Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Reexamination Certificate
2008-01-21
2010-10-12
Lauchman, L. G (Department: 2877)
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
C356S317000, C356S073000, C356S051000, C250S458100, C250S459100
Reexamination Certificate
active
07812947
ABSTRACT:
A method includes illuminating a material using first light. The first light is associated with one or more ultraviolet wavelengths/wavelength bands, and the material includes pulp fibers. The method also includes measuring second light from the material, where the second light is based on the first light. The method further includes determining an amount of lignin in the material using the measured second light. The ultraviolet wavelengths/wavelength bands could include at least one wavelength between 260 nanometers and 300 nanometers, inclusive (such as 280 nm). The one or more ultraviolet wavelengths/wavelength bands could additionally include 205 nanometers, 250 nanometers, 300 nanometers, and/or 360 nanometers. The method could also include illuminating the material using third light and measuring fourth light from the material, where the fourth light is based on the third light. The third light is associated with at least one wavelength/wavelength band that falls within a non-absorption wavelength band of lignin.
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Shakespeare John F.
Shakespeare Tarja T.
Honeywell International , Inc.
Lauchman L. G
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