Unstabilized Sheet Measurement via Biased Sensor Data Compensation
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Solution Overview
Problem
Existing measurement systems for unstabilized moving sheets face challenges in accurately measuring properties due to geometric variations, as they often require stabilization that can introduce errors, friction, or instability, limiting the range of valid measurements.
Innovation Solution
The method involves receiving multiple biased measurements associated with different sheet geometries and determining an unbiased measurement corresponding to a nominal geometry, allowing for accurate property measurement without stabilization, using sensors and geometry sensors to measure and adjust for geometric variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contacting solutions are used to stabilize the sheet, then measurement stability is improved, but friction is introduced causing markings and sheet breaks
Solution Approach 1:
The patent replaces mechanical contacting stabilization systems with an optical measurement system that uses multiple sensors positioned at different locations to capture sheet properties. The system processes these measurements computationally to compensate for geometric variations, eliminating physical contact and associated friction while maintaining measurement stability.
Solution Approach 2:
The patent introduces computational processing as an intermediary between the sheet and measurement sensors. By using multiple sensors to capture biased measurements from different geometries and then processing these measurements to determine unbiased values, the system compensates for geometric variations without requiring physical stabilization of the sheet.
2Shape
If aerodynamic devices are used to stabilize the sheet, then sheet position is improved, but measurement robustness deteriorates due to instability with tension variations
Solution Approach 1:
The patent adopts a dynamic measurement approach that accommodates varying sheet tensions and positions. Instead of attempting to rigidly stabilize the sheet, the system uses multiple sensors positioned at different locations and processes the biased measurements they capture to determine accurate unbiased measurements, making the measurement process robust to tension variations.
Solution Approach 2:
The patent changes the measurement parameters by using multiple sensors at different positions and processing their measurements computationally. This approach transforms the problem from trying to maintain fixed geometric parameters to accepting parameter variations and compensating for them through measurement processing, thereby improving robustness.
3Measurement precision
If multiple sensors are used to measure sheet properties, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes the measurement system multi-functional by using the same multiple sensors to both capture sheet property measurements and characterize geometric variations. This universal approach allows the system to extract multiple types of information from the same sensor array, improving measurement accuracy without proportionally increasing complexity.
Solution Approach 2:
The patent merges the measurement of sheet properties with the characterization of sheet geometry by using the same sensor array for both purposes. The biased measurements captured by multiple sensors contain information about both sheet properties and geometric variations, and processing these combined measurements yields accurate unbiased results.
Data Source
AI summary
A method includes receiving multiple biased measurements associated with a property of a sheet of material, where the biased measurements correspond to multiple known sheet geometries. The method also includes determining an unbiased measurement associated with the property of the sheet using the biased measurements, where the unbiased measurement corresponds to a nominal sheet geometry. The method further includes storing and/or outputting the unbiased measurement. Determining the unbiased measurement could include performing regression using the biased measurements and their corresponding sheet geometries to identify an estimated value of the property of the sheet at the nominal sheet geometry. The biased measurements can be generated using one or more sensors, and the sheet may not be stabilized during the biased measurement generation. Additional sheet geometries can also be created, such as by varying a tilt angle, a curvature, and/or a position of the sheet.