Infrared detectors are used in a wide range of applications but include:-
- Non Contact temperature sensing
- Infra red gas analysis
- Flame detection
- Temperature control systems
- Detection of human presence
- Infra red spectroscopy
(The wii remote has in IR sensor)
This sensor maybe what we need to detect where a person is located.
A Passive InfraRed sensor (PIR sensor) is an electronic device which measures infrared light radiating from objects in its field of view. PIRs are often used in the construction of PIR-based motion detectors (see below). Apparent motion is detected when an infrared source with one temperature, such as a human, passes in front of an infrared source with another temperature, such as a wall.
All objects emit what is known as black body radiation. This energy is invisible to the human eye but can be detected by electronic devices designed for such a purpose. The term 'passive' in this instance means the PIR does not emit energy of any type but merely accepts incoming infrared radiation.
Detection of human presence:-Most of us are aware of infra red detectors being used in intruder alarms in our homes and offices. Also the police use infra red imaging to detect and track people in the dark and the fire brigade use infra red cameras to detect the presence of humans in major catastrophes such as collapsed buildings etc.
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