Floor Slab Radar Sensing for Human Presence Differentiation
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Solution Overview
Problem
Conventional security systems, such as camera-based systems, are inadequate for reliably distinguishing between different types of objects like people and machines, and radar sensors require precise positioning and complex setups for comprehensive monitoring.
Innovation Solution
A system using a radar sensor to detect vibrations of a floor slab caused by movement, analyzing these vibrations to differentiate between humans and technical equipment, with an evaluation unit determining the presence of a person and triggering safety measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If camera-based security systems are used, then the system can monitor the area, but it cannot reliably distinguish between different types of objects like people and machines
Solution Approach 1:
The patent replaces camera-based optical detection with radar-based electromagnetic wave detection. The radar sensor emits electromagnetic waves and analyzes the reflected signals to detect objects, achieving more reliable differentiation between people and machines through physical property analysis rather than visual recognition, thereby improving reliability while maintaining system simplicity
Solution Approach 2:
The patent changes the detection parameter from visual appearance (camera) to physical properties such as radar reflection characteristics, movement patterns, and vibration signatures. By analyzing these physical parameters, the system can reliably distinguish between different object types without requiring complex image processing algorithms
2Reliability
If radar sensors are used for comprehensive monitoring, then reliable object differentiation is achieved, but precise positioning and complex setup are required
Solution Approach 1:
The radar sensor is designed to perform multiple functions: detecting objects, differentiating between object types, and monitoring safety zones. This multi-functionality eliminates the need for separate sensors for different purposes, allowing comprehensive monitoring with a single device and simplifying installation
Solution Approach 2:
The system uses vibration frequency analysis as a key parameter to differentiate objects. By detecting the natural vibration frequencies of objects when struck by radar waves or during movement, the system can identify object types without requiring precise positioning, as vibration signatures are inherent properties that work across different installation locations
3Area of stationary object
If a network of radar devices is deployed for comprehensive floor monitoring, then complete coverage is achieved, but the system becomes very complex
Solution Approach 1:
The patent merges multiple detection functions into a single radar sensor unit. The sensor combines object detection, classification, and safety monitoring capabilities in one device, eliminating the need for complex networks of multiple specialized sensors and simplifying the overall system architecture
Solution Approach 2:
The patent introduces vibration frequency analysis as an additional dimension of detection. By analyzing the frequency domain characteristics of reflected radar waves, the system achieves comprehensive monitoring through enhanced signal processing rather than through spatial distribution of multiple sensors, reducing the need for extensive sensor networks
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 reliable differentiation and flexible, cost-effective monitoring of objects on a floor slab, allowing timely safety responses to potential hazards.
Implementation Method 1
a radar sensor (12) which is designed to detect vibrations of the base plate (50) caused by the movement of an object
Implementation Method 2
The strength of the reflection depends on the material properties and the surface of the base plate. The radar sensor is configured to receive the reflected waves. When the base plate vibrates or...As the base plate moves, the distance between the radar sensor and the base plate changes. This change in distance leads to a phase shift and/or a frequency change (Doppler effect) of the reflected waves.
Data Source
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AI summary
A device for monitoring the presence of a person on a floor slab comprises a radar sensor configured to detect vibrations of the floor slab due to movement of an object on the floor slab, in particular due to a person walking on the floor slab, and to generate a corresponding signal, and an evaluation unit configured to determine, based on the signal, whether the object is a person and to provide a control unit with corresponding information in order to ensure the safety of the person.