Sheet measurement

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United States of America Patent

PATENT NO 9574994
APP PUB NO 20150136993A1
SERIAL NO

14402989

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A detector receives optical radiation interacted with the measured sheet and is responsive to a predetermined optical absorption band of lignin, a predetermined optical absorption band of dry matter and two or more separate optical bands. The measuring unit measures a lignin dependent value on the basis of attenuation in the absorption band of lignin, and a dry matter dependent value on the basis of attenuation in the absorption band of the dry matter, and determines a general dependence of attenuation with respect to wavelength by measuring attenuations in the separate optical bands. The measuring unit forms a value representing a dry matter content on the basis of the lignin dependent value, the dry matter dependent value and the general dependence of attenuation.

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Patent Owner(s)

  • METSO AUTOMATION OY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Mäntylä, Markku Kangasala, FI 19 31

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