Distributed Fiber Optic Shape Sensing of Concrete Structures

Civil structural health monitoring (CSHM) has become significantly more important within the last decades due to rapidly growing construction volume worldwide as well as aging infrastructure and longer service lifetimes of the structures. The utilization of distributed fiber optic sensing (DFOS) all...

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Bibliographic Details
Published inSensors (Basel, Switzerland) Vol. 21; no. 18; p. 6098
Main Authors Monsberger, Christoph M., Lienhart, Werner
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 11.09.2021
MDPI
Subjects
beam load testing
Bragg gratings
Cables
Civil engineering
civil structural health monitoring
Concrete
Concrete structures
Construction
Continuous fiber composites
Design
distributed fiber optic sensors
Fiber optics
Flaw detection
Infrastructure
Laboratories
Load tests
Localization
Sensors
Service life
shape sensing
Structural health monitoring
Temperature effects
Tunnel construction
tunnel lining segments
Tunnel linings
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Summary:Civil structural health monitoring (CSHM) has become significantly more important within the last decades due to rapidly growing construction volume worldwide as well as aging infrastructure and longer service lifetimes of the structures. The utilization of distributed fiber optic sensing (DFOS) allows the assessment of strain and temperature distributions continuously along the installed sensing fiber and is widely used for testing of concrete structures to detect and quantify local deficiencies like cracks. Relations to the curvature and bending behavior are however mostly excluded. This paper presents a comprehensive study of different approaches for distributed fiber optic shape sensing of concrete structures. Different DFOS sensors and installation techniques were tested within load tests of concrete beams as well as real-scale tunnel lining segments, where the installations were interrogated using fully-distributed sensing units as well as by fiber Bragg grating interrogators. The results point out significant deviations between the capabilities of the different sensing systems, but demonstrate that DFOS can enable highly reliable shape sensing of concrete structures, if the system is appropriately designed depending on the CSHM application.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s21186098