分布式光纤布拉格的温度测试

Test the temperature of the distributed fiber Bragg

本文针对目前温度测试方法只能测量单点温度的不足,提出了可以测量多点温度的分布式测量光纤,在一根光纤上按从小到大的顺序刻制多个不同中心波长的布拉格光栅,并对各个布拉格光栅进行了封装。当各点温度发生变化时,通过各个布拉格光栅反射回来的光栅中心波长发生偏移,通过检测发射光中心波长发生的偏移量可以确定光栅温度变化的范围。实验结果表明:在20～70℃的温度范围内,FBG的中心波长随温度变化呈良好的线性,线性度可达99.6%以上。

This article can only measure the temperature test method for the lack of a single point temperature, the distributed measurement fiber optic multi-point temperature can be measured, the engraving of a number of different central wavelength of an optical fiber, the order from small to large Prague The grating, and each of the Bragg grating of the package. When the temperature of each point is changed, the grating center wavelength is reflected back through the respective Bragg grating offset occurred and the offset occurs by detecting the emission wavelength of the optical center can determine the scope of the grating temperature change. Experimental results show that ： the center wavelength of the FBG changes with temperature within a temperature range of 20 to 70 ℃, showed a good linear, linearity, up to more than 99.6%.