| WANG Jiahui,WEI Xian,ZHU Yan,SHEN Yue,PANG Lipeng,DUAN Shaoxiang.Seawater temperature and salinity sensing based on in-fiber Michelson-Fabry-Perrot hybrid interferometer employing frequency domain decomposition method[J].Optoelectronics Letters,2024,(2):70-75 |
| Seawater temperature and salinity sensing based on in-fiber Michelson-Fabry-Perrot hybrid interferometer employing frequency domain decomposition method |
| Author Name | Affiliation | | WANG Jiahui | Institute of Modern Optics, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Nankai University, Tianjin 300350, China | | WEI Xian | Foreign Cooperation Projects Department of PetroChina Dagang Oilfield Company, Tianjin 300280, China | | ZHU Yan | Foreign Cooperation Projects Department of PetroChina Dagang Oilfield Company, Tianjin 300280, China | | SHEN Yue | Foreign Cooperation Projects Department of PetroChina Dagang Oilfield Company, Tianjin 300280, China | | PANG Lipeng | The 58th Research Institute of China Electronics Technology Group Corporation, Wuxi 214035, China | | DUAN Shaoxiang | Institute of Modern Optics, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Nankai University, Tianjin 300350, China
Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai 519000, China |
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| Abstract: |
| 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. |
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