Journal
SENSORS
Volume 17, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/s17071654
Keywords
FBG sensor; prestressed concrete; strand; strain; structural health monitoring
Funding
- Technology Advancement Research Program - Ministry of Land, Infrastructure and Transport of Korean government [14CTAP-C078424-01]
- Korea Agency for Infrastructure Technology Advancement (KAIA) [78424] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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FBG sensors offer many advantages, such as a lack of sensitivity to electromagnetic waves, small size, high durability, and high sensitivity. However, their maximum strain measurement range is lower than the yield strain range (about 1.0%) of steel strands when embedded in steel strands. This study proposes a new FBG sensing technique in which an FBG sensor is recoated with polyimide and protected by a polyimide tube in an effort to enhance the maximum strain measurement range of FBG sensors embedded in strands. The validation test results showed that the proposed FBG sensing technique has a maximum strain measurement range of 1.73% on average, which is 1.73 times higher than the yield strain of the strands. It was confirmed that recoating the FBG sensor with polyimide and protecting the FBG sensor using a polyimide tube could effectively enhance the maximum strain measurement range of FBG sensors embedded in strands.
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