Research on Dew or Frost Point Temperature Measurement for Upper-air Radiosonde

Cryogenic dew or frost point hygrometer can provide a wide dynamic range and precision in measurement of water vapor contain for upper-air radiosonde. So this instrument can make the humidity measurement accuracy and be used as climate and scientific research observation device. Since the upper-air operation, the device small size requirement is first consider. Dew or frost point temperature measurement is important for calculation of water vapor contain in the atmospheric. Two things are done in this measurement, one is detecting dew or frost has been condensate, another is measuring the temperature by sensor. The first thing employs TEC to cooling and heating a mirror for dew or frost condensate, and detecting this process by light sensor. The second thing employs some convertor collect the sensor data. MCU is used as controller calculator for measurement processes. Experiments show that dew or frost temperature measurement is accuracy in real time.