A novel marine meteorological elements relative humidity sensor is proposed so as to deal with the problem that the land meteorological elements relative humidity sensor can be applied in the marine environment. In order to measure the relative air humidity

a frequency generation circuit based on high precision probe of air humidity and the timer IC is designed.Both a frequency to electric voltage（F / V） transfer circuit and a linearization regulation circuit are designed.The developed circuits realize the linearly transfer from air relative humidity to electric voltage.Through special sensor structure and reliability design

the compatibility of the proposed sensor to the marine environment is realized by special structure and reliability design.The test results show that the proposed marine meteorological elements relative humidity sensor has the characteristics of high precision and good linearity

and can be applied in the marine environment.