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    • 3. 发明授权
    • Electro-optical perimeter intrusion alarm
    • 电光周边介入报警
    • US3641549A
    • 1972-02-08
    • US3641549D
    • 1970-06-25
    • SANDERS ASSOCIATES INC
    • MISEK VICTOR AMYERS ROBERT
    • G08B13/184G08B13/00
    • G08B13/184
    • An electro-optical perimeter intrusion alarm system wherein a pulsed beam of collimated optical energy from a transceiver is directed sequentially to a plurality of partially retroreflective stations. Each station may have an additional reflector for directing energy transmitted by that station in a desired direction to enclose a perimeter with a beam or beams of energy. An intruder interrupting the beam blocks the pulsed energy which would otherwise be returned to the transceiver by any retroreflectors further along the perimeter. The area between stations which is crossed by an intruder is determinable from the characteristics of the energy retroreflected by the plurality of partially retroreflective stations.
    • 一种电光周边入侵报警系统,其中来自收发器的准直光能的脉冲光束被顺序地定向到多个部分回射站。 每个站可以具有附加的反射器,用于引导由该站在期望的方向上传输的能量以围绕具有光束或能量束的周界。 中断束的入侵者阻挡脉冲能量,否则这些脉冲能量将沿着周边进一步由任何回射器返回到收发器。 由入侵者穿过的车站之间的区域可以从由多个部分逆向反射站回射的能量的特性来确定。