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Proceedings Paper

Fabrication and sensing properties of fiber Mach-Zehnder sensor based on CO2 laser fusion
Author(s): Yao Wang; Mei Sang; Shuang Wang; Jie Dong; Tiegen Liu
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Paper Abstract

We demonstrate a method for fabricating a fiber sensor which is based on the Mach-Zehnder interference principle and used to the curvature sensing. By using of the CO2 laser fusion, a standard single-mode fiber surface forms a collapse, which is asymmetrical in the normal direction. When the core mode of the transmitted light enters the fusion region, a portion of the light will enter the cladding of the fiber and transport as cladding modes. The cladding modes are sensitive to the external environment and the deformations of the structure. When the cladding modes leave the fusion region, they are re-coupled into the core. Mach-Zehnder interference occurs between the cladding modes and the core mode. The transmission spectrum of the sensor at 1460 nm changes with the curvature. The average sensitivities of the sensor to curvature sensing on the two directions are up to 4.941nm/m-1 and -1.933nm/m-1. This characteristic of the sensor could be used to sense the degree and direction of the curvature of constructions. The curvature sensor we proposed is simple, reproducible and low-cost. It offers a promising applications in construction health monitoring.

Paper Details

Date Published: 12 March 2020
PDF: 12 pages
Proc. SPIE 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 114360E (12 March 2020); doi: 10.1117/12.2543643
Show Author Affiliations
Yao Wang, Tianjin Univ. (China)
Mei Sang, Tianjin Univ. (China)
Shuang Wang, Tianjin Univ. (China)
Jie Dong, Tianjin Univ. (China)
Tiegen Liu, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 11436:
2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications
Xuping Zhang; Hai Xiao, Editor(s)

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