Luminance Calibration with Multichannel Sensing for Drift Correction
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Solution Overview
Problem
Existing calibration methods fail to address the challenge of drift over time, which creates uncertainty in the calibration of light measurement devices, and existing methods are not effective in the calibration of light measurement devices. The calibration of light measurement devices are not effective in the calibration of light measurement devices, and the light source drifts during its lifespan, creating additional uncertainty in the calibration of light measurement devices. The total uncertainty in calibration measurements is quantified higher than 1%-1.5%.
Innovation Solution
A luminance calibration device comprising a light source, a light scattering structure, and a multichannel optical sensor capable of capturing luminance at multiple wavelengths, with a processing unit to determine deviations and adjust spectral power distribution, thereby reducing uncertainty in calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a Halogen lamp is used as a transfer light source, then the device can provide broad spectrum light for calibration, but the luminance and colorpoint drift over time creating measurement uncertainty
Solution Approach 1:
The patent implements a feedback mechanism where a reference detector continuously monitors the spectral power distribution of the light source. When drift is detected, the system generates correction factors that are applied to subsequent measurements, automatically compensating for the drift and maintaining measurement accuracy over time
Solution Approach 2:
The system dynamically adjusts measurement parameters based on detected drift. By continuously monitoring the spectral characteristics and applying correction factors, the system adapts to changes in the light source's luminance and colorpoint, effectively compensating for parameter changes that would otherwise create measurement uncertainty
2Measurement precision
If calibration measurements are performed over several hours, then comprehensive calibration data can be collected, but the light source drifts during measurement creating additional uncertainty
Solution Approach 1:
The system performs preliminary characterization of the light source's drift behavior during calibration. By measuring and storing the spectral power distribution at multiple time points, the system establishes a drift profile that can be used to correct measurements taken at any point during the calibration process, effectively compensating for time-related drift
Solution Approach 2:
The reference detector continuously monitors the light source characteristics throughout the calibration process, providing real-time feedback on drift. This enables the system to apply appropriate correction factors to each measurement based on the actual drift conditions at that moment, maintaining precision despite extended measurement duration
3Measurement precision
If a multichannel optical sensor with at least 10 different wavelength channels is used, then color sensitivity is sufficient for high end measurement device calibration, but the device complexity increases
Solution Approach 1:
The patent divides the spectral measurement task into multiple discrete wavelength channels, with each channel detecting a specific wavelength range. This segmentation allows the system to achieve high color sensitivity by measuring multiple spectral components independently, while keeping each individual detector channel relatively simple in design
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
The luminance calibration device reduces uncertainty in calibration measurements by using a multichannel optical sensor to detect deviations and adjust spectral power distribution, ensuring accurate calibration of light measurement devices.
Implementation Method 1
a light scattering structure for scattering the light of the light source
Implementation Method 2
The at least one multichannel optical sensor is adapted to capture the luminance at at least 10 different wavelengths comprised in the light emitted by the light source and scattered by the light scattering structure
Data Source
AI summary
A luminance calibration device comprises a light source and a light scattering structure for scattering the light of the light source and having a light outlet port. In use a light measurement device to be calibrated can be positioned to capture light from the light outlet port. At least one multichannel optical sensor is associated with the light scattering structure. The multichannel optical sensor is adapted to capture the luminance at least ten different wavelengths comprised in the light emitted by the light source and scattered by the light scattering structure.