Electrostatic Field Sensor for Human Presence Detection
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Solution Overview
Problem
Current home security systems are primarily reactive, failing to provide preventive security as they only detect intrusions after they have occurred, and existing electrostatic field sensors suffer from uncontrolled signals and inability to differentiate between human and animal presence or objects.
Innovation Solution
A home security system utilizing a controlled electrostatic field sensor that measures disturbances around a single coaxial cable antenna to detect human presence proactively, differentiating between humans and other objects by analyzing changes in the electrostatic field, and integrating this technology into doors, windows, and walls for early intrusion detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional volumetric sensors or infrared barrier sensors are used, then intrusion detection is achieved, but the system cannot differentiate between human presence and other moving objects
Solution Approach 1:
The patent changes the detection parameter from general motion detection to specific electrostatic field capacity measurements. By measuring the capacitive effect caused by human bodies (which have different dielectric properties than animals or objects), the system achieves human-specific detection without requiring complex multi-sensor arrays.
2Measurement precision
If electrostatic field sensors with uncontrolled signals are used, then human presence detection is improved, but the system becomes sensitive to temperature and humidity variations
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the electrostatic field capacity and compares it against reference values. The controller adjusts detection thresholds dynamically to compensate for environmental variations, maintaining reliable human presence detection despite changes in temperature and humidity.
3Power
If square wave generators operating at 50-5000 Hz are used, then electrostatic field generation is achieved, but magnetic field interference and signal control issues arise
Solution Approach 1:
The patent replaces the traditional square wave generator approach with an alternative electrostatic field generation method that avoids magnetic field generation. By using a different excitation mechanism that does not rely on high-frequency alternating currents, the system eliminates magnetic interference while maintaining effective electrostatic field strength for detection.
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 proactive detection of intrusions before they happen, distinguishing between human and non-human entities, and integrates seamlessly into home security systems without the need for extensive installation, providing enhanced preventive security.
Implementation Method 1
measuring disturbances occurring in the electrostatic field around a probe that acts as an electrode or antenna
Implementation Method 2
measuring disturbances occurring in the electrostatic field... This capacity creates a magnetic field
Data Source
AI summary
Home security system installed in an enclosure, window or door and comprising un controlled magnetic field sensor (3) connected to an antenna (4) configured as a single electrode, in such a way that said sensor measures disturbances of the magnetic field around said antenna; and is characterized in that the controlled magnetic field sensor is configured to detect a disturbance in the magnetic field detected by its antenna and establish if there is a presence of a person depending on the power of the disturbance; and send an alert for the presence of a person.