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Macrobending SMS fiber-optic anemometer and flow sensor

机译：Macrobending SMS光纤风速计和流量传感器

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摘要

We report a simple, high sensitivity, good resolution and low-cost fiber-optic anemometer and flow sensor based on reflective single mode-multimode-single mode structure bent by air flow. The dragging force on the multi-mode section causes it to bend resulting in multimodal interference (MMI) effects which are related to the fluid velocity and flow rate. Bending effects on the output power profile are investigated and numerical simulation combined with experimental data demonstrate that the output power intensity may increase or decrease with the rise of curvature, depending on MMI conditions and field deformation. The sensor behavior with air flow velocity is evaluated by spectral analysis using a variety of methods as wavelength shifting of a selected peak and output power intensity of selected wavelength and output power intensity of selected points. Experimental tests using air stream inside a wind tunnel provided a reliable dynamic range from 4 to 10 m/s. Peak sensitivities of 435.13 pm/(m/s) with resolution of 17.4x10(-3) m/s for wavelength shifting and 2.62 dB/(m/s) for output power intensity are obtained. These results assure that the sensor can be effectively used in a wide variety of applications, such as anemometer and flow rate meter.
机译：我们报告了一种基于气流弯曲的反射型单模-多模-单模结构的简单，高灵敏度，高分辨率和低成本的光纤风速计和流量传感器。多模式部分上的拖曳力使其弯曲，从而导致与流体速度和流速相关的多模式干扰（MMI）效应。研究了弯曲对输出功率分布的影响，并结合实验数据进行了数值模拟，结果表明，根据MMI条件和场变形，输出功率强度可能随曲率的升高而增加或降低。使用各种方法通过光谱分析评估传感器在空气流速下的行为，例如选定峰的波长偏移，选定波长的输出功率强度和选定点的输出功率强度。使用风洞内部的气流进行的实验测试提供了4至10 m / s的可靠动态范围。获得的峰值灵敏度为435.13 pm /（m / s），对于波长移位的分辨率为17.4x10（-3）m / s，对于输出功率强度的分辨率为2.62 dB /（m / s）。这些结果确保了该传感器可以有效地用于各种应用中，例如风速计和流速计。

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