Only recently available, the fibre optic distributed sensing technique is becoming a powerful tool for structural tests. Among the different techniques available, we were using OBR. The OBR uses swept wavelength interferometry (SWI) to measure the Rayleigh backscatter as a function of length in optical fiber with high spatial resolution. The SWI approach enables robust and practical distributed temperature and strain measurements in standard fiber with millimeterscale spatial resolution over hundreds of meters of fiber with strain and temperature resolution as fine as 1 microstrain and 0.1 °C. Structural damage detection from direct strain measurements can be done only when the sensors are very closely located to the damage initiation point, which is generally impossible to predict. With the availability of high resolution distributed sensing, strains along a continuous line can be obtained, so a crack crossing or growing near to the sensing line will be detected. As a classical aeronautical structure, an experiment for detecting the fatigue cracks developed at a rivet joint were done. The high potential of the technique has been demonstrated.
Damage detection in bolted joints by fibre optics distributed sensing
Schadensnachweis in Bolzenverbindungen durch faseroptische verteilte Abtastung
2010
6 Seiten, 4 Bilder, 10 Quellen
Conference paper
Storage medium
English
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