Interference Pigment Identification via Angle-Dependent Spectral Analysis
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Solution Overview
Problem
Existing methods fail to accurately identify individual interference pigments in coatings due to their angle-dependent reflection spectra, which complicates precise color coordination and formulation in coatings.
Innovation Solution
A method involving varying illumination angles while maintaining a consistent aspecular observation angle, combined with spatial and spectral analysis of images, allows for the identification of interference pigments by capturing characteristic spectral variations specific to each type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If interference pigments are used in coatings to generate color effects, then the color coordination and design enhancement are improved, but the identification of individual pigment types becomes difficult due to angle-dependent reflection spectra
Solution Approach 1:
The patent changes the illumination angle parameter to capture multiple images of the coating at different angles. By varying the illumination angle and capturing images at corresponding aspecular angles, the method exploits the angle-dependent reflection characteristics of interference pigments to identify pigment types. This parameter change transforms the identification problem from a single-angle measurement to a multi-angle analysis, enabling precise pigment identification despite the angle-dependency issue.
2Ease of manufacture
If interference pigments are used to create distinctive color effects, then the design enhancement and attractiveness are improved, but the reflection spectrum becomes highly angle-dependent, preventing explicit identification by individual pictures
Solution Approach 1:
The patent adds the angular dimension to the measurement process by capturing images at multiple illumination angles and corresponding aspecular observation angles. This transforms the detection from a two-dimensional spatial analysis to a three-dimensional analysis that includes angular variation. By incorporating the angular dimension, the method can distinguish interference pigments from other pigments and identify specific pigment types based on their characteristic angle-dependent reflection patterns.
3Measurement precision
If multiple images at different illumination angles are captured to identify interference pigments, then the identification precision is improved, but the measurement process complexity increases
Solution Approach 1:
The patent employs feedback by using the captured images at different illumination angles to iteratively identify and characterize interference pigments. The system captures images, analyzes the angle-dependent reflection patterns, identifies pigment types, and can adjust subsequent measurements based on the identification results. This feedback mechanism enables precise identification of interference pigments while managing the complexity of the multi-angle measurement process through systematic data processing and analysis.
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 precise identification of individual interference pigments, improving color coordination and formulation accuracy by utilizing the angle-dependent spectral changes as a new measured variable.
Implementation Method 1
a reflection spectrum of an interference pigment that is present in a finely distributed manner in a paint or coating based on a paint generally has most certainly a dependence on the illumination angle at which the light falls on the surface
Implementation Method 2
the corrected first aspecular measurement angle is obtained from the first aspecular measurement angle by correction in accordance with an optical refraction of the light that has changed at the at least one second illumination angle
Implementation Method 3
recording a first image of the coating applied to the surface at a first aspecular measurement angle or observation angle, measured in relation to the Bragg angle or specular angle
Data Source
AI summary
Described herein is a method for identifying an interference pigment in a coating. Also described herein is a corresponding device and a computer-readable medium.