Color Measuring Apparatus Angular Error Compensation
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Solution Overview
Problem
Color measuring apparatuses face measurement errors due to angular dependencies and misalignment issues when dealing with metallic colors and varnishes containing effect pigments, leading to systematic and angular errors.
Innovation Solution
The apparatus is enhanced by dividing the illumination and pick-up assemblies into subassemblies that illuminate and observe from multiple directions near the nominal directions, with angular offsets of up to 4°-8°, allowing for compensation of measurement errors through weighted mixing of results from these subassemblies, and using electronic controls to adjust activation durations for accurate data capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single illumination assembly is used to illuminate the measurement spot from a preset nominal illumination direction, then the device complexity is low, but angular errors occur due to misalignment and the measurement precision deteriorates
Solution Approach 1:
The illumination assembly is divided into multiple illumination subassemblies (at least two), each illuminating the measurement spot from a different illumination sub-direction near the nominal illumination direction. This segmentation allows the system to capture angular dependencies and compensate for misalignment errors, thereby improving measurement precision while managing device complexity through modular design.
2Measurement precision
If multiple illumination subassemblies are used to illuminate from different sub-directions near the nominal direction, then angular errors are compensated and measurement precision improves, but the device complexity increases
Solution Approach 1:
The measurement results from multiple illumination subassemblies are merged through weighted mixing to compensate for angular errors. By combining the results with appropriate weighting factors, the system achieves error compensation and improved measurement precision without requiring each individual subassembly to be perfectly aligned, thus managing the increased device complexity effectively.
3Reliability
If the illumination assembly is divided into multiple subassemblies with different illumination sub-directions, then systematic errors and angular errors are reduced, but the ease of manufacture decreases
Solution Approach 1:
The system uses parameter changes in the form of different illumination sub-directions for each subassembly. By varying the illumination angles within a controlled range near the nominal direction, the system achieves error compensation and improved reliability. The electronic control adjusts activation durations and weighting factors to optimize measurements, making the system more reliable while managing manufacturing complexity through standardized modular components.
4Measurement precision
If electronic controls are used to adjust activation durations of illumination subassemblies, then measurement accuracy improves through weighted mixing of results, but the device complexity increases
Solution Approach 1:
The electronic control enables dynamic adjustment of the activation durations of individual illumination subassemblies. This dynamic control allows the system to optimize the weighting of measurements from different sub-directions in real-time, improving measurement accuracy by adapting to specific sample characteristics and error conditions, while managing device complexity through software-based control algorithms.
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 effectively corrects angular errors, ensuring accurate measurement results by aligning illumination and observation directions precisely and reducing measurement corruption, particularly for samples with effect colors.
Implementation Method 1
at least one illumination assembly for applying preferably substantially parallel illumination light to a measurement spot
Implementation Method 2
a pick-up assembly for capturing the measurement light radiated back from the measurement spot and for converting the same into corresponding electrical signals
Data Source
AI summary
A color measuring apparatus includes a measurement assembly which includes at least one illumination assembly for applying substantially parallel illumination light to a measurement spot of a measurement object and a pick-up assembly for capturing the measurement light radiated back from the measurement spot in an observation direction and for converting the same into corresponding electrical signals. The illumination assembly includes at least two illumination subassemblies which illuminate the measurement spot from different illumination sub-directions near a first preset nominal illumination direction, each with preferably parallel illumination light. By the illumination from different illumination sub-directions slightly deviating from the nominal illumination direction, angular errors of the illumination assembly can be compensated for in a simple manner.