Method and apparatus for determining properties of a moving web with a differential coil sensor
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United States of America Patent
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Apr 2, 2002
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N/A
app pub date -
Feb 12, 1999
filing date -
Feb 26, 1998
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Abstract
The invention relates to a method and an apparatus for measuring properties of a moving web, a sensor (1) being arranged on a first side of the moving web (7), the sensor comprising a differential coil (3), which comprises at least two coils, and a reference plate (4). A sensor plate (6) is arranged on a second side of the moving web (7). Electric current is used to induce a voltage to the differential coil (3). The voltage of the differential coil (3) varies as the web (7) changes the effect caused by the sensor plate (6) to the differential coil. The properties of the web (7) are determined by measuring the voltage of the differential coil (3).
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