摘要
本文设计并制备了一种单模-D型-多模光纤结构,利用光纤传导模式间的干涉以及D型光纤的非对称结构,获得对外界变化响应极其灵敏的光斑图,并基于纹理特征算法解调出光斑的特征值,由特征值与折射率之间的一一对应关系实现折射率传感。对传感特性的研究中,从仿真与实验的角度讨论了不同抛磨长度、抛磨深度对传感特性的影响,仿真与实验结果均表明,抛磨长度2 mm和抛磨深度18μm参数的D型光纤结构折射率传感特性最佳,仿真与实验结果一致,证明了研究方法的正确性以及D型光纤光斑传感器进行折射率传感的可行性。实验中,能量值(EN)折射率测量灵敏度最高可达-1.86/RIU,拟合度达到0.964,相关性值(COR)折射率检测灵敏度最高可达-0.23/RIU,拟合度达到0.979。由于光斑检测的分辨力极高,因此,该方法为高分辨力折射率测量提供了很好的思路。
In this article,a single mode-D-type-multimode fiber structure is designed and fabricated.The interference among the guided modes and the asymmetrical structure of the D-type fiber can be utilized to obtain the specklegram,which is extremely sensitive to external changes,and the eigenvalues of the specklegram are demodulated based on the texture feature algorithm.The refractive index(RI)measurement could be achieved via the relationship between the eigenvalues and RIs.In the study of the RI sensing characteristics,the effects of different polishing lengths and polishing depths on the sensing characteristics are discussed from the point of view of simulation and experiment.Both the simulation and experimental results show that the D-type optical fiber structure with the parameters of polishing length 2 mm and polishing depth 18μm has the best refractive index sensing performance.The consistence between the simulation and experiment demonstrates the correction of the research method and the feasibility of the D-type fiber specklegram sensor for RI sensing.The maximum RI sensitivity of the EN reaches-1.86/RIU,and the fitting degree reaches 0.964.The maximum RI sensitivity of the COR reaches-0.23/RIU,and the fitting degree reaches 0.979.
作者
蔡露
李尚文
王敏
赵勇
Cai Lu;Li Shangwen;Wang Min;Zhao Yong(College of Control Engineering,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;Key Laboratory of Micro-Nano Precision Optical Sensing and Detection Technology of Hebei Province,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;State Key Laboratory of Integrated Automation for Process Industry,Northeastern University,Liaoning 100819,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2022年第10期118-127,共10页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(61803076)
河北省高等学校科学技术研究项目重点项目(ZD2020406)
教育部中央高校基本科研服务费(N2123011)
河北省自然科学基金(F2022501028)项目资助。
关键词
折射率传感器
光纤光斑图
D型光纤
纹理特征算法
refractive index sensor
fiber specklegram
D-type fiber
texture feature algorithm
