Stress test and analysis based on SMS fiber structure with high sensitivity

 

ZHANG Mei-qin, WANG Guan-jun, AN Yong-quan, WANG Zhi-bin

 

 

(School of Information and Communication Engineering, North University of China, Taiyuan 030051, China)

 

Abstract： Single mode-multimode-single mode (SMS) sensor is widely used for parameters measurement, such as bending, displacement, temperature, strain, refractive index, etc. Generally, SMS sensor has advantages of simple structure, low cost and easy layout, therefore it has become a research hotspot in recent years. In this paper, the multimode fiber with large core is used for manufacturing SMS structure with high sensitivity. Firstly, the multimode fiber with core/cladding diameters of 105/125 μm has access to the system by means of single mode optical fiber. Secondly, SMS device structure is manufactured by welding the eccentric shaft of multimode optical fiber. Afterwards, mode interference effect and spectral response characteristics of the structure of single mode-multimode-single mode optical fiber are analyzed theoretically. Finally, with the help of a wide spectrum light source and a spectrum analyzer, the transmission spectra characteristics of SMS optical fiber with strain is tested. By observing the curve that the wave changes with stress, the sensitivity is calculated and it is consistent with theoretical value.

 

 

Key words： SMS optical fiber structure; optical spectrum analyzer （OSA）; amplified spontaneous emission; stress test

 

 

CLD number： TN253           Document code： A

 

Article ID： 1674-8042（2016）03-0297-05     doi： 10.3969/j.issn.1674-8042.2016.03.015

 

 

References

 

 

［1］ Mehta A, Mohammed W S, Johnson E G. Multimode interference-based fiber-optic displacement sensor. IEEE Photonics Technology Letters, 2003, 15(8)： 1124-1131.

［2］ Ribeiro R M, Werneck M M. An intrinsic graded-index multimode optical fibre strain-gauge. Sensors and Actuators A, 2004, 111(2)： 206-211.

［3］ Mohammed W S, Mehta A, Johnson E G. Wavelength tunable fibre lens based on multimode interference. Journal of Lightwave Technology, 2004, 22(2)： 469-477.

［4］ LI En-bang, WANG Xiao-lin, ZHANG Chao. Fiber-optic temperature sensor based on interference of selective higher-order modes. Applied Physics Letters, 2006, 89(9)： 091119-3.

［5］ LI En-bang. Temperature compensation of multimode interference-based fiber devices. Optics Letters, 2007, 32(14)： 2055-2065.

［6］ LI En-bang. Sensitivity-enhanced fiber-optic strain sensor based on interference of higher order modes in circular fibers. IEEE Photonics Technology Letters, 2007, 19(16)： 1262-1267.

［7］ LIU Yu, LI Wei. Low-cost high-sensitivity strain and temperature sensing using graded-index multimode fibers. Applied Optics, 2007, 46(13)： 2513-2517.

［8］ ZHANG Jian-zhong, ZHANG Yan, SUN Wei-min, et al. Multiplexing multimode fiber and Fizeau etalon： a simultaneous measurement scheme of temperature and strain. Measurement Science and Technology, 2009, 20： 065206.

［9］ ZHANG Jian-zhong, SUN Wei-min, YUAN Li-bo, et al. Design of a single-multimode-single-mode filter demodulator for fiber Bragg grating sensors assisted by mode observation. Applied Optics, 2009, 48(30)： 5642-5644.

［10］ Silva S, Frazo O, Ferreira L A, et al. Temperature-and strain-independent curvature sensor based on multimode interference. In： Proceedings of SPIE Fourth European Workshop on Optical Fibre Sensors, 2010, 7653 ： 76532A-1-4.

［11］ Frazo O, Viegas J, Caldas P, et al. All-fiber Mach-Zehnder curvature sensor based on multimode interference combined with a long-period grating. Optics Letters, 2007, 32(21)： 3071-3075.

［12］ WU Qiang, Semenova Y, Hatta AM, et al. Single-multiple-single mode fiber structures for simultaneous measurement of strain and temperature. In： Proceedings of SPIE Photonics Europe, 2010, 7726： 77261L-1-6.

［13］ Jung Y, Kim S, Lee D, et al. Compact three segmented multimode fibre modal interferometer for high sensitivity refractive-index measurement. Measurement Science Technology. 2006, 17(5)： 1129-1135.

［14］ SU Lei, Chiang K S, LU Chao. Fiber Bragg-grating incorporated microbend sensor for simultaneous mechanical parameter and temperature measurement. IEEE Photonics Technology Letters, 2005, 17(12)： 2694-2699.

［15］ Donlagic D， Culshaw B. Propagation of the fundamental mode in curved graded index multimode fiber and its application in sensor systems. Journal of Lightwave Technology. 2000, 18(3)： 334-339.

 

 

基于SMS光纤结构高灵敏度应力测试与分析

 

 

张美芹， 王冠军， 安永泉， 王志斌

 

 

(中北大学 信息与通信工程学院， 山西 太原 030051)

 

 

摘要：SMS传感器结构简单、成本低廉、易于铺设， 被广泛的应用于弯曲、 位移、 温度、 应变、 折射率等参量的测量， 近年来成为研究的热点。 本论文利用大芯径多模光纤制作SMS结构以实现高灵敏度的光纤传感结构。 首先， 将纤芯/包层直径为105/125微米的多模光纤通过单模光纤接入光纤系统， 实现SMS光纤结构， 通过对多模光纤进行偏轴熔接的手段制作SMS器件结构； 然后对单模-多模-单模光纤结构的模式干涉效应和光谱响应特性进行理论分析； 最后， 借助宽谱光源和光谱分析仪测试了单模-多模-单模光纤结构随应力变化的透射光谱特性， 通过对波峰随着应力改变而发生变化的曲线的观察， 计算出其灵敏度， 发现实验值与理论值基本吻合。

 

 

关键词：   SMS光纤结构; 光谱仪; 宽谱光； 应力测试

 

 

引用格式： ZHANG Mei-qin, WANG Guan-jun, AN Yong-quan, et al. Stress test and analysis based on SMS fiber structure with high sensitivity. Journal of Measurement Science and Instrumentation, 2016, 7(3)： 297-301. ［doi： 10.3969／j.issn.1674-8042.2016.03.015］