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Method and Apparatus for Magnetically Testing Metal Tapes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Weischedel, Herbert R. |
| Copyright Year | 2017 |
| Abstract | Magnetic flux is induced in the tape by applying a mag netic field to the tape. Where there is a perforation or a crack air gaps are created and magnetic flux radiates outwardly from the tape across these air gaps. The presence of the crack is detected by sensing the radiat ing flux at two distances from the tape. At one distance, close to the tape, the total flux is the sum of the flux from the crack and the perforation. At the other dis tance, further from the tape, the flux is solely that pro duced by the perforation. A coil is placed at each posi tion to sense the flux. The tape is moved, which causes the flux to intersect the coils. The intersection produces an output signal from each coil. The signal produced by the coil further from the tape is subtracted from the signal produced by the coil closer to the tape; the differ ence being a signal caused by the additional flux pro duced by the crack. An alarm is sounded and in indica tor lights when the signal is present. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://patentimages.storage.googleapis.com/74/3c/75/76699637deaa5a/US4270088.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
