| 摘要 |
A circuit for an infrared intrusion detector comprising a plurality of receiving directions or regions which are separated from one another and a radiation receiver, at the output of which there appears an electrical signal corresponding to the infrared radiation which is absorbed by all of the receiving directions or regions. The circuit is structured such that an alarm signal is delivered when the received infrared radiation both ascends in a predetermined manner as well as descends in a predetermined manner within a given delay time.
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