METHOD OF DETERMINING DISTANCE BETWEEN CONVERTER AND SOURCE OF ACOUSTIC EMISSION

摘要

FIELD: physics. ^ SUBSTANCE: acoustic emission converter is mounted on the inspected object. The object is loaded. Acoustic emission signals generated by a defect in the object are received and Lamb wave modes are picked up in form of a wave packet. The time-frequency characteristic is obtained on spectrograms, after which energy maxima of antisymmetric and symmetric modes are picked up. The distance between the converter and the source of acoustic emission is calculated from the difference in arrival time of energy maxima on the selected frequencies. ^ EFFECT: increased reliability and information content when determining the distance between a converter and a source of acoustic emission, and increased noise immunity. ^ 3 dwg