9. Humidity sensors
The different principles are :
strain gage probes (figure 34) where the sensing element acts in tension;
impedance variation probes (figure 35);
dielectric hygrometers (figure 36): measure change in permittivity;
dew point hygrometers (figure 37);
psychrometers (figure 38). They are made up of two thermometers: the dry thermometer and the "wet" thermometer; the difference in temperatures is linked to the water vapour tension in the air;
electrolytic hygrometers (figure...
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Humidity sensors
Temperature sensors
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