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How does an infrared thermometer work?
Answered by Discovery Channel
  • Discovery Channel

    Discovery Channel

  1. Infrared thermometers contain a crystal that is sensitive to infrared, or heat radiation. The crystal emits a signal when it detects heat. The strength of the signal determines the temperature that is registered on the thermometer. Infrared thermometers are commonly used to measure body temperature by reading heat that radiates from the eardrum. Bolometers and pyrometers are other types of infrared thermometers.

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