针对采用悬臂梁或变形圆环作为光纤光栅位移传感器的弹性形变结构时, 位移灵敏度较低的问题, 采用新型的椭圆位移放大机构对位移探杆的微小位移量进行放大, 改变椭圆放大器的机械尺寸调整传感器的位移分辨率.当椭圆位移放大机构的长度为60 mm, 宽度为19.8 mm, 中间最大宽度为30 mm时, 探杆的机械位移放大倍率约为2倍.当量程变化为0~100 mm时, 实验测得光纤光栅位移传感器的分辨率为6.1 pm/mm, 位移量和对应波长移动线性相关系数为0.998 52.适于机械装备和土木工程的结构位移高精度在线监测.

In order to solve the practical problem of low displacement sensitivity when a cantilever beam or deformed ring is used as an elastic deformation structure of a fiber Bragg grating displacement sensor, a new elliptical displacement amplification mechanism was chosen to amplify the mini-shifting of the displacement, and the displacement resolution of the sensor was adjusted by changing the mechanical size of the elliptical amplifier. When the length of the elliptical displacement amplifying structure is 60 mm, the width is 19.8 mm, and the maximum width in the middle is 30 mm, the magnification of the mechanical displacement is amplified by 2 times. When the range changes from 0 to 100 nm, the resolution of the fiber Bragg grating displacement sensor measured in the experiment is 6.1 pm/mm, and the linear correlation coefficient of displacement and corresponding wavelength shift is 0.998 52. The sensor can be effectively applied to high-precision on-line monitoring for structural displacement of mechanical equipment and civil engineering.