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提出了一种基于FBG(布拉格光纤光栅)温度传感器封装的新设计方案。一个密闭的容器被活塞分成两部分,一部分充满水银,另一部分抽成真空,两个完全一样的布拉格光纤光栅分别安装在活塞两边。当温度发生变化时,通过水银的热胀冷缩推动活塞移动,把温度的变化通过水银热胀冷缩转换成对光纤光栅的拉力和压力。而光纤光栅和金属外壳本身的热胀冷缩对两段布拉格光栅的影响是相同的,基本上可以相互抵消,因此,消除了温度和应力交叉敏感的问题。另外,理论分析表明该布拉格光纤光栅传感头的温度灵敏度可以达到2.83×10-4/℃。
A new design scheme based on FBG (Bragg grating) temperature sensor package is proposed. A closed container is divided into two parts by the piston, one part filled with mercury and the other part drawn into a vacuum. Two identical Bragg fiber gratings are mounted on either side of the piston. When the temperature changes, the piston moves through the thermal expansion and contraction of mercury, and changes the temperature into the tension and the pressure of the fiber grating by the thermal expansion and contraction of mercury. The thermal expansion and contraction of the fiber grating and the metal shell itself have the same effect on the two-stage Bragg grating, and can basically cancel each other. Therefore, the problems of temperature and stress cross-sensitivity are eliminated. In addition, the theoretical analysis shows that the Bragg fiber grating sensing head temperature sensitivity can reach 2.83 × 10-4 / ℃.