Temperature Sensor Based on Fiber Ring Laser With Cascaded Fiber Optic Sagnac Interferometers

被引：36

作者：

Lin, Weihao ^{[1
,2
]}

Shao, Liyang ^{[1
]}

Liu, Yibin ^{[1
]}

Bandyopadhyay, Sankhyabrata ^{[1
]}

Liu, Yuhui ^{[1
]}

Xu, Weijie ^{[1
]}

Liu, Shuaiqi ^{[1
,2
]}

Hu, Jie ^{[1
]}

Vai, Mang, I ^{[2
]}

机构：

[1] Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

[2] Univ Macau, Fac Sci & Technol, Dept Elect & Comp Engn, Macau 999078, Peoples R China

来源：

IEEE PHOTONICS JOURNAL | 2021年 / 13卷 / 02期

关键词：

Sagnac interferometers; Temperature sensors; Optical fiber sensors; Temperature measurement; Sensitivity; Optical fiber polarization; Optical interferometry; Fiber ring laser; cascaded Sagnac loop; temperature sensors; FABRY-PEROT-INTERFEROMETER; REFRACTIVE-INDEX; STRESS; STRAIN;

D O I：

10.1109/JPHOT.2021.3065567

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A new temperature fiber ring laser (FRL) sensor based on a cascaded Sagnac loops fiber structure is proposed and experimentally demonstrated. The optical FRL sensor consists of cascaded Sagnac loops by inserting two polarization-maintaining optical fibers (PMF) with slightly different lengths. PMF with length of 56 cm and 75 cm are used in Sagnac loops as a filter and sensing unit in laser cavity. The working principle of the sensor is based on the phase shift (theta) caused by birefringence between two principal polarization modes and enhance the sensitivity by constructing a Vernier-scale. In an appropriate temperature range (25 degrees C - 31 degrees C), the detection sensitivity of FRL sensor based on a cascaded Sagnac structure is significantly higher than other FRL sensors. Thanks to the laser sensing system, the sensitivity can be modulated by changing the free spectral range (FSR). The experimental results show that the temperature sensitivity of the cascade Sagnac structure sensor is - 4.031 nm / degrees C, which is five times higher than that of FRL sensor base on the single Sagnac structure.

引用

页数：13

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