high efficient acoustic-electric performance. They can pick up 20-20000Hz acoustic signal with an approximate flat frequency curve when they are implanted the tympanic cavity of cat. The maximal output of -13.16 dB Volt p-p value (@1.5kHz, 0dB input) is picked up by the 4.5mm PCBE. This validates that PCBE might be totally implanted into tympanic cavity of cat ear as a piezoelectric microphone.
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