A Photoacoustic Sensing Probe Based on Silicon Acoustic Delay Lines
A Photoacoustic Sensing Probe Based on Silicon Acoustic Delay Lines
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DOI：
10.1109/jsen.2021.3103932
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发表时间：
2021-10
影响因子：
4.3
通讯作者：
A. Ustun;Jun Zou
中科院分区：
文献类型：
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作者：
A. Ustun;Jun Zou
本文报道了一种基于硅声延迟线（SADLs）的新型光声传感（PAS）探头的设计。它由用于光传输的光纤和两个用于检测/将生成的PA信号中继到外部接收换能器的sadl组成。超声测试表明，在17~20 MHz范围内，声信号可以沿sadl低损耗传输。为了提高声源激发效率，在光纤的远端形成一个倾斜的尖端，使光照明区与声源激光器的声探测区对齐。采用高分辨率3d打印技术制造的新型聚合物微连接器用于保持探头组件的机械稳定性和隔声性。为此，设计并制作了SADL-PAS探针样机。其PA感测性能（如灵敏度、线性度和深度分辨率）被表征。测试结果表明，SADL-PAS探针提供了卓越的灵敏度和相当大的高频改进。在鸡胸肉中进行了离体试验，以证明PA在生物组织中的靶标检测。
In this paper, we report new photoacoustic sensing (PAS) probe design based on silicon acoustic delay lines (SADLs). It consists of an optical fiber for light delivery and two SADLs for detecting/relaying the generated PA signals to an outside receiving transducer. Ultrasound testing shows that acoustic signals can be transmitted along the SADLs with low loss up to 17~20 MHz. To improve the PA excitation efficiency, a beveled tip is formed at the distal end of the optical fiber to align the optical illumination region with the acoustic detection zone of the SADLs. New polymer micro linkers fabricated with high-resolution 3-D printing are used to maintain the mechanical stability and acoustic isolation within the probe assembly. For demonstration, a prototype SADL-PAS probe was designed and fabricated. Its PA sensing performance (e.g., sensitivity, linearity, and depth resolution) is characterized. Testing results show that the SADL-PAS probe provides superior sensitivity with considerable high-frequency improvement. Ex-vivo tests in the chicken breast are conducted to demonstrate the PA target detection in biological tissues.