Apparatus for measuring the basis weight
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United States of America Patent
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Nov 19, 1996
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N/A
app pub date -
Mar 12, 1996
filing date -
Mar 17, 1995
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Abstract
An apparatus for measuring the basis weight of a web-shaped material under test comprises a radioactive .beta. radiation source on one side of the material under test and a .beta. radiation detector on the other side of the material under test. For focusing the electrons emitted by the radioactive .beta. radiation source, a magnetic field is provided, such that for the same source activity, significantly more .beta. particle intensity is available on the material under test for measuring the transmission.
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