Device and Method for Examining a Solid, Elongate Product to be Tested
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United States of America Patent
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Issued Date -
May 15, 2008
app pub date -
Mar 6, 2006
filing date -
Apr 5, 2005
priority date (Note) -
Abandoned
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Abstract
The device for examining a solid, elongate product to be tested contains a measurement capacitor with a measurement part-electrode and guard electrodes electrically insulated therefrom. The device further comprises means for applying an alternating voltage to the measurement capacitor for the purpose of generating an alternating electrical field in the measurement capacitor. The guard electrodes are set up for active guarding, in that, with regard to the alternating voltage, they are kept at the same potential as the measurement part-electrode. Differently thick products to be tested may be tested with one and the same measurement head thanks to the active guarding. The signal noise is reduced, the output signal is largely independent of the position of the product to be tested in the transverse direction, and the measurement head has small geometric dimensions.
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