PORTABLE OPTICAL ALARM SYSTEM FOR AREA PROTECTION

摘要

The portable optical alarm system for area protection contains at least one light emitting transmitter and a receiver sensing the emitted light, wherein transmitters and receivers of the system form a chain in such a manner that the receiver sensing the light impulses of the first transmitter is always connected electrically to the following transmitter and the last receiver of the system is connected electrically partly to the intervening organ partly to the first transmitter of the system, or the first transmitter of the system is formed as a free-running unit; transmitters and receivers can be arranged in an optional mutual arrangement and they are arranged in a casing containing the transmitter circuit and the belonging battery, resp. the receiver circuit and the battery belonging thereto.