A Multifunctional Airflow Sensor Enabled by Optical Micro/nanofiber
A Multifunctional Airflow Sensor Enabled by Optical Micro/nanofiber
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DOI：
10.1007/s42765-021-00097-5
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发表时间：
2021-09
影响因子：
16.1
通讯作者：
Zhang Zhang-Zhang;Yuran Kang;Ni Yao;Jing Pan;Wen-cheng Yu;Yao Tang;Yue Xu;Liqiang Wang;Lei Zhang
中科院分区：
文献类型：
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作者：
Zhang Zhang-Zhang;Yuran Kang;Ni Yao;Jing Pan;Wen-cheng Yu;Yao Tang;Yue Xu;Liqiang Wang;Lei Zhang
光纤风速计具有灵敏度高、动态范围宽、功耗低、抗电磁干扰等优点，在过去的十年中受到越来越多的关注。然而，昂贵的仪器可能会限制其实际应用。本文提出并实现了一种新型的基于光学微纳管（MNF）的气流传感器。传感元件是一个柔性的聚二甲基硅氧烷（PDMS）悬臂嵌入一个U形的MNF。在暴露于气流中时，悬臂梁的诱导偏转导致嵌入式MNF的弯曲相关的透射率变化。传感器的性能可以通过调整悬臂厚度和/或MNF直径来设计。当四个悬臂梁沿两个正交方向排列时，每个悬臂梁的透射率将取决于流速和方向。通过对四个传感器输出信号的分析，实验测量了流速在15 m/s以内的全方位气流。此外，还可以使用分辨率为0.012 m/s的优化悬臂梁实时监测和区分各种语音和呼吸信号，为健康监测应用提供了巨大的潜力。
Fiber-optic anemometers have attracted an increasing attention over the past decade owing to their high sensitivity, wide dynamic range, low power consumption, and immunity to electromagnetic interference. However, expensive instruments may limit their practical applications. Herein, a new type of airflow sensor based on optical micro/nanofiber (MNF) is proposed and realized. The sensing element is a flexible polydimethylsiloxane (PDMS) cantilever embedded with a U-shaped MNF. Upon exposure to airflow, the induced deflection of the cantilever results in a bending-dependent transmittance variation of the embedded MNF. The performance of the sensor can be engineered by tuning the cantilever thickness and/or the MNF diameter. When four cantilevers are arranged in two orthogonal directions, the transmittance of each cantilever will be dependent on both flow speed and direction. By analysing the output signals of the four cantilevers, omnidirectional airflow with flow speed within 15 m/s were experimentally measured. In addition, a variety of voice and respiratory signals can be monitored and distinguished in real-time using an optimized cantilever with a resolution of 0.012 m/s, presenting great potential for health monitoring applications.Graphic abstract