Light Sensor Calibration via Adjustable Light Source and Gain Matching
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Solution Overview
Problem
Existing light sensing devices face challenges in accurately measuring light intensity due to varying light sources and spectral distributions, and their calibration is often inaccurate or not tailored to individual user conditions, leading to poor measurement reliability.
Innovation Solution
A light sensing system with a calibration device that uses adjustable light sources and sensors to match output intensity signals with expected values, allowing users to customize calibration for specific light conditions and spectral ranges, and incorporates temperature sensing for accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If devices are pre-calibrated by the manufacturer for a specific range, then manufacturing complexity is reduced, but measurement precision deteriorates under varying light conditions
Solution Approach 1:
The system performs preliminary calibration actions by storing multiple calibration values corresponding to different light intensity ranges. Before actual measurement, the system determines which calibration range applies and selects the appropriate calibration values, effectively preparing the measurement system in advance for different operating conditions without requiring complex real-time adjustments.
Solution Approach 2:
The system dynamically switches between different calibration values based on the detected light intensity range. Instead of using a fixed pre-calibrated value, the system adapts its calibration parameters in real-time according to the ambient light conditions, thereby maintaining high measurement precision across varying light environments while keeping the manufacturing process relatively simple.
2Device complexity
If a single calibration value is used for all conditions, then device complexity is reduced, but reliability deteriorates under diverse light sources
Solution Approach 1:
The calibration system is segmented into multiple calibration values, each corresponding to a specific light intensity range or light source type. This segmentation allows the system to handle different lighting conditions with specialized calibration parameters, improving reliability without requiring an overly complex unified calibration mechanism. Each segment can be independently optimized for its specific condition.
Solution Approach 2:
The calibration system achieves multi-functionality by using a set of calibration values that can serve different light sources and intensity ranges. Instead of designing separate calibration systems for each condition, the universal calibration structure selects from multiple values based on the detected conditions, providing reliable measurements across diverse scenarios while maintaining a unified system architecture.
3Measurement precision
If calibration is performed for specific light sources, then measurement precision improves for those sources, but adaptability deteriorates to other light sources
Solution Approach 1:
The system dynamically adapts its calibration parameters based on the detected light source characteristics. By monitoring the light source type and intensity, the system automatically selects or adjusts the appropriate calibration values from its stored set, maintaining high precision for the current light source while being adaptable to various other light sources through this dynamic selection mechanism.
Solution Approach 2:
The system changes its calibration parameters based on the detected light source conditions. Different calibration values are associated with different light source types and intensity ranges, allowing the system to optimize its measurement precision for each specific condition while maintaining versatility across multiple light sources through parameter adjustment rather than structural modification.
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 system provides enhanced long-term precision and reliability in light measurements across diverse light sources and conditions, ensuring accurate data for circadian rhythm synchronization and mood disorder diagnosis.
Implementation Method 1
at least one light sensor providing an output intensity signal corresponding to a measured light intensity
Data Source
AI summary
The present invention relates to a light sensing system for sensing ambient light intensity, comprising a light sensing device with at least one light sensor and a calibration device for calibrating the sensor. The calibration device comprises at least one light source that emits light with a standard intensity. The invention is further related to a corresponding method for calibrating a light sensing device, comprising the illumination of the light sensor of the light sensing device with light that has a standard intensity, the comparison of the output intensity signal of the sensor with an expected signal that corresponds to the standard intensity, and the matching of the output intensity signal of the sensor to the expected signal by adjusting a gain parameter of the sensor.