Topic - EAS Surveillance (Electronic Article Surveillance)

What is it?

A security device. Two shaped pedestals outside a store door to detect theft. They are intended to detect security tags on items and set off an alarm if someone leaves with an item that still has a security tag on it

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Observation

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Research

The two pillars create an electromagnetic field to detect a security tag. The tag is embedded with a Radio Frequency (RF) circuit. The pillars beep when a potential theft is detected. However, the pillars often go off and "beep" even when fraud is not occurring. This happens because the pillars don't "detect" the item itself; rather, the tag picks up energy from the pillar and responds by broadcasting its own signal, which the pillar then detects to trigger the alarm.

The problem is that these systems cannot always tell the difference between a security tag and electronic noise. Because they are looking for a simple, generic frequency rather than a specific digital signature, environmental interference—such as loose wires, neon signs, or even another store's tag—can create "false positives." In these cases, the system isn't detecting a tag, but simply reacting to background electronic noise.

In China, they use RFID (Radio Frequency Identification) for items being purchased. Conversely, each tag has a microchip giving each item a unique "ID." When the cashier scans each item, the system's database marks that specific ID as "paid." The gate will then only "beep" if an item is recognized as "unpaid."

This is a smarter application of radio signals because the "errors" move from the technical to the procedural. Instead of beeping due to unreliable environmental interference, the system only beeps due to human error, such as a cashier forgetting to scan an item. This makes the system more reliable.

Redesign

The system, as it works in China already offers a significant improvement to this system technically. To make a practical redesign that is even better, we’d have to consider different sensors. So instead, we decided to go the funny route. Imagine, these pillars had eyes and voices, and instead of beeping when the alarm went off, they opened their eyes and, in a funny voice, asked, “Are you trying to steal?”

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Readings

Air