基于光纤布拉格光栅的流量温度复合传感研究

Research on flow and temperature composite sensing based on fiber Bragg grating

针对传统流量计测量参数单一和流量温度复合测量困难的问题,提出了一种基于光纤布拉格光栅的流量温度复合传感器。采用空心圆柱悬臂梁,减小了流体的压力损失,对端盖、悬臂梁和靶盘采用一体加工,增加了传感器的稳定性。首先,结合光纤布拉格光栅传感理论和流量温度复合传感理论,研究了基于光纤布拉格光栅的流量温度复合传感机理;然后,设计了悬臂梁为空心圆柱的一体靶式结构的传感器,并进行了仿真分析研究;最后,搭建了流量温度实验系统平台,进行了温度和流量传感实验。研究结果表明,温度与波长漂移量呈线性变化关系,线性度均在99%以上,传感器对温度的分辨率为0.04℃,温度测量误差为1.8%,流量分辨率为0.33 m^(3)/h,流量测量误差为2%。该光纤布拉格光栅复合传感器可实现对流量和温度的复合测量,有望于应用在需要大规模组网检测的流量测量系统中,具有较好的应用前景。

Aiming at the problem of single parameter of traditional flow meter and problem of composite measurement of fluid flow and temperature,a composite flow and temperature sensor based on fiber Bragg grating is proposed.The pressure loss of fluid is reduced by using hollow cylindrical cantilever beam.The end cover,cantilever beam and target plate are processed in one body,which increases the stability of the sensor Firstly,sensing theory of fiber Bragg grating and flow-temperature are combined.The flow and temperature composite sensing theory based on fiber Bragg grating is studied.Then,the sensor that integrated target structure with the cantilever beam of hollow cylinder is designed.And its performance is simulated.Finally,the flow and temperature experimental system platform is set up.The sensing of temperature and flow experiments are carried out on the sensor.The results show that the relationship between temperature and wavelength shift is linear.The linearity is above 99%.The temperature resolution of the sensor is 0.04℃,the temperature measurement error is 1.8%,the flow resolution is 0.33 m^(3)/h,and the flow measurement error is 2%.The fiber Bragg grating composite sensor can realize composite measurement of flow and temperature,and is expected to be applied to a flow measurement system requiring large-scale network detection,and has a good application prospect.