Infrared measuring apparatus and method for on-line application in manufacturing processes
First Claim
1. An apparatus for mixing and distributing light from a single sample area of a web of material for simultaneous detection of a plurality of characteristics of the web of material as the web is being manufactured, said apparatus comprising:
- A detector light homogenizer receiving light from said sample area and distributing that light uniformly over an output of said detector light homogenizer; and
A light distributor receiving light from said output of said detector light homogenizer and distributing uniformly divided portions of said light to a plurality of distributed outputs so that said plurality of distributed outputs effectively see portions of the same sample area.
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Accused Products
Abstract
A single vane shutter flag is asynchronously controlled so that a measuring system light source is interrupted for a minimum necessary amount of time for standardization/calibration and normalization of InGaAs system detectors. Source/detector hemispheres or serially connected randomly oriented fiber bundles homogenize light passing to the detectors. Light source testing is performed by measuring spectral power distributions at a plurality of light source power levels and comparing the measurements to baseline characteristics established for the light source. Calibration sample life is extended indefinitely by controlling the shutter flag to block source light except for short calibration time periods during which standard light levels are provided.
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Citations
10 Claims
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1. An apparatus for mixing and distributing light from a single sample area of a web of material for simultaneous detection of a plurality of characteristics of the web of material as the web is being manufactured, said apparatus comprising:
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A detector light homogenizer receiving light from said sample area and distributing that light uniformly over an output of said detector light homogenizer; and
A light distributor receiving light from said output of said detector light homogenizer and distributing uniformly divided portions of said light to a plurality of distributed outputs so that said plurality of distributed outputs effectively see portions of the same sample area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification