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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >A polyimide??etalon thin film structure for all-optical high-frequency ultrasound transduction
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A polyimide??etalon thin film structure for all-optical high-frequency ultrasound transduction

机译：用于全光学高频超声转导的聚酰亚胺-标准具薄膜结构

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摘要

In this work, we have designed, fabricated, and tested an all-optical ultrasound transducer by integrating a photoabsorptive polyimide thin film into a Fabry??P??rot (etalon) high-frequency receiver. A 5-ns UV pulse was used for thermoelastic ultrasound generation in the polyimide film, and the transmission had a maximum amplitude of 4.3 MPa centered at 27 MHz with a fractional bandwidth of 107%. The device attained a noise-equivalent pressure of 1.3 Pa/ Hz in receive-only mode. When used in pulse??echo mode, the ??6-dB upper cutoff frequency of the transmit/receive response reached 47 MHz. Basic imaging capabilities were also investigated by scanning the near-infrared probe beam across the device to create a 2 ?? 2 mm synthetic aperture. The imaging of targets placed at depths of 1.8 and 5.2 mm yielded estimates of 71 and 145 ??m, respectively, for the lateral resolution and 35 and 38 ??m, respectively, for the axial resolution. Finally, a design concept for a forward-viewing intravascular imager is presented that entails the coupling of light to a rotating, linear array of optical fibers on top of which are deposited polyimide?? etalon transducers. Such a design would allow for a flexible and compact high-resolution imager well-suited for intravascular applications, such as guidance of treatment in the case of chronic total occlusion.
机译：在这项工作中，我们通过将光吸收性聚酰亚胺薄膜集成到Fabry ?? P ?? rot（标准具）高频接收器中，设计，制造和测试了全光学超声换能器。使用5 ns的UV脉冲在聚酰亚胺薄膜中产生热弹性超声，并且该传输具有以27 MHz为中心的最大振幅为4.3 MPa的振幅，分数带宽为107％。在仅接收模式下，该设备的等效噪声压力为1.3 Pa / Hz。在脉冲回波模式下使用时，发射/接收响应的6-dB上限频率达到47 MHz。还通过扫描整个设备上的近红外探测光束以创建一个2λ英寸的透镜来研究基本成像功能。 2毫米合成孔径。放置在深度为1.8和5.2 mm的目标的成像得出，横向分辨率的估计值分别为71和145Ωm，轴向分辨率的估计值分别为35和38Ωm。最后，提出了一种用于前视血管内成像器的设计概念，该概念需要将光耦合到旋转的线性光纤阵列，并在光纤的顶部沉积聚酰亚胺。标准具传感器。这种设计将允许一种灵活且紧凑的高分辨率成像仪，非常适合血管内应用，例如在慢性完全闭塞的情况下指导治疗。

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