Patent ID: 8344725

Claim:
A device for nondestructive testing of a pipe made of ferromagnetic steel for detection of longitudinal, transverse or inclined flaws using magnetic or magnetic-induction test procedures, comprising: a magnetizing yoke which transmits the magnetic flux contactless into the pipe, at least two magnetic-field-sensitive scanning probes having GMR sensors, wherein the GMR sensors are combined into at least two sensor groups in form of a sensor array, with the GMR sensors in a sensor group being electrically connected in parallel, a single preamplifier connected to each sensor group in one-to-one correspondence, and an evaluation unit, wherein the sensor arrays of different sensor groups are arranged, as viewed in a test direction of the pipe, sequentially in the test direction and with a mutual offset to one another perpendicular to the test direction in such a way that at least one GMR sensor of an array of one sensor group overlaps in the test direction with a GMR sensor in an array of another sensor group wherein at least two of the sensor arrays are arranged on top of one another in a radial direction of the pipe, so that the GMR sensors of different arrays of the at least two arrays have different distances from a surface of the pipe and sensors of one of the at least two sensor arrays overlap with sensors of another of the at least two sensor arrays.