Protecting a building or a property with fences, barbed wire and closed-circuit cameras may be really expensive, but a recent invention coming from Tel Aviv University might revolutionize environmental surveillance and security.
The Smart Dew sensors, smaller than a coin, can be scattered at random all around the area that needs to be monitored, in a practically invisible fashion, and each one of them has a range of approximately 50 meters, which guarantees a total security.
Each one of these sensors is equipped with a miniature radio transceiver, and they can be interconnected within a wireless network, setting up their sensitivity level in order to be able to recognize the different kinds of intrusions they might face (a human, a vehicle or an animal), as well as changes in temperature, carbon monoxide emissions or changes in light and vibrations.
They can also be equipped with highly sensitive miniature microphones, capable of picking up sounds coming from an intruder, or magnetic sensors which would detect the presence of a car within their range by its metal. Each sensor is communicating via radio with a base station which collects and analyzes the data received.
Thanks to their extremely tiny size, which makes them practically invisible especially when strategically placed under a rock or on a lawn, and to the possibility of using hundreds of sensor to monitor the area, finding them all would really be a mission impossible.
Also, at the cost of only 25 cents per sensor, and because of the very low operational cost of a bug which uses low-frequency radio signal, this system could be an interesting alternative to the traditional covert listening devices, suitable for being used in large properties, airport areas or even in border zones where constant surveillance would be impractical.