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提出一种基于靶式结构和悬臂梁结合的新型流量/温度同时测量的光纤Bragg光栅(FBG)传感器。当流体流过传感器,流速的变化引起圆形靶产生应变,应变传递到等强度悬臂梁1上,进而引起粘贴其上的FBG1波长发生改变,而粘贴在悬臂梁2上的FBG2波长不发生改变;流体温度发生变化会引起FBG1、FBG2波长同时发生改变,且波长改变相同;通过测量两光栅的波长,得到流体的流量和温度。在水和蓖麻油实验得到:传感器的流量测量范围分别是400～2200cm3/s和700～1800cm3/s,温度测量范围是0～100℃。
A novel fiber Bragg grating (FBG) sensor based on the combination of target structure and cantilever beam is proposed. When the flow of fluid through the sensor, the flow rate changes caused by the circular target strain, strain transmitted to the cantilever beam 1, which caused the paste FBG1 wavelength change, while the FBG2 attached to the cantilever beam 2 does not change the wavelength ; Changes in fluid temperature will cause FBG1, FBG2 wavelength changes at the same time, and the same wavelength change; by measuring the wavelength of the two gratings to get the fluid flow and temperature. Experiments on water and castor oil show that the flow rate of the sensor is 400 ~ 2200cm3 / s and 700 ~ 1800cm3 / s, respectively. The temperature measurement range is 0 ~ 100 ℃.