| 张剑,吕加兵,朱鑫乐,崔崤峣,李章剑.超声换能器环氧树脂-氧化铝匹配层研究[J].声学技术,2022,41(4):630~636 |
| 超声换能器环氧树脂-氧化铝匹配层研究 |
| Study of the epoxy-alumina composite based matching layer for ultrasonic transducer |
| 投稿时间：2021-04-13 修订日期：2021-05-12 |
| DOI：10.16300/j.cnki.1000-3630.2022.04.023 |
| 中文关键词: 高频超声换能器 匹配层 氧化铝 环氧树脂 带宽 |
| 英文关键词: high frequency ultrasonic transducer matching layer alumina epoxy resin bandwidth |
| 基金项目:吉林省科技发展计划项目《微型高频介入超声导航系统研制及其在穿刺诊疗应用研究》(20200404161YY)。 |
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| 中文摘要: |
| 匹配层对超声换能器的性能起着至关重要的作用，寻找合适的匹配层材料是换能器设计中的关键步骤。提出了一种基于环氧树脂-氧化铝复合材料的匹配层材料。首先，测试了不同配比的环氧树脂-氧化铝复合材料的声学性能，对比了其声学特性，并确定了材料的最佳配比。其次，研制了相应的换能器，分析该匹配层对换能器性能的影响，通过脉冲-回波方法测试了其性能参数。最后，基于四分之一波长匹配层原理对匹配层的厚度进行了优化。结果显示，环氧树脂中加入质量分数为 60%的氧化铝粉末的匹配层对换能器的改善效果最佳，该方案减小了换能器接收回波的拖尾，接收回波的幅值提高至 1 136 mV(+104%)，-6 dB带宽达到 49.679%(+107%)。结果表明，氧化铝-环氧树脂混合材料可以提升换能器的声学性能，是较为理想的匹配层材料，在高频超声换能器的设计与应用中具有很好的应用前景。 |
| 英文摘要: |
| Matching layer is indispensable in an ultrasonic transducer. Finding suitable matching layer material is crucial in the procedure of transducer design. In this study, a matching layer material based on epoxy-alumina composite is proposed. The acoustic properties of epoxy-alumina composites with different proportions are firstly tested and compared, and the optimal proportion is determined. Then, transducers with epoxy-alumina composite based matching layer are developed, their performance parameters are measured by pulse-echo method. Finally, the thickness of the matching layer is optimized based on the quarter-wavelength theory. The results demonstrate that the matching layer with the mass fraction of 60% of alumina powder provides the best improvement in the transducer performance; the tail of the received echo pulse is reduced, the amplitude is increased to 1 136 mV (+104%), and the -6 dB bandwidth can reach 49.679% (+107%). All the results indicate that this epoxy-alumina composite material can improve the performance of transducer, and has a great application potential in the design of high frequency ultrasonic transducer. |
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