16
Triggering the detector
Figure 10 – most
sensitive trigger
In
figure 10
, a body moving from position 1 to position
2, into the infrared beam zone, will create a pulse.
Moving from position 2 to 3, out of the other side of
the same infrared beam zone, will create another
pulse. If the body moves from position 1 to position 3
within 10 seconds then the detector will have
received 2 pulses in 10 seconds. This means the
detector will have made a valid movement detection
and will trigger, indicated by the red light. This also
applies if the body moves in the opposite direction.
No trigger body movements
Figure 11 – no
trigger
No trigger body movements are body movements
which are too small to be recognized as valid body
movements to trigger the detector.
In the example, shown by
figure 11
, a body walking
into one side of the infrared beam zone, then back
out the same side of the infrared beam zone will not
trigger the detector. A body moving from position 1 to
2, into the infrared beam zone, will only create
pulsing. A body moving from position 2 back to
position 1 or from position 2 to position 3 (out of the
same side of the infrared beam zone) may create
further pulses but will not trigger the detector. This
also applies if the body is moving in and out of the
infrared beam zone from the other side.
