一种低成本的双光纤光栅加速度传感器

Low-cost Acceleration Sensor Based on Dual Fiber Optic Gratings

设计了一种基于矩形悬臂梁、双光纤光栅和强度测量方法的加速度传感器。作为传感核心部件的双光栅,它们的初始中心波长差必须为一个适当的值,使得反射光强度对中心波长差的变化率为最大。理论与实验一致表明,该光纤光栅加速度传感器的电压幅值正比于加速度幅值和悬臂梁中性面与水平面夹角的余弦,而传感器的灵敏度还与FBG的特征参数、矩形悬臂梁上测量点的应变变化率、光敏管的转换系数和放大电路的放大倍数等因素有关。

An acceleration sensor was designed based on rectangle cantilever beam structure,dual fiber Bragg gratings and light intensity measurement.The theoretical and experimental results consistently show that the amplitude of AC voltage is in proportional to the amplitude of acceleration and the cosine of the angle between the rectangle cantilever beam and horizontal plane.Its sensitivity is also related to the amplification factor of photosensitive tube and amplifier,the characteristic parameters of FBGs and cantilever frame.