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Module 1: Sensor classifications and characteristics

20242m

An IR sensor that only detects IR radiation but does not emit is called:
(i) Active IR sensor
(ii) Passive IR sensor
(iii) Both a and b
(iv) Resistive IR sensor

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Answer

Correct Option: (ii) Passive IR sensor

Explanation

  • Active IR: Has emitter (IR LED) + detector (photodiode). Emits IR, measures reflection (proximity, distance).
  • Passive IR (PIR): Only detector, no emitter. Detects IR radiation emitted by objects (human body ~9-10 µm). Used in motion detection, security.

Resistive IR not standard term.

Final Answer

Passive IR → Option (ii).

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