Optics: measuring and testing – Of light reflection
Patent
1981-07-27
1983-12-27
Rosenberger, R. A.
Optics: measuring and testing
Of light reflection
250571, 356243, 356429, G01N 2147
Patent
active
044227663
ABSTRACT:
A moisture analyzer sequentially directs a transmitted reference energy beam and a transmitted measurement energy beam toward a mirrored surface background plate as spaced plastic sheets advance along a path through the beams. During the testing period, beams are reflected from the sheets and plate as sheet and plate reflected measured beams and during the non-testing period only from the plate as plate reflected reference and measured beams. The reflected beams generated during the testing period are measured using a detector circuit to determine moisture content of the sheets. The background plate is selected to provide during the non-testing period a value as indicated by the detector circuit that is within the acceptable range for sheets as indicated by the detector circuit operating on the reflected beams generated during the testing period to reduce response time of the detector circuit changing from the non-testing period to the testing period.
REFERENCES:
patent: 3840303 (1974-10-01), Clarke
patent: 4160913 (1979-07-01), Brenholdt
patent: 4277177 (1981-07-01), Larsen et al.
patent: 4319847 (1982-03-01), Howarth
Lepiane Donald Carl
PPG Industries Inc.
Rosenberger R. A.
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