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FOBG - Design and validation of FOBG for SHM application

European Union
Geo-spatial type
Total project cost
€78 000
EU Contribution
€58 500
Project Acronym
STRIA Roadmaps
Vehicle design and manufacturing (VDM)
Transport mode
Airborne icon
Transport policies
Transport sectors
Passenger transport,
Freight transport


Call for proposal
Link to CORDIS

Fibre Bragg grating sensors (FBG) for structural health monitoring has gained increasing importance in aerospace applications, since it enables large-scale measurement of most relevant structural parameters while mitigating well-known technical constrains of conventional sensors.

The main drawback of a fibre Bragg grating strain sensor is its thermal cross-sensitivity. Currently such a single parameter measurement is difficult to implement, since cross-sensitivity to temperature compels the use of an additional temperature reference.

In this project a passive athermal FBG strain gage that renders optional the measurement of temperature was proposed. Such a design benefits large scale system design and performance. The innovative design ensured a thermal operation of the strain gage by cancelling the intrinsic fibre optic thermal sensitivity. Moreover, the passive athermal design may be adjusted to further compensate for structural thermal expansion, thus enabling stress and load-induced strain-components to be measured.

Special care was taken on the design of the sensor enclosure to enable multiplexing of several sensors over a single optical fibre and ease installation procedures in aerospace applications. Qualified space fibre optic cables for sensing network deployment were employed.

Commercially available industrial interrogation unit equipment was taken as a base to evaluate the optoelectronic hardware adaptation that would be required in order to fulfil aerospace specifications. The design requirements were assessed in terms of mechanical (mass, volume, vibration and shock), thermal (heat dissipation and operation temperature range) and electrical parameters (power consumption and communication interface).

Embedded software allowed for data conversion from wavelength measurements to engineering parameters (strain, temperature, load) that afterwards was processed considering SHM requirements to provide automatic alarm generation.


Parent Programmes
Institution Type
Public institution
Institution Name
European Commission
Type of funding
Public (EU)
Specific funding programme
JTI-CS - Joint Technology Initiatives - Clean Sky
Other Programme
JTI-CS-2009-1-GRA-01-011 FOBG - Design and validation of FOBG for SHM application


Lead Organisation
Fibersensing-Sistemas Avancados Demonitorizacao Sa
Campus da FEUP, Rua Dr Roberto Frias, 378, 4470 640 PORTO, Portugal
Organisation website
EU Contribution
€58 500
Partner Organisations
EU Contribution


Technology Theme
Condition monitoring
Structural health monitoring based on modelling
Development phase

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