Macromolecule capacitive humidity sensor structure circuit

Published:2011/6/27 6:45:00 Author:Christina | Keyword: Macromolecule, capacitive, humidity sensor, structure circuit | From:SeekIC

The macromolecule capacitive humidity sensor structure circuit is as shown in the figure. This kind of humidity sensor is a capacitor, the electrode of the macromolecule film is a layer of very thin metal micropore evaporation film, the water molecules can be adsorbed or released by the macromolecule film through the electrodes of two ends, this makes the macromolecule film dielectric constant change. Because the dielectric constant changes with the relative air humidity, so we can get the relative humidity value by measuring the value of capacitance C. The capacitance value of the humidity sensitive component can be confirmed by the formula of Ｃ＝εS/d.



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