Comparative Assessment and Experimental Validation of a Prototype Phase-Optical Time-Domain Reflectometer for Distributed Structural Health Monitoring

Figure 10

(a) Time response of the 14 FBGs during test 2 (low intensity, single harmonic excitation at 7.4 Hz); blue colour denotes FBGs on the north side of the bridge and red FBGs on the south side. (b) Time response of the Phase-OTDR (PO) system at the locations of the 14 FBGs; in blue are the signals from the north side of the bridge and in red are the signals from the south side.

(a)

(b)