Seawater temperature and salinity sensing based on in-fiber Michelson-Fabry-Perrot hybrid interferometer employing frequency domain decomposition method  

作　　者：WANG Jiahui WEI Xian ZHU Yan SHEN Yue PANG Lipeng DUAN Shaoxiang 

机构地区：[1]Institute of Modern Optics,Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology,Nankai University,Tianjin 300350,China [2]Foreign Cooperation Projects Department of PetroChina Dagang Oilfield Company,Tianjin 300280,China [3]The 58th Research Institute of China Electronics Technology Group Corporation,Wuxi 214035,China [4]Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519000,China1

出　　处：《Optoelectronics Letters》2024年第2期70-75,共6页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62275131,62231005 and 62105164);the Natural Science Foundation of Tianjin(Nos.21JCQNJC00210,22JCQNJC01540 and 21JCYBJC00080)。

摘　　要：We propose an in-fiber Michelson-Fabry-Perrot(M-FP)hybrid interferometer for the simultaneous measurement of seawater temperature and salinity.The sensor head consists of two parallel hetero Fabry-Perot(FP)cavities fabricated on the end face of the twin core fiber(TCF).A fiber fusion taper is used to split and recouple the light in the two cores.In this case,the Vernier effect can be obtained which can greatly enhance the sensitivity and solve the problem of temperature cross-sensitivity.Different from the traditional demodulation method based on envelop detection,we employed frequency domain decomposition method(FDDM)to demodulate the sensing signal.The simulation results indicate that the proposed sensor has high sensitivity to salinity and temperature.Thanks to the merits of high sensitivity,ease of fabrication and small footprint,the proposed seawater temperature and salinity sensor would have potential applications in marine science,food industry and ocean ranching.

关 键 词：temperature SALINITY ocean 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] P716.14[自动化与计算机技术—控制科学与工程]