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提出了一种能够测量高温的光纤布拉格光栅(FBG)传感器结构。利用线膨胀系数和长度均不同的两种金属细杆和光纤布拉格光栅设计而成的传感头,能够将被测温度转化为光栅的应变,解调由应变引起的光栅波长漂移,即可得知待测的温度。目前在实验室实现了500℃的动态范围和1℃的温度分辨率,实验结果与理论分析一致。
A fiber Bragg grating (FBG) sensor structure capable of measuring high temperature is proposed. By using two kinds of metal thin rods and fiber Bragg grating with different coefficients of linear expansion and length, the sensing head can convert the measured temperature into the strain of the grating and demodulate the grating wavelength drift caused by the strain, Know the temperature to be measured. Currently in the laboratory to achieve a dynamic range of 500 ℃ and 1 ℃ temperature resolution, the experimental results consistent with the theoretical analysis.