Wire rope flaw detection device
US-2018299408-A1 · Oct 18, 2018 · US
Magnetic testing method and apparatus
US9291599B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9291599-B2 |
| Application number | US-201214238958-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 15, 2012 |
| Priority date | Aug 18, 2011 |
| Publication date | Mar 22, 2016 |
| Grant date | Mar 22, 2016 |
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Abstract
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A magnetic testing apparatus 100 according to the present invention comprises: a first magnetizing device 1 for applying a DC bias magnetic field to a test object P in substantially parallel to the direction in which a flaw F to be detected extends; a second magnetizing device 2 for applying an AC magnetic field to the test object P substantially perpendicularly to the direction in which the flaw F to be detected extends; and a detecting device 3 for detecting leakage flux produced by the magnetization of the test object P accomplished by the first magnetizing device 1 and the second magnetizing device 2.
First claim
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The invention claimed is: 1. A magnetic testing method comprising: applying, to a test object, a rotating bias magnetic field which is excited by using an AC current as an exciting current; applying, to the test object, a rotating AC magnetic field which is excited by using a superimposed AC current in which a first AC current of the same frequency as that of the AC current that is the exciting current for the rotating bias magnetic field and a second AC current of a frequency higher than that of the first AC current are superimposed as an exciting current and which is 90 degrees out of phase with respect to the rotating bias magnetic field; and detecting a flaw based on leakage flux produced by the application of the magnetic fields. 2. A magnetic testing apparatus comprising: a first rotation magnetizing device for applying, to a test object, a rotating bias magnetic field which is excited by using an AC current as an exciting current; a second rotation magnetizing device for applying, to the test object, a rotating AC magnetic field which is excited by using an superimposed AC current in which a first AC current of the same frequency as that of the AC current that is the exciting current for the rotating bias magnetic field and a second AC current of a frequency higher than that of the first AC current are superimposed as an exciting current and which is 90 degrees out of phase with respect to the rotating bias magnetic field; and a detecting device for detecting leakage flux produced by the magnetization of the test object accomplished by the first rotation magnetizing device and the second rotation magnetizing device.
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- What does patent US9291599B2 cover?
- A magnetic testing apparatus 100 according to the present invention comprises: a first magnetizing device 1 for applying a DC bias magnetic field to a test object P in substantially parallel to the direction in which a flaw F to be detected extends; a second magnetizing device 2 for applying an AC magnetic field to the test object P substantially perpendicularly to the direction in which …
- Who is the assignee on this patent?
- Suzuma Toshiyuki, Nakao Yoshiyuki, Sakamoto Makoto, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification G01N27/83. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 22 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).