基于光纤辐射效应的温度传感器工作波长研究

Study on working wavelength of temperature sensor based on optical fiber radiation effect

辐射后光纤的损耗值显著增加,这种现象被称为光纤辐射致衰减（RIA）效应。基于RIA效应的温度特性,搭建了一种新型的光纤温度传感器。为选择合适的传感器工作波长,基于位形坐标模型理论对锗磷（Ge/P）共掺杂光纤在825~1500 nm范围内的RIA谱特性进行了研究,发现短波段光纤RIA对温度的依赖性明显优于长波段。选用了常见的850 nm普通单模光纤作为敏感光纤,搭建光纤温度传感器,最后对所搭建温度传感器的性能指标做出了评估。

Attenuation of optical fiber will augment largely after irradiated, this phenomenon is called radiation induced attenuation（RIA）. A fiber temperature sensor is established based on temperature characteristics of RIA. To determine appropriate working wavelength, spectrum properties of temperature dependent RIA in irradiated fiber is analyzed according to configurational coordinate model. It is found that temperature dependence of RIA at short waveband is better than that at long waveband in spectrum range of 825 - 1500 nm. As a result, 850 nm is chosen as working wavelength because of its good monotony and sensitivity after sufficient annealing, and a series of confirmatory tests were done to evaluate its performance.