Crack monitoring on concrete structures: Comparison of various distributed fiber optic sensors with digital image correlation method

Research output: Contribution to journalResearch articleContributedpeer-review


The quality of strain measurements using distributed fiber optic sensors (DFOS) depends largely on the bond between the host material and the optical fiber. Experimental investigations were carried out to test the suitability of five different DFOS types for crack monitoring. The DFOS were subsequently bonded to two 4 m long reinforced concrete (RC) beams, so that the influence of the application technique could be evaluated. DFOS measurements were verified by digital image correlation (DIC) and electrical strain gauges (SGs). For the different DFOS types, clear differences in the measured strain curves and determined crack widths were observed. The focus was on two robust DFOS, which can be deployed on construction sites. Compared to the layered sensing cable, a monolithic DFOS showed a clear strain distribution with pronounced strain peaks even for closely spaced cracks. The crack widths obtained by integrating the strain curves showed high agreement with DIC measurements.


Original languageEnglish
Pages (from-to)6123-6140
Number of pages18
JournalStructural Concrete
Issue number5
Publication statusPublished - 14 Jun 2023

External IDs

Scopus 85161893629
WOS 001010419500001
ORCID /0000-0002-2187-1652/work/142241781
ORCID /0000-0001-8735-1345/work/142244648
ORCID /0000-0002-7298-2395/work/142251897


Research priority areas of TU Dresden

Subject groups, research areas, subject areas according to Destatis


  • crack monitoring, crack width calculation, DFOS, DFOS type, distributed fiber optic sensing, existing concrete bridges, installation technique, Existing concrete bridges, Dfos, Distributed fiber optic sensing, Crack width calculation, Installation technique, Crack monitoring