Radiometer for determining the temperature of a body by measurement of the emitted thermal noise, and measuring method, the used this radiometer

摘要

The present invention relates to a radiometer for the determination of a temperature of a body, by measurement of the thermal noise emitted and a measurement process employing the radiometer. & br / radiometer characterized in that it is essentially constituted by a double chain (1) of an amplification of the radio frequency signals of the thermal noise, one of the arms (2 ') continuously measuring a signal of the thermal noise generated by a source of reference (3) determined on the other hand, by two sets of converter circuits (5, 5 ′, 6, 6 ′) in which the d.c. signals are transmitted to a control unit (8), processing and evaluation, and, finally, by means (9, 10, 11) of change of the modulating frequency transposing the frequencies of the radio frequency signals of the thermal noise treated in the two branches (2 and 2 ′).