Wearable UV Exposure Calibration Using Sun Orientation Correction
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Solution Overview
Problem
Existing UV light monitoring systems, including wearable devices, are inaccurate due to frequent changes in location and orientation relative to the sun, leading to inconsistent UV light detection and inadequate personalized exposure recommendations.
Innovation Solution
A wearable UV light sensor is calibrated by determining a corrective factor based on the device's position and orientation relative to the sun, using sensors like a UV light sensor, visible light sensor, orientation sensor, and location sensor, to provide accurate UV light intensity measurements, which are then used to generate personalized exposure recommendations considering environmental and physiological factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wearable UV light sensor is used to monitor ultraviolet light exposure, then real-time UV detection capability is provided, but measurement precision deteriorates due to frequent changes in device position and orientation relative to the sun
Solution Approach 1:
The system continuously monitors device orientation using an orientation sensor and location using a location sensor, then uses this feedback to dynamically calculate and apply corrective factors to the UV sensor readings. This closed-loop feedback mechanism compensates for position and orientation changes, maintaining measurement precision while preserving real-time detection capability
Solution Approach 2:
The system changes the parameters used for UV measurement by introducing corrective factors that are calculated based on device orientation angles and location data. Instead of using raw UV sensor readings directly, the system transforms these readings by applying parameters (corrective factors) that account for the device's spatial relationship to the sun, thereby maintaining accuracy despite position changes
2Device complexity
If standard UV light sensor readings are used without calibration, then device complexity is minimized, but measurement precision deteriorates due to lack of environmental and positional compensation
Solution Approach 1:
The wearable device integrates multiple sensors (UV sensor, orientation sensor, location sensor, visible light sensor) into a single multi-functional system. Each sensor serves its specific function, but collectively they work together to provide calibrated UV measurements that account for environmental and positional factors, achieving high precision without requiring a completely separate calibration device
Solution Approach 2:
The system introduces intermediate computational processing that acts as a mediator between the raw sensor readings and the final UV exposure assessment. Corrective factors serve as intermediaries that translate raw data from multiple sensors into calibrated UV measurements, bridging the gap between simple sensor readings and accurate environmental compensation
3Ease of operation
If UV light detection does not account for individual characteristics, then ease of operation is maximized, but the quality of exposure recommendations deteriorates due to lack of personalization
Solution Approach 1:
The system applies local quality by tailoring the UV exposure recommendations to each user's specific characteristics. Instead of providing generic advice, the system customizes recommendations based on individual skin type, location, time of day, and device orientation, ensuring that each user receives locally optimized guidance suited to their specific context and physiology
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 enables accurate detection of UV light intensity and personalized exposure recommendations, reducing the likelihood of negative health effects and maximizing health benefits by adjusting for environmental and user-specific factors.
Implementation Method 1
A wearable UV light sensor is calibrated by determining a corrective factor based on the device's position and orientation relative to the sun
Implementation Method 2
using sensors like a UV light sensor, visible light sensor, orientation sensor, and location sensor
Data Source
AI summary
A wearable device detects ambient ultraviolet light and provides output related to lengths of time for safe exposure and health benefits. Orientations of the device, determined by an orientation sensor, intensity of ambient light determined by ultraviolet and visible light sensors, or both are used to determine a current position of the sun or other source of ultraviolet light. Data from the sensors and position of the sun are used to select a gain level for the ultraviolet light sensor or a corrective factor to be applied to signals from the ultraviolet light sensor. At a subsequent time, detected intensity of ambient ultraviolet light may be used in combination with external data relating to the location of the device to determine an output, such as recommended times for exposure. Other sensors may determine physiological characteristics of the user, which may also be used to determine personalized recommended exposure times.