SKYDEW
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The
SKYDEW is a Peltier-based digitally-controlled chilled-mirror hygrometer to
measure atmospheric water vapor accurately. When the chilled mirror hygrometer
maintain thin dew/frost layer constantly, the mirror temperature is equal to
the dew/frost point temperature in ambient air. The mirror is cooled by
two-stage Peltier device, with PID controller.
The chilled-mirror hygrometer is mainly used for the three purposes;
(1) validation for the operational radiosonde RH sensor and satellite measurements for water vapor as reference sensor;
(2) monitoring the climate (long-term variability in atmospheric water vapor);
(3) studies for at upper troposphere
and around tropopause.
The
SKYDEW is environmentally-friendly and ease-to-handle in nature because this
instrument does not use a cryogenic material to cool the mirror. The SKYDEW can
measure atmospheric water vapor up without cryogen material.
The data format of SKYDEW is according to the XDATA radiosonde protocol. Therefore, SKYDEW can connect the several types of radiosonde in addition with Meisei radiosonde RS-11G.