Optical fiber Michelson interference sensor for measuring refractive index

被引：0
|
作者：
Zheng C. [1 ]
Feng W. [1 ,2 ]
He S. [1 ]
Li B. [2 ]
机构：
[1] College of Science, Chongqing University of Technology, Chongqing
[2] Chongqing Key Laboratory of Green Energy Materials Technology and Systems, Chongqing
来源：
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2022年 / 51卷 / 05期
关键词：
Fiber-optic sensor; Four-core fiber; Michelson interference; Refractive index sensor; Thin-core fiber;
D O I：
10.3788/IRLA20210327
中图分类号：
学科分类号：
摘要：
A refractive index sensor based on single-mode fiber (SMF) four-core fiber (FCF) and thin-core fiber (TCF) is proposed, forming a SMF-FCF-TCF Michelson interference structure. The optical fibers are spliced by direct splicing. Because of the mismatch of the diameter of the optical fibers' cores, light excitation and coupling will be induced at the splicing part. The end face of the TCF is coated with a layer of silver film and protected with ultraviolet curing glue to enhance the reflectivity of the light at the end face. The four-core fiber is used as a coupler in the sensing structure, which excites more light into the cladding of the TCF, improving the sensitivity of the sensor. The refractive index and temperature sensing characteristics of the sensor were investigated experimentally. The experimental results show that the sensitivity in the refractive index range of 1.3333 to 1.3794 is 137.317 nm/RIU, the linearity is 0.999, and the temperature has little effect on the sensor. The sensing structure has a simple welding method and has certain application prospects in the field of refractive index measurement. Copyright ©2022 Infrared and Laser Engineering. All rights reserved.
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