Enlargement of Dynamic Strain Range in Chaotic Brillouin Optical Correlation Domain Analysis by Cross-Arranged Multislope Assistance

We propose and experimentally demonstrate a cross-arranged multislope-assisted chaotic Brillouin optical correlation domain analysis (MSA-CBOCDA) to achieve a large-range dynamic strain measurement. Based on the broadband chaotic Brillouin gain spectrum (BGS), the cross-arranged MSA model is first constructed, whose high measurement accuracy and slope utilization rate (SUR) are further verified in simulation. The dynamic strain with a range of
$4780~\mu \varepsilon $
is finally realized in the experiment, where the standard deviation is around
$23.8~\mu \varepsilon $
. The range of dynamic strain is enlarged fourfold than the previous slope-assisted (SA) CBOCDA with a virtually identical accuracy.