Infrared EAS Pedestal Zone Detection
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Solution Overview
Problem
Conventional Electronic Article Surveillance (EAS) systems struggle to accurately determine the location of objects or persons within the detection zone, particularly in multi-pedestal configurations, leading to inefficiencies and incorrect alarm triggering.
Innovation Solution
The system employs a method involving simultaneous emission of infrared signals from multiple emitters on one pedestal and detection by corresponding detectors on another, analyzing signal blockage patterns and timing differences to determine the location of objects or persons within the EAS detection zone, allowing for precise identification of the zone and dynamic adjustment of antenna settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple pedestals are used to expand detection coverage, then the detection area is improved, but the system cannot determine which side of the pedestal a marker signal is coming from and efficiency is reduced
Solution Approach 1:
The detection zone is divided into multiple sub-zones using infrared emitters and detectors positioned at each pedestal. Each pedestal independently monitors its own detection zone, segmenting the overall detection area into manageable sections. This allows the system to determine which specific sub-zone contains a marker, improving both coverage and efficiency by eliminating the ambiguity of signal origin.
2Loss of information
If AM marker amplitude is used to estimate pedestal proximity, then location information is obtained, but multiple pedestals or multiple marker sources reduce efficiency and cannot determine which side of the pedestal a marker signal is coming from
Solution Approach 1:
Infrared emitters and detectors are introduced as intermediary components to provide directional information about marker locations. The infrared signals act as a mediator that travels from each pedestal through its detection zone, allowing the system to determine which specific pedestal and side of the pedestal a marker is located at, based on which infrared signal is blocked by the marker.
3Measurement precision
If people counters are added to define zones, then zone identification is improved, but the system still cannot determine which side of the pedestal a marker signal is coming from
Solution Approach 1:
The infrared emitter-detector system serves multiple functions: it defines detection zones, determines marker location within zones, identifies which side of a pedestal a marker is at, and provides directional information. This multi-functional approach eliminates the need for separate people counters while achieving superior location precision and reducing overall system complexity.
4Area of stationary object
If the interrogation field extends beyond the intended detection zone, then coverage is improved, but false detection may occur outside the intended zone
Solution Approach 1:
Each pedestal is equipped with infrared emitters and detectors that create localized detection zones with specific directional characteristics. The infrared signals are confined to specific angular ranges, allowing each pedestal to monitor only its intended detection zone. This localizes the detection quality to specific areas, preventing false detections from extending beyond intended zones while maintaining adequate coverage.
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
This approach enables accurate determination of object or person location, reducing false alarms and optimizing antenna settings, thereby enhancing the efficiency and accuracy of EAS systems.
Implementation Method 1
simultaneously emitting a first signal from a first emitter (e.g., a first infrared emitter) and a second signal from a second emitter (e.g., a second infrared emitter)
Implementation Method 2
a determination is made as to where the object or person is within the EAS detection zone based on a pattern of a signal output from at least one of the first and second detectors which reflects that at least one of the first and second signals is blocked by the object or person
Data Source
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AI summary
System (100) and method for determining where an object or person (702) is located in an EAS detection zone (150). The methods involve: simultaneously emitting a first signal from a first emitter (108) and a second signal from a second emitter (202); concurrently detecting the first and second signals during a first period of time by each of a first detector (110) and a second detector (204); and determining where the object or person is within the EAS detection zone based on a pattern of a signal output from at least one of the first and second detectors which reflects that at least one of the first and second signals is blocked by the object or person during at least one of a second period of time and a third period of time in which the object or person is traveling through the EAS detection zone.