【摘要】 基于光强调制原理以及耦合效率与纵向偏移距离的关系,设计出了一种新型的光纤加速度传感器,突破传统加速度传感器检测技术要求,实现高精度、高灵敏度以及具有快速响应能力。在发射光纤发射光功率不变的情况下,接收光纤的位置随系统振动而上下微动,从而导致接收的光功率发生变化。实验得到了在接收光纤位移量由0~40μm变化范围内接收光功率的变化规律和光功率随位移变化的拟合曲线。当接收光纤位移量为0时,两根接收光纤接收到的光功率大小相等;当位移量达到40μm时,两根接收光纤的光功率差达到最大,模场分布差别最明显。实验研究了光纤加速度传感系统的频率响应特性,得到了光纤加速度传感器频率响应特性曲线。在同一实验平台上,通过与标准加速度计的测量数据对比,验证了本文光纤加速度传感器测量性能的有效性和可靠性。更多还原

【Abstract】 Based on the principle of light intensity modulation and the relationship between coupling efficiency and vertical offset distance,a new kind of optical fiber acceleration sensor is designed.And it breaks through the requirements of traditional acceleration sensor detection technology to get a high precision,a high sensitivity and a fast response ability.Under the condition of invariable launching fiber optical power,the position of receiving optical fiber has micro change according to the system vibration which leads a variation of receiving light power.The changing rules of receiving light power and the fitting curve of the relation between light power and displacement with the displacement of receiving optical fiber ranging from 0to 40μm are obtained.When the displacement of receiving optical fiber is 0,is the light powers in two receiving optical fibers are equal.When displacement reaches 40μm,the optical power difference of two receiving optical fiber achieves the maximum,and also the mode field distribution shows the most obvious difference.This experiment studies the frequency response characteristics of optical fiber acceleration sensor system,and the fiber optic accelerometer frequency response characteristic curve is obtained.In the same experiment platform,the effectiveness and reliability of the fiber optic accelerometer measurement performance are verified by comparing with standard accelerometer measurement data.更多还原