Salinity Sensor Using a Tapered Polarization-Maintaining Fiber-Based Sagnac Loop in a Fiber Ring Laser with Support Vector Regression for Improved Accuracy.

Weihao Lin, Zihan Huang, Keyu Cai, Mingkun Zhang, Renan Xu, Yuhui Liu

Abstract read

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Article in Sensors (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

6 authors.

Weihao LinThe Higher Educational Key Laboratory for Flexible Manufacturing Equipment Integration of Fujian Province, Xiamen Institute of Technology, Xiamen 361021, China.ORCID 0000-0002-1499-2608

Zihan HuangThe Higher Educational Key Laboratory for Flexible Manufacturing Equipment Integration of Fujian Province, Xiamen Institute of Technology, Xiamen 361021, China.ORCID 0009-0004-7448-2804

Keyu CaiThe Higher Educational Key Laboratory for Flexible Manufacturing Equipment Integration of Fujian Province, Xiamen Institute of Technology, Xiamen 361021, China.

Mingkun ZhangThe Higher Educational Key Laboratory for Flexible Manufacturing Equipment Integration of Fujian Province, Xiamen Institute of Technology, Xiamen 361021, China.

Renan XuThe Higher Educational Key Laboratory for Flexible Manufacturing Equipment Integration of Fujian Province, Xiamen Institute of Technology, Xiamen 361021, China.

Yuhui LiuInstitute for Photonics Technology, Quanzhou Normal University, Quanzhou 362000, China.ORCID 0000-0002-0605-3248

Funding

Education and Research Foundation for Young Teachers of Education department of Fujian Province JAT241207the Natural Science Foundation of Xiamen 3502Z202573321

6 · The paper itself

Abstract

This paper proposes and experimentally demonstrates a fiber ring laser (FRL) salinity sensing system based on a Sagnac loop (SL) formed by a tapered polarization-maintaining fiber (TPMF). The operating principle is that salinity modulates the birefringence of the polarization-maintaining fiber (PMF), causing a shift in the interference wavelength of the SL transmission spectrum, while the FRL narrows the optical spectrum and enhances the signal-to-noise ratio (SNR). In the experiment, the SL consists of a 20-cm-long PMF with a tapered waist diameter of 10.86 μm. Over the salinity range of 0‱ to 30‱, the sensitivity of the laser-based sensing system is 97 pm/‱, which agrees well with the 93 pm/‱ sensitivity obtained using a broadband light source (BBS), and the salinity exhibits a good linear relationship with the wavelength shift, with a coefficient of determination (R

Indexed as

fiber ring laserSagnac loopsalinity sensingsupport vector regression

Identifiers

PMID42356926

DOI10.3390/s26123953

PMCPMC13306580

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.