Up until 1960, radiation thermometers are primarily used to measure high temperatures. However, after that time, various types of radiation detectors that are also receptive to wavelengths larger than 8 µm are developed, enabling reliable and accurate temperature measurement right down to below the freezing point of water.
- 1800 Herschel discovers the IR spectrum through tests with a liquid thermometer with IR-absorbing ball
- 1900 Planckian radiation laws
- 1938 Book “Optical Pyrometer” (measuring technology application)
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