Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1987-02-17
1990-05-22
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250341, 2503581, 2503601, G01N 2135
Patent
active
049280139
ABSTRACT:
An infrared paper web moisture sensor is described which comprises a source of infrared radiation for directing an infrared beam through the web and an infrared detecting unit disposed on the opposite side of the web from the infrared source. In one embodiment, the infrared detecting unit measures the transmission of the infrared beam through the web at three separate wavelength regions of the infrared spectrum, one of which is sensitive to web temperature. In a second embodiment, the infrared detecting unit measures the transmission of the infrared beam through the web at two separate wavelength regions of the infrared spectrum, one of which is insensitive to web temperature. For each embodiment, signals are developed indicative of the transmission of infrared through the web in each of these regions, digitized, and fed to the process control computer for the paper mill. The computer combines the values of the digitized signals, via an empirically derived equation, to produce a value indicative of the percentage of moisture in the web. The process control computer utilizes this result of control devices which selectively add moisture to portions of the web or selectively dry portions of the web to thereby produce a web having a uniform moisture content.
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Vakulyuk et al., "Infrared Water-Content Meter for Paper," Measurement Techniques, vol. 19, No. 7, pp. 1065-1066, Jul. 1976.
Pugh, "The Infrared Measurement of Surface Moisture in Paper", Tappi, vol. 63, No. 10, pp. 131-134, Oct. 1980.
Anderson Leonard M.
Howarth John
Howell Janice A.
Measurex Corporation
Rauchholz William F.
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