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  • Köppe, Enrico (2) (entfernen)

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  • 8.1 Sensorik, mess- und prüftechnische Verfahren (2) (entfernen)

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A contribution to intelligent automatic validation of structure-integrated fibre optic strain sensors (2017)
Schukar, Vivien ; Köppe, Enrico ; Hofmann, Detlef ; Mitzkus, Anja ; Gong, Xin ; Sahre, Mario ; Bartholmai, Matthias ; Beck, Uwe
An auto-validation tool for the reliability quantification of materials integrated fiber Bragg grating (FBG) strain sensors have been developed and tested. The FBG strain sensor was jacketed with a magnetostrictive layer based on iron-nickel which, when excited by a specific magnetic field, adds an artificial strain to the sensor. The fixed relationship between magnetic induction and wavelength shift of the FBG strain sensor characterizes the bond strength and adhesion between the sensor and the surrounding structure. Due to an easily applicable magnetic field, it is possible to validate the sensor performance in a non-contact, fast way without disturbing the data-acquisition process.
Magnetic field detection with an advanced FBG-based sensor device (2016)
Schukar, Vivien ; Köppe, Enrico ; Hofmann, Detlef ; Westphal, Anja ; Sahre, Mario ; Gong, Xin ; Bartholmai, Matthias ; Beck, Uwe
A high-performance fiber Bragg grating-based (FBG) sensor device has been developed for the detection of small magnetic fields. Based on a smart multilayer jacket around the fibre over the physical length of the FBG, magnetic fields generated by rotating machine parts, power generators or power cable can be easily detected, analysed and evaluated. Consequently, this innovative, on-line and non-contact inspection method results in an increase in quality and reliability of high-performing machine parts, devices and cables. The basic physical principle is based on a magnetostrictive multilayer system that strains the high-resolution FBG element in presence of magnetic fields. Subsequently, a fixed relationship between induced magnetic field and wavelength change of the FBG element describes the characteristic sensitivity curve. Intensive tests regarding characterisation of this magnetic field FBG sensor have been carried out and its performance has been evaluated.
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