Patent ID: 7511615

Claim:
An assembly for providing an anti-intruder optical veil, which sets up an alarm when being breached, the assembly comprises of: (a) at least a first and a second array having a multiplicity of infra-red optical transceivers, each transceiver includes a light source and a light detector, the arrays are mounted oppositely facing each other, wherein the light detector of the transceiver in each array is responsive to illumination emitted by more than a single light source of said transceiver of said opposite array, (b) an electronic driver attached to said light source of each said transceiver of said at least first and second array to produce intermittent illumination signals having variable intensity, (c) an analog amplifier attached to said light detector of each said transceiver of said at least first and second array to amplify the signal of said light detector by a variable gain level and, (d) a microprocessor unit attached to each said transceiver of said at least first and second array to adjust illumination power output of said electronic driver according to an output level of said analog amplifier.