Is it possible to measure the relative humidity accurately using a capacitive sensor for a cyclic change in input humidity and temperature (non-isothermal conditions, cycle duration is less than 60s)?
Yes.
A Honeywell HIH-4000 has an equilibration time shorter than that.
And if you want to go all-digital, Sensirion makes a nice line of I2C devices.
https://www.sensirion.com/en/environmental-sensors/humidity-sensors/
And Silicon Labs
http://www.farnell.com/datasheets/2245062.pdf
Resistive-type relative humidity sensors: Resistive-type sensors are composed of interlocked metal electrodes that are deposited on a substrate. The resistance, which is measured by the sensor, decreases as the humidity increases. The advantages of resistive type sensors include being generally accurate in high relative humidities (>95% RH). it is not accurate for HR
Hi Easwaran,
If you want to buy, you may want to see how accurately you want to perform your measurements. Some commercial humidity sensors can measure the relative humidity with a maximum error of 3%, with a fast response, but I'm not sure if the sensor used in the device is a capacitive sensor. You can search for "Sensirion" smart gadget.
If you want to fabricate such device, there are many papers on this topic.
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