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US 8,553,228 B2Granted
Web inspection calibration system and related methods
Assignee3M Innovative Properties Company
InventorJustin W. Wilhelm
Life of this patent
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Abstract
Systems and methods for calibrating a web inspection system using data from a calibrated point sensor, using a frequency spectra-based analysis. A sensor measures a web property of interest, which is then converted into the frequency domain, as is information from a web inspection system. A correlation model is then created to allow calibration of the web inspection system.
Claims7
A calibration system for a web inspection system used for monitoring a web of material, the calibration system comprising:
- at least one web sensor configured to receive signals indicative of a first characteristic of a first cross-web portion of the web of material, and provide first response signals representative of the first characteristic in a calibrated unit of measurement, said first cross-web portion being less than the width of the web of material;
- the web inspection system configured to receive signals indicative of the first characteristic from a second cross-web portion of the web of material and provide second response signals representative of the second cross-web portion;
- and,
- a sensor-to-inspection-system calibration module that converts the first response signals and second response signals to the frequency domain, and, for a first frequency range of interest, analyzes the frequency spectrum of the first and second response signals to provide a first frequency range correlation model which is then applied to the second response signals in the first frequency range to convert the second response signals in the first frequency range into the units of measurement of the first response signals.
1 more element
Dependencies are inferred from the claim text.