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背衬参数对厚度模压电换能器特性的影响
引用本文:付琳,高永康,高晶敏.背衬参数对厚度模压电换能器特性的影响[J].声学学报,2019,44(2):251-257.
作者姓名:付琳  高永康  高晶敏
作者单位:1. 北京信息科技大学 电子信息与控制国家级实验教学中心 北京 100192;
基金项目:中国石油科技创新基金项目(2016D-5007-0304)促进高校内涵发展-科研水平提高项目(5211824601)资助
摘    要:系统研究了厚度模压电换能器的背衬厚度、声阻抗率及机械损耗因子对换能器振动性能影响,重点分析了在所关心频率附近的有效机电耦合系数和机械品质因数。计算结果表明,随着背衬厚度增大,换能器的有效机电耦合系数和机械品质因数均震荡减小;背衬声阻抗率与压电片声阻抗率差值增大,换能器有效机电耦合系数减小,机械品质因数增大;保持压电片厚度不变,增大背衬的机械损耗因子,换能器有效机电耦合系数单调减小,机械品质因数有极小值,在给定频率范围内电特性曲线趋于光滑。用有限元方法验证了等效电路计算方法的正确性,并对比了换能器的测试结果和计算结果。计算所得规律为厚度模压电换能器的设计和实验制作提供了理论依据。 

关 键 词:换能器背衬    厚度模压电换能器    有效机电耦合系数    机械品质因数
收稿时间:2017-04-13

Influence of the backing parameters on the performance of thickness mode piezoelectric transducer
Institution:1. Beijing Information Science&Technology University National Demonstration Center for Experimental Electronic Information&Control Education, Beijing 100192;2. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190
Abstract:The impacts of the thickness, the specific acoustic impedance and the mechanical loss factor of the backing on the performance of the thickness mode piezoelectric transducer is systemically studied, which is focused on the effective electromechanical coupling coefficient and the mechanical quality factor near the center frequency. The results show that with continuous increasing of the backing thickness, the effective electromechanical coupling coefficient and the mechanical quality factor is found rapidly declined by oscillation way. With the increase of the difference value of the acoustic impedance between the backing material and the piezoelectric material, the effective electromechanical coupling coefficient deceases and the mechanical quality factor increases. Under condition that the thickness of the backing is fixed, the effective electromechanical coupling coefficient is found declined with the increase of the mechanical loss factor by monotonous way the mechanical quality factor has minimum value and the electric characteristic curve tends to be smooth in a given frequency range. The equivalent circuit theory result is compared with the finite element method and the test results, which are in good agreement. The work mentioned above provides a theoretical guidance for the design and experimental fabrication of the sidewall ultrasonic imaging well logging transducer. 
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