Dual-Detection Access Control Reducing False Alarms
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Solution Overview
Problem
Existing access control systems suffer from high false alarm rates and high energy consumption, which lead to increased operational costs.
Innovation Solution
A dual-detection system comprising a motion sensor and an RFID reader, where the processor verifies the presence of a subject and their associated RFID tag to accurately determine access events, reducing false alarms and energy usage by overlapping detection ranges and using passive UHF RFID tags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single detector is used to monitor access, then the system is simple and low cost, but the false alarm rate is high
Solution Approach 1:
The access control system is segmented into two independent detection functions: a motion sensor for detecting subject presence and an RFID reader for detecting object identifiers. This segmentation allows each component to perform its specific function accurately, reducing false alarms while maintaining manageable system complexity through modular design.
Solution Approach 2:
The processor acts as an intermediary that receives and correlates signals from both the motion sensor and RFID reader. By requiring coincidence of both signals (motion detection plus valid RFID identification) to trigger an access event, the system eliminates false alarms that would occur with a single detector, while the processor manages the complexity of coordinating multiple detectors.
2Reliability
If continuous monitoring is performed to ensure accurate access detection, then detection accuracy is high, but energy consumption is high
Solution Approach 1:
The system employs periodic action by having the motion sensor continuously monitor for motion events, and only then activating the RFID reader for targeted identification verification. This event-driven periodic operation maintains high detection accuracy when access events occur while significantly reducing energy consumption during normal idle periods compared to continuous monitoring of both detectors.
Solution Approach 2:
The motion sensor performs preliminary detection to identify potential access events before the RFID reader is activated. This preliminary action filters out false positives early in the detection sequence, allowing the energy-intensive RFID reader to operate only when necessary, thus maintaining detection accuracy while minimizing overall 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
The system effectively reduces false positives and negatives in access event detection, lowers maintenance costs, and operates efficiently with a compact, plug-and-play design.
Implementation Method 1
The motion sensor may comprise a photocell sensor, a passive infrared sensor, or a magnetic sensor
Implementation Method 2
The motion sensor may comprise a photocell sensor, a passive infrared sensor, or a magnetic sensor
Implementation Method 3
the second detector is an electromagnetic field detector
Implementation Method 4
the second detector comprises an RFID reader and one or more antennas while the object (carried by the subject) is an RFID tag
Implementation Method 5
the first detector comprises a transceiver arranged to emit a signal and to detect the signal reflected from a subject
Data Source
AI summary
An access control system comprising a first detector, a second detector, and a processor. The first detector is operable to detect presence of a subject in proximity of the access control system. The second detector operable to detect an object identifier associated with an object carried by the subject in proximity of the access control system. The processor is operably connected with the first detector and the second detector. The processor is operable to receive, from the first detector, a first signal indicative of the detection of the presence of the subject, and receive, from the second detector, a second signal containing the detected object identifier. During operation, the processor is arranged to determine that an access event has occurred when it receives both the first signal and the second signal.