Modal Analysis on Macro-strain Measurements from Distributed Long-gage Fiber Optic Sensors

Fiber optic sensors cannot measure damage; for getting information about damage from strain measurements, additional strategies are needed, and several alternatives have been proposed. This paper discuss two independent concepts: the first one is based on detecting the new strains appearing around a damage spot; the structure does not need to be under loads; the technique is very robust, damage detectability is high, but it requires sensors to be located very close to the damage, so it is a local technique. The second approach offers a wider coverage of the structure, it is based on identifying the changes caused by the damage on the strains field in the whole structure for similar external loads. Damage location does not need to be known a priori, detectability is dependent upon the sensors network density, damage size and the external loads. Examples of application to real structures are given.

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Modal analysis using fiber optic sensors and neural networks for prediction of composite beam delamination

Smart Materials and Structures ◽

10.1088/0964-1726/11/4/302 ◽

2002 ◽

Vol 11 (4) ◽

pp. 489-495 ◽

Cited By ~ 45

Author(s):

Steve E Watkins ◽

Gilbert W Sanders ◽

Farhad Akhavan ◽

K Chandrashekhara

Keyword(s):

Neural Networks ◽

Modal Analysis ◽

Composite Beam ◽

Fiber Optic ◽

Fiber Optic Sensors

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Dynamic strain measurements by use of the polarimetric fiber optic sensors

Proceedings of 1995 IEEE Instrumentation and Measurement Technology Conference - IMTC 95 IMTC-95 ◽

10.1109/imtc.1995.515428 ◽

2002 ◽

Cited By ~ 2

Author(s):

A.W. Domanski ◽

A. Gorecki ◽

M. Swillo

Keyword(s):

Fiber Optic ◽

Fiber Optic Sensors ◽

Dynamic Strain ◽

Strain Measurements

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Distributed Optical Fiber-Based Approach for Soil–Structure Interaction

Sensors ◽

10.3390/s20010321 ◽

2020 ◽

Vol 20 (1) ◽

pp. 321 ◽

Cited By ~ 4

Author(s):

Nissrine Boujia ◽

Franziska Schmidt ◽

Christophe Chevalier ◽

Dominique Siegert ◽

Damien Pham Van Bang

Keyword(s):

Fiber Optic ◽

Fiber Optic Sensors ◽

Lateral Loads ◽

Dynamic Tests ◽

Strain Measurements ◽

Winkler Model ◽

Optical Frequency Domain Reflectometry ◽

Frequency Domain Reflectometry ◽

The Stability ◽

Distributed Optical Fiber

Scour is a hydraulic risk threatening the stability of bridges in fluvial and coastal areas. Therefore, developing permanent and real-time monitoring techniques is crucial. Recent advances in strain measurements using fiber optic sensors allow new opportunities for scour monitoring. In this study, the innovative optical frequency domain reflectometry (OFDR) was used to evaluate the effect of scour by performing distributed strain measurements along a rod under static lateral loads. An analytical analysis based on the Winkler model of the soil was carefully established and used to evaluate the accuracy of the fiber optic sensors and helped interpret the measurements results. Dynamic tests were also performed and results from static and dynamic tests were compared using an equivalent cantilever model.

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