G - Physics – 01 – D
Patent
G - Physics
01
D
G01D 5/26 (2006.01) G01S 7/483 (2006.01) G08B 13/184 (2006.01)
Patent
CA 2280563
A perimeter monitoring system is arranged to detect passage across a perimeter of an area. The system primarily includes an emitter (120), a retroreflector (116), a detector (122) and an alarm (146). The emitter (120) provides a modulated visible laser beam (115). The retroreflector is arranged to direct the beam along a segment of the perimeter and return the beam along the segment. The detector (122) includes a device (208) that blocks reception of light outside an angle of less than 5 degrees. One or more local or remote alarms (162) are activated in response to the signal. For example, a remote alarm is located on the inside of a residence window where it is activated by another visible laser beam. Alignment of the peripheral monitoring system is less costly and false alarms are less likely than with known system.
Beamerline Llc
Gowling Lafleur Henderson Llp
LandOfFree
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