Paper making and fiber liberation – Apparatus – Measuring – testing – inspecting – indicating or illuminating
Reexamination Certificate
2006-02-28
2009-02-24
Halpern, Mark (Department: 1791)
Paper making and fiber liberation
Apparatus
Measuring, testing, inspecting, indicating or illuminating
C162S198000, C250S339100, C324S694000, C700S128000, C700S129000
Reexamination Certificate
active
07494567
ABSTRACT:
Temperature measurements of sheet material such as paper can be obtained directly from an analysis of the absorption spectrum of water in the infrared region. The technique is based in part on the recognition that the central wavelength position of a selected moisture peak is dependent upon the sheet temperature; the wavelength position also has a known temperature sensitivity. Thus, once the wavelength position of this moisture peak is ascertained, the moisture temperature of the product being monitored can be calculated. The position of the moisture peak is preferably obtained from the derivative of the peak. By measuring the size of the infrared absorption and the wavelength position of the absorption peak, both the moisture content and the moisture temperature of the sheet material can be determined. The data is used for process control. Tunable laser diodes are particularly suited as the source of infrared radiation for the temperature sensors.
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Cascio Schmoyer & Zervas
Halpern Mark
Honeywell ASCA Inc.
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