Marker Loop Installation; General; Loop Geometry - IDENTEC SOLUTIONS i-MARK 2 Installation And Hardware Manual

6 MARKER LOOP INSTALLATION

6.1 General

The inductive loop is a surface-embedded wire loop with one or more windings. It serves as an
antenna for the ILR position marker and produces an inductive field at a frequency of 125 kHz,
modulated by the position marker with a preset ID.
When an i-B tag, equipped with an inductive receiver, enters the field, the tag wakes up, captures the
loop ID number, and stores it in the tag's memory.
Depending on the tag family, the last two received IDs and the time difference between passing over
the loop and sending the telegram will be sent multiple times voluntarily, or stored for retrieval via an
ILR reader at a later point in time.
Every loop ID number will only be stored once, at the time of peak signal. Time resolution is one
second. The sequence of tagged items passing at a higher speed can be determined by the sequence
in which the IDs are stored in the tag's memory.
Due to the simplicity of limiting the borders of the low frequency inductive fields via loop geometry
and current, the system lends itself well to lane discrimination as well as direction of travel. The
system is not suited for cyclical deployment with a single marker, such as lap counting.

6.2 Loop Geometry

Loop geometry is determined by the individual application. Loop measurements (minimal loop width,
maximal loop area) need to be considered in such a way that the object to be detected has to pass
through the loop's field.
VISIBILITY DELIVERED.
i-MARK 2 / i-MARK 3
USER MANUAL
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