一种测量温度和流速的光纤光栅传感器

Fiber Bragg grating sensor for detecting temperature and flow-velocity

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0．0392nm／℃，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0～20m／s范围变化时，FBG峰值波长漂移了0．13nm，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。

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. 039 2 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 peakwavelength of the encapsulated FBG sensor moved 0. 13 nm when the flow-velocity changed from 0 to 20 m/s with constant water temperature at 14. 5 C. 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.