三分量光弹光纤加速度传感器弹性系统

为提高三维地震勘探的分辨率和精度，设计了一种新型的三分量光弹光纤加速度传感器，对加速度的敏感由光弹晶体、质量块、复合臂弹簧片构成的弹性系统实现．为消除三分量光弹光纤加速度传感器中与质量块运动方向不平行的运动的干扰，弹性系统设计为线性系统．对弹性系统的线性响应、频率特性进行了理论和实验研究．设计制作并实验了线性度良好的复合臂弹簧片，其相对非线性误差小于0．01，光弹晶体采用对加速度的变化在宽度方向获得良好线性响应的各向同性聚碳酸酯材料．以该弹性系统为基础的传感器，在0～3000Hz的频率范围可精确测量0～50m／s^2的加速度．

Spring System of Three-Component Photoelastic Fiber Optic Accelerometer

In order to improve the resolution and accuracy of 3-D seismic exploration, a novel type of three-component photoelastic fiber optic accelerometer is designed. Spring system of the accelerometer, which senses acceleration, is composed of spider springs, mass and photoelastic material. In order to eliminate or minimize the interference of any motion from a direction not parallel to the axis of movement of the mass in the accelerometer, the linear spring system in the accelerometer is designed. The linear response and the frequency characteristic of the spring system are studied theoretically and experimentally. Spider spring is designed and tested to achieve desired linearity. The relative non-linearity error of spider springs is less than 0.01. Polycarbonate, which has excellent linear response for wider elements, is considered as the photoelastic material. With the sensor based on the spring system, the acceleration from 0 to 50 m/s~2 can be accurately measured in the frequency from 0 Hz to 3 000 Hz.