基于球形结构和少模光纤的干涉型温度传感器

Interferometric optical temperature sensor based on spherical structure and few-mode fiber

提出了一种基于球形结构和少模光纤的传感器。该传感器利用光纤熔接机将单模光纤熔成球形,再将少模光纤熔接在单模光纤和球形结构之间,通过实验可以观察到随着温度的升高,两个谐振波谷的波长分别向长波长方向漂移了1.26nm和1.05nm,且在30℃~70℃的温度变化范围内,线性拟合度为0.991和0.998,测出温度灵敏度为0.030nm/℃和0.035nm/℃。

An optical fiber sensor based on spherical structure and few mode fiber（FMF） is proposed. This in- terferometer is formed by sandwiching a segment of few mode fiber（FMF） between a segment of single mode fiber （SMF） and a spherical structure which is made by fiber fusion splicer. Experimentally, with the increase of temperature, the two interference valleys of the interferometer move 1.25nm and 1.05rim individually to the direction of long wavelength, and in the temperature range of 30 ℃-70℃, the linear goodness of fits are 0.991 and 0.998, the temperature sensitivitys are 0.030nm/℃ and 0.035 nm/℃.