A note on temperature and relative humidity corrections for humidity sensors

A widely used relative humidity (RH) sensor in atmospheric science is based upon a capacitive device that outputs voltage as a linear function of RH a nd then is corrected by an empirically determined polynomial expression, wh ich is only a function of temperature. Based upon results of a dry bias in these measurements and upon a recent physical-mathematical model of how the se devices may work, a new correction formula is derived, which is a functi on of temperature and RH. The new formula reproduces the old one near 40% R H and corrects the dry bias for RH values less than 40%.