ELECTROMAGNETIC SUPERSONIC SENSOR FOR DETECTING PIPE CORROSION

摘要

PROBLEM TO BE SOLVED: To provide an electromagnetic supersonic sensor enabling to detect position of corrosion and scars of a pipe in the circumferential direction.;SOLUTION: An electromagnetic supersonic sensor to detect scars of a pipe 10, comprises a transmitting unit TX which is provided at a first position P0 in the pipe circumferential direction, has a first magnetic field providing means 30 which provides a magnetic field to the pipe and an eddy current generation coil 32 which generates eddy currents in the pipe, and generates supersonic waves in the pipe, and a plurality of receiving units which are located at least a second and third positions in the pipe circumferential direction, and has a second magnetic field providing means 50 which provides a magnetic field to the pipe and an eddy current detection coil 52 which detects eddy currents generated in the pipe. The present invention is characterized such that lengths of 2 propagation paths which are from the first position P0 to the second position P1 along the circumference in different directions are not the same, and lengths of 2 propagation paths which are from the first position P0 to the third position P2 along the circumference in different directions are also not the same.;COPYRIGHT: (C)2006,JPO&NCIPI