For protection of a corner, the following installations are recommended (Figs 1.6 & 1.7)
For Perimeter with Chain-Link Fence:
If the telescope is aimed at the fence, it will "see through" the fence and alarm in response to people
and vehicles on the other side. To avoid this, the telescopes can be aimed at the ground. Or a panel
can be added to the fence. Possible materials: marine plywood or acryllic plastic sheet (this is opaque
in the long wave infrared). See Fig 1.8.
1.9
POTENTIAL FALSE ALARM SOURCES
Various sources may affect the performance of an outdoor security system. For instance, DO NOT
aim the telescope into the horizon (straight out), UNLESS you are aiming into a wall, the side of a
building or an embankment that is within your monitored perimeter. Although the telescope will detect
a person at 500 feet under most conditions, it may detect a larger heat source, like a truck or an
airplane, to a distance greater than several thousand feet, or thermal perturbations in distant
Telescope
Blocking
Panel
Figure 1.8 - Use of a Blocking Panel
Page 5
Figure 1.6
Figure 1.7
