Lecture
This lecture covers the principles of capacitive humidity sensors, focusing on the relationship between capacitance and relative humidity. It explains the use of hygroscopic polymers with metal electrodes to measure absolute humidity and relative humidity. The lecture also discusses the Philips HI capacitive hygrometer datasheet, linearity, sensitivity, and applications in comfort, air conditioning, and industrial processes. Additionally, it explores the dew point hygrometer, optical balance, and the principle of measuring dew point temperature. The lecture concludes with examples of capacitive proximity sensors and electrode arrangements for capacitive sensors.