Multi-point dynamic strain sensing using external modulation-based Brillouin optical correlation domain analysis
Year: 2019
Type: article
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.
Source: Optics Express
DOI: 10.1364/oe.27.019486
Authors: Bhargav Somepalli, Deepa Venkitesh, Chao Lu, Balaji Srinivasan
Language: English
Topic: Advanced Fiber Optic Sensors
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Funders: Department of Science and Technology, Ministry of Science and Technology, India, Department of Electronics and Information Technology, Ministry of Communications and Information Technology, Hong Kong Polytechnic University, Ministry of Education, India, Division of Human Resource Development
OpenAlex ID: W2963921695