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Q3 What is "far infrared" ?
How do automatic lights that light up when a person approaches work?
This is an example of a sensor that detects humans. While there are various detection methods, the most effective is the one that detects the infrared rays radiated from the human body.Every object emits infrared energy according to its temparature.
Human beings radiate infrared waves in bandlengths from 7 to 14 microns and through the use of a sensor set to detect this bandwidth, the detection of people is possible. When someone approaches the sensor, the sensor detects the radiation from that person and transmits a signal to the driver section which causes the light to automatically be turned on.
Sensors such as these are also used in applications in the security field.