The strain measurement of a 1.65-m reinforced concrete beam by use of a distributed fiber strain sensor with a 50-cm spatial resolution and 5-cm readout resolution is reported. The strain-measurement accuracy is ±15 µε (µm/m) according to the system calibration in the laboratory environment with non-uniform-distributed strain and ±5 µε with uniform strain distribution. The strain distribution has been measured for one-point and two-point loading patterns for optical fibers embedded in pultruded glass fiber reinforced polymer (GFRP) rods and those bonded to steel reinforcing bars. In the one-point loading case, the strain deviations are ±7 and ±15 µε for fibers embedded in the GFRP rods and fibers bonded to steel reinforcing bars, respectively, whereas the strain deviation is ±20 µε for the two-point loading case.
© 2002 Optical Society of America
Original Manuscript: August 27, 2001
Revised Manuscript: March 20, 2002
Published: August 20, 2002
Xiaodong Zeng, Xiaoyi Bao, Chia Yee Chhoa, Theodore W. Bremner, Anthony W. Brown, Michael D. DeMerchant, Graham Ferrier, Alexander L. Kalamkarov, and Anastasis V. Georgiades, "Strain measurement in a concrete beam by use of the Brillouin-scattering-based distributed fiber sensor with single-mode fibers embedded in glass fiber reinforced polymer rods and bonded to steel reinforcing bars," Appl. Opt. 41, 5105-5114 (2002)