Strain Monitoring During Construction of a Steel Box-Girder Bridge with Arrays of FIber Bragg Grating Sensors

摘要

Field performance of arrays of wavelength division multiplexed (WDM) fiber Bragg grating strain sensors is presented. Data from two field tests, carried out in February 1998 and October 1998 on an in-construction box-girder bridge, are presented and compared to data obtained from arrays of conventional sensors, where possible. The results in this report represent one of the first extensive tests of WDM Bragg grating sensor arrays on real world infrastructure. The results show that most of the well known advantages of fiber optic sensors, for example smaller array size, electromagnetic immunity, versatile data sets, easy installation, built-in telemetry and high sensitivity can be realized in real world environments.