In this paper, we present a miniature fluidic flow sensor based on a short fiber Bragg grating inscribed in a single mode fiber and heated by Co2+-doped multimode fibers. The proposed flow sensor was employed to measure the flow rates of oil and water, showing good sensitivity of 0.339 nm/(m/s) and 0.578 nm/(m/s) for water and oil, flowing at v = 0.2 m/s. The sensitivity can be increased with higher laser power launched to the Co2+-doped multimode fibers. A small flow rate of 0.005 m/s and 0.002 m/s can be distinguished for a particular phase of water or oil, respectively, at a certain laser power (i.e. similar to 1.43W). The flow sensor can measure volume speed up to 30 L/min, which is limited by the test rig. The experimental results show that the sensor can discriminate slight variation of flow rates as small as 0.002m/s.
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机译：在本文中，我们提出了一种基于短纤维布拉格光栅的微型流体流量传感器，该短纤维布拉格光栅刻在单模光纤中，并被掺有Co2 +的多模光纤加热。拟议的流量传感器用于测量油和水的流速，在v = 0.2 m / s时显示出对水和油的良好灵敏度，分别为0.339 nm /（m / s）和0.578 nm /（m / s） 。可以通过向掺Co2 +的多模光纤发射更高的激光功率来提高灵敏度。在一定的激光功率（即类似于1.43W）下，对于水或油的特定相，可以分别区分出0.005 m / s和0.002 m / s的小流速。流量传感器可以测量最高30 L / min的体积速度，这受测试设备的限制。实验结果表明，该传感器可以分辨出流量的微小变化，小至0.002m / s。
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