Motion sensors are used in the hunting industry for detecting the presence of wild game in a radius around the place where they are placed.
The principle of their operation is based on the observation level of the infrared radiation in the Visual field of the sensor. When a wild animal (or other hard object with a temperature higher than the temperature of the background)passed the sensor issue, called "Pyroelectric sensor" increases tension. In order to determine whether the object is moving and what is its location, the sensor uses the optical system-Fresnel lens.
