一种采用Ge/P光纤的强度调制型温度传感器

An intensity modulated temperature sensor using Ge/P fiber

提出一种基于稳定的光纤辐射致衰减（RIA）温度依赖性的新型光纤温度传感器。用辐照并充分退火后的光纤制作传感头，搭建光纤温度传感系统进行测试。建立温度和光纤RIA的模型，并对光纤温度传感器的灵敏度、线性度和重复性进行分析。结果发现，在-40～60℃温度范围内，辐照并充分退火后的Ge／P掺杂光纤在850nm波段的RM具有单调稳定的温度依赖性。通过比较850nm和1310nm波段的RIA温度特性发现，光纤RIA的温度特性具有波长依赖性，且850nm波段的温度灵敏度要远远优于1310nm波段。验证了基于850nm波段的光纤RIA温度依赖性的光纤温度传感器的可行性。用18m辐照并充分退火后的Ge／P光纤搭建的光纤温度传感器，其灵敏度为0．0068dB／℃，最大绝对误差为1℃，分辨率为0．15℃，线性误差为±3．04％，重复性误差为1．04％。

An all fiber-optic temperature sensor utilizing stable temperature dependence of radiation induced attenuation （RIA） in fiber is proposed. The irradiated fiber after sufficient annealing is used to make sensing head. The test system of temperature sensor is built up to test temperature change of irradfated optical fiber after accelerated annealing at 70 . The model between temperature and RIA is built up. The characteristics of the temperature sensor are analyzed from. several aspects, such as measuring range,sensitivity, linearity and repeatability. The attenuation at 850 nm of irradiated Ge/P fiber after sufficient annealing exhibits monotonic and remarkable temperature dependence in the range from -40 ℃ to 60 ℃. It can be seen that the temperature behavior of RIA shows wavelength dependence by analyzing the temperature behavior of RIA at 850 nm and 1310 nm. The temperature sensitivity of Ge/P codoped fiber at 850 nm is better than that at 1310 nm. The temperature sensor based on radiation-induced attenuation at 850 nm is feasible. The developed temperature sensor with 18 m irradiated fiber has an average value sensibility of 0. 006 8 dB/℃. The maximum absolute error is 1 ℃ ,the resolution is 0.15℃, the nonlinearity error is ±3.04 %, and the repeatability error is 1.04 %.