Eddy current inspection technique

A current and eddy current technology, applied in the direction of electromagnetic measuring devices, electric/magnetic thickness measuring, measuring devices, etc., can solve the problems of local wall thickness reduction, inability to detect corrosion points, size increase, etc.
CN1155795CInactive Publication Date: 2004-06-30TUV RHEINLAND SONOVATION HLDG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TUV RHEINLAND SONOVATION HLDG
Publication Date
2004-06-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

Device (9) for inspecting an object (2) of electrically conductive material, comprising a non-static-signal transmitter for generating an electromagnetic field in the object (2), and a receiver (20, 21) for measuring the variations of the eddy current generated by the non-static electromagnetic field and for producing a signal representing the decay of the eddy current, wherein the non-static-signal transmitter comprises at least two laterally spaced-apart emitters (11, 12) for emitting an electromagnetic field, which emitters (11, 12) are, during normal operation, so driven that the resulting electromagnetic field in the central region (26), between the emitters (11, 12), is intensified.
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Description

Technical field

[0001] The present invention relates to a technique for detecting objects made of conductive materials. The technical term "detection object" used in this specification and various claims refers to the measurement of the thickness of the object, the detection of whether there are subsurface cracks in the object, and the detection of non-conductive surrounding objects. The thickness of the sexual material layer implements technical operations such as measurement. For example, such objects can be container walls, pipe walls, and so on. Background technique

[0002] The effective thickness of objects such as steel containers, water pipes and water tanks may change locally due to external or internal corrosion. For the occasion where the object is covered with an insulating material layer, if the corrosion condition is to be inspected with the naked eye, the insulating material needs to be removed, which is not only a waste of time, but also expensive.

[0003] Europe...

Claims

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