论文部分内容阅读
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。
Based on the principle of light intensity modulation and the relationship between the coupling efficiency and the vertical offset distance, a new type of optical fiber acceleration sensor is designed, which overcomes the technical requirements of traditional acceleration sensor detection and achieves high precision, high sensitivity and fast response. In the case of a constant transmission power of the transmitting optical fiber, the position of the receiving optical fiber fluctuates slightly with the system vibration, resulting in a change of the received optical power. The experimental results show that the variation of received optical power and the variation of optical power with displacement in the range of 0 ~ 40μm received fiber displacement are fitted by the fitted curve. When the receiving fiber displacement is 0, the optical power received by the two receiving optical fibers are equal. When the displacement reaches 40μm, the optical power difference between the two receiving optical fibers reaches the maximum, and the difference of mode field distribution is most obvious. The frequency response characteristics of optical fiber acceleration sensing system are experimentally studied, and the frequency response curve of optical fiber acceleration sensor is obtained. In the same experimental platform, compared with the standard accelerometer measurement data, verify the fiber optic acceleration sensor measurement performance of the effectiveness and reliability.