An apparatus and method for detecting anomalies in ferrous pipe structures is presented. A sensor having one or more sensor shoe members is placed in the interior of a ferrous pipe structure to be inspected. Each sensor shoe member has one or more magnetic field generating apparatus, with a three-axis...http://www.google.ca/patents/US5537035?utm_source=gb-gplus-sharePatent US5537035 - Apparatus and method for detecting anomalies in ferrous pipe structures
