Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1975-05-29
1976-06-22
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250226, 250571, 250578, G01N 2126, G01J 334
Patent
active
039653560
ABSTRACT:
Measuring apparatus is used as a control element to maintain the correct ratio of chlorine to pulp in a bleach plant. Two diffusing windows are used; one to randomly radiate electromagnetic energy into the pulp and the other to receive radiation from the bulk of the pulp and reradiate it. Two bands of radiation are examined; one in the visible and the other in the infrared. Rather than using a conventional beam splitter, two detection systems, differing only in their spectral pass band, are used. Their optical axes converge in the center of the receiving window so that identical images of the receiving window can be projected on each of the detectors. The detector system allows the use of interference type filters which require sensibly parallel radiation. In addition to sensing the brightness of pulp, which is affected by the amount of chlorine, the above apparatus is useful for concurrently measuring opacity, moisture content, and basis weight of a moving sheet. A single sided moisture gauge is also provided which eliminates the effects of flutter.
REFERENCES:
patent: 3177757 (1965-04-01), Polanyi
Grigsby T. N.
Measurex Corporation
Smith Alfred E.
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