Design of Teaching Experiment of Relative Humidity Measurement

The knowledge points of humidity, wet air, measurement, calibration and other knowledge points in courses were deeply integrated in this experimental teaching project. The principle of the change of resistance value of humidity sensor in the process of moisture absorption or dehumidification were using. The humidity sensitive material is polymer nanocomposite. An electronic hygrometer is designed based on partial voltage and amplification circuit, which can detect the voltage value under different relative humidity to verify the linear relationship between voltage value and relative humidity. The training content of the experimental project is highly comprehensive and moderate in difficulty. It covers the knowledge of measurement, the basic thermal quantities, electricians and electronics, and practical operation which is helpful to cultivate students’ comprehensive abilities such as innovation.