Adaptive Human Presence Detection Using Visible and Infrared Sensing
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Solution Overview
Problem
Conventional visible light detection devices struggle to detect human presence effectively in low-light conditions due to decreased sensitivity.
Innovation Solution
A detection system and method that adaptively utilize both a visible light detector and an infrared light detector, switching between them based on predefined thresholds, to ensure effective human presence detection in varying lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a visible light detection device is used for human presence detection, then the device can detect human presence in well-lit conditions, but the sensitivity decreases and detection becomes difficult in low-light conditions
Solution Approach 1:
The patent changes the detection parameter from visible light to infrared light based on lighting conditions. The processing circuit determines whether to use the visible light detector or infrared detector by comparing the luminance value with a threshold, thereby adapting the detection system to different illumination environments and maintaining reliable human presence detection.
2Adaptability or versatility
If only a visible light detector is used, then the device structure remains simple, but the detection capability is limited in low-light environments
Solution Approach 1:
The patent implements multi-functionality by equipping the detection device with both a visible light detector and an infrared detector. The processing circuit selectively activates the appropriate detector based on lighting conditions, enabling the single device to function effectively in both well-lit and low-light environments without requiring separate detection systems.
3Measurement precision
If an infrared light detector is always used, then detection accuracy in low-light conditions is maintained, but power consumption increases
Solution Approach 1:
The patent implements dynamic operation by having the processing circuit continuously monitor lighting conditions and switch between the visible light detector and infrared detector based on the current environment. The system uses the visible light detector in well-lit conditions to conserve power and switches to the infrared detector only when necessary in low-light conditions, achieving both energy efficiency and detection accuracy.
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
Ensures reliable human presence detection in both well-lit and low-light environments by leveraging the strengths of both detectors, enhancing detection accuracy and reducing power consumption.
Implementation Method 1
The visible light detector is configured to detect visible light
Implementation Method 2
The infrared light detector is configured to detect infrared light
Data Source
AI summary
A detection system includes a visible light detector, an infrared detector, and a processing circuit. The visible light detector is configured to detect visible light. The infrared detector is configured to detect infrared light. The processing circuit is configured to determine whether a parameter of the visible light detector is larger than a threshold. If the parameter of the visible light detector is larger than the threshold, the processing circuit executes a human presence detection according to the infrared light detected by the infrared detector, and generates a human presence detection result.