4. Cryogenic radiometer: primary thermal detector
A cryogenic radiometer is a cryogenic electrical substitution radiometer, which is cooled to very low temperatures using liquid helium. An electrical substitution radiometer is in fact a thermal detector that enables absolute measurements to be made of the power of optical radiation, by comparing it with an equivalent electrical power.
4.1 Thermal detectors
The operating principle of a thermal detector is shown in figure...
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Cryogenic radiometer: primary thermal detector
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