Radiometer for the determination of a temperature of a body by measuring emitted thermal noise
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United States of America Patent
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Apr 21, 1998
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N/A
app pub date -
Aug 21, 1995
filing date -
Aug 19, 1994
priority date (Note) -
Expired
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Abstract
Radiometer for the determination of a temperature of a body by measuring emitted thermal noise and measurement process using this radiometer. The radiometer includes a double radiofrequency signal amplification chain (1) for thermal noises, one of whose branches (2') continuously measures a thermal noise signal generated by a predetermined reference source (3), two converter circuits (5, 5', 6, 6') whose continuous signals are transmitted to a unit (8) for control, processing and evaluation, and means (9, 10, 11) for changing the heterodyne frequency transposition of the radiofrequency signal frequencies of the thermal noise processed in the two branches (2 and 2').
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