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Module 1: Sensor classifications and characteristics

20242m

Which of the following sensors is primarily used to detect the presence of an object without physical contact, often utilizing infrared radiation to measure proximity?
(i) Tactile sensor
(ii) Photodiode
(iii) Collision sensor
(iv) IR proximity sensor

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Answer

Correct Option: (iv) IR proximity sensor

Explanation

IR proximity sensor detects presence without physical contact by emitting infrared radiation and measuring reflected IR intensity / time-of-flight.

  • Tactile sensor → requires contact (force/pressure).
  • Photodiode → detects light intensity, not specifically proximity.
  • Collision sensor → contact/impact detection.

IR proximity (and also ultrasonic) uses IR LED + photodiode pair; distance ∝ reflected intensity.

Final Answer

IR proximity sensor → Option (iv).

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