INFRARED (IR) SENSOR
Infrared (IR) radiation was first discovered by an astronomer named William Herchel in 1800. When he was measuring the temperature of each color of light (separated by a prism), he noticed that the temperature just beyond the red light was highest .As IR is invisible to the human eye, since its wavelength is longer than that of visible light therefore by observing this phenomenon he discovered infrared light. Basically, t here are two types of infra red (IR) sensors: · Active · P assive. Active Infrared (IR) sensor It perform both the phenomenon i.e. emit ting and detect ing infrared radiation. Active IR sensors have two parts: · light emitting diode (LED) · Receiver An infrared (IR) sensor is an electronic device that measu...
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