Radar Presence Sensor With Adjustable Detection Exclusion Zone
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Solution Overview
Problem
Pyroelectric sensors in motion detectors are highly temperature-dependent, leading to imprecise detection ranges and difficulties in adjusting a specific, spatially arbitrary detection area, necessitating cumbersome software parameterization and unsightly physical obstructions.
Innovation Solution
A building installation device with a radar sensor and a non-detection zone between the detection area, allowing precise, temperature-independent detection range adjustment via an end device, eliminating the need for physical obstructions and enhancing user flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pyroelectric sensors are used for motion detection, then the detection function is provided, but the detection range becomes highly temperature-dependent and imprecise
Solution Approach 1:
The patent changes the detection parameter from pyroelectric (temperature-sensitive) to radar-based (temperature-independent) detection. The radar sensor uses electromagnetic wave reflection principles that are not affected by ambient temperature variations, thereby resolving the contradiction between detection precision and temperature independence.
2Adaptability or versatility
If software parameterization is used to adjust sensitivity, then the detection sensitivity can be modified, but the process becomes cumbersome and inconvenient
Solution Approach 1:
The system performs self-configuration by automatically determining the detection range based on the installation location and environmental characteristics. The control unit processes radar signals to identify boundaries and sets detection parameters automatically, eliminating the need for manual software parameterization and making the system easy to deploy without technical expertise.
3Area of stationary object
If plastic caps are placed over the sensor to restrict detection range, then the detection area can be artificially limited, but the solution is insufficiently accurate and unsightly
Solution Approach 1:
The patent replaces the mechanical approach of using plastic caps to block the sensor with an electronic/software-based solution. The radar sensor combined with the control unit dynamically defines detection boundaries through signal processing and parameter settings, achieving precise area definition without physical obstructions.
4Ease of operation
If a global sensitivity setting is applied to all pyroelectric sensors, then the sensitivity can be uniformly adjusted, but a specific spatially arbitrary detection area cannot be defined
Solution Approach 1:
The system implements local quality by allowing different detection parameters to be applied to different spatial zones. The control unit can define specific detection areas and exclusion zones independently, enabling precise control over which regions are monitored while maintaining simple adjustment procedures through the radar-based spatial mapping capability.
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
Provides a precise, spatially arbitrary, and temperature-independent detection range with easy adjustment, improving detection accuracy and user convenience without physical obstructions.
Implementation Method 1
the presence sensor includes a radar sensor
Data Source
Figure 1~2
AI summary
An installation device I for building installation technology is presented, comprising a presence sensor R for detecting a person P within a room, a control and evaluation unit MC, a power supply connection, and an indicator LED. A key feature is that the presence sensor R incorporates a radar sensor, with a non-detection zone NB between the detection range EB and the radar sensor, and that the detection range EB is adjustable via an end device EG.