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Types of Infrared Sensors

Types of IR Sensors

Infrared sensors can be classified into passive or active infrared sensors.

1) Passive infrared sensor

These are IR sensors which do not have an infrared source but detects energy emitted by obstacles. They are of two types namely:
  • Thermal infrared sensor: use infrared energy as a source of heat and are independent of wavelength.
  • Quantum infrared sensor: The photo-sensitivity of quantum type detectors is dependent on the wavelength and are perform better than thermal infrared sensors.
Passive infrared sensor
Passive infrared sensor

2) Active infrared sensors

These are IR sensors which contains an infrared source and infrared detector. The infrared source is an IR LED and the receiver can be a photodiodes or a phototransistors.
These sensors can be used in object sensing, obstacle avoidance robot, motion detectors, measurement of distance, smoke detection etc.


The figure below show a typical photodiode infrared sensor.
types of infrared sensors
A typical infrared sensor

Related:

 Ref:


Olome Baudouin E. "Design and realization of an automatic industrial sorting machine", University of Bamenda, July 2019.

Working principles and applications of infrared sensors, Htttp://en.m.wikipedia.org,


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Location: Lagos, Nigeria

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