Spectral Surface Inspection for Motor Vehicle Lacquer
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Solution Overview
Problem
Existing methods for inspecting the surface properties of motor vehicles with complex coatings, particularly those containing effect pigments, are limited in their ability to provide comprehensive and accurate assessments, as they do not effectively account for the directional and spectral dependencies of optical impressions.
Innovation Solution
An apparatus with multiple illumination devices positioned at different angles and a radiation analysis device that performs spectrally resolved measurements to capture the scattered and reflected radiation, allowing for a comprehensive evaluation of surface properties by integrating radiation intensity over various wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-angle color measurement is performed to obtain comprehensive surface information, then measurement precision is improved, but device complexity increases due to multiple illumination devices and sensors required
Solution Approach 1:
The radiation analysis device performs multiple functions: it analyzes scattered radiation from the first illumination device, records radiation from the second illumination device, and integrates spectral components to obtain intensity values. This multi-functional approach reduces the need for separate dedicated devices for each measurement task.
Solution Approach 2:
The patent combines multiple illumination devices (first illumination device and second illumination device) with a single radiation analysis device that can handle both direct and scattered radiation measurements. This merging of measurement functions into a unified system reduces overall device complexity while maintaining comprehensive measurement capabilities.
2Measurement precision
If spectrally resolved gloss measurement is used to separate basecoat color influence from clearcoat gloss, then measurement precision is improved, but device complexity increases due to spectral analysis requirements
Solution Approach 1:
The radiation analysis device performs spectral analysis by resolving radiation into its wavelength components and integrating them to obtain intensity values. This parameter transformation from spectral domain to intensity domain enables separation of basecoat color influence from clearcoat gloss characteristics, improving measurement precision without requiring entirely separate measurement systems.
3Device complexity
If classic non-spectrally resolved gloss measurement is used with standard light and v-lambda filtering, then device complexity is reduced, but measurement precision deteriorates due to inability to separate color and gloss effects
Solution Approach 1:
The measurement system segments the radiation into different components: direct radiation from the first illumination device and scattered radiation from the second illumination device. The radiation analysis device further segments the spectral content to separate color information from gloss information, enabling precise differentiation of surface properties that classic integrated methods cannot achieve.
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
This approach enables more detailed evaluation of surface properties, including gloss behavior, by decoupling the influence of basecoat color on clearcoat gloss measurements, providing a more extensive and accurate assessment compared to classic non-spectrally resolved methods.
Implementation Method 1
a first illumination device (2, 6, 8) which illuminates a surface (10) to be examined at a first illumination angle (a1)
Implementation Method 2
a second illumination device (12) which illuminates the surface (10) at a second illumination angle (a2)
Implementation Method 3
a sensor device (4) which records reflected and/or scattered radiation from the surface (10)
Implementation Method 4
a sensor device (4) which records reflected and/or scattered radiation from the surface (10)
Implementation Method 5
a radiation analysis device (14) which analyzes radiation scattered and/or reflected by the surface (10) with regard to its wavelength
Data Source
AI summary
An apparatus for examining surface properties of lacquered surfaces, in particular of motor vehicles, having a first illumination device which illuminates a surface to be examined at a first illumination angle, having a second illumination device which illuminates the surface at a second illumination angle, having a first sensor device which records radiation reflected and/or scattered by the surface illuminated by the second illumination device at a first recording angle and outputs at least one value which is characteristic of the radiation reaching the sensor device from the surface, wherein the apparatus has a radiation analysis device which analyses radiation scattered and/or reflected by the surface with regard to its wavelength.