Moisture measurement
First Claim
1. An apparatus for measuring an object comprising cellulose material and at least one coloring substance including printing ink, wherein the apparatus comprisinga detector and a measuring unit;
- the detector being configured to receive optical radiation transmitted through the measured object within the optical band ranging from 1.8 μ
m to 2.25 μ
m and being responsive to one or more predetermined optical absorption bands of water, one or more predetermined optical absorption bands of cellulose and two or more separate optical bands known to include spectral disturbance caused by the at least one coloring substance, the separate optical bands being apart from the predetermined optical bands associated with water and cellulose, at least two of the separate optical bands being on both sides of a predetermined optical band associated with water and at least two of the separate optical bands being on both sides of a predetermined optical band of cellulose;
the measuring unit being configured to, on the basis of responses of the detector,measure at least one water dependent value on the basis of attenuation of the optical radiation in the one or more predetermined optical absorption bands of water, measure at least one cellulose dependent value on the basis of attenuation of the optical radiation in the one or more predetermined optical absorption bands of cellulose,determine general dependence of attenuation with respect to wavelength including spectral disturbance caused by the at least one coloring substance as a desired type of function by measuring attenuations at the measured wavelengths apart from the predetermined bands associated with water and cellulose;
form each of at least one corrected water value on the basis of the desired type of function and a corresponding water dependent value, andform each of at least one corrected cellulose value on the basis of the desired type of function and a corresponding cellulose dependent value, andform a moisture value on the basis of at least one corrected moisture value and at least one corrected cellulose value, for compensating for the spectral disturbance of the at least one coloring substance.
3 Assignments
0 Petitions
Accused Products
Abstract
Detector receives optical radiation transmitted through measured object and is responsive to one or more predetermined optical absorption bands of water and cellulose and two or more separate optical bands related to spectral disturbance caused by coloring substance. The measuring unit measures, on basis of responses of the detector, a water dependent value on basis of attenuation of optical radiation in predetermined optical absorption band of water, a cellulose dependent value on basis of attenuation of optical radiation in predetermined optical absorption band of cellulose, determines general dependence of attenuation with respect to wavelength including spectral disturbance caused by coloring substance by measuring attenuations in predetermined separate optical bands apart from predetermined bands of water and cellulose, and forms a moisture value on basis of moisture dependent value, cellulose dependent value, and general dependence of attenuation for compensating for spectral disturbance of at least one coloring substance.
16 Citations
21 Claims
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1. An apparatus for measuring an object comprising cellulose material and at least one coloring substance including printing ink, wherein the apparatus comprising
a detector and a measuring unit; -
the detector being configured to receive optical radiation transmitted through the measured object within the optical band ranging from 1.8 μ
m to 2.25 μ
m and being responsive to one or more predetermined optical absorption bands of water, one or more predetermined optical absorption bands of cellulose and two or more separate optical bands known to include spectral disturbance caused by the at least one coloring substance, the separate optical bands being apart from the predetermined optical bands associated with water and cellulose, at least two of the separate optical bands being on both sides of a predetermined optical band associated with water and at least two of the separate optical bands being on both sides of a predetermined optical band of cellulose;the measuring unit being configured to, on the basis of responses of the detector, measure at least one water dependent value on the basis of attenuation of the optical radiation in the one or more predetermined optical absorption bands of water, measure at least one cellulose dependent value on the basis of attenuation of the optical radiation in the one or more predetermined optical absorption bands of cellulose, determine general dependence of attenuation with respect to wavelength including spectral disturbance caused by the at least one coloring substance as a desired type of function by measuring attenuations at the measured wavelengths apart from the predetermined bands associated with water and cellulose; form each of at least one corrected water value on the basis of the desired type of function and a corresponding water dependent value, and form each of at least one corrected cellulose value on the basis of the desired type of function and a corresponding cellulose dependent value, and form a moisture value on the basis of at least one corrected moisture value and at least one corrected cellulose value, for compensating for the spectral disturbance of the at least one coloring substance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring an object comprising cellulose material and at least one coloring substance including printing ink, the method comprising
allowing optical radiation being transmitted through a measured object; -
measuring at least one water dependent value on the basis of attenuation of the optical radiation transmitted through the measured object in one or more predetermined optical absorption bands of water; measuring at least one cellulose dependent value on the basis of attenuation of the optical radiation transmitted through the measured object in one or more predetermined optical absorption bands of cellulose within the optical band ranging from 1.8 μ
m to 2.25 μ
m;determining general dependence of attenuation of the optical radiation transmitted through the measured object with respect to wavelength, by measuring attenuations in two or more predetermined separate optical bands known to include spectral disturbance caused by the at least one coloring substance, as a known type of function, at least two of the separate optical bands being on both sides of a predetermined optical band associated with water and at least two of the separate optical bands being on both sides of a predetermined optical band of cellulose; and forming each of at least one corrected water value on the basis of the desired type of function and a corresponding water dependent value, and forming each of at least one corrected cellulose value on the basis of the desired type of function and a corresponding cellulose dependent value; and forming a moisture value on the basis of at least one corrected moisture value and at least one corrected cellulose value for compensating for the spectral disturbance of the at least one coloring substance. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for measuring an object comprising cellulose material and at least one coloring substance including printing ink, the apparatus comprising:
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at least one processor; and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to perform allowing optical radiation propagate through a measured object comprising cellulose material and the at least one coloring substance; measuring at least one water dependent value on the basis of attenuation of the optical radiation transmitted through the measured object in one or more predetermined optical absorption bands of water; measuring at least one cellulose dependent value on the basis of attenuation of the optical radiation transmitted through the measured object in one or more predetermined optical absorption bands of cellulose within the optical band ranging from 1.8 μ
m to 2.25 μ
m;determining general dependence of attenuation of the optical radiation transmitted through the measured object with respect to wavelength, by measuring attenuations in two or more predetermined separate optical bands known to include spectral disturbance caused by the at least one coloring substance, as a known type of function, at least two of the separate optical bands being on both sides of a predetermined optical band associated with water and at least two of the separate optical bands being on both sides of a predetermined optical band of cellulose; and forming each of at least one corrected water value on the basis of the desired type of function and a corresponding water dependent value, and forming each of at least one corrected cellulose value on the basis of the desired type of function and a corresponding cellulose dependent value; and forming a moisture value on the basis of at least one corrected moisture value and at least one corrected cellulose value for compensating for the spectral disturbance of the at least one coloring substance. - View Dependent Claims (19, 20, 21)
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Specification