【摘要】 随着肌骨疾病诊治对成像需求的日益增长，对更高的中心频率和带宽，高灵敏度以及指向性好的高性能肌骨超声换能器的需求也越发迫切。传统的锆钛酸铅陶瓷带宽较窄，振动模态复杂，电声转换效率低，难以满足高性能超声换能器的应用需求。通过有限元仿真方法，设计了一款基于1-3型压电复合材料的肌骨超声阵列式换能器，研究了阵元面积对阵元阻抗的影响以及阵元孔径对换能器声压分布的影响。最后制备了一款基于1-3型压电复合材料的换能器阵元实物并进行测试。测试表明，与同规格PZT-5H换能器阵元相比，其-6 dB带宽提高了18%，中心频率提高了约0.8 MHz。更多还原

【Abstract】 With the increasing demand for imaging in the diagnosis and treatment of musculoskeletal disorders, developing high-performance musculoskeletal ultrasound transducers, featuring higher central frequencies, wider bandwidths, higher sensitivity, and better directivity, is crucial. Traditional lead zirconate titanate(PZT) ceramics, exhibiting narrow bandwidths, complex vibration modes, and low electroacoustic conversion efficiencies, are not suitable for high-performance ultrasound transducer applications. In this study, the finite-element simulation method is used to design a musculoskeletal ultrasound array transducer based on 1-3 piezoelectric composites. The influence of the element’s area on its impedance and that of its aperture on the acoustic pressure distribution of the transducer are investigated. Finally, a physical transducer element based on the 1-3 piezoelectric composite is fabricated and tested.Test results demonstrate that the-6 dB bandwidth and central frequency of the element designed in this study are 18% and approximately 0. 8 MHz higher than those for a PZT-5H transducer element having the same specifications, respectively.更多还原