METHOD OF DETECTING, PREFERABLY CONTINUOUSLY, THE PRESENCE OF CRACKS, THE FORMATION OF CRACKS AND THE GROWTH OF CRACKS IN CONSTRUCTIONS

摘要

The invention relates to the monitoring of the presence of cracks, formation of cracks and growth of cracks in constructions, preferably complex steel constructions, for example off-shore platforms (1). The crack indication is brought about by recording and analysis of acoustic emission from a crack (12) in the construction and the invention is characterized in that a of sensors (7, 8, 9, 10), for example microphones or hydrophones, are mounted in the medium which surrounds the construction and record acoustic emissions from a crack (12) to the medium with surrounds the construction. The signals measured by means of the sensors are fed to a signal analysis system in a computer (11) 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.