How your WiFi can protect against intruders | ScienceNordic

How your WiFi can protect against intruders | ScienceNordic:
...use WiFi Internet for very different purposes: 
To identify and track the movement of people within a building covered by a wireless network. 
It’s a high tech surveillance system that not even The Night Fox of Ocean’s Twelve could capoeira his way out of without triggering the alarm.
A new generation of security monitoring

These applications could lead to a new generation of security or monitoring systems for detecting physical intrusion by humans in your home or workplace, using only the radio frequency (RF) signals of your wireless network.

In some cases, this could avoid the cost of physically mounting traditional burglar alarm systems, such as the widely used Passive InfraRed (PIR) sensors, ultra-sound sensors, door contacts, motion detectors, or glass break detectors.

...A simple security system

Consider a classic PIR based surveillance system, where the PIR unit is divided into two parts: An infrared sensor and a wireless communication part.

The PIR is physically mounted in a room and communicates, typically via WiFi, with the main alarm system elsewhere in the house.

When an intruder enters the room, the PIR sensor measures the heat radiation from that person and converts these measurements to a digital signal, which is then communicated through the wireless network to the main alarm unit. If the changes in heat radiation are sufficient then the alarm is sounded..."

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