关键词: 光纤布拉格光栅, 围岩位移, 分布式传感

Abstract: The fiber Bragg grating displacement sensor which based on cantilever structure connected by force conduct rod forms fiber Bragg displacement sensor link string by connecting head and end. It dismisses impact on the adjacent displacement meters by the springs installed under the flange. And it's worthy noting that the impact on the displacement meters from temperature is dismissed by the grating attached on the up and down side of the sensitive area of the cantilever, and we get the corresponding relation between grating's wave length and displacement. After the onsite comparison test, we found this displacement sensor can realize the aim of installing multiple instruments in the small hole at the same time.

Key words: fiber Bragg grating, displacement of surrounding rock, distributed sensing