Downlight-Integrated Millimeter-Wave Radar for Entry Direction Sensing
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Solution Overview
Problem
Conventional light systems, such as infrared and camera-based systems, struggle to accurately detect the direction of human movement and count individuals entering or exiting a space, leading to inefficiencies in managing lighting and other building systems.
Innovation Solution
Integration of a millimeter-wave radar system within a downlight that uses signal processing techniques to determine the direction and number of humans entering or exiting a space, transmitting data via a low-power wide-area network to a wireless server for controlling lighting and interacting with other building systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional infrared and camera-based systems are used for human detection, then the system structure is simple, but the detection precision of human movement direction and count is insufficient
Solution Approach 1:
The patent combines the radar system with the downlight fixture, integrating multiple functions (lighting and human detection) into a single device. This merging approach improves detection precision while managing system complexity by consolidating components rather than adding separate detection devices.
Solution Approach 2:
The patent replaces conventional infrared and camera-based detection systems with millimeter-wave radar technology. This substitution provides superior detection precision for human movement direction and count through radar's ability to accurately measure velocity and position, despite increasing electronic system complexity.
2Measurement precision
If millimeter-wave radar system is integrated into downlight, then the detection precision of human movement is improved, but the device complexity increases
Solution Approach 1:
The radar system is integrated within the downlight fixture structure, combining lighting and detection functions. This merging reduces the need for separate detection devices and manages overall system complexity while maintaining high detection precision.
Solution Approach 2:
The downlight fixture is designed to serve multiple functions: providing illumination through LEDs and performing human detection through the integrated millimeter-wave radar. This multi-functionality approach improves detection capabilities while utilizing the existing downlight structure, thereby managing complexity.
3Reliability
If separate detection devices are used for human detection, then the detection function is specialized, but the overall system complexity and installation complexity increase
Solution Approach 1:
The patent merges the detection function into the downlight fixture itself, eliminating the need for separate detection devices. This integration maintains reliable detection functionality while reducing overall system complexity and the number of components that need to be installed and coordinated.
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 detection of human movement direction and count, optimizing lighting and system control based on real-time data, enhancing operational efficiency and user experience.
Implementation Method 1
a millimeter-wave radar including: an antenna disposed in the housing
Implementation Method 2
a plurality of light emitting diodes (LEDs) disposed in a housing of the downlight
Data Source
AI summary
In an embodiment, a downlight includes: a plurality of light emitting diodes (LEDs) disposed in a housing of the downlight, and a millimeter-wave radar. The millimeter-wave radar includes: an antenna disposed in the housing, a controller configured to: detect a presence of a human in a field-of-view of the millimeter-wave radar, determine a direction of movement of the detected human, and produce log data based on the direction of movement of the detected human, and a wireless module configured to transmit the log data to a wireless server.