基于光纤阵列的气流传感方法研究

提出了一种基于光纤光栅阵列的光纤气流传感器。单模光纤光栅的栅区长度为10 mm,将三根光纤光栅均匀环绕布设于硅胶基体。传感器外界环境温度以及气流流速的改变都会引起传感器反射谱的变化。通过监测反射谱可以实现对外界物理量的测量。实验分析可知,硅胶基体与光纤光栅有着很好的耦合效果,通过改变硅胶基体的长度使得传感器的传感特性得到有效改善。实验研究结果表明,在正常室温情况下,传感器的中心波长漂移量与流速成二次函数关系且传感器具有方向传感特性。本文提出的光纤阵列气流传感器结构紧凑、制作工艺简单、可靠性高。

Study on airflow sensing method based on fiber array

A fiber optic airflow sensor based on fiber grating array is proposed.The length of the gate region of the single-mode fiber grating is 10 mm,and the three fiber gratings are evenly distributed around the silica gel substrate.The changes of the ambient temperature and flow velocity can cause changes in the reflectance spectrum of the sensor.By monitoring the reflectance spectrum,the physical quantity of the outside can be measured.Experimental analysis shows that the silica gel matrix has a good coupling effect with the fiber grating.By changing the length of the silica matrix,the sensing characteristics of the sensor are effectively improved.The experimental results show that under normal room temperature conditions,the sensor′s central wavelength drift is quadratic with the flow velocity and the sensor has directional sensing characteristics.The fiber array airflow sensor proposed in this paper is compact in structure,simple in manufacturing process and with high reliability.