| 摘要 |
2136735 9325864 PCTABS00028 The invention concerns a method and an apparatus for determining the size and shape of a slot, for measuring, e.g., the profile of the discharge opening (slice) of a paper machine. In the method, by means of at least two magnetometers (6) attached to an edge (2 and/or 5) of the slot, the magnetic field depending on the size and shape of the slot is measured. According to the invention, an alternating electrical current is applied to a current conductor (1) attached to the edge (2 and/or 5) of the slot to create an alternating magnetic field, measurement of the alternating magnetic field is phase-locked with the applied electrical current, and the size (d) and shape of the slot are calculated from the measured values of the magnetic field.
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