Dew point measurement based on the sensitive circuit

According to the problem of atmospheric humidity measurements, the dew point measurement method was proposed based on the sensitive circuit. The quartz crystal as a humidity sensor, when water condensation produced by the Peltier cooling appears on the quartz crystal, the test circuit will stop the vibration. Use this characteristics of colpitts oscillator distinguish the dew point and can get the dew point temperature. The measurement results with the proposed method were compared with the actual data. Though some measurement error was yielded, it is proved that the proposed method is useful for measuring the dew point of moist air and it has some advantages such as simple, high sensitivity, good reliability and low cost.