Perimeter IDS On Security Fence

In high security installations (e.g. nuclear facilities) generally it is possible to find no.3 levels of fence: the outermost, the median and the innermost.

In this case on the median it is installed the PIDS, while the outermost has the function to avoid that debris, small animals and other interferences can raise false and nuisance alarms, and the innermost is the delay element for the intruder, once detection is accomplished.

Also, between the median and the innermost are installed other sensors (e.g. microwave barriers), that have the function to confirm or not the intrusion attempt.

But what about when you have only no.2 levels of fence?

you can apply the PIDS on the outermost, and in this case you will have the innermost as the delay element, but with good probability you will have a raising in false and nuisance alarms, due to the missing function seen before ( to avoid that debris, small animals and other interferences)

- OR -

you can apply the PIDS on the innermost, with the outermost having the the function to avoid that debris, small animals and other interferences can raise false and nuisance alarms, but you will loose the delay function of the fence behind (from outside to inside) the one where the PIDS is applied.

where would you apply your PIDS having only no.2 levels of fence?

thank you for share your thoughts