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

Liwei Hua; Yang Song; Jie Huang; Baokai Cheng; Wenge Zhu; Hai Xiao

doi:10.1117/12.2208912

16 March 2016 Femtosecond laser fabricated multimode fiber sensors interrogated by optical-carrier-based microwave interferometry technique for distributed strain sensing

Liwei Hua, Yang Song, Jie Huang, Baokai Cheng, Wenge Zhu, Hai Xiao

Author Affiliations +

Proceedings Volume 9754, Photonic Instrumentation Engineering III; 97540V (2016) https://doi.org/10.1117/12.2208912
Event: SPIE OPTO, 2016, San Francisco, California, United States

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.

Citation Download Citation

Liwei Hua, Yang Song, Jie Huang, Baokai Cheng, Wenge Zhu, and Hai Xiao "Femtosecond laser fabricated multimode fiber sensors interrogated by optical-carrier-based microwave interferometry technique for distributed strain sensing", Proc. SPIE 9754, Photonic Instrumentation Engineering III, 97540V (16 March 2016); https://doi.org/10.1117/12.2208912

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