Simplified configuration of Brillouin optical correlation-domain reflectometry

TL;DR

This paper introduces a simplified, cost-effective BOCDR setup that omits the traditional reference path, using Fresnel reflection instead, and demonstrates high-resolution distributed strain measurement over a 4.1-meter range.

Contribution

A novel BOCDR configuration that eliminates the need for an additional reference path, simplifying the system and reducing costs.

Findings

Achieved < 100-mm spatial resolution in strain measurement

Demonstrated a 4.1-m measurement range

Maintained high signal-to-noise ratio

Abstract

We develop a simple and cost-efficient configuration of Brillouin optical correlation-domain reflectometry (BOCDR), the setup of which does not include an additional reference path used in standard BOCDR systems. The Fresnel-reflected light from an open end of a sensing fiber is used as reference light. The limitations of spatial resolution, measurement range, and their ratio are theoretically clarified, and then a distributed strain measurement with a < 100-mm spatial resolution and a 4.1-m measurement range is demonstrated with a high signal-to-noise ratio.