What is the standard loop detector size?
Small-area detection is commonly implemented with a single short inductive loop. Although the literature defines short loops as being up to 20 ft (6.1 m) in length, by far the most common short-loop application is the 6- x 6-ft (1.8- x 1.8-m) loop in a 12-ft (3.6-m) lane.
How does a loop detector work?
Vehicles passing over or stopped within the detection area of an inductive-loop detector decrease the inductance of the loop. The electronics unit senses this event as a decrease in frequency and sends a pulse to the controller signifying the passage or presence of a vehicle.
How do you install an inductive loop?
The inductive loop In existing road surfaces the loop wire is normally installed by cutting a narrow slot in the pavement with a concrete cutter, winding the loop conductors into the slot and filling the slot with bitumen or epoxy to exclude any water entering the slot and preventing any movement of the conductors.
How deep are traffic signal loops?
Sawcut Depth However, some agencies such as the Virginia DOT use 3- and 4-inch (76- and 102-mm) slot depths for multiple wire-turn loops to prevent overlays from destroying the loop. The depth of the sawcut should be verified frequently during cutting to assure a constant value.
How do gate loop detectors work?
Exactly how does it work? The loop detector plugs into the gate operator’s main circuit board. The loop, a continuous length of wire, resonates at a regular frequency. But when something big and metal rolls over the loop, the frequency increases.
What is a gate loop detector?
INTRODUCTION. A loop detection system is a method of sensing vehicles and is typically used in automated gate applications to prevent a gate from automatically closing on a vehicle or to automatically open the gate when a vehicle is exiting a property.
What is a vehicle loop detector?
Vehicle Loops and Loop Detectors are used to detect the presence of a vehicle to open a gate, or as a safety device to prevent the gate from closing on a vehicle in its path. Inductance Loops are available as Direct Burial or Cut-In.