normal full-range
operation, Ceilometer CL51 digitally samples the return signal from 0 to 100 µs. The sampling
is repeated every
67 ns, providing a spatial resolution of 10 meters from grounded level up to
15,000 meters. The specified cloud height reporting range is 13 km.
2.2 Vaisala Present Weather Detector
Vaisala Present Weather Detector (PWD22/52) is an optical sensor that measures
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