High-Sensitivity LPFG Torsion Sensor Based on Indirect Torsion Slot

被引：0

作者：

Kang, Jianyang ^{[1
]}

Dang, Suihu ^{[2
]}

Wang, Xingkai ^{[3
]}

Ye, Kun ^{[1
]}

Bai, Yunfeng ^{[2
]}

Wang, Yuanchong ^{[2
]}

Xia, Liangping ^{[2
]}

Du, Chunlei ^{[2
]}

机构：

[1] Chongqing Three Gorges Univ, Coll Elect & Informat Engn, Chongqing 404100, Peoples R China

[2] Yangtze Normal Univ, Sch Elect Informat & Engn, Key Lab Micro Nano Optoelect Devices & Intelligent, Chongqing 408100, Peoples R China

[3] Harbin Engn Univ, Key Lab In Fiber Integrated Opt, Minist Educ China, Harbin 150001, Peoples R China

来源：

IEEE SENSORS JOURNAL | 2025年 / 25卷 / 01期

关键词：

Sensors; Optical fiber sensors; Force; Sensitivity; Optical fibers; Wavelength measurement; Resonance; Temperature sensors; Optical fiber polarization; Claddings; Elliptic birefringence; long-period fiber grating (LPFG); torsion measurement; torsion sensor; LONG; BIREFRINGENCE;

D O I：

10.1109/JSEN.2024.3492395

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：

Long-period fiber gratings (LPFGs) torsion sensors are used for engineering measurements and real-time monitoring of torsion in smart structures. In this article, an indirect torsion slot-based sensor is proposed. The sensor uses a CO2 laser to etch notches on the surface of the fiber, which indirectly introduces a residual twisting force to increase the refractive index difference between the two notch modulations, creating a structure in which the notches are distributed in two rows on the fiber surface. The structure breaks the circular symmetry of the fiber and introduces residual twisting force, which introduces elliptical birefringence in a large amount, and the effect of applying different twisting angles during fabrication on the sensitivity is investigated, which effectively improves the torsional sensitivity. The experimental results show that the sensor torsional sensitivity is up to 1.288 nm/(rad/m) in the measurement range from -6.54 to 6.54 rad/m. The temperature characteristics of the sensor were also investigated, with a temperature sensitivity of 92 pm/degrees C over the detection range from 30(degrees)C to 120(degrees)C. In addition, the sensor has the advantage of low preparation cost and simple process, which has applications scenario in engineering, where high torsional sensitivity is required.

引用

页码：398 / 404

页数：7