Electrode Sheet Measurement Smoothing for Stable Basis Weight Profiles
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Solution Overview
Problem
Existing measurement systems struggle to improve the accuracy of thickness and basis weight measurements in electrode sheets due to noise from sensor characteristics, leading to unstable standard deviation and range values until sufficient data is accumulated, making it difficult to maintain consistent product quality and requiring costly hardware changes or software adjustments.
Innovation Solution
A measurement apparatus and method that perform smoothing on detection values using a predetermined filter in the width direction perpendicular to the conveyance direction of the electrode sheet, applying filters like moving average, median, or Gaussian filters to stabilize measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional smoothing is performed on detection values, then measurement data is processed, but measurement accuracy cannot be improved because standard deviation and range values do not decrease until sufficient data is accumulated
Solution Approach 1:
The patent applies smoothing in the width direction (perpendicular to conveyance direction) in addition to the conventional conveyance direction smoothing. This two-dimensional smoothing approach processes detection values across both spatial dimensions, reducing standard deviation and range values without requiring extensive data accumulation over time, thereby improving measurement accuracy while minimizing data accumulation time.
2Measurement precision
If smoothing is performed using conventional methods, then noise is reduced, but measurement accuracy improvement is limited because values indicating data variation do not decrease sufficiently
Solution Approach 1:
By introducing smoothing in the width direction perpendicular to the conveyance direction, the patent creates a two-dimensional smoothing framework. This additional dimensional processing reduces data variation more effectively, causing standard deviation and range values to decrease to appropriate levels, thereby simultaneously improving measurement accuracy and ensuring reliability of measurement results.
Solution Approach 2:
The patent combines smoothing operations in both the conveyance direction and the width direction into a unified processing system. This merged approach integrates multiple smoothing dimensions to achieve superior noise reduction and measurement stability compared to single-direction smoothing methods.
3Measurement precision
If detection devices are used to measure thickness and basis weight, then coating amount can be calculated, but noise from sensor characteristics degrades measurement quality requiring costly hardware changes
Solution Approach 1:
The patent replaces hardware-based noise reduction solutions with a software-based two-dimensional smoothing algorithm. Instead of modifying detection devices or sensors to reduce noise, the system processes detection values through smoothing operations in both conveyance and width directions, effectively reducing sensor noise impact without requiring costly hardware changes.
Solution Approach 2:
The patent introduces a computational intermediary layer (smoothing algorithm) between the detection device and the measurement results. This intermediary processes the noisy detection values through two-dimensional smoothing, acting as a mediator that reduces sensor noise impact and improves measurement quality without modifying the original detection hardware.
Data Source
AI summary
A measurement apparatus includes a processor configured to collect, from a detection device, a detection profile including a plurality of detection values related to a thickness or a basis weight of a measurement object that is to be conveyed and that is in a form of a sheet, and perform smoothing, by using a predetermined filter, on the plurality of detection values included in the detection profile in a width direction that is perpendicular to a conveyance direction of the measurement object, and that outputs a first smoothing profile.