Gas Pressure Sensor Security System for Door Access Detection
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Solution Overview
Problem
Building security systems are vulnerable to break-ins due to the lack of effective detection methods for unauthorized access through doors and windows, as existing systems rely on motion detectors and cameras that are not sufficiently robust.
Innovation Solution
A security system utilizing pairs of gas pressure sensors installed inside and outside doors and windows, connected to cameras, which capture photos and videos when significant gas pressure changes within preset ranges are detected, indicating potential unauthorized access, and transmit this information to validated contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion detectors and cameras are used for security monitoring, then the building can detect unauthorized access, but the detection reliability is insufficient and false alarms occur frequently
Solution Approach 1:
The security monitoring function is segmented into multiple independent detection dimensions: gas pressure detection, motion detection, and visual capture. Each sensor type monitors a different aspect of the environment, and their results are combined through logical operations (AND gate) to achieve more reliable detection with reduced false alarms.
Solution Approach 2:
The gas pressure sensor serves multiple functions: it detects door/window opening events, monitors unauthorized access attempts, and provides environmental data for analysis. This multi-functional sensor replaces or supplements traditional single-function detectors, improving overall system reliability.
2Reliability
If gas pressure sensors are installed inside and outside doors and windows, then unauthorized access can be detected through pressure changes, but the device complexity increases
Solution Approach 1:
The detection system is segmented into distributed sensor nodes placed at specific locations (inside and outside doors/windows). Each node independently monitors local pressure conditions, and the controller aggregates data from all nodes. This modular segmentation makes the complex system manageable and scalable.
Solution Approach 2:
A wireless communication module acts as an intermediary between the distributed pressure sensors and the central controller. This intermediary enables data transmission without complex wiring, reducing installation complexity while maintaining reliable detection capabilities.
3Measurement precision
If multiple sensors and cameras are integrated into the security system, then detection accuracy improves, but the energy consumption increases
Solution Approach 1:
The system employs periodic sampling of gas pressure data at predetermined time intervals rather than continuous monitoring. This periodic action maintains detection accuracy for slow-changing pressure conditions while significantly reducing energy consumption compared to continuous high-frequency sampling.
Solution Approach 2:
The system pre-sets threshold values for gas pressure changes and motion detection levels. By establishing these thresholds in advance, the system can quickly compare real-time data against predefined criteria, enabling accurate detection decisions without requiring complex real-time analysis, thus reducing processing energy consumption.
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
Enhances building security by providing real-time detection and alerting mechanisms for unauthorized access through doors and windows, leveraging gas pressure changes to differentiate between normal and suspicious activities, thereby improving response times and security measures.
Implementation Method 1
a processor receives a plurality of gas pressure signals generated by a pair of gas pressure sensors
Data Source
AI summary
A security device and method receives gas pressure signals from a pair of gas pressure sensors, one set at the inside and the other at the outside of a door or a window. Gas pressure values for the signals (of the indoor and outdoor environments) are obtained and a camera, working in the same location as the pair of sensors, is controlled to capture photos or videos when it is determined that the gas pressure values of both sensors have changed and magnitude of the changes are both within a preset gas pressure range. Photos and videos are captured by the camera and transmitted to at least one validated contact according to preset contact information.