Electrode Sheet Thickness Measurement with 2D Smoothing Filters

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Solution Overview

Problem

Existing measurement technologies for the thickness and basis weight of electrode sheets struggle with low accuracy due to noise in sensor data, leading to unstable standard deviation and range values until sufficient data is accumulated, and are inflexible in handling different materials and radiation sources.

Innovation Solution

A measurement apparatus and method that includes a collection unit to gather detection profiles and performs smoothing using filters in both the width and conveyance directions of the electrode sheet, allowing for improved accuracy and adaptability without hardware changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional smoothing is performed on detection data, then measurement process is simple, but measurement accuracy of thickness or basis weight does not improve sufficiently

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidsmoothing process complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies smoothing processing in two dimensions: the conveyance direction (time series) and the width direction (cross-sectional position). By extending the smoothing operation from one dimension to two dimensions, the measurement accuracy improves significantly while maintaining a manageable process complexity through systematic application of filtering operations.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If sufficient data is accumulated to improve measurement accuracy, then stability of standard deviation and range values improves, but measurement time and productivity decrease

Engineering Contradiction:

Improvestability of measurement valuesVSAvoidmeasurement speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent performs smoothing processing on detection data in advance, before final measurement results are calculated. By pre-processing the data with two-dimensional smoothing (conveyance direction and width direction), the measurement system achieves stable and reliable results with fewer data points, thereby improving productivity without sacrificing measurement reliability.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If measurement system is designed for specific materials and radiation sources, then measurement accuracy for targeted applications is high, but adaptability to different materials and sources is poor

Engineering Contradiction:

Improvecompatibility with different materials and radiation sourcesVSAvoidmeasurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent employs a universal smoothing algorithm that can be applied regardless of the specific material being measured or the radiation source used. The two-dimensional smoothing approach (in conveyance and width directions) provides a general-purpose data processing method that maintains measurement accuracy across different application scenarios, thereby achieving both versatility and precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4657017A1Measurement apparatus, measurement method, and measurement program

Publication Date: 2025.12.03 YOKOGAWA ELECTRIC CORP

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AI summary

A measurement device (10) collects, from a detection device (20), a detection profile including a plurality of detection values related to a thickness or a basis weight of an electrode sheet (S) that is to be conveyed, performs smoothing, by using a smoothing filter, on the plurality of detection values included in the detection profile in a CD direction that is perpendicular to a MD direction of the electrode sheet S, and outputs a first smoothing profile.