Loop Info-Q-2-16
5
Winding the loops in the same direction (Clockwise or Counter-Clockwise) electrically creates the effect of the electrical current
passing through the closest edges of the loops in opposite directions. Since the electrical currents are flowing in the opposite
directions, the inductive fields of sensitivity created have the same magnetic poles (North or South) toward each other. Since
“likes” repel, the fields of sensitivity are pushed up and away from each other, creating a “Dead Zone”.
• The detection field shown is a relative profile of the detection height and will vary with the size of the loops, spacing
between the loops, and the type of vehicle. The relative height over the two inside wires increases as the loops are moved
closer together and decreases as the loops are moved apart.
Field Cancellation Effect
Both loops wound counter-clockwise.
Counter-clockwise Loop Counter-clockwise Loop
Dead Zone
Inside
Wire Field
Outside
Wire Field
Slide Gate
2 loops wound in the same direction repel the inside wire fields.
Slide Gate
Winding the loops in the opposite direction (Clockwise or Counter-Clockwise) electrically creates the effect of the electrical
current passing through the closest edges of the loops in the same direction. Since the electrical currents are flowing in the
same direction, the inductive fields of sensitivity created have opposite magnetic poles (North or South) toward each other.
Since “unlikes” attract, the fields of sensitivity pull towards each other, creating a larger zone of detection. Winding the loops in
electrically opposite directions could create an enhanced zone that would inhibit a slide gate from closing.
• The detection field shown is a relative profile of the detection height and will vary with the size of the loops, spacing
between the loops, and the type of vehicle. The relative height over the two inside wires decreases as the loops are
moved closer together and increases as the loops are moved apart.
Field Enhancement Effect
Loop wound
Clockwise.
Loop wound
Counter-Clockwise.
Clockwise Loop
Inside
Wire Field
Outside
Wire Field
Counter-clockwise Loop
2 loops wound in opposite directions attract the inside wire fields.
Inside Wire
s
Start
Fi
nish
Sta
rt
F
in
i
sh
Star
t
F
in
i
sh
6
9
3
12
In
side Wires
6
9
3
12
S
t
a
rt
Fin
i
sh
6
93
12
Inside Wires
Inside Wires
6
93
12
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