Flaw detector for metal material

Details Flaw detector for metal material Flaw detector for metal material

G - Physics

01

N

G01N 27/82 (2006.01) G01N 27/90 (2006.01)

Patent

CA 2048496

The present invention relates to a flaw detector for metal material which can maintain and manage pipelines by means of the remote field eddy current method and a remote field eddy current sensor apt for the above detector. In the flaw detector for metal material, AC signal having a constant level and shifted in a predetermined phase angle are added with received signal received in receiving coils of the remote field eddy current sensor. Thus stable phase detection in a normal part of the pipeline to be tested can be obtained and precise diagnosis to the pipeline to be tested can be performed by preventing generation of abnormal flaw data. Further, when using an AGC circuit in order to maintain the received signal level provided by the received coils, S/N ratio of the flaw data can be improved by stabilization of the received signal level. Further, is providing a receiving coils which receive the remote field eddy current and another receiving coil which have fewer number of turns than that of said received coils and are spaced further from the exciting coil than the predetermined distance, a stable data as to both of the gradually flaw progressing part and the local flaw progressing part can be obtained by the remote field eddy current sensor.

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