Wallmount Dual Beam Sensor for 3D Occupancy Detection
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Solution Overview
Problem
Conventional sensing devices, such as infrared and ultrasonic detectors, face issues with two-dimensional detection, unreliable results, failure in wall penetration, and aesthetic unpleasing designs, leading to energy waste in public spaces due to incomplete detection of human presence, especially in areas with partitions.
Innovation Solution
A wallmount dual beam sensing device incorporating a passive infrared detector and a microwave sensing module, with a microcontroller unit that activates the microwave module based on infrared detection, allowing for 3D sensing and reliable detection of human presence without external holes, thus enabling efficient control of lighting and air conditioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional infrared detectors are mounted on ceilings and appear outside, then they can detect human presence, but they are aesthetically unpleasant and provide only two-dimensional detection
Solution Approach 1:
The sensing device is nested within the wall structure itself, with the detection face integrated into the wall surface. The housing is mounted flush with the wall, and the detection cover is positioned within the wall plane, making the device invisible or minimally visible from the exterior while maintaining full detection functionality.
Solution Approach 2:
The wall structure serves as an intermediary medium that houses the sensing device internally while presenting a clean aesthetic exterior. The wall acts as both the mounting structure and the aesthetic cover, eliminating the need for visible external mounting hardware or protruding components.
2Reliability
If conventional infrared detectors are mounted on ceilings, then they can detect human presence, but they fail to determine distance and provide only two-dimensional detection
Solution Approach 1:
The patent combines multiple sensing technologies (infrared detection and microwave sensing) into a single integrated device. The infrared detector captures thermal radiation patterns while the microwave sensor provides additional spatial information, and their data is processed together by the control module to achieve both presence detection and distance measurement capabilities in three dimensions.
Solution Approach 2:
The device transitions from two-dimensional ceiling detection to three-dimensional wall-mounted detection by utilizing the wall surface's spatial position. The wall mounting allows the sensor to detect objects in front, to the sides, and at varying distances, creating a three-dimensional detection zone that extends outward from the wall surface rather than covering a flat ceiling plane.
3Reliability
If infrared detection is applied to places with multiple partitions, then it can detect human presence in open areas, but people inside partitions fail to be detected
Solution Approach 1:
The patent merges infrared detection with microwave sensing capabilities in a single device. The microwave sensor component can penetrate non-metallic partitions and detect objects through walls and barriers that block infrared radiation, thereby complementing the infrared detector's open-area performance and providing reliable detection in partitioned environments.
4Reliability
If ultrasonic sensing devices are used, then they can detect human presence, but holes must be formed through them which are aesthetically unpleasant and can malfunction from foreign matter
Solution Approach 1:
The ultrasonic or other sensing components are nested within the wall-mounted housing, with all sensing elements positioned behind or within the wall surface. The detection face is integrated into the wall structure without requiring external holes or openings, maintaining a clean aesthetic appearance while protecting internal components from foreign matter intrusion.
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 device provides reliable 3D environmental sensing, reducing energy waste by accurately detecting human presence in various environments, including areas with partitions, while maintaining an aesthetically pleasing design by being mounted on walls without external holes.
Implementation Method 1
a passive infrared detector and a microwave sensing module
Implementation Method 2
a passive infrared detector and a microwave sensing module
Data Source
AI summary
A wallmount dual beam sensing device has a microcontroller unit (MCU) mounted inside a housing and electrically connected to an ambient light detector, an infrared detector and a microwave sensing module. The MCU determines if the infrared detector and the microwave sensing module are activated according to detected luminance by the ambient light detector and outputs a control signal when the infrared detector and the microwave sensing module are activated and any one of the infrared detector and the microwave sensing module detects the presence of people in a monitored environment. Accordingly, the infrared detector and the microwave sensing module statically and dynamically sense the monitored environment in a 3D manner at the same time, thereby ensuring a stable and reliable sensing result.