Built-in Motion Sensor Illumination Detection Using Dual-Spectrum Segmentation
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Solution Overview
Problem
Built-in photoelectric sensors in lamps struggle to accurately detect natural light levels due to interference from artificial light, leading to inefficient energy use and design issues when trying to integrate sensors within the lamp.
Innovation Solution
A dual-tech method using visible and invisible light detection modules, with specific spectral bands (400-700 nm and 700-1050 nm) to isolate natural light levels, allowing for accurate control of lamp brightness and turn-off thresholds, and a built-in sensor system that includes modules for real-time movement detection and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a photoelectric sensor is built-in in the lamp, then the intelligent control function is added and the appearance is maintained, but the sensor cannot detect natural light accurately due to interference from artificial light
Solution Approach 1:
The detection spectrum is segmented into visible light band (400-700nm) and invisible light band (700-1050nm). The visible light detection module detects visible spectrum while the invisible light detection module detects infrared spectrum, allowing the system to distinguish between natural light (strong in visible, weak in infrared) and artificial light (strong in infrared). This spectral segmentation enables accurate natural light detection despite the presence of artificial light interference.
Solution Approach 2:
The invisible light detection module acts as an intermediary to detect the artificial light component separately. By measuring the infrared radiation from the lamp and subtracting this from the total detected light, the system can isolate and accurately measure the natural light component, solving the interference problem.
2Ease of manufacture
If the sensor is built-in in the lamp, then the wiring cost and installation difficulty are reduced, but the lamp's own light interferes with the sensor detection
Solution Approach 1:
The solution segments the light spectrum into visible and invisible bands, with dedicated detection modules for each. This allows the built-in sensor to differentiate between the lamp's artificial infrared emission and external natural light, enabling accurate environmental illumination detection while maintaining the convenient built-in configuration.
Solution Approach 2:
The system changes the detection parameter from single-spectrum detection to dual-spectrum detection. By monitoring both visible light intensity and infrared radiation levels, and using the ratio or difference between these parameters, the system can eliminate the interference effect of the lamp's own light and accurately measure environmental illumination.
3Productivity
If the lamp is controlled to turn on at low lux levels, then the lamp provides lighting when needed, but the lamp will not turn off even when external natural light is bright due to inaccurate detection
Solution Approach 1:
The system implements feedback control by continuously monitoring both visible and invisible light levels, comparing the calculated environmental illumination against preset thresholds, and automatically adjusting the lamp state. This accurate feedback mechanism ensures the lamp turns off promptly when natural light exceeds the threshold, preventing energy waste while ensuring lighting is provided when needed.
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
Enables precise control of lamp operation based on natural light levels, reducing energy waste and maintaining the lamp's appearance without separate wiring, achieving efficient and stable intelligent lighting control.
Implementation Method 1
Obtaining the environmental lux level on visible light band through a visible light detection module
Implementation Method 2
obtaining the environmental lux level on invisible light band through an invisible light detection module
Data Source
AI summary
A method for detecting environmental illumination and a fixture built-in motion sensor thereof, comprising: obtaining the environmental lux level on visible light band through a visible light detection module and the environmental lux level on invisible light band through an invisible light detection module; the lamp is turned on when said environmental lux level of visible light is lower than the preset lux level; obtaining the mixed lux level of the lamplight and the natural light on visible light band and obtaining the mixed lux level of the lamplight and the natural light on invisible light band; calculating the turn-off threshold value for turning off the lamp through the environmental lux level and the mixed lux level. The illumination of natural spectrum is detected accurately without being interfered by the illumination of the artificial spectrum emitted by the lamp itself, thus the lamp can be controlled accurately and stably.