Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber
We utilized a CO<sub>2</sub> laser to carve long-period fiber gratings (LPFGs) on polarization-maintaining fibers (PMFs) along the fast and slow axes. Based on the spectra of LPFGs written along two different directions, we found that when LPFG was written along the fast axis, the spectr...
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| Format: | Article |
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MDPI AG
2024-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/24/2/377 |
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| author | Qiufang Zhang Yiwen Zheng Yixin Zhu Qianhao Tang Yongqin Yu Lihu Wang |
| author_facet | Qiufang Zhang Yiwen Zheng Yixin Zhu Qianhao Tang Yongqin Yu Lihu Wang |
| author_sort | Qiufang Zhang |
| collection | DOAJ |
| description | We utilized a CO<sub>2</sub> laser to carve long-period fiber gratings (LPFGs) on polarization-maintaining fibers (PMFs) along the fast and slow axes. Based on the spectra of LPFGs written along two different directions, we found that when LPFG was written along the fast axis, the spectrum had lower insertion loss and fewer side lobes. We investigated the temperature and twist characteristics of the embedded structure of the LPFG and Sagnac loop and ultimately obtained a temperature sensitivity of −0.295 nm/°C and a twist sensitivity of 0.87 nm/(rad/m) for the LPFG. Compared to the single LPFG, the embedded structure of the LPFG and Sagnac loop demonstrates a significant improvement in temperature and twist sensitivities. Additionally, it also possesses the capability to discern the direction of the twist. The embedded structure displays numerous advantages, including easy fabrication, low cost, good robustness, a wide range, and high sensitivity. These features make it highly suitable for applications in structural health monitoring and other related fields. |
| first_indexed | 2024-03-08T09:47:39Z |
| format | Article |
| id | doaj.art-3e6214bbd9fd4a8fbc221325cc79c1ff |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-08T09:47:39Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-3e6214bbd9fd4a8fbc221325cc79c1ff2024-01-29T14:13:54ZengMDPI AGSensors1424-82202024-01-0124237710.3390/s24020377Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining FiberQiufang Zhang0Yiwen Zheng1Yixin Zhu2Qianhao Tang3Yongqin Yu4Lihu Wang5College of Physical Science and Technology, Guangxi Normal University, Guilin 541004, ChinaKey Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Sino-German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, ChinaKey Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Sino-German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, ChinaKey Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Sino-German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, ChinaKey Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Sino-German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, ChinaCollege of Physical Science and Technology, Guangxi Normal University, Guilin 541004, ChinaWe utilized a CO<sub>2</sub> laser to carve long-period fiber gratings (LPFGs) on polarization-maintaining fibers (PMFs) along the fast and slow axes. Based on the spectra of LPFGs written along two different directions, we found that when LPFG was written along the fast axis, the spectrum had lower insertion loss and fewer side lobes. We investigated the temperature and twist characteristics of the embedded structure of the LPFG and Sagnac loop and ultimately obtained a temperature sensitivity of −0.295 nm/°C and a twist sensitivity of 0.87 nm/(rad/m) for the LPFG. Compared to the single LPFG, the embedded structure of the LPFG and Sagnac loop demonstrates a significant improvement in temperature and twist sensitivities. Additionally, it also possesses the capability to discern the direction of the twist. The embedded structure displays numerous advantages, including easy fabrication, low cost, good robustness, a wide range, and high sensitivity. These features make it highly suitable for applications in structural health monitoring and other related fields.https://www.mdpi.com/1424-8220/24/2/377long period fiber gratingpolarization-maintaining fiberSagnac interferometertemperature and twist sensor |
| spellingShingle | Qiufang Zhang Yiwen Zheng Yixin Zhu Qianhao Tang Yongqin Yu Lihu Wang Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber Sensors long period fiber grating polarization-maintaining fiber Sagnac interferometer temperature and twist sensor |
| title | Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber |
| title_full | Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber |
| title_fullStr | Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber |
| title_full_unstemmed | Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber |
| title_short | Temperature and Twist Sensor Based on the Sagnac Interferometer with Long-Period Grating in Polarization-Maintaining Fiber |
| title_sort | temperature and twist sensor based on the sagnac interferometer with long period grating in polarization maintaining fiber |
| topic | long period fiber grating polarization-maintaining fiber Sagnac interferometer temperature and twist sensor |
| url | https://www.mdpi.com/1424-8220/24/2/377 |
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