Patent ID: 6816073
Filing Date: 2004-11-09
Classification: G01S,G08B

Abstract:
An apparatus, comprising:a first fence post that comprises a first motion sensor and a first laser sensor; and a second fence post that comprises a second motion sensor and a second laser sensor; wherein the first and second fence posts cooperate to represent a subportion of a perimeter to be secured; wherein the first and the second laser sensors are inactive until a detection of physical movement by one or more of the first and second motion sensors; wherein upon physical movement in a region outside the subportion of the perimeter to be secured the one or more of the first and second motion sensors servo to automatically perform a detection of the physical movement in the region outside the subportion of the perimeter to be secured; wherein upon the detection of the physical movement in the region outside the subportion of the perimeter to be secured the one or more of the first and second motion sensors serve to automatically activate the first and second laser sensors and cause the first and second laser sensors to monitor for physical movement at the subportion of the perimeter to be secured.