高精度强度调制型光纤温度传感技术研究

传统强度型光纤温度传感器由于灵敏度低和测量精度难以提高，导致走向应 用十分困难。本文对基于光纤端面菲涅尔反射的光纤温度传感原理进行了深入分 析，研究了构成反射界面的两种材料折射率温度系数对反射率的影响，提出了利 用相对反射率级进行温度测量的方法。仿真分析表明在选定参考温度点附近可以 得到较高的理论测量精度。针对菲涅尔反射型光纤温度传感器灵敏度较低的特点， 开发了一种高精度相对强度测量系统，采样基于光源内调制的脉冲自参考技术，有 效降低了噪声和多种干扰因素的影响。实验测得相对强度测量系统 2min 噪声达到 1.9 × 10−4 dB，2h 噪声达到 3.8 × 10−4 dB，且具有较高的开机重复性和长期稳定 性。实际制作了基于乙醇光纤界面的温度传感器，实测温度灵敏度为 0.036dB，温 度分辨率可达 0.0083°C，与理论结论一致。

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