Spatially Resolved Surface Optical Property Evaluation
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Solution Overview
Problem
Existing methods for examining surface properties, such as those on motor vehicle bodies with pigments or flakes, fail to provide spatial resolution and standardized parameters for color characterization, leading to varying color impressions due to distribution, orientation, and observation angles.
Innovation Solution
A method involving predefined radiation directed at a surface at a specific solid angle, with detection at another angle to capture spatially resolved radiation properties, allowing for the determination of statistical parameters that characterize surface properties like spectral reflectance and transmission, and conversion to standardized color coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior art methods are used to examine surface properties, then the examination process is simple, but spatial resolution and standardized color parameters are not provided, leading to varying color impressions
Solution Approach 1:
The detection process is segmented into multiple spatially resolved detection points across the surface. Instead of integrating light from the entire surface, the method divides the measurement into discrete locations, capturing reflectance values at each point to enable spatial analysis of pigment distribution and orientation effects
Solution Approach 2:
The method transitions from one-dimensional integrated intensity measurement to two-dimensional spatially resolved measurement by adding angular dimension (observation angle) and spatial position dimension. This allows characterization of how surface properties vary across different locations and angles, providing standardized color parameters at each spatial point
2Loss of information
If integrated intensity detection is used, then the device is simple, but information about location-specific surface properties and pigment distribution is lost
Solution Approach 1:
The method implements feedback by comparing measured reflectance values at different spatial locations and angles against reference values or expected patterns. This feedback mechanism enables identification of pigment distribution anomalies, orientation effects, and deviations from standardized color specifications, providing actionable quality control information
Solution Approach 2:
The system measures and analyzes multiple parameters including spectral reflectance, spatial position, and observation angle simultaneously. By changing and analyzing these parameters across the surface, the method extracts detailed information about pigment properties, distribution density, and orientation without requiring complex physical modification of the surface
3Measurement precision
If surfaces with effect pigments are examined without spatial resolution, then measurement is straightforward, but color gradients and flop effects cannot be detected
Solution Approach 1:
The method dynamically adjusts measurement angles and spatial positions to capture the varying optical properties of effect pigments. By systematically varying observation angles and measuring at multiple locations, the system characterizes dynamic effects such as color flop and iridescence that change with viewing geometry, enabling comprehensive quality assessment
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 characterization and comparison of surfaces with varying optical impressions by providing feedback in common color theory parameters, accurately representing color and lightness variations across different locations and angles.
Implementation Method 1
light is directed at the examined surface and the light reflected or diffused off the surface is detected
Implementation Method 2
light is directed at the examined surface and the light reflected or diffused off the surface is detected
Implementation Method 3
radiation affected by the examined surface in any one of its properties, in particular by physical effects such as reflection, diffusion, diffraction, absorption
Data Source
AI summary
A method and a device for a spatially resolved examination and evaluation of the properties of surfaces, in particular such properties of surfaces which affect the optical impression which the surface makes. A defined radiation is directed at a first predetermined solid angle to an examined surface. Furthermore, at least a portion of the radiation affected by the examined surface in particular by diffusion and reflection, is detected at a second predefined solid angle. At least one measured variable is spatially resolved captured which characterizes at least one predetermined property of the radiation affected by the examined surface. At least over a portion of the spatially resolved measured values at least one statistical parameter for characterizing the surface is determined.