基于啁啾光纤布拉格光栅的流速传感器

A novel flow velocity sensor based on chirped fiber Bragg grating

设计了一种基于啁啾光纤布拉格光栅(CFBG)的新型流速传感器,包括CFBG压强传感机构和文丘里管。压强传感机构中,密闭铝箔管横截面两边的压力差导致矩形悬臂梁变形,从而引起粘贴在悬臂梁侧边的CFBG的反射光谱带宽发生变化。通过检测其带宽,得到被测流体的速度。实验表明,CFBG反射光谱带宽对温度不敏感,流速传感器的动态测量范围为8-100mm/s,设计方案是切实可行的。

A novel flow velocity sensor based on a chirped fiber Bragg grating （CFBG） that includes the chirped fiber grating pressure sensing setup and Venturi tube has been proposed, aiming to increase the size and reduce the cost of the sensor system. The CFBG-based intensity-modulated sensor shows the potential applications in various sensing areas due to their many advantages. The relationship between the flow velocity and the bandwidth of the reflection spectrum of the chirped fiber Bragg grating is derived. The deformation of the rectangular cantilever beam is caused by the pressure on two sides of the cross section of the aluminum foil tube in the pressure sensing setup, and it results in the bandwidth change of the reflection spectrum of the chirped fiber Bragg grating that is mounted at the side of the cantilever. The flow velocity can be obtained by measuring the bandwidth of the reflection spectrum of the chirped fiber Bragg grating,which is not sensitive to the temperature. The experimental results verify the feasibility of the proposed sensor with a measurement range from 8 to 100 mm/s.