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提出了一种基于“钢管-质量块”弹性结构体的光纤光栅(FBG)加速度传感器,4个光纤光栅粘贴在质量块一侧的钢管表面应变的最大处,光栅分布在沿钢管圆周呈90°方位角的位置上,粘贴方向沿钢管的轴向。通过两两组合的光栅对的波长变化量的差值感测弹性结构体不同方向的振动加速度,实现二维测量及温度补偿。使用有限元软件进一步分析说明了传感器的测量原理及谐振频率。传感器性能参数测试结果表明,该传感器谐振频率为515Hz,与有限元分析结果基本吻合,灵敏度为0.88pm·m-1·s2,加速度测量范围为15～75m/s2;传感器二维振动测试结果良好,具备较好的抗干扰振动能力。
A fiber grating (FBG) accelerometer based on a “steel tube-mass” elastic structure was proposed. Four FBGs were attached to the maximum strain at the surface of the steel tube. The gratings were distributed along the circumference of the steel tube 90 ° azimuth position, paste the direction along the axial direction of the steel pipe. Two-dimensional measurement and temperature compensation are realized by sensing the vibration acceleration in different directions of the elastic structure by the difference between the wavelength variations of the grating pairs in any combination. The finite element software was used to further analyze the measuring principle and resonant frequency of the sensor. The test results of the sensor performance parameters show that the resonant frequency of the sensor is 515Hz, which basically agrees with the finite element analysis results, the sensitivity is 0.88pm · m-1 · s2 and the acceleration measurement range is 15 ~ 75m / s2; the two-dimensional vibration test result of the sensor is good , Have better anti-jamming vibration ability.