基于高频聚焦P ((VDF-TrFE) 传感器的高声阻抗和衰减支持
Sean Toffessi Siewe1,2,3, Samuel Callé1, François Vander Meulen1
1GREMAN, UMR 7347, University of Tours, CNRS, INSA Centre Val de la Loire, 37200 Tours, France.
Sensors (Basel, Switzerland)
|July 11, 2023
概括
新的复合材料支持增强了用于医学成像的微型超声波传感器. 与锡或环氧合的烧结青铜提供了高声阻抗和衰减,改善了小动物,皮肤和眼睛成像等应用的灵敏度和带宽.
科学领域:
- 材料科学 材料科学 材料科学
- 声学 声学 在声学方面
- 生物医学工程 生物医学工程
背景情况:
- 压电P ((VDF-TrFE) 薄膜用于高频超声波传感器,但由于低合系数,其灵敏度有限.
- 微型高频传感器需要具有高声阻抗 (>25 MRayl) 和强弱衰减的支持材料,以实现最佳的灵敏度-带宽权衡.
- 像小动物,皮肤和眼睛成像等医疗应用需要先进的传感器设计.
研究的目的:
- 开发和描述小型化高频超声波传感器的新型多相复合材料支持材料.
- 评估用锡或环氧树脂浸的烧结青铜复合材料的声学性能 (阻抗和减弱).
- 评估纳入这些新型支持材料的传感器的性能,用于医学成像应用.
主要方法:
- 具有特定粒度的多孔烧结青铜被或环氧树脂浸,以创建多相复合材料支.
- 进行了微观结构性表征,以分析复合材料组成,包括存在空气相.
- 对烧结青铜-锡-空气和烧结青铜-环氧气复合材料的声学性能 (阻抗和衰减) 进行了测量.
- 基于聚焦单元P ((VDF-TrFE) 的传感器使用开发的支持材料制造,并以中心频率和带宽为特征.
- 图像成像性能使用脉冲回声系统在钢线幻影上进行评估.
主要成果:
- 开发的多相复合材料,烧结青铜-锡-空气和烧结青铜-环氧气,呈现出高声阻抗,分别为32.4 MRayl和26.4 MRayl.
- 减弱系数测量为1.2dB/mm/MHz的烧结青铜-锡空气和>4dB/mm/MHz的烧结青铜-环氧气.
- 使用这些背板制造的传感器显示中心频率为27MHz,-6dB带宽为65%.
- 在25微米线幻影上进行的成像测试证实了这些支对于微型传感器应用的可行性.
结论:
- 基于新型烧结青铜的复合材料背板为小型化的高频超声波传感器提供了合适的声学性能.
- 这些材料有效地解决了医疗成像应用的灵敏度-带宽权衡要求.
- 将这些多相支集成到P ((VDF-TrFE) 传感器中显示出对先进的诊断成像的前景.
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