Temperature-insensitive vector bending sensor based on parallel-integrated fiber Bragg gratings

被引：0
|
作者：
Shao L. [1 ,2 ]
Bao W. [1 ,2 ]
Liu S. [1 ,2 ]
Du B. [1 ,2 ]
Yang K. [1 ,2 ]
Fu C. [1 ,2 ]
Liu X. [1 ,2 ]
Li Z. [1 ,2 ]
Wang Y. [1 ,2 ]
机构：
[1] Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen
[2] Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen
来源：
Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2021年 / 51卷 / 02期
关键词：
Bending sensors; Femtosecond lasers; Fiber Bragg gratings; Optics fiber sensors; Vector sensors;
D O I：
10.1360/SST-2020-0276
中图分类号：
学科分类号：
摘要：
Parallel-integrated fiber Bragg grating (PI-FBG) arrays use a femtosecond laser line-by-line method. Each FBG in the fiber grating array is fabricated at the same position along the axial direction of a multimode fiber core but at different radial directions. The PI-FBG array can be used to realize a temperature-insensitive vector bending sensor. Such a sensor can not only measure bending curvature but also determine any bending direction. By introducing the demodulation method of equivalent fiber grating, that is, the difference operation of the FBG reflection wavelength changes, the cross-sensitivity problem between the bending and the temperature is overcome, and the bending sensitivity of the sensor is almost doubled; thus, the resolution of the bending sensor is remarkably improved. Therefore, the vector bending sensor can achieve the real-time monitoring of the bending curvature and bending direction of an intelligent engineering structure. © 2021, Science Press. All right reserved.
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页码：241 / 248
页数：7
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