Fabrication of High Acoustic-Electric Efficient Piezoelectric Ceramic Bimorph Element and Pickup in Middle Ear of Cat

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 im- planted totally into tympanic cavity of cat ear to analyze their ability of picking up acoustic signal. This study ex- plores 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.