Real-Time Distributed Strain Monitoring of a Railway Bridge during Train Passage by Using a Distributed Optical Fiber Sensor Based on Brillouin Optical Correlation Domain Analysis

Figure 13

Brillouin frequency and strain distribution on the rail in the longitudinal direction of the bridge by using the distributed optical fiber sensor: (a) changes in the Brillouin frequency of the optical fiber attached to the rail before and during the train passage and (b) longitudinal strain distribution of the rail based on the bridge position during train passage.

(a)

(b)