计数式光纤Bragg光栅风速仪设计

为消除温度波动变化对风速测量带来的影响，能更有效、稳定地测量风速，设计一种计数式光纤Bragg光栅（ FBG）风速仪。风速仪采用风杯结构，在风杯转轮上设置转速凸轮，粘贴有FBG的等强度悬臂梁与转速凸轮组成计数装置。基于风杯转速与风速呈线性关系建立了传感模型，根据中心波长变化次数进行计数，从而计算出风速，实现了对风场内风速实时监测。风洞试验表明：计数式FBG风速传感器的起动风速为0.9 m/s，线性度为6%，灵敏度为0.65 r/m。

Design of fiber Bragg grating anemometer using principle of number counting

To eliminate influence of temperature fluctuations on wind speed measurement with anemometer,design a kind of fiber Bragg grating( FBG)anemometer using principle of number counting effectively and stably measure wind speed. This kind of anemometer has a wind cup,which has a speed cam,and the counting device consists of speed cam and a balanceable cantilever on which FBG is pasted. Based on linear relationship between wind speed and revolving speed of the wind cup,build sensing model,then can calculate according to numbers of central light wave changes,calculate wind speed and monitor wind speed live in the aim area. Wind tunnel experiments show that wind speed sensor using principle of number counting start up wind speed is 0. 9 m/s,linearity is 6% and sensitivity is 0. 65 r/m.