METHOD AND APPARATUS FOR ACOUSTIC EMISSION DIAGNOSIS OF DEFECTS OF OFF-SHORE SLEET-PROOF STRUCTURES Russian patent published in 2015 - IPC G01N29/14 G01H17/00 

FIELD: physics, acoustics.

SUBSTANCE: invention can be used for acoustic emission diagnosis of off-shore sleet-proof structures. The method comprises installing acoustic emission transducers of the audio range in critical structural components of a structure; detecting acoustic emission signals and determining the extent of the defect of the structure from parameters of the acoustic emission signals; wherein the method further includes installing in the critical structural components of the structure a group of accelerometers which detect mechanical stress of low-frequency vibrations in the infra-sound range, and then calculating a first cross-correlation function between signals coming from the acoustic emission transducers and the accelerometers, and then a second cross-correlation function between signals coming from each pair of nearest acoustic emission transducers, wherein defects of the structure are identified from the amplitude and shape of maxima of each correlation function, and coordinates of the defects are determined from the time delay of the maximum of the second correlation function between each pair of acoustic emission transducers.

EFFECT: high reliability of detection and diagnosis of hidden defects of offshore sleet-proof structures.

2 cl, 1 dwg