-
sures cloud height and vertical visibility while Vaisala Present Weather Detector measures visi-
bility, precipitation intensity and precipitation type.
2.1 Vaisala Ceilometer (CL51)
The Vaisala Ceilometer CL51 measures cloud height and vertical visibility. It employs pulsed
diode
laser LIDAR technology, where
laser pulses are sent out in a vertical or near vertical
direction. The reflected light
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