Infrared radiation

principle · 1800 · Industrial Revolution

Invisible heat radiation (Herschel).

Author: William Herschel.

Where it is used

• Remote control — is used in. An infrared signal.
• Greenhouse effect — is used in. Infrared radiation is trapped.
• Pulse oximeter — is used in. Infrared absorption by haemoglobin.
• Thermal camera — is used in. Heat radiation.
• Motion sensor — is used in. Passive infrared.
• Infrared thermometer — is used in. The infrared radiation of a body.
• Infrared seeker — is used in. The infrared radiation of the target.

What it is a kind of

• Electromagnetic waves — is a kind of. Infrared is electromagnetic waves a little longer than red light; we feel it as warmth.

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