High-Spatial-Resolution Dynamic Strain Measurement Based on Brillouin Optical Correlation-Domain Sensors

Abstract

Brillouin-scattering-based sensors have been widely applied in distributed temperature or strain measurement in recent 20 years. Brillouin optical correlation-domain technology has extensive development and application prospects because of its millimeter-level spatial resolution, distribution measurement, and high accuracy. Traditional Brillouin-scattering-based sensors, requiring a time-consuming frequency-sweep process, struggle to achieve dynamic strain measurement. In this article, Brillouin optical correlation-domain analysis and reflectometry based on fast-sweep frequency and slope-assisted methods will be reviewed. The main merits, drawbacks, and performances of these schemes are compared, and the avenues for future research and development of these two technologies are also explored.

Strain Measurement Technology and Precision Calibration Experiment Based on Flexible Sensing Fiber

“…Using conventional single-mode optical fiber as sensor, it is easy to realize large-scale deployment and realize point-to-point high-precision and high-resolution distributed sensing, which is often used in the fields of structural health detection, nondestructive testing of composite materials, battery temperature testing and so on in civil engineering. With the advantages of OFDR technology, it provides a new idea for the design of various sensing test schemes [ 11 , 12 ]. At present, with the development of FBG and OFDR, FBG and OFDR have been widely used in the measurement of temperature, strain, stress and other physical parameters [ 13 , 14 , 15 ].…”