【摘要】 提出一种基于铝片的测量温度和流速的光纤布喇格光栅(FBG)传感器。采用一种耐高温胶将光纤布喇格光栅封装在一小铝片上,经过高温固化处理,可保持光纤光栅传感器的稳定性。通过-20℃~100℃温度实验,得到该传感器的温度灵敏度系数为0.039 2 nm/℃,是封装前的3.5倍,且传感器温度响应保持了很好的线性和重复性。从水温14.5℃时的流速实验中得到水流速在0~20 m/s范围变化时,FBG峰值波长漂移了0.13 nm,验证了此光纤光栅传感器测量流速的可行性。试验结果表明,该传感器既可以作为温度传感器,又可以作为流量传感器,并且制作简单,成本较低。更多还原

【Abstract】 A novel aluminum plate based fiber Bragg grating(FBG) sensor is proposed to detect temperature and flow-velocity.Fiber Bragg grating(FBG) was sealed on an aluminum plate by a high-temperature-resistant glue,then placed in a thermostat for solidification so as to retain the stability of FBG.The temperature and flow-velocity sensing characteristics of the encapsulated FBG sensor were theoretically and experimentally studied.Encapsulated FBG sensor was placed in a digital thermostat to detect its temperature characteristics.In the temperature range of-20℃～100℃,the experiment result indicates that the temperature sensing sensitivity coefficient of encapsulated FBG sensor is(0.0392)nm/℃ and is 3.5 times as much as that of bare FBG.The temperature response curve of the encapsulated FBG sensor keeps very good linearity and repetition.In the flow-velocity experiment,the reflection peak-wavelength of the encapsulated FBG sensor moved 0.13nm when the flow-velocity changed from 0 to 20m/s with constant water temperature at 14.5℃.So it is feasible to use the encapsulated FBG sensor to detect the flow-velocity.The result proves that the aluminum plate encapsulated FBG sensor can detect temperature and flow-velocity.The encapsulated FBG sensor is easy to make,cost effective and practical.更多还原