Questions · Intruder detection
Why does my alarm go off when there is nobody there?
Because of four groups of causes, and in most installations the commonest is the first: people. Somebody comes in out of hours, the cleaners arrive earlier than expected, an employee gets the code wrong, a door is left badly shut when setting and the system sets anyway because nobody looked at the message on the keypad.
Then there are the mounting ones: a detector facing a metal gate that cools at dusk, a microwave going through a light partition, an infrared facing a hot air outlet, a misaligned barrier, a contact on a door that moves in the wind. Then the environmental ones: animals, insects and cobwebs on the lens, rodents, vegetation that grows, tarpaulins and signs that move. And finally the real faults: a flat battery, a power supply that no longer delivers, a detector at the end of its life.
Of everything we have gone out to sort out since 2006, most were in the first two groups and not down to the make of the detector. And the commonest cause in the third has a cheap fix: a cobweb in front of a lens is a warm body centimetres from the sensor, and cleaning the detectors is part of the maintenance, not an extra.
Where it is set out in full.
Where you can see it working.
On the IRIS Neural website, on real scenes.
On the same topic.
All the questions.
Five hundred and forty-four, grouped by topic. Each with its own page.
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See it working.
A written answer is enough to decide whether it interests you. To know whether it works at your site you have to see it on a real scene, with the image as it is and, on top of it, what the system understands from it. That is on the IRIS Neural website, which is the group's product.