摘要
报导了一种基于级联保偏光纤(PMF)和长周期光纤光栅(LPFG)的Sagnac环温度和环境折射率双参量传感器。在Sagnac干涉环内级联PMF和LPFG,LPFG的双折射效应使得Sagnac干涉的相位差受环境折射率调制。所提出的双参量传感器的透射光谱中,由LPFG形成的透射峰和Sagnac干涉形成的干涉峰对温度和环境折射率各自具有不同的灵敏度,通过对两者特征峰波长漂移量的测量就可实现对温度和环境折射率的同时传感。实验上搭建了温度和环境折射率双参量测试装置,采用波长解调方法,受光源功率波动的影响小,温度灵敏度为1.2nm/℃;环境折射率灵敏度为15nm/RIU。该双参量传感方案解决了温度和环境折射率的交叉敏感问题,结构简单,采用金属板凹槽结构进行封装有效地保护了LPFG,在生物传感和化学传感等领域具有广阔的应用前景。
This paper proposes a novel sensor scheme for simultaneously achieving temperature and surrounding refractive index（RI）based on a Sagnac loop composed of a long period grating（LPFG）and polarization maintaining fiber（PMF）.The LPFG and PMF are embedded in Sagnac fiber loop,and the Sagnac interference phase difference is sensitive to the surrounding RI thanks to the LPFG′s birefringence.The transmission dip formed by the LPFG and the interference dips formed by the whole Sagnac fiber loop have different sensitivities to temperature and surrounding RI.Therefore,temperature and surrounding RI can be simultaneously measured by monitoring the wavelength shifts of the transmission dip and the interference dips.A dual-parameter testing device for temperature and surrounding RI is experimentally built,and has small source power perturbations by wavelength demodulation.The temperature sensitivity can reach 1.2nm/℃,and the surrounding RI sensitivity is 15nm/RIU.This proposed sensor with simple structure eliminates the cross-sensitivity of temperature and RI,has metallic package to protect the LPFG and potential applications in the chemical and biological field.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2017年第1期25-31,共7页
Journal of Optoelectronics·Laser
基金
天津市科技支撑项目(14ZCZDGX00030,13ZCZDSF02300)
高等学校博士学科点专项科研基金(20120032110053)资助项目
