Real-Time Optical Fiber Salinity Interrogator Based on Time-Domain Demodulation and TPMF Incorporated Sagnac Interferometer

Lin, Weihao1,2; Zhao, Fang3; Hu, Jie3; Liu, Yuhui3; Xu, Renan1,2; Chen, Xingwei3; Shao, Liyang3,4

2024-08-01

10.3390/s24165339

SENSORS   影响因子和分区

1424-8220

A novel demodulation scheme for a point-type fiber sensor is designed for salinity concentration monitoring based on a Sagnac interferometer (SI) composed of a tapered polarization-maintaining fiber (TPMF) and optical time stretching technology. The SI, constructed using a PMF with a taper region of 5.92 mu m and an overall length of 30 cm, demonstrated a notable enhancement in the evanescent field, which intensifies the interaction between the light field and external salinity. This enhancement allows for a direct assessment of salinity concentration changes by analyzing the variations in the SI reflection spectra and the experimental results indicate that the sensitivity of the sensor is 0.151 nm/parts per thousand. In contrast to traditional fiber optic sensors that depend on spectral demodulation with slower response rates, this work introduces a new approach where the spectral shift is translated to the time domain, utilizing a dispersion compensation fiber (DCF) with the demodulation rate reaching up to 50 MHz. The experimental outcomes reveal that the sensor exhibits a sensitivity of -0.15 ns/parts per thousand in the time domain. The designed sensor is anticipated to play a pivotal role in remote, real-time monitoring of ocean salinity.

salinity monitoring Sagnac interferometer tapered polarization-maintaining fiber optical time stretching technology dispersion compensation fiber

SCI

英语

通讯

Science, Technology and Innovation Commission of Shenzhen Municipality["20220815121807001","PCL2021A14-B1"] ; null[2022] ; null[22]

Chemistry ; Engineering ; Instruments & Instrumentation

Chemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation

WOS:001305655900001

MDPI

Web of Science

1.Xiamen Inst Technol, Higher Educ Key Lab Flexible Mfg Equipment Integra, Xiamen 361021, Peoples R China
2.Xiamen Inst Technol, Sch Mech Elect & Informat Engn, Xiamen 361021, Peoples R China
3.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
4.Peng Cheng Lab, Shenzhen 518005, Peoples R China

Lin, Weihao,Zhao, Fang,Hu, Jie,et al. Real-Time Optical Fiber Salinity Interrogator Based on Time-Domain Demodulation and TPMF Incorporated Sagnac Interferometer[J]. SENSORS,2024,24(16).

Lin, Weihao.,Zhao, Fang.,Hu, Jie.,Liu, Yuhui.,Xu, Renan.,...&Shao, Liyang.(2024).Real-Time Optical Fiber Salinity Interrogator Based on Time-Domain Demodulation and TPMF Incorporated Sagnac Interferometer.SENSORS,24(16).

Lin, Weihao,et al."Real-Time Optical Fiber Salinity Interrogator Based on Time-Domain Demodulation and TPMF Incorporated Sagnac Interferometer".SENSORS 24.16(2024).