Multi-point dynamic strain sensing using external modulation-based Brillouin optical correlation domain analysis

Bhargav Somepalli; Deepa Venkitesh; Chao Lu; Balaji Srinivasan

doi:10.1364/OE.27.019486

Multi-point dynamic strain sensing using external modulation-based Brillouin optical correlation domain analysis

Bhargav Somepalli, Deepa Venkitesh, Chao Lu, Balaji Srinivasan

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

6 Citations (Scopus)

Abstract

We report a novel technique to detect dynamic strain variations simultaneously at multiple locations. Our technique is based on Brillouin optical correlation domain analysis implemented through external modulation to generate multiple independently-accessible correlation peaks within the sensing fiber. Experiments are carried out to demonstrate the precise determination of Brillouin frequency shift (BFS) from multiple locations independently. As a proof of principle, two correlation peaks are generated within a 1 km long fiber and their independent tunability is verified experimentally by mapping the spatial profile of the two correlations. We also experimentally demonstrate the detection of dynamic strain variations at two locations simultaneously, each with a spatial resolution of 60 cm over 100 m long fiber.

Original language	English
Pages (from-to)	19486-19502
Number of pages	17
Journal	Optics Letters
Volume	27
Issue number	14
DOIs	https://doi.org/10.1364/OE.27.019486
Publication status	Published - Jul 2019

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1364/OE.27.019486

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title = "Multi-point dynamic strain sensing using external modulation-based Brillouin optical correlation domain analysis",

abstract = "We report a novel technique to detect dynamic strain variations simultaneously at multiple locations. Our technique is based on Brillouin optical correlation domain analysis implemented through external modulation to generate multiple independently-accessible correlation peaks within the sensing fiber. Experiments are carried out to demonstrate the precise determination of Brillouin frequency shift (BFS) from multiple locations independently. As a proof of principle, two correlation peaks are generated within a 1 km long fiber and their independent tunability is verified experimentally by mapping the spatial profile of the two correlations. We also experimentally demonstrate the detection of dynamic strain variations at two locations simultaneously, each with a spatial resolution of 60 cm over 100 m long fiber.",

author = "Bhargav Somepalli and Deepa Venkitesh and Chao Lu and Balaji Srinivasan",

note = "Funding Information: Department of Electronics and Information Technology (DeitY, Govt. of India); Ministry of Human Resource Development (MHRD, Govt. of India); Department of Science and Technology (DST, Govt. of India); Office of the Principal Scientific Advisor - Govt. of India. Authors would like to thank Dr K V Reddy, PriTel Inc., USA for providing the optical amplifier and Prof Wei Jin, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong for providing the lock-in amplifier. Publisher Copyright: {\textcopyright} 2019 Optical Society of America.",

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AU - Somepalli, Bhargav

AU - Venkitesh, Deepa

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AU - Srinivasan, Balaji

N1 - Funding Information: Department of Electronics and Information Technology (DeitY, Govt. of India); Ministry of Human Resource Development (MHRD, Govt. of India); Department of Science and Technology (DST, Govt. of India); Office of the Principal Scientific Advisor - Govt. of India. Authors would like to thank Dr K V Reddy, PriTel Inc., USA for providing the optical amplifier and Prof Wei Jin, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong for providing the lock-in amplifier. Publisher Copyright: © 2019 Optical Society of America.

PY - 2019/7

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N2 - We report a novel technique to detect dynamic strain variations simultaneously at multiple locations. Our technique is based on Brillouin optical correlation domain analysis implemented through external modulation to generate multiple independently-accessible correlation peaks within the sensing fiber. Experiments are carried out to demonstrate the precise determination of Brillouin frequency shift (BFS) from multiple locations independently. As a proof of principle, two correlation peaks are generated within a 1 km long fiber and their independent tunability is verified experimentally by mapping the spatial profile of the two correlations. We also experimentally demonstrate the detection of dynamic strain variations at two locations simultaneously, each with a spatial resolution of 60 cm over 100 m long fiber.

AB - We report a novel technique to detect dynamic strain variations simultaneously at multiple locations. Our technique is based on Brillouin optical correlation domain analysis implemented through external modulation to generate multiple independently-accessible correlation peaks within the sensing fiber. Experiments are carried out to demonstrate the precise determination of Brillouin frequency shift (BFS) from multiple locations independently. As a proof of principle, two correlation peaks are generated within a 1 km long fiber and their independent tunability is verified experimentally by mapping the spatial profile of the two correlations. We also experimentally demonstrate the detection of dynamic strain variations at two locations simultaneously, each with a spatial resolution of 60 cm over 100 m long fiber.

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Multi-point dynamic strain sensing using external modulation-based Brillouin optical correlation domain analysis

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