Method of detecting cracks in constructions

G - Physics – 01 – N

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G01N 29/04 (2006.01) G01N 29/14 (2006.01) G01S 5/22 (2006.01)

Patent

CA 1178706

ABSTRACT The invention relates to the monitoring of the presence of cracks, formation of cracks and growth of cracks in constructions, preferably complex steel con- structions, for example off-shore platforms. The crack indication is brought about by recording and analysis of acoustic emission from a crack in the construction and the invention is characterized in that a plurality of sensors, for example microphones or hydro- phones, are mounted in the medium which surrounds the construction and record acoustic emissions from a crack to the medium which surrounds the construction. The sig- nals measured by means of the sensors are fed to a signal analysis system in a computor which renders it possible to determine the position of the emission source, that is to say the crack, by analysis of the sensor signals caused by acoustic emission.

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