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.

Inactive Publication Date: 2004-06-30
TUV RHEINLAND SONOVATION HLDG
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Corrosion spots whose size is comparable to the size of the excitation coil can be detected with this known device, but it has been found that this device cannot detect corrosion spots whose size is much smaller than the size of the coil, and such small corrosion spots May reduce local wall thickness to very severe levels
Also, such small corrosion spots may grow rapidly in size when, for example, liquid water is present between the pipe and the insulating material surrounding the pipe.

Method used

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Embodiment Construction

[0024] In the following description, the same reference numerals denote the same parts.

[0025] FIG. 1 shows a probe 1 for detecting an object made of conductive material. This probe 1 can be used to detect the thickness of the pipe wall 2 on the pipe 3 to detect the corrosion state on the pipe wall 2. Corrosion may occur at the outside surface or inside surface of the pipe wall 2. A layer of insulating material 5 is arranged around the tube 3, and a sleeve 7 made of thin metal steel is covered on the outside of the insulating material layer 5. The probe 1 includes a device 9 for detecting an object made of conductive material, and the device 9 is held at a position opposite to the outer surface of the steel sleeve 7 during normal operation.

[0026] As shown in Figures 2 and 3, the device 9 for detecting objects made of conductive materials includes a non-steady-state signal transmitter for generating a non-steady-state electromagnetic field in an object such as a tube wall 2, e...

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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.

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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Application Information

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IPC IPC(8): G01B7/00G01B7/06G01N27/90
CPCG01N27/904G01B7/06
Inventor 佩奇斯·威勒姆·万·安德尔马克·瑟道尔·鲁杰玛滕·洛伦兹里克·埃多杜·里卡多·迈耶
Owner TUV RHEINLAND SONOVATION HLDG
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