Method and apparatus for fracture detection along surfaces and boreholes by means of ultrasonic echography

摘要

The invention relates to a method and a fracture detection apparatus by ultrasonic echography along the wall of a material or a formation.; The proposed method comprises the transmission and reception of a beam of small opening angle of the ultrasonic signals having a propagation direction perpendicular to the wall, these signals passing through a small known thickness of an intermediate material forming no parasite interface. Detecting the possible reception of reflected signals during at least one time interval or time window previously determined.; Application to the detection of fractures, in particular in the wall of a survey.