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US 5,963,032 AGranted
Non-destructive testing equipment having SQUID-type sensor in magnetic shield container and object-magnetizing magnetic field generator
AssigneeSumitomo Electric Industries, Ltd.
InventorHirokazu Kugai
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Abstract
A nondestructive testing equipment comprises a magnetic sensor located within a magnetic shield container. The magnetic sensor includes a SQUID that is a magnetic sensor having a very high sensitivity. A magnetically uniform inspection zone is formed in the magnetic shield container. While a rod-like material to be tested passes through the inspection zone at a uniform velocity, the magnetic sensor can detect an appreciable magnetic field variation that is caused by impurities or minor defects contained in the object to be tested.
Claims7
A non-destructive testing equipment comprising:
- a magnetic shield container defining an inspection zone within an internal space of said magnetic shield container, so that an object to be tested can be positioned in said inspection zone, said magnetic shield container preventing an environment magnetic field from invading said internal space of said magnetic shield container;
- magnetic sensor means for detecting a magnetic field in said inspection zone, and for detecting variations in said magnetic field caused by impurities or defects in said object, said magnetic sensor means being located in said magnetic shield container and having at least one SQUID;
- and
- a magnetic field generator located at an outside of said magnetic shield container, for producing a magnetized state in said object to be tested before said object to be tested is introduced into said magnetic shield container whereby said magnetic sensor means, when said magnetized state has been produced in said object to be tested and when said object is then introduced into said magnetic shield container, detects variations in said magnetic field caused by variations in said magnetized state of said object, said variations in said magnetized state being generated by impurities or defects in said object.
1 more element
Dependencies are inferred from the claim text.