Color Measurement Device Distance Angle Correction
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Solution Overview
Problem
Current color measurement devices, such as spectrophotometers, face challenges in achieving distance and angle independence, leading to measurement values that are substrate-dependent and not directly comparable across different materials, due to variations in the scanning surface and object thickness.
Innovation Solution
A color measurement device with a control system that uses stored white calibration data to correct measurement values based on varying distances and angles, incorporating additional calibration steps to determine and store data for different positions, and utilizing secondary measurement channels for distance determination without additional optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If relative measurement is used to eliminate distance variations caused by different substrate thicknesses, then measurement independence from distance is improved, but measurement comparability across different substrate materials deteriorates
Solution Approach 1:
The patent applies parameter changes by storing multiple sets of white calibration data corresponding to different distance and angle parameters. Instead of using a single calibration set, the system selects and applies the appropriate calibration data based on the actual measurement conditions, thereby maintaining measurement accuracy across varying distances and angles while preserving comparability across different substrate materials.
2Ease of operation
If contact-free scanning is used for measurement, then ease of operation is improved, but measurement precision deteriorates due to distance variations
Solution Approach 1:
The patent applies preliminary action by pre-calibrating the measurement device at multiple different distances and angles before actual measurement. During operation, the system determines the current distance and angle, then selects the pre-prepared calibration data that matches these conditions. This eliminates the need for complex real-time adjustments during contact-free scanning while maintaining measurement precision.
3Measurement precision
If additional optical components are added for distance determination, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by utilizing measurement signals that are already generated by the color measurement channel during normal color measurement operations. Instead of adding separate optical components for distance determination, the system processes the existing measurement signals to extract distance and angle information, thereby achieving precise distance determination without increasing device complexity.
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 ensures distance and angle-independent measurement results, enhancing precision and universality, allowing for accurate color measurements across various substrates and improving inter-instrument precision by compensating for illumination losses at non-nominal distances/angles.
Implementation Method 1
a colour measurement device, especially a spectrophotometer (3), for photoelectric scanning of a measurement object (4)
Data Source
AI summary
A color measurement device includes a color measurement channel (20,30) and a control (C), which forms color measurement values from the measurement signals of the color measurement channel and from stored white calibration data. It further includes correction means in order to calculate or correct the color measurement values depending on different distances (a) and/or angles (α) to the measurement object. Because of the special measurement value correction, the color measurement device is especially suited for contactless measurement applications with variable distances and angle orientations relative to the measurement object.