Apparatus for measuring the basis weight

Details Apparatus for measuring the basis weight Apparatus for measuring the basis weight

1996-03-12

1996-11-19

Fields, Carolyn E.

Radiant energy

Inspection of solids or liquids by charged particles

Including a radioactive source

2503581, G01N 2316

Patent

active

055765416

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.

REFERENCES:
patent: 4194114 (1980-03-01), Pankratov et al.
patent: 4678915 (1987-07-01), Dahlquist et al.
patent: 4920265 (1990-04-01), Chase et al.

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