Self-Adjusting Luminaire Sensor Failure Detection
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Solution Overview
Problem
Intrinsically safe and explosion-proof luminaires in hazardous environments face challenges with fixed light intensity settings, leading to energy wastage and potential distraction or danger due to sudden changes in ambient light, and they lack the ability to independently detect sensor malfunctions without external information.
Innovation Solution
A self-adjusting luminaire that continuously modifies its light intensity based on the difference between measured and setpoint light levels, gradually adjusting to avoid startling users and can detect sensor malfunctions using its own measurements, allowing for autonomous operation even without a functional network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed factory-configured light intensity is used, then device complexity is reduced, but energy efficiency deteriorates due to wastage when ambient light is present
Solution Approach 1:
The luminaire uses its own illumination sources to create ambient light that serves as feedback for the light sensor, enabling the system to self-regulate without external infrastructure. The sensor detects the luminaire's own light output and automatically adjusts dimming accordingly, making the system self-sufficient and energy-efficient.
Solution Approach 2:
A light sensor continuously monitors ambient light levels and provides feedback to the controller, which automatically adjusts the illumination sources to maintain optimal lighting while minimizing energy consumption. The system responds dynamically to changing light conditions without requiring complex manual control.
2Loss of energy
If ambient light harvesting is implemented, then energy efficiency is improved, but user safety deteriorates due to sudden light changes that may startle or distract users
Solution Approach 1:
The system dynamically adjusts light intensity based on real-time sensor feedback, smoothly transitioning between different illumination levels rather than making abrupt changes. This dynamic control adapts to ambient conditions while maintaining user comfort and safety through gradual adjustments.
Solution Approach 2:
The controller modifies operational parameters (light intensity) based on sensor readings, changing the illumination level progressively rather than abruptly. This parameter adjustment strategy maintains energy efficiency while preventing sudden light changes that could startle or distract users in hazardous environments.
3Loss of energy
If external light sensors are used for ambient light harvesting, then energy efficiency is improved, but reliability deteriorates due to inability to detect sensor failures without external information
Solution Approach 1:
The luminaire uses its own illumination sources as the ambient light source for sensor detection, creating a self-contained system that can independently verify sensor functionality. The sensor monitors the luminaire's own light output, enabling the system to self-diagnose sensor failures without external reference sources or network connectivity.
Solution Approach 2:
Instead of using external sensors to detect external ambient light, the system inverts the approach by using the luminaire's own internal light sources as the ambient light source for sensor monitoring. This inversion enables the sensor to validate its own functionality by detecting the known light output from the luminaire's illumination sources.
4Device complexity
If network-dependent sensor monitoring is used, then device complexity is reduced, but productivity deteriorates due to inability to operate autonomously during network outages
Solution Approach 1:
The luminaire performs self-monitoring and self-diagnosis using its own illumination sources and light sensor, eliminating dependence on external networks or centralized monitoring systems. The system autonomously detects sensor failures and continues operation, ensuring uninterrupted productivity in hazardous environments where network connectivity may be unreliable.
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 energy efficiency, minimizes user distraction, and maintains reliable lighting by adjusting intensity smoothly and detecting sensor errors without external input, ensuring safe and effective operation in hazardous environments.
Implementation Method 1
one or more light sensors positioned at different locations within the same environment measure amounts of light in the environment
Data Source
AI summary
A self-adjusting luminaire whose primary operation is to provide ambient or focused lighting in a hazardous environment is configured to modify (e.g., continuously) the energization intensity levels of its on-board illumination sources based on magnitudes of difference between an amount of light in the environment of the luminaire (e.g., including both light produced by the luminaire and ambient light) as measured by on-board sensors and a setpoint amount of light corresponding to the luminaire. Further, the self-adjusting luminaire may detect that its on-board sensors are malfunctioning when the illumination sensors fail to sense a change in the amount of light in the environment of the luminaire after the luminaire has modified the energization intensity levels of its illumination sources. Upon detecting a sensor malfunction, the self-adjusting luminaire may generate an alarm, and/or may automatically modify the intensity of its illumination sources to mitigate effects of the detected malfunction.