| 摘要 |
This invention concerns a device for the automatic identification of persons and objects crossing infrared ray barriers consisting of a two-way radio slaved to the infrared ray barrier which dialogues with the two-way radios held by persons or fitted on objects authorised to cross the barrier freely. In particular the two-way radio slaved to the barrier transmits a coded impulse whenever the infrared ray beam is interrupted while the two-way radios held by the persons or fitted on the objects crossing the same decode and respond to said impulse for purposes of identification; it being provided that after identification, the two-way radio slaved to the infrared barrier transmits a deactivation signal to the alarm control unit in order to prevent the same from activating an acoustic and/or luminous alarm. |
