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

Bhargav Somepalli, Deepa Venkitesh, Chao Lu, Balaji Srinivasan

Research output: Journal article publicationJournal articleAcademic researchpeer-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 languageEnglish
Pages (from-to)19486-19502
Number of pages17
JournalOptics Letters
Volume27
Issue number14
DOIs
Publication statusPublished - Jul 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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