Illuminance Calibration Device for Mobile Sensor Consistency
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Solution Overview
Problem
Differences in light sensors and shading plates among mobile devices lead to significant variations in detected illuminance, necessitating methods and devices for calibrating and standardizing illuminance measurements across different devices.
Innovation Solution
An illuminance calibrating device comprising a reference light source and an illuminance detecting device with a shading plate, controller, and illuminance detector, which adjusts and calculates ratios of source illuminance to shading illuminance to determine the illuminance of a source-under-test, ensuring consistency and accuracy in measurements within a specified wavelength range (390 nm to 700 nm).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If different mobile devices use different light sensors and shading plates, then each device can be manufactured with available components, but the illuminance detection results vary significantly across devices
Solution Approach 1:
The patent applies parameter changes by introducing a calibration process that determines device-specific parameters (shading coefficients, sensor sensitivity factors) for each mobile device. These parameters are used to adjust and normalize illuminance measurements, transforming raw inconsistent readings into standardized values that can be compared across different devices while maintaining manufacturing flexibility
Solution Approach 2:
The patent implements feedback through a calibration mechanism where actual illuminance measurements are compared against reference values, and the difference is used to adjust calibration parameters. This feedback loop ensures that despite hardware variations, all devices converge to consistent measurement results by continuously refining their individual calibration characteristics
2Illumination intensity
If a shading plate is used to filter light, then the illuminance can be reduced to detectable levels, but the detection results differ due to variations in light transmittance among different shading plates
Solution Approach 1:
The patent addresses shading plate variations by determining a specific shading coefficient for each device through calibration. This parameter change compensates for differences in light transmittance among different shading plates, allowing the system to normalize measurements despite hardware variations in the shading components
Solution Approach 2:
The patent introduces a calibration parameter as an intermediary that mediates between the physical shading plate and the digital measurement. This intermediary parameter absorbs the variations in light transmittance, allowing the shading plate to perform its light-reducing function while the calibration parameter corrects for manufacturing tolerances and material variations
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 solution ensures consistent and accurate detection of illuminance across different mobile devices, improving the reliability of illuminance measurements and reducing discrepancies caused by varying light sensors and shading plates.
Implementation Method 1
The illuminance detector detects the first shading illuminance to generate a detection signal
Data Source
AI summary
An illuminance calibrating device includes a reference light source and an illuminance detection device. The reference light source, which generates light with a specific wavelength and a source illuminance, adjusts the source illuminance to be a first illuminance according to a control signal. The illuminance detection device includes a shading plate, an illuminance detector, and a controller. The shading plate is configured to lower the first illuminance to a first shading illuminance. The illuminance detector detects the first shading illuminance to generate a detection signal. The controller generates the control signal and calculates a ratio of the first illuminance to the first shading illuminance according to the detection signal.