IR SENSOR

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What is an IR Sensor?

IR sensor is an electronic device, that emits the light in order to sense some object of the surroundings.

 An IR sensor can measure the heat of an object as well as detects the motion. 

Usually, in the infrared spectrum, all the objects radiate some form of thermal radiation. These types of radiations are invisible to our eyes, but infrared sensor can detect these radiations.

IR sensor

The emitter is simply an IR LED (Light Emitting Diode) and the detector is simply an IR photodiode .

 Photodiode is sensitive to IR light of the same wavelength which is emitted by the IR LED. When IR light falls on the photodiode, the resistances and the output voltages will change in proportion to the magnitude of the IR light received.


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