Security Alarm Control via Disarming Device Presence
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Solution Overview
Problem
Conventional security systems often trigger false alarms due to legitimate motion within monitored premises, such as pets or homeowners, leading to unnecessary activation of alarms and potential police dispatches.
Innovation Solution
A security system that includes a disarming device, which, when present, prevents the activation of alarms even when motion is detected, allowing authorized entities to move freely without triggering alerts, and reverts to alarm activation when the device is absent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion detectors are deployed to monitor zones for intrusions, then the security system can detect and notify of potential intruders, but false alarms are triggered by legitimate motion such as pets or homeowners
Solution Approach 1:
A disarming device acts as an intermediary between the motion detector and alarm system. When detected in a monitored zone, it mediates by preventing the alarm from activating even when motion is detected, thus filtering out false alarms while maintaining security monitoring
Solution Approach 2:
The system changes the operational parameter of the alarm from 'activate on motion detection' to 'deactivate when disarming device present'. This parameter change allows the system to distinguish between threats and legitimate motion based on the presence/absence of the disarming device
2Reliability
If the alarm is activated upon detecting motion, then intruders are notified, but authorized individuals cannot move freely within monitored premises
Solution Approach 1:
The disarming device serves as a portable intermediary that authorized individuals carry or wear. Its presence in monitored zones mediates between security requirements and user freedom, allowing movement without triggering alarms
Solution Approach 2:
Instead of requiring authorized users to disarm the system before entering zones (which restricts movement), the system is inverted to automatically disarm when the disarming device is detected, enabling free movement while maintaining security
3Object-generated harmful factors
If a filter circuit is used to analyze motion signals and prevent alarm activation for small objects, then some false alarms are reduced, but pets and small animals still trigger alarms
Solution Approach 1:
The disarming device provides a more reliable intermediary mechanism than size-based filtering. Rather than relying on imperfect size thresholds that misclassify pets, the presence of the authorized disarming device provides clear differentiation between legitimate and intrusive motion
Data Source
AI summary
A controller arms an alarm aspect of a corresponding security system. The corresponding security system is initially configured to audibly activate an alarm in response to detecting motion of free-to-roam entities in a monitored location. The free-to-roam entities can be provided unrestricted access into the monitored location. In addition to monitoring for presence of motion at the monitored location, the security system monitors the location for presence of a disarming device. At times of detecting presence of the disarming device at the monitored location, the security system prevents activation of the alarm based on detecting the motion of the free-to-roam entities.