Cross-zone Supervision for Security Sensors
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Solution Overview
Problem
Conventional security systems face issues with defective or obstructed sensors due to aging, environmental factors, and deliberate interference, leading to potential false alarms and reduced security effectiveness.
Innovation Solution
A method and apparatus that detect error conditions in security devices by monitoring consecutive alarm conditions across overlapping zones, using a central security control node to verify faults and transmit error signals to a central station, ensuring accurate sensor functionality and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single security device monitors a single zone, then the system is simple and easy to operate, but the reliability is reduced because defective or obstructed sensors cannot be detected
Solution Approach 1:
The monitoring function is segmented between multiple security devices. Each device monitors its primary zone while also supervising overlapping zones through cross-zone monitoring capabilities, allowing defect detection without requiring a completely centralized complex system
Solution Approach 2:
Security devices are given multiple functions: they monitor their primary zone for security threats while simultaneously serving as supervision devices for overlapping zones. This multi-functionality enables defect detection without adding separate dedicated monitoring systems
2Reliability
If redundancy of sensors is provided for alarm verification, then the security level is improved, but false sense of security occurs when sensors are defective
Solution Approach 1:
A feedback mechanism is implemented where security devices report their operational status and alarm conditions to the control panel. The control panel analyzes this feedback to detect when sensors may be defective based on patterns of alarm conditions, preventing false security while maintaining redundancy
Solution Approach 2:
The system performs preliminary defect detection by monitoring alarm conditions before they result in false security situations. By analyzing consecutive alarm conditions and sensor responses in advance, the system can identify potentially defective sensors before they compromise security verification
3Measurement precision
If sensors are deployed to cover overlapping zones, then the measurement precision is improved, but the device complexity increases due to cross-zone supervision requirements
Solution Approach 1:
The supervision function is merged with the primary security monitoring function. Security devices in overlapping zones automatically serve dual purposes: monitoring their primary zone and supervising neighboring zones, eliminating the need for separate supervision systems and reducing overall complexity
Data Source
AI summary
An error condition, fault, defect, obstruction, or defective arrangement of viewing angle is determined in a target security device, such as a motion sensor. A plurality of times a fault is detected in a first security device arranged to sense activity in a first zone, the target security device being arranged to sense activity in a second zone overlapping with the first zone; and the error condition may be determined in the target security device when fault in the target security device is not detected for the plurality of times. The second zone may overlap substantially all of the first zone. The first security device may be a door security sensor, a gate security sensor, a keypad or a motion detector. When the first security device is a keypad or user interface, the fault may be an arm or disarm command or an arm/disarm command cycle.