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Proceedings Paper

Femtosecond laser fabricated multimode fiber sensors interrogated by optical-carrier-based microwave interferometry technique for distributed strain sensing
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Paper Abstract

A multimode fiber (MMF) based cascaded intrinsic Fabry-Perot interferometers (IFPIs) system is presented and the distributed strain sensing has been experimentally demonstrated by using such system. The proposed 13 cascaded IFPIs have been formed by 14 cascaded reflectors that have been fabricated on a grade index MMF. Each reflector has been made by drawing a line on the center of the cross-section of the MMF through a femtosecond laser. The distance between any two adjacent reflectors is around 100 cm. The optical carrier based microwave interferometry (OCMI) technique has been used to interrogate the MMF based cascaded FPIs system by reading the optical interference information in the microwave domain. The location along with the shift of the interference fringe pattern for each FPI can be resolved though signal processing based on the microwave domain information. The multimode interference showed very little influence to the microwave domain signals. By using such system the strain of 10-4 for each FPI sensor and the spatial resolution of less than 5 cm for the system can be easily achieved.

Paper Details

Date Published: 16 March 2016
PDF: 6 pages
Proc. SPIE 9754, Photonic Instrumentation Engineering III, 97540V (16 March 2016); doi: 10.1117/12.2208912
Show Author Affiliations
Liwei Hua, Clemson Univ. (United States)
Yang Song, Clemson Univ. (United States)
Jie Huang, Missouri Univ. of Science and Technology (United States)
Baokai Cheng, Clemson Univ. (United States)
Wenge Zhu, Clemson Univ. (United States)
Hai Xiao, Clemson Univ. (United States)


Published in SPIE Proceedings Vol. 9754:
Photonic Instrumentation Engineering III
Yakov G. Soskind; Craig Olson, Editor(s)

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