• 作者： 陳文咸
• 作者服務機構： 中正理工學院物理系
• 中文摘要： 利用阻抗匹配模式，我們推導了一個一般化的理論，用來預測含介電損耗與機械損耗壓電?能器的性能。實驗上測量了PVF2壓電薄膜的介電損耗與介電常數的頻率響應，配合理論式，我們預測了PVF2換能器的電輸入阻抗，及在高電場 操作下聲波輻射功率、耗損功率、?度上升率及效率。結果並與PZT?能器性能作比較。
• 英文摘要： Electrical, acoustical, and thermal performance of polyvinylidene fluoride (PVF2) transducer has been theoretically and experimentally studied. A general theory, based on the impedance matrix model, for predicting the performance of an acoustic transducer made from a piezoelectric material with non-negligible dielectric loss and mechanical loss has been formulated and expressed in terms of an equivalent electrical series circuit. Computer programs were designed to predict the electrical input impedance as a function of frequency of loaded PVF2 transducers, and to model the radiated acoustic power as a function of input electric field, and the temperature rise of the PVF2 film under high electric field, as high as 30 v/μM, operation. The dielectric loss, and dielectric permittivity in oriented PVF2 film were measured from 0.5 MHz to 100 MHz. The measured loss tangent and permittivity as functions of frequency were used to model the dielectric and acoustic losses in the theoretical calculation. Temperature rise as a function of applied field and frequency, and the efficiency of the transducer are predicted and compared with that of PZT transducer.
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