Hello everyone,
I see in a number of works that an AC resistance is measure as a function of RH% to gauge device performance. I wonder why do they consider AC instead of a DC signal?
Normally, you should measure an impedance (this is for AC) not a resistance (DC).
Impedance is a capacitor parametr (this capactior is your sensor).
Now, when you have a canstant distance between plates of capacitor, capacitance and impedance depends on material between plates.
It can be air. Proportion between air and water decides about epsilon (elecrtical constant). This parameter is exactly readable. Cannot be measured with DC.
Dear Tomasz Zyska , Thank you for your answer, can you please elaborate a bit on this? Are the parallel plates in this case the two metal electrodes?
At first please read this (about 50%):
https://www.machinerylubrication.com/Read/28697/humidity-saturation-limits
Next you will see that we are talking about capacitor. Capacitor is 2 electrodes device. Boh electrodes are plates. Between these plates you are measuring electrical constant.
This constant depends on humidity
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