Patent ID: 6961126
Filing Date: 2005-11-01
Classification: G01J

Abstract:
1. A multichannel wavelength measurement device comprising: multiple optical detectors, each detector adapted to detect light at a different wavelength; and a sequence of optical wavelength splitters in an optical path, each of the optical splitters adapted to provide light to one of the detectors at the desired detected wavelength of the detector wherein one desired detected wavelength is at a wavelength that indicates the presence of water in paper wherein a first detector receives light provided by a first optical splitter, the first optical splitter providing light at a second wavelength to a second optical splitter which provides the light at the second wavelength to a second optical detector wherein the optical splitters are pass filters wherein at least one of the pass filters is a high pass filter or a low pass filter and wherein the multichannel wavelength measurement device is used to determine characteristics of paper.