G - Physics – 01 – N
Patent
G - Physics
01
N
324/50
G01N 27/82 (2006.01) G01R 33/12 (2006.01)
Patent
CA 1149461
METHOD AND APPARATUS FOR TESTING METAL TAPES ABSTRACT Magnetic flux is induced in the tape by applying a magnetic 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 radiating 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 distance, further from the tape, the flux is solely that produced by the perforation. A coil is placed at each position 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 difference being a signal caused by the additional flux produced by the crack. An alarm is sounded and in indicator lights when the signal is present. -1-
339763
Weischedel Herbert R.
Gowling Lafleur Henderson Llp
Otis Elevator Company
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