METHOD FOR IMPROVING THE PRECISION OF IMPEDANCE SENSORS IN RADIOSONDES.

摘要

Method in improving of the precision of impedance detectors in radiosondes. In the method, the temperature of the detector or detectors (30 and/or 10) is measured by means of a thermocouple (20), in which the joint (23) of one branch of its thermoelements (21,22) is placed in connection with, or at the proximity of, the detector to be measured. In the thermocouple (20) the joint (24) of the other branch is placed in the atmosphere (SA) surrounding the detector. By means of the thermocouple (20), the difference (T1-T0) between the temperature (T1) prevailing in connection with the detector and the temperature (T0) in the surrounding atmosphere (SA) is detected. The output signal (fout) of the measurement coupling of the radiosonde is affected by means of an electric signal (U(t)) representing the difference (T1-T0) in temperature, which output signal contains the data concerning the meteorological quantity or quantities measured by means of the detector (30) or detectors (10,30). The DC voltage (Uo) obtained from the thermocouple (20) is converted by means of an inverter (60) or equivalent into an AC voltage (U(t)), by means of which the output signal (fout) of the measurement coupling is affected.