Abstract

High-throughput fully distributed fiber Bragg grating (FBG) sensors based on optical time-stretch frequency-domain reflectometry (OTS-FDR) [1] has proved to be a promising tool for high temporal and spatial resolution distributed strain sensing. The dynamic distributed strain information along the FBG sensor can be reconstructed from the instantaneous RF frequency of the captured temporal interference waveform. An unprecedented measurement speed of 50 MHz with high spatial resolution of 31.5 μm and strain resolution of 9.1 με have been demonstrated per 25 mm gauge length. This approach has been successfully applied to high-speed strain and pressure sensing in dynamic extremes of magnetic materials [2].

© 2017 IEEE