Fiber grating sensors for structural health monitoring of aerospace structures

Udd, Eric

doi:10.1117/12.659048

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…[1][2][3][4] Some of the key parameters to be monitored for SHM are temperature, humidity, acidity, salinity, UV radiation, carbonization, deformation, strain, fatigue damage, and corrosion. Therefore, SHM systems can consist of a wide number of sensors and transmission systems for an adequate data management and health diagnosis.…”

Section: Introductionmentioning

confidence: 99%

Optical Sensors for Corrosion Monitoring

Zamarreño

Rivero

Hernáez

et al. 2015

Intelligent Coatings for Corrosion Control

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Section: Introductionmentioning

confidence: 99%

Optical Sensors for Corrosion Monitoring

Zamarreño

Rivero

Hernáez

et al. 2015

Intelligent Coatings for Corrosion Control

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“…They are lightweight, small in size and electromagnetically immune. Several studies have shown the potential of FOS in space [1][2][3][4][5]. Their small size and multiplexing capability makes them very suitable for structural integration.…”

Section: Introductionmentioning

confidence: 99%

Integrated fiber optic sensors for hot spot detection and temperature field reconstruction in satellites

Rapp

Baier

2010

Smart Mater. Struct.

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Large satellites are often equipped with more than 1000 temperature sensors during the test campaign. Hundreds of them are still used for monitoring during launch and operation in space. This means an additional mass and especially high effort in assembly, integration and verification on a system level. So the use of fiber Bragg grating temperature sensors is investigated as they offer several advantages. They are lightweight, small in size and electromagnetically immune, which fits well in space applications. Their multiplexing capability offers the possibility to build extensive sensor networks including dozens of sensors of different types, such as strain sensors, accelerometers and temperature sensors. The latter allow the detection of hot spots and the reconstruction of temperature fields via proper algorithms, which is shown in this paper. A temperature sensor transducer was developed, which can be integrated into satellite sandwich panels with negligible mechanical influence. Mechanical and thermal vacuum tests were performed to verify the space compatibility of the developed sensor system. Proper reconstruction algorithms were developed to estimate the temperature field and detect thermal hot spots on the panel surface. A representative hardware demonstrator has been built and tested, which shows the capability of using an integrated fiber Bragg grating temperature sensor network for temperature field reconstruction and hot spot detection in satellite structures.

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“…With the recent application of inverse scattering methods, such as the Born approximation method [1], a layer-peeling algorithm (LPA) [2] or a genetic algorithm [3], the refractive * This paper is the work of an agency of the US government and is not subject to copyright. index changes due to environmental strain and temperature influences are detectable on scales smaller than the FBG length.…”

Section: Introductionmentioning

confidence: 99%

“…index changes due to environmental strain and temperature influences are detectable on scales smaller than the FBG length. This has been applied to measuring nonuniform strain fields as well as highly localized strains by direct measurement of the stress-optic or thermal-optic induced changes in the refractive index [3][4][5][6][7][8][9][10][11][12]. These methods have been shown to provide spatial resolutions near 10 µm, limited by the source bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Practical spatial resolution limits of high-resolution fibre Bragg grating sensors using layer peeling

Espejo¹,

Dyer²

2007

Meas. Sci. Technol.

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Inverse scattering methods such as layer peeling have been shown to reconstruct the longitudinal refractive index of fibre Bragg gratings with very high spatial resolution. These high spatial resolution measurements can be used to detect strain fields and thermal variations through the strain-optic and thermo-optic effects. However, physical constraints do not allow the refractive index to change on scales as short as these methods are capable of resolving. We demonstrate that this imposes a practical limitation of resolution on sensing applications. We use finite element modelling and compare this with experimental results. Longitudinal and transverse strains, as well as high resolution temperature sensing are considered. We show that the practical resolution limits are 40 µm for transverse stress sensing, 100 µm for longitudinal strain and 800 µm for thermal sensing.

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Fiber grating sensors for structural health monitoring of aerospace structures

Cited by 9 publications

References 4 publications

Optical Sensors for Corrosion Monitoring

Optical Sensors for Corrosion Monitoring

Integrated fiber optic sensors for hot spot detection and temperature field reconstruction in satellites

Practical spatial resolution limits of high-resolution fibre Bragg grating sensors using layer peeling

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