Coating Coverage Calibration for High-Speed Sheet Inspection
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Solution Overview
Problem
Existing methods for detecting the surface coverage of coatings on strip-shaped materials, such as forming oils on metal sheets, struggle to provide reliable, quantitative results when the composition of the coating is unknown, especially at high speeds and over long lengths.
Innovation Solution
A dual-measurement method system is employed, where a first measurement method rapidly scans the surface using electromagnetic radiation to detect intensity and a second measurement method, conducted at fewer locations, provides calibration for the surface coverage, allowing for quantitative determination of coating thickness or mass regardless of material composition changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single rapid scanning measurement method is used to monitor coating coverage at high speed, then productivity is improved, but measurement precision deteriorates when coating composition is unknown
Solution Approach 1:
The measurement task is divided into two segments: a first measurement method performs rapid scanning at all locations to maintain high productivity, while a second measurement method performs calibration measurements at selected locations to ensure measurement precision. This segmentation allows the system to achieve both high-speed monitoring and accurate quantitative results even when coating composition varies.
2Device complexity
If only one measurement method is used, then device complexity is reduced, but the system cannot simultaneously achieve high speed monitoring and accurate quantitative measurement
Solution Approach 1:
The measurement system is designed with multi-functionality by incorporating two measurement methods that serve different purposes. The first measurement method provides rapid scanning capability for high-speed monitoring, while the second measurement method provides calibration capability for quantitative accuracy. Together, they create a universal system that can handle both speed and precision requirements regardless of coating composition changes.
Solution Approach 2:
The system implements feedback by using the second measurement method to calibrate the first measurement method based on actual coating composition at selected locations. This feedback loop ensures that the rapid scanning measurements remain accurate even when coating composition varies, thereby improving measurement reliability without significantly increasing system complexity.
3Measurement precision
If calibration measurements are performed at all locations, then measurement precision is improved, but productivity decreases due to increased measurement time
Solution Approach 1:
Instead of performing calibration measurements uniformly at all locations, the system applies local quality by selecting specific locations for calibration measurements based on the coating application process characteristics. This approach ensures measurement precision where most needed while maintaining high productivity by avoiding unnecessary calibration measurements at all locations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate, high-speed monitoring of coating coverage across the entire surface, ensuring completeness and evenness of the coating, even when the coating composition varies, by calibrating the rapid scanning method with slower, more precise measurements at specific locations.
Implementation Method 1
measuring an intensity in each case of electromagnetic radiation reflected, backscattered or emitted by the coating
Implementation Method 2
measuring an intensity in each case of electromagnetic radiation reflected, backscattered or emitted by the coating
Implementation Method 3
The luminescence radiation then generated by the coating is recorded wavelength-resolved
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a method for detecting the surface coverage of a coating on the surface of a ribbon-shaped test specimen, comprising the steps of moving the ribbon-shaped test specimen in a feed direction and detecting a measure of the surface coverage of the coating line by line using a first measuring method, which includes the steps of illuminating the surface of the test specimen with electromagnetic radiation at a plurality of locations in a line extending substantially perpendicular to the feed direction, measuring the intensity of electromagnetic radiation reflected, backscattered or emitted by the coating at each location in the line using a detector, and determining a measure of the surface coverage of the coating at each location in the line from the intensity detected by the detector.To improve the procedure, it is proposed to design it in such a way that it additionally includes the steps of performing a calibration measurement at a location in the line using a second measurement method different from the first measurement method, wherein the second measurement method is designed to capture a measure of the surface coverage of the coating at that location in the line, and calibrating the measure of surface coverage of the coating determined by the first measurement method on the basis of the measure of surface coverage of the coating captured by the second measurement method.