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Exit Loop Detector
An exit loop detector is a system designed to automatically open gates or barriers for vehicles leaving a secured area. It works primarily on the principle of electromagnetic induction and is a common component in automated access control systems for driveways, parking lots, and commercial properties.
Here's how it generally works:
- Inductive Loop: A wire loop, usually rectangular, is buried beneath the surface of the driveway or exit lane. This loop is connected to a loop detector unit.
- Electromagnetic Field: The loop detector sends an alternating current through the wire loop, creating a continuous electromagnetic field around it.
- Vehicle Detection: When a vehicle (which contains a significant amount of metal) drives over or within the range of this electromagnetic field, it disrupts the field. This disruption causes a change in the loop's inductance.
- Signal to Gate Operator: The loop detector senses this change in inductance and sends a signal to the gate or barrier's control system.
- Automatic Opening: Upon receiving the signal, the gate operator is triggered to open, allowing the vehicle to exit without requiring a remote control, keypad, or manual intervention.
